Catiav5r7 Assembly Design Book

CATIA Assembly Design

CATIA® V5R6

TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 CATIA Version 5 Assembly Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Assembly Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pull Down Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Analyze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Assembly Design Workbench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Inserting Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Replacing and Creating New Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Reordering and Numbering the tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bill of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Constraining and Manipulating Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Bounding Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Coincidence Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Contact Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Snap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Defining a Multi Instantiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Smart Move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Modifying a part to create a new part while in the assembly . . . . . . . . . . . . . . . . . . 42 Fast Multi Instantiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Fix Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Offset Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Copying and Pasting with constraints Note: You need to make sure that your Paste components option Always with the assembly constraints is turned on under pull down menu Tools, Options, Mechanical Design, Assembly Design, Constraints tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Angle Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Explode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Advanced Constraint Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Fix Together Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Quick Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Changing a Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Reusing Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Weld Planner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Activating/Deactivating constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 External References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Assembly Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Hole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Add . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Remove . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

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Table of Contents, Page i

CATIA Assembly Design

CATIA® V5R6

DMU Fitting Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Pull down menu changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Analyze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 DMU Fitting Simulation Workbench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 Bottom Toolbar Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 DMU Viewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Creating a simple simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Creating a shuttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Creating a simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Compiling a simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 Replaying a compiled simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Multiple Objects moving in same simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 Creating a group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 Moving two shuttles at once . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 General methods and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Exploding the assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Moving the shuttle axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Creating a shuttle referencing a shuttle . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 Customizing automatic insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Simulating shuttles referencing a shuttle . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Distance and band analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 Swept Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Simulating assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 Exploding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 Current selection panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 Creating groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 Creating shuttles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 Creating the simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Creating a replay and an AVI file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Checking for clash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 Clash detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 Path finder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Smooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 DMU Navigator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 Pull down menu changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 Insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 DMU Navigator workbench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 Creating an annotated view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Creating a scene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Publish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Creating an annotated view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 Publish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 Table of Contents, Page ii

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CATIA Assembly Design

CATIA® V5R6

Hyperlinks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 3D Annotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Scenes - basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 Search . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Current selection panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 Proximity query . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Translation or rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 Scenes - advanced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 Fly mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 Viewpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Practice Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 Sawhorse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 Puzzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 Mouse Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 Hard Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Pen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 NIAR Third Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 Robotic Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

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Table of Contents, Page iii

CATIA Assembly Design

Table of Contents, Page iv

CATIA® V5R6

©Wichita State University

CATIA Assembly Design

CATIA® V5R6

Introduction CATIA Version 5 Assembly Design Upon completion of this course the student should have a full understanding of the following topics: -

Inserting models into an assembly

-

Manipulating models in an assembly

-

Constraining models in an assembly

-

Using advanced methods to insert and constrain assemblies

-

Analyzing assemblies for clashes and gaps

-

Modifying assembly components and updating assemblies

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Assembly Design - Introduction, Page 1

CATIA Assembly Design

CATIA® V5R6

Assembly Design Very few finished designs are a single part. Usually a finished design consists of several to millions of individual parts to define them. This is where CATIA V5 assembly design is utilized. Assembly design allows parts and small assemblies of parts to be inserted to make larger, more complete products. In CATIA V5 Part Design and Sketcher, you learned how to generate parts. The primary objective of this class is to utilize those parts to create a complex assembly of those parts that can be later used in stress analysis, kinematics, fitting simulations, and other areas. It is important to understand some of the terminology that CATIA uses when working with assemblies. There are basically three types of documents that are used in assembly design. They are the overall assembly, sub-assemblies and individual models. CATIA uses the word products to refer to assemblies and parts to refer to individual models. You can use parts to create products and then in turn use those products to produce other products. The diagram shown below represents the concept of the overall structure.

The first product at the top is generally regarded as the assembly, whereas the two products that are underneath are generally regarded as sub-assemblies of this assembly. This assembly could in turn be used to create an even bigger assembly at some other time, or the sub-assemblies could be used as sub-assemblies of a different assembly. With this concept in mind be aware that an assembly could be a very complex document due to its ability to have multiple levels of sub-assemblies and parts. Because of this complexity it is important that you have a plan of attack when building assemblies. There are basically two approaches that a user or company can take when building assemblies. One is to predetermine what sub-assemblies a particular assembly is going to need. The other is to produce all of the parts and then determine what sub-assemblies are going to be created.

Assembly Design - Introduction, Page 2

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CATIA Assembly Design

CATIA® V5R6

Pull Down Menus

Not all of the options will be covered since you should of already been introduced to them through previous courses. Only the new options that appear when you are in the assembly design workbench will be discussed. Edit

Move

Component Constraints

Various methods of moving your components around in the assembly

Allows you to select constraints that are linked to the component

Components

Allows for components within the assembly to be replaced, turned on or off, reordered or changed from being Flexible or Rigid

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Assembly Design - Introduction, Page 3

CATIA Assembly Design Representations

Assembly Design - Introduction, Page 4

CATIA® V5R6

Allows for the representation of the assembly to be changed

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CATIA Assembly Design

CATIA® V5R6

Insert

Coincidence

Inserts a coincidence constraint

Contact

Inserts a contact constraint

Offset

Inserts an offset constraint

Angle

Inserts an angle constraint

Fix Together

Fixes two components together

Fix

Fixes a component in space

Quick Constraint

Applies a quick constraint to components

Reuse Pattern

Apples a pre-defined pattern to a component

New Component

Allows the insertion of parts as details

New Product

Inserts a new assembly into the product

New CDM Component

Inserts a new CDM component

New Part

Inserts a new part into the assembly

Existing Component

Inserts an existing component

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Assembly Design - Introduction, Page 5

CATIA Assembly Design

CATIA® V5R6

Fast Multi Instantiation

Applies a Fast Multi Instantiation of a component

Define Multi Instantiation

Defines a Multi Instantiation of a component

Weld Planner

Places weld symbols into the assembly

Annotations

Assembly Features

Assembly Design - Introduction, Page 6

Adds text with a leader or a flag note with a leader to your assembly

Performs an operation on your assembly

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CATIA Assembly Design

CATIA® V5R6

Tools

Product Management

Allows the part number, and representation to be changed for a component

Publication Management

Allows the publication of components and elements to be modified

Catalog Browser

Access part catalogs for standard parts such as bolts, nuts, fasteners, etc.

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Assembly Design - Introduction, Page 7

CATIA Assembly Design

CATIA® V5R6

Analyze

Bill Of Material

Generates a bill of materials from the assembly

Update

Updates the assembly

Constraints

Displays a constraint analysis window of all the constraints in the assembly

Dependencies

Displays a tree format of all the constraint dependencies of a selected component

Mechanical Structure Shows the structure as the assembly sees it, this pertains to having sub-assemblies either as flexible or rigid Compute Clash

Displays a Clash / Clearance computation window

Note: These are available in Part Design but they just appear in the bottom toolbar instead of a pull down menu. Measure Item

Allows you to measure a single element

Measure Between

Allows you to measure between elements

Measure Inertia

Allows you to compute an inertial analysis

Assembly Design - Introduction, Page 8

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CATIA Assembly Design

CATIA® V5R6

Assembly Design Workbench Changes workbenches

Apply a contact constraint

Selects geometry

Apply a offset constraint

Inserts a new component

Apply an angle constraint

Inserts a new product

Fixes a component

Inserts a new part

Fixes two components together

Inserts a existing component

Applies a quick constraint

Replaces a component

Flexible/rigid toggle

Allows the tree to be reordered

Changes a constraint

Generates numbers

Reuses a pattern used in a part

Loads and unloads components

Creates welding symbols

Manage representations

Creates text with leader

Apply a multi instantiation

Creates a flag note

Define a multi instantiation

Splits an assembly

Manipulate the parts

Creates a hole in the assembly

Snap parts together

Creates a pocket in the assembly

Smart move

Performs an add operation

Explode the assembly

Performs a remove operation

Apply a coincidence constraint

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Assembly Design - Introduction, Page 9

CATIA Assembly Design

CATIA® V5R6

This page is intentionally left blank.

Assembly Design - Introduction, Page 10

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CATIA Assembly Design

CATIA® V5R6

Assembly Design The first section of this manual will involve inserting, creating, and replacing documents and other components in the assembly design. Those documents can be a variety of things including parts and other assemblies. Inserting Documents All of the assemblies created in this first section will not need to have constraints added to properly position them. The first assembly that will be built is a basic hand drill.

This drill is made of the following parts. The caption under each picture is the filename so the parts can be referenced to as needed.

Handle Knob Case 1

Handle Arm © Wichita State University

Drive Gear

Assembly Design - Inserting documents, Page 11

CATIA Assembly Design

CATIA® V5R6

Drill Chuck 1

Output Gear Drill Bit 1 Start a new product document. This can be accomplished by selecting the new icon and selecting product. You need to make sure you are in the assembly design workbench before continuing. To switch to the assembly design workbench select the change workbench icon and then select assembly design. One of the most important ideas to keep in mind with assembly design is that all parts must have an unique id. The assembly should also have an unique id, especially if it is going to be used as a sub-assembly. Press button 3 on the mouse while on Product1. This will bring up the contextual menu for Product1. Select Properties and then the Product Tab. This is where various information about the assembly, as well as individual parts can be stored. Filling in all of the information is not necessary, but can become quite useful to a down stream user. For now, the Part Number is the only field that will be changed, but feel free to fill in any of the other fields.

Assembly Design - Inserting documents, Page 12

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CATIA Assembly Design

CATIA® V5R6

Change the Part Number to Hand Drill. Select OK when done. This will give the assembly an unique id, so that in case this was to be used in a larger assembly, say a garage mock-up, then there would be no conflicts. Select the existing component icon. The icon will highlight and is awaiting for the user to select a product to insert the component into. Select Hand Drill. This will define what product the component will be placed into. An Insert an Existing Component dialog box will display. This will look and feel very similar to the Open Document dialog box. Double Select the Hand Drill folder and select Case 1. In this class moving in and out of the different folders will be essential. If you have difficulty with moving in and around various folders, practice will be needed to ease the difficulty of this class. Select Open. The first case is now inserted into the hand drill product. The other components will be inserted to complete the assembly.

Select the existing component icon, and select Hand Drill. The Insert an Existing Component window will automatically open to the Hand Drill folder. Select Drive Gear, and select Open. The drive gear is inserted into the assembly, prepositioned. If so desired, the case can be hidden to reveal the drive gear better. Be sure to have all parts shown before continuing. Notice some of the components can be made into a sub-assembly. For example, the output gear and drill chuck can be combined together. This can either be done before hand, as with the handle assembly that you are going to insert later, or the sub-assemblies can be generated on-the-fly as you will do next. Select the new product icon, and select Hand Drill. into the assembly. A Part Number window appears.

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This will insert a new product

Assembly Design - Inserting documents, Page 13

CATIA Assembly Design

CATIA® V5R6

A part number must be assigned to the new product. Part numbers can either be generated by the computer or generated on-the-fly. The option to change how new product part numbers are generated is under Tools, Options, Infrastructure, Product Structure, Product Structure tab, and Part Number Manual Input. Your system is set up for manual input of the part number. To insure your ability to distinguish between the different products, you will name this one Output Assembly. Key Output Assembly in the Part Number window and select OK. This will change the instance name, allowing for better model management. Now that you have a nested product assembly, a product within a product, you need to make sure that you insert new and existing components into the proper product. Select the existing component icon, and select Output Assembly. Again, the Insert an Existing Component window displays. This time you will insert multiple components at the same time. Select Output Gear, hold down CTRL on the keyboard, and select Drill Chuck 1, then select Open. This will insert both documents into the Output Assembly product. You can expand the Output Assembly product to reveal this by selecting on the plus sign next to it. The handle assembly is already put together as a separate product. You will insert this next. Insert an existing component into Hand Drill. The insert window will show again. Select Handle Assembly and then Open. This inserts the Handle Assembly into the Hand Drill assembly. You can expand this sub-assembly by selecting the plus sign next to it. Insert Drill Bit 1 into the Hand Drill assembly. This completes the Hand Drill assembly. The specification tree should appear similar to the diagram shown below.

Assembly Design - Inserting documents, Page 14

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CATIA Assembly Design

CATIA® V5R6

This is how CATIA represents your assemblies. It is structured in the same way it was explained earlier except in a tree form instead of a chart form as shown below.

Congratulations. This completes your first assembly. Now would be a good time to save your document. When you save your document the following window should appear:

It gives you this message because the new assembly that you created, Output Assembly, was never saved separately. If you select OK then both the Hand Drill and the Output Assembly will be saved. You will want to go ahead and press OK. No constraints have been placed on this assembly, therefore all the parts are completely free to move. Since all of the parts were created in the correct positions they inserted in the correct placement. Many times the models will not insert into the proper place and will need constraints to position them properly. You will learn how to constrain parts later in this course.

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Assembly Design - Inserting documents, Page 15

CATIA Assembly Design

CATIA® V5R6

Replacing and Creating New Parts This exercise will be a continuation of the previous exercise. If the document is not already opened, it will need to be opened before beginning this exercise. In many instances it is necessary to change a part of an assembly because of optional designs that could be used with that assembly. This exercise will covers how to replace components with other components without having to recreate the entire assembly. In the case of the hand drill there are multiple options that are available such as a different case, drill chuck and drill bit that could be used on this assembly. Instead of creating a new assembly for every option, you will learn how to replace each component in order to show the different options of the design. Select the replace component icon and select Case. This brings up the Replace a Component dialog box, same as the Open dialog box. Case will be replaced with Case 2. Select Case 2 and then Open. This will replace Case with Ergo Case. Any component, or product can be replaced in the same fashion. You will replace other components next. Expand the Output Assembly if it is not already expanded. Remember you can do this by selecting the plus sign to the left of the assembly. Replace the Drill Chuck with Drill Chuck 2. This will replace Drill Chuck with Large Chuck. The new drill chuck displays. Replace the Drill Bit with Drill Bit 2. This will replace Drill Bit with Large Drill Bit. Notice the drill bit should really be included with the Output Assembly. Select and hold the first mouse button on the Large Drill Bit and drag it to the Output Assembly and release the button. This should move the drill bit to the sub-assembly, however it may copy it instead. If it does then just undo the operation and try it again. Working with sub-assemblies is an excellent way to manage models and the respective components.

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CATIA Assembly Design

CATIA® V5R6

Next a wall mount will be created within the assembly. Creating new parts within the assembly is the same as when a new product was created within the assembly. First, a part number will need to be specified, then an origin. Select the new part icon and then select Hand Drill. This will insert a new part into the Hand Drill assembly or product. As mentioned before you will have to specify a part number for the new part. Key Wall Mount in the Part Number window and select OK. This will denote the part number of the new part to be Wall Mount and it should appear in your specification tree. Next, the origin must be specified.

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Assembly Design - Replacing and Creating, Page 17

CATIA Assembly Design

CATIA® V5R6

A New Part: Origin Point window appears asking where the origin is to be located.

Selecting Yes will allow you to define a new origin point for the new part. Selecting No will use the origin of the assembly as the origin of the new part. Select No. This will define the origin of the new part to be the same as that of the assembly. You will now create the wall mount. None of the other components will be used to design the wall mount, although later in this course they will be necessary. It is advisable that all of the components be hidden, with the exception of the Wall Mount, and possibly the Ergo Case for orientation purposes. This can be accomplished by selecting the components and then using the third mouse button choose Hide/Show, or by selecting the components and then select the Hide/Show icon in the bottom toolbar. Expand the Wall Mount component until PartBody is accessible. This can be accomplished by selecting the plus (+) next to the component and part icons.

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CATIA Assembly Design

CATIA® V5R6

Double select PartBody with the first mouse button. This will insert you into the Part Design workbench. You can now build the necessary geometry for the wall mount. Create the wall mount. Drawings are shown below with the location of the mount in relation to the axes. It is suggested that you use the yz plane for the sketch of the initial pad.

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Assembly Design - Replacing and Creating, Page 19

CATIA Assembly Design

CATIA® V5R6

Double select Hand Drill. This will return you to the Assembly Design workbench. Collapse the Wall Mount branch and show all of the components to look at the final design. It should look like the following. Be sure to save your document.

Assembly Design - Replacing and Creating, Page 20

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CATIA Assembly Design

CATIA® V5R6

Reordering and Numbering the tree With the assembly complete, you will look at two other options for assembly management. Select the graph tree reordering icon. This will allow you to reorder the tree. Since the components are not related to each other in terms of order of creation, as in part design, they can be reordered at will. Select Hand Drill. The Graph tree reordering window should appear. Notice that only the parts and sub-assemblies appear that are under the Hand Drill assembly and not the parts that make up the sub-assemblies. If you want to reorder the components of the subassemblies, you can either reorder them while having the particular sub-assembly opened or you can select that sub-assembly instead of selecting Hand Drill.

The up and down arrows allow the highlighted part to be moved higher or lower in the tree respectively. The third icon moves the selected part to another selected location. This could be useful to help organize a large assembly by reordering components to be listed together in the specification tree. In any case it is nice to know that you do not have to insert all of your components in a specific order, you can always reorder them later. Move the Ergo Case to the bottom of the tree and select Apply when done. This can be done by selecting the Ergo Case and then selecting the down arrow until it is on the bottom of the list. The tree will be reordered when Apply is selected. As you can see it is fairly simple to reorder components of the assembly. If you have a large number of components it may be better to use the third icon to position the component at a particular location without having to select the up or down arrows multiple times. Using the third icon move Drive Gear to the location Handle Assembly. Notice that Drive Gear appears after Handle Assembly now.

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Assembly Design - Reordering & Numbering, Page 21

CATIA Assembly Design

CATIA® V5R6

Select OK. Remember you have to select Apply or OK in order for the reorder to take affect. Next, you will generate numbering for the assembly. Select the generate numbering icon. Generating numbers shows no visual change in the assembly. It assigns numbers or letters to the parts within the assembly. They in turn show up in the bill of material when it is generated as well as in detail call outs in drafting. Select Hand Drill. The Generate Numbering window appears.

The Mode determines whether you are assigning integers or letters to the parts within the assembly. Existing numbers will allow you to keep numbers that have already been assigned or you can replace them. In this case you have not assigned any numbers therefore the options are not available. Select OK. Numbers are now assigned to all the individual parts of the hand drill.

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CATIA Assembly Design

CATIA® V5R6

Bill of Material You will now create a bill of material. Although for this case it is somewhat unnecessary since the assembly is fairly small, it will give you an idea on how to create a bill of material for much larger assemblies. Select pull down menu Analyze, then select Bill of Material... The Bill of Material window should appear.

The top section of the bill of material displays all of the parts and sub-assemblies of the current assembly, in this case Hand Drill. It also shows separate bill of materials for each sub-assembly. Notice the nomenclature and revision field. If you would have filled in those fields for each of the parts, as well as the sub-assemblies, they would have been displayed here. The bottom section of the bill of material displays all of the parts that make up the current assembly, as well as the quantity needed for each. The format of the output can be changed with the Define formats button, but usually these formats will be pre-defined by the company. The Listing Report tab shows the same information, but in a different format.

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Assembly Design - Bill of Material, Page 23

CATIA Assembly Design

CATIA® V5R6

Select the Listing Report tab. This will show the listing report for a bill of material.

,

Hides properties either the ones selected or all of them

,

Shows properties either the ones selected or all of them Changes the order of the displayed properties

This report shows the locations of the parts within the tree. 2 Large Chuck denotes the Large Chuck that is located two levels deep. All of the properties within the Hidden properties can be added to the display. Select Number from the Hidden properties field, then select the show properties icon. This will add the number property to the displayed properties. Add any other fields that you would like to see in the listing report.

Assembly Design - Bill of Material, Page 24

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CATIA Assembly Design

CATIA® V5R6

Select the Refresh button. The additional fields were added to the report listing. An example is shown below.

Any report generated can be saved in a text format by selecting the Save As... button. Select the Bill of Material tab. This will take you back to the original bill of material. Select the Save As button and save the text file as bill of material. Select OK. This will complete the bill of material. Bills of material can be created at any point in the assembly design process and regenerated as necessary. After saving the files, it can then be imported into multiple types of word processors.

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Assembly Design - Bill of Material, Page 25

CATIA Assembly Design

CATIA® V5R6

If you were to open the text file using NOTEPAD then it would look similar to the following diagram.

This completes the hand drill assembly. Be sure to save your model before continuing.

Assembly Design - Bill of Material, Page 26

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CATIA Assembly Design

CATIA® V5R6

Constraining and Manipulating Parts In the previous exercise, the parts were pre-positioned, with no constraints necessary. This is usually not the case. This exercise will demonstrate how to constrain a model to position parts correctly through the use of various constraints. The constraint options are as follows: Coincidence

Defines two parts coincident but not attached

Contact

Defines two parts as being in contact

Offset

Defines a distance between two parallel parts

Angle

Defines an angle between two parts

Fix

Defines a part that is fixed, does not move

Fix Together Defines two parts that are attached together that will not move without the other, as in welded parts The first assembly will be a pair of bolt cutters. The completed assembly is as shown, with the filenames pointing to the parts. All of the parts are pre-built with uniquely defined part numbers except for the .75 Bolt.

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Assembly Design - Constrain & Manipulate, Page 27

CATIA Assembly Design

CATIA® V5R6

As a rule-of-thumb, any parts that are connected together and will not be moving without each other, for example the hand grip and the handle will never be moved separately, it is usually a good idea to put them into a sub-assembly. But, whereas the two jaws of the head will move independently of each other, it is not advisable to put them into a sub assembly. Note: All documents are contained within the Bolt Cutters folder. Start a new assembly design document. You should close all other documents and then start a new product. Make sure you are in the assembly workbench before continuing. It is a good idea at this point to give the assembly a good part number. Using the third mouse button select on Product1 and then select Properties. This will bring up the properties for that product. Switch to the Product tab, change the Part Number to Handle Assembly and select OK. This will give the unique id of Handle Assembly to this product. Save your document. Notice the name is automatically chosen as the file name. Be sure to add your initials to the name of the document though. Insert the Handle into the assembly. This can be done the same way you did it in the previous section. Select the existing component icon and then select the Handle Assembly product. Then you can choose the Handle part to insert into the assembly. Insert the Hand Grip into the assembly. Notice that the hand grip and the handle do not insert into the correct location. This is common unless you build your parts where they would appear in the assembly.

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CATIA Assembly Design

CATIA® V5R6

Bounding Box Select the Hand Grip. Notice the white box that is displayed around the hand grip. This is called the Manipulation Bounding Box. It allows for simple movements of the parts within the assembly. Note: If the bounding box does not appear, it can be turned on under the following options: Tools, Options..., General, Display, Navigation Tab, and the option Display manipulation bounding box.

Select and hold the first mouse button on any one of the white lines and drag the hand grip. Notice the hand grip moves in the direction of the line. This is a nice method to quickly manipulate your parts to various locations. However, the part cannot be rotated using this option. You will now use another method to manipulate your parts. Manipulation Make sure the Hand Grip is selected, and select the manipulation icon. Manipulation Parameters window appears.

The

The manipulation icon will allow for the part to be moved in any direction as well as rotated about any axis. The first row allows the part to be moved in the x, y, z, or any selected direction respectively. The second row allows the part to be translated along the xy, yz, xz, or any selected plane respectively. The third row allows the part to be rotated about the x, y, z, or any selected axis respectively. With respect to constraints will keep the part constrained, but will move the part in free directions. This will be demonstrated later. Take a moment to practice moving the parts around with the various options. Try the different methods of moving the parts, both translating and rotating. Being able to initially position your parts before constraining will make constraining your assembly much easier. Select OK on the Manipulation Parameters window. You will now constrain your parts.

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Assembly Design - Constrain & Manipulate, Page 29

CATIA Assembly Design

CATIA® V5R6

Coincidence Constraint Select the bottom of the handle as shown below. Make sure you select the bottom face and not just the edge. You are going to constrain the bottom of the handle to be coincident with the inside bottom of the hand grip.

Rotate the assembly until you can see into the bottom of the hand grip. The reason a coincidence constraint is going to be used and not a contact constraint is because these two faces are really designed just to be at the same position not really in contact with one another. However, a contact constraint could have been used. Hold down CTRL and select the inside bottom of the hand grip as shown. This will make both parts selected.

Select the coincidence icon. Properties window will appear.

The two parts will be moved and the Constraint

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CATIA Assembly Design

CATIA® V5R6

1 – Name

This area describes the name of the particular constraint. A unique name can be given to the constraint if desired.

2 – Supporting Elements

This area describes what elements are involved in the constraint and what was selected. In this case, the two components are the handle and hand grip. The type of elements that were selected were planes representing the two faces that were selected.

3 – Status

This area describes the status of each of the elements. If for some reason the constraint could not be applied, the element in error would have a different status message.

4 – Orientation

This is the most important field. Notice the two arrows displayed on the faces of the parts that were selected. The arrows denote what two sides of the faces are involved. There are three options for Orientation. Same

Make the arrows point the same direction

Opposite

Make the arrows point opposite directions

Undefined

Direction of the faces are neglected

Change the orientation of the constraint to be Opposite if necessary. The orientation will most likely need to be changed. Observe both parts to make sure they are correct. Select OK. This will implement the constraint. Notice the same constraint icons are used as in the Sketcher.

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Assembly Design - Constrain & Manipulate, Page 31

CATIA Assembly Design

CATIA® V5R6

Contact Constraint Select the inside of the hand grip and using the CTRL key select the outside of the handle as shown. You may have to manipulate your hand grip away from the handle in order to select the necessary surfaces. Use the manipulation icon with the With respect to constraints option selected.

Select the contact constraint icon. This will create a surface constraint between the two components. A contact constraint is desired here, because the handle and hand grip are usually always in contact with one another. The Constraint Properties window will appear.

All of the fields are the same as the coincidence constraint properties with the exception of the three options of point, line, and surface contact. These define whether a point, line or surface is in contact with each other, respectively. Contact constraints become very necessary when stress analysis is to be performed on assemblies.

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CATIA Assembly Design

CATIA® V5R6

Note: The following Assistant window may appear. This gives little bits of information as you perform various tasks, however it can become very annoying. To turn it off and keep it from coming on as you perform the exercises select the Do not prompt in the future option and then select Close.

Select OK. The hand grip is now attached to the handle. This completes the assembly. It is a good idea to hide all constraints before calling the document finished. Hiding the constraints keeps them from cluttering up the display when the assembly is used elsewhere. Hide your constraints and save your assembly.

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Assembly Design - Constrain & Manipulate, Page 33

CATIA Assembly Design

CATIA® V5R6

Close Handle Assembly and start a new assembly. Remember, it is always a good idea to give the new part or product a unique, descriptive name right away. Change the part number of the product to Bolt Cutters. Don’t forget to save your assembly now and at intermediate steps of the exercise so if something happens you will not have to start all over.. Insert the Handle Assembly twice. Both handle assemblies will be inserted in the same place, so there will only appear to be one inserted. However, if you look in the specification tree you will see that there are two. Move the handle assemblies so both are visible. This can be done by either selecting one, and dragging one of the white lines of the manipulation bounding box or by using the manipulation icon. At the top of the handle, there is a pivot point that is split in half as shown below. These two faces are going to be constrained together.

Select the contact constraint icon and then select the two faces as shown above. The two handle assemblies move to get the two faces in position where they can be in contact with one another. You should note that the two handle assemblies did not align themselves with the centers of the hole. You will put that constraint on next in order to get both of the handle assemblies connected correctly. Select the coincidence constraint icon. You will select the two centerlines of the holes in order to align them.

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CATIA Assembly Design

CATIA® V5R6

Select the centerline at the inside of the pivot hole as shown below. Moving the mouse cursor to the inside of the pivot hole will bring up the centerline. Either pivot hole can be selected. It is difficult to select the centerlines at times but if there is a curved surface available to select that is associated with the centerline you can select on the curved surface and it will select the centerline. In this case you may find it easy to select on the curved surface of the hole and you will see the centerline appear as you select.

Select the other centerline to align the two pivot holes. The two handles will snap together. It is very likely that they are rotated in a way which is invalid for the actual operation of the bolt cutters. There are no conditions being constrained that keep the two handle assemblies from rotating around the centerline. Manipulate one of your handle assemblies using the manipulation icon and the option With respect to constraints to look like the diagram shown below. It is important to use the With respect to constraints option or you may manipulate your components to not meet those constraints. If you ever do that, you can update the constraints in order for them to take effect again. The best option to use will probably be the rotation about a specified axis using the centerline as the axis.

This would make a good point to save your model before continuing.

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Assembly Design - Constrain & Manipulate, Page 35

CATIA Assembly Design

CATIA® V5R6

Insert the Head into the assembly. The head will come into the assembly in the incorrect location. Go ahead and move the head to a more suitable location at the top of the handles. You may have to reframe the display in order to see the head. With the head of the cutters near the proper location, the snap option will be used to move it into the correct location. Snap Select the snap icon. together.

This option will allow you to position or “snap” two objects

Select the centerline of the head and the top of one of the handles. Notice that when you went to select the top of the handle the centerline appeared.

Notice the series of green lines and arrows. Selecting these will reverse the direction of the snap and will flip the part in various ways. Use these to orient the head properly to the handle. Selecting anywhere on the screen will release the snap motion. Notice no constraints were applied when using the snap. Note: The rotation of the head may be different than what appears above, do not be concerned because you are going to rotate the head later anyway. Apply a coincidence constraint between the centerlines of the head and the handle that was just snapped together. This will make sure that the two centerlines will always remain aligned with one another.

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CATIA Assembly Design

CATIA® V5R6

Apply a contact constraint between the two surfaces that will move the head into the proper location. The end product should appear similar to the one shown below. Manipulate the head using the manipulation icon and the option With respect to constraints to look similar to the diagram shown below.

Another head needs to be inserted into the assembly. This time another method of insertion will be used. Defining a Multi Instantiation Select the define multi instantiation icon. This icon can be found under the fast multi instantiation icon, make sure you do not confuse it with the fast multi instantiation icon. This one has a little bar near the bottom of the icon. A Multi Instantiation window will appear.

Component to Instantiate – displays the component that is going to be instantiated. Parameters – defines how the component is going to be instantiated. The options are the same as when a feature is to be patterned in part design. Reference Direction – defines the direction of instantiation.

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Assembly Design - Constrain & Manipulate, Page 37

CATIA Assembly Design

CATIA® V5R6

Fast multi instantiation will allow a part to be inserted into the assembly multiple times at a given distance in a given direction. First the multi instantiation has to be defined. After it has been defined it can be used over and over again using the fast multi instantiation icon. Select the Head. This defines what is going to be instantiated. Make sure the New Instance(s) is set to 1, and the Spacing is set to 3in and select OK. This will place a new instance of the Head component into the assembly. Add coincidence and contact constraints to the new head and manipulate it so it looks similar to the diagram shown below. Remember, it is imperative that the head be in the right direction. Did you remember to manipulate with respect to constraints?

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CATIA Assembly Design

CATIA® V5R6

Smart Move This time a smart move will be applied to finish the assembly of the main components. Select the smart move icon. This icon can be found under the snap icon. It looks very similar to the snap icon except for a little red mark in the upper right of the icon. It will perform the same function as the snap icon but will allow for automatic constraint placement. The Smart Move window appears.

The Automatic constraint creation option allows for constraints to be created automatically. The list of constraints in the Quick Constraint section is the order of preference that smart move will go through when applying constraints. You can modify the order of preference by using the up and down arrows to the right. You can also change this list by using pull down menu Tools, Options..., Mechanical Design, Assembly Design, General tab. Make sure the Automatic constraint creation checkbox is on. This will create the necessary constraint between the two selections. Select the centerlines at the inside of the two pivot holes in the head as shown below. This will add the constraint to the two pivot holes and snap them together.

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Assembly Design - Constrain & Manipulate, Page 39

CATIA Assembly Design

CATIA® V5R6

Select OK. This will finalize the constraint creation. You may have to update your constraints in order for your assembly to appear correctly. Now you will move the assembly with respect to these constraints.

Select the manipulation icon and then select the rotate around any axis option. Also, make sure the checkbox for With respect to constraints is on. This will allow the parts to rotate about any given axis that is selected with respect to any constraints placed on the assembly. Select the inside of the pivot between the two handles and then select and drag one of the handles. Notice the whole assembly moves. Note, this is not kinematics because the assembly can be moved beyond the physical limits but this is a good way to test the model to insure that the entire assembly is constrained correctly. Select OK. This exits the manipulation window. There is only one thing left to add, bolts. You will now insert them. Hide your constraints. This will hide the constraints up to this point of the exercise. Insert the 1.25 Bolt into the assembly and move it to a close location. This bolt will go on the pivot between the handles. Add a coincidence constraint between the centerline of the bolt and the centerline of the pivot between the handles. Remember, this will align the bolt with the hole. Be sure to select OK when done.

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CATIA Assembly Design

CATIA® V5R6

Add a contact constraint to put the bolt into the pivot hole. This can be accomplished by adding a contact constraint between the outside of the handle and the underneath side of the bolt head. Your assembly should appear similar the diagram shown below.

This would be a good time to save your document. Do you notice that the bolt sticks out too far. You need to modify the bolt to be .75 inches instead of 1.25 inches long and save it as a separate part. You will do that next.

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Assembly Design - Constrain & Manipulate, Page 41

CATIA Assembly Design

CATIA® V5R6

Modifying a part to create a new part while in the assembly Expand the 1.25 Bolt branch until you see the PartBody. This will allow you to enter the part design workbench through the assembly. Double select PartBody with the first mouse button. This takes you to the part design workbench allowing you to perform tasks just like you do when in part design. This is similar to what you did when you created a new part in the assembly. This time you are going to modify a part. Change Pad.1 to have a Length of 0.75 inches. Notice that the bolt becomes shorter but the head of the bolt moves instead of the end of the bolt, this is determined by the original design of the bolt.

Right click on the 1.25 Bolt branch at the top of the branch as shown below. Since you do not want this new bolt to be referred to as a 1.25 Bolt you are going to change its name before you save the modified part.

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CATIA Assembly Design

CATIA® V5R6

Select the Properties option. A Properties window appears similar to the one shown below.

Change the Instance name and the Part Number to be .75 Bolt. Notice that Link to Reference area in the Properties window. This is very important, when you change the name you want to save the part in a way that will update this link. Using Save As, save the modified part as 0.75 Bolt. It is important that you use Save As instead of Save or you will save on top of the 1.25 Bolt. This will bring up a window similar to the one shown below.

Select OK. This will update your assembly with the new link to the .75 Bolt instead of the 1.25 Bolt. If you check the properties again you will notice the change. Double select on Bolt Cutters. This will return you to the main assembly and the constraints get updated positioning the bolt in the correct location. Remember you used a contact constraint between the bottom face of the bolt head and the outside face of the handles. You can go ahead and collapse the .75 Bolt branch if you want.

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CATIA Assembly Design

CATIA® V5R6

Since you wanted the modified bolt to be saved as a different part you had the extra step of renaming the part and the instance name. This procedure works well as long as you remember to save the part while in the part design workbench so it updates all of the links. You could have modified the part outside the assembly if you wished. Insert the 1.25 Bolt and constrain it to the pivot between the two heads. This is done the same way as you constrained the previous bolt. Fast Multi Instantiation Select the fast multi instantiation icon. been defined there is no need to re-define it.

Since the multi instantiation has already

Select the 1.25 bolt. Another bolt is automatically inserted into the assembly. This is a good way to put the same part into an assembly multiple times. If you know in advance that several are needed, you could re-define the multi instantiation to place multiple copies of the part at the same time. Add another bolt and constrain the two into the proper locations. This will finish the assembly. Be sure to hide all of the constraints before calling things completely done. Don’t forget to save your assembly.

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CATIA Assembly Design

CATIA® V5R6

This will be the next assembly put together. This assembly only has a few parts, but the table stud and duck are used several times. The names of the files are shown pointing to the respective part. All the machining table parts are held within the Machining Table directory. Start a new assembly, name it Machine Table and insert the Table into the assembly. Review previous sections if you are still unsure how to accomplish this. Move the table in the negative Z direction. This can be done by either using the manipulation icon or by using the bounding box. It is necessary to move the table some, so that all newly inserted parts do not insert inside the table, out of sight. Since the table never moves, it is a good idea to fix it in space. Fix Constraint Select the fix component icon. This will fix a part in space. Once fixed, it will not move. Generally when you are creating an assembly, it is a good idea to have one of the parts fixed and then assemble the remaining parts around that one. This works well when you have a part that normally does not change location. Select the Table. This will place a fix constraint on the table. Insert the Machine Part into the assembly. This is just a simple machine part that will be constrained onto the table in the appropriate place. This is a good first step before using CATIA to machine the part.

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Assembly Design - Constrain & Manipulate, Page 45

CATIA Assembly Design

CATIA® V5R6

Apply a coincidence constraint between the table and the bottom of the part. Remember, this can be done with either the coincident constraint icon or by applying a smart move. Move the machine part toward the center of the table as shown in the picture below. This will make it easier to apply the offset constraints.

Offset Constraint Select the offset constraint icon. The offset constraint allows two parts to be constrained at a specified distance from one another. The Constraint Properties window appears. Select the front side of the machine part and the front of the table (denoted by an F). The front side of the part being the flat side near the large radius

Change the Orientation to Undefined and the Offset to 5.0, select OK when done. This will set the part at 5 inches from the front of the table. The distance may need to be -5 depending on the order of selection. Assembly Design - Constrain & Manipulate, Page 46

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Place an offset constraint between the open end of the part and the right side of the table. This will position the part on the table. Change the Offset to 36 and select OK. The machine part should now be constrained near the center of the table. Placing all of the table studs and ducks takes some time, so it is advisable to save your assembly. In order to reduce the amount of time it takes to assemble all of the ducks and studs you will use the copy option to duplicate the geometry with the constraints that are the same for all of the studs and ducks. Insert Table Stud-6 into the assembly. These are used to hold the ducks and position them in the correct locations. Constrain the bottom of the stud to the bottom of a slot of the table. Just the bottom of the stud needs to be constrained at this time. Insert the 3x1.5 Duck into the assembly. This part will attach to the stud and then be used to hold the part in place for machining. Constrain the center of the duck to the center of the stud. This will align the duck with the stud enabling it to be attached but able to move up and down on the stud. Constrain the bottom of the duck lip to the top of the part. The assembly should be similar to the one shown below. You may want to move the stud away from the table in order to make it easier to work with when copying. If you move the stud you probably will want to use the manipulation icon so you can move it using the With respect to constraints option.

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Copying and Pasting with constraints Note: You need to make sure that your Paste components option Always with the assembly constraints is turned on under pull down menu Tools, Options, Mechanical Design, Assembly Design, Constraints tab. Using the CTRL key select both the Table Stud-6 and the 3x1.5 Duck from the specification tree. This will select both items. Press the third mouse button while on one of the items and choose copy or select the copy icon. This copies the stud and the duck. Select the Machine Table from the specification tree. This will allow you to paste the stud and the duck into the Machine Table assembly. Press Ctrl-V or select the paste icon. This will paste a copy of the stud and the duck on top of the original while keeping the constraints that were specified on the original. You should notice another Table Stud-6 and 3x1.5 Duck appear in your specification tree. Repeat the last two steps until you have a total of five studs and ducks. The specification tree should look similar to the one shown below.

You will now proceed to finish constraining the studs and ducks to their proper positions. The steps will be given for the first one and then it is up to you to finish constraining the rest of them. Constrain the side of one of the studs to the appropriate side of the first slot. This should position one of the studs in line with the first slot. Use the manipulation icon to move the stud and duck closer to the part using With respect to constraints.

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Angle Constraint Select the angle constraint icon. This will allow parts to be constrained at a specified angle, perpendicular or parallel to one another.

Select the front side of the machine part and the back of the duck as shown above. The Constraint Properties window will appear.

Change the Angle to 45 degrees and select OK. This will finish the constraint.

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Select the offset constraint icon, select the open end of the machine part and the rounded corner of the duck closest to the open end of the part as shown below. Notice that when you select the corner it is actually using the centerline of the radius corner not the outside surface of the corner. This will place a offset constraint between the outside edge of the part and the centerline of the corner.

Change the Offset to -4 and select OK. This constrains the table stud and the duck in the correct location to hold the part to the table for machining. However it is still necessary for the other studs and ducks to be positioned to keep the part from moving during machining.

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You will now finish constraining the rest of them using the dimensions shown below. The diagram will also show you which slot each stud should go in counting from the front to the back. The table has been omitted for clarity.

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The finished table should look like the following.

This would be a good time to save your model. Next, you will check to insure that everything is constrained.

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Explode Select the explode icon.

Depth

Exploding a product will separate all the pieces.

Determines how far into your assembly the explode will affect All levels

goes completely through the tree

First level

only goes through the first level, leaving sub-assemblies alone

Type

Determines the type of explode that will occur 3D

moves geometry in all directions.

Projection

projects the exploded geometry to the current window frame, at the rotation axis

Constrained

explodes the geometry keeping centerline coincidence constraints intact. This explosion type gives results most similar to reference documents, but also takes the longest to compute.

Selection

The product that is going to be exploded

Fixed product The component that will not move when the explode takes place Select in Fixed product input field and select the Table. Selecting a fixed part will keep the one part in the current place while moving all the others. Leave Depth to All levels and Type to 3D and select OK. The geometry should “explode” above the table. A warning message displays warning about the modified product positions.

Select Yes to the warning. This warning is telling you that the positions of the components of your assembly are about to move. If you do not have your part properly constrained then it will be unable to reposition them correctly.

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Select the update icon from the bottom toolbar. The assembly should update and all the parts should return to the original positions. If some parts are not in the correct locations, then the constraints are incorrect. It is a good idea to explode, and then update all assembly design models before calling them finished to insure all parts are constrained. You are now finished with this assembly, remember to save your document.

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Advanced Constraint Options This section will cover the remaining constraint options that have not been covered yet. After this, all constraint options will have been covered.

This assembly is made up of two sub-assemblies. One sub-assembly being a stationary wheel and the other being a swivel wheel. The stationary wheel will be assembled first. Below is the wheel with the filenames labeled. All documents can be found in the Rolling Table directory.

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Start a new assembly and insert all three parts into the assembly. The filenames for the three parts are StatWheel Mount, Wheel and Wheel Pin. The three parts will not insert into the correct locations. Remember to give your assembly an unique part number such as Stationary Wheel. Fix Together Constraint You are going to put a fix together constraint between the mount and the pin. The purpose of this is to just show you how fix together works and then you will remove the fix together constraint in order to complete the assembly. Normally you would use this constraint when two or more parts are positioned approximately instead of precisely. This allows the attached parts to move together instead of independently. The important thing to remember is that anything that overrides the constraints (explode, manipulating without respect to constraints) will cause the fix together to change definition. This is because updating will not restore the two objects in the same position, all it does is force the one object to move with the other. Select the fix together icon.

This automatically brings up the Fix Together window.

Select the Wheel Pin and the StatWheel Mount, then select OK. This will fix the two parts together. Using the manipulation icon with the With respect to constraints option on, move the mount. Notice that the pin moves with it. This is how fix together works. Turn the With respect to constraints option off and move the mount. Notice that only the mount moves and there is no update option. Turn the With respect to constraints option back on and move the mount. Notice that the pin moves with it again. Select OK. This will exit the manipulation option. Expand the constraints and delete the fix together constraint. You are going to apply other constraints to the mount and the pin in order to position the two parts precisely with respect to one another.

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Quick Constraint Select the quick constraint icon. Quick constraint will “guess” what constraint is to be applied. The order in which they are guessed is available for modification under the pull down menu Tools, Options, Mechanical Design, Assembly Design, Quick Constraint. From there, you can specify what constraints are to be created before others. The default list is assumed for this exercise, so modify with caution.

Select the centerline for the wheel pin hole on the stationary mount and the centerline of the wheel as shown above. Notice the parts snap together and a coincidence constraint is generated automatically.

Select the quick constraint icon, then select the wheel pin and the center of the wheel as shown above. Again, a coincidence constraint is placed on the wheel pin and the center of the wheel. As you can see this can be very handy in quickly applying constraints.

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Select the quick constraint icon and then the inside of the mount, and the flat outside part of the wheel hub as shown above. Notice the quick constraint places a surface constraint on the two components. This constraint would normally be fine but for this exercise you will change the constraint to be a coincidence constraint instead of a contact constraint. Changing a Constraint Select the change constraint icon. This will bring up a window of constraint options that could be placed between the two parts. If the window does not appear select the constraint that you just created. This list will change as different types of constraints are selected in different circumstances.

Select Coincidence from the ChangeType window and select OK. The contact constraint is now changed to a coincidence constraint. Any type of constraint can be changed in a similar manner.

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Apply an offset constraint between the outside of the stationary mount and the end of the wheel pin. Set the offset to 0.625. This can be done by either using a quick constraint and then changing it, or by using an offset constraint.

Save your assembly since you will use it later. Do not forget to save it with an unique part number if one has not already been assigned.

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The next assembly will be the swivel roller. Due to the complexity of the bearing, it will be assembled first, then used as a sub assembly to the full swivel roller. The bearing is shown below partially exploded to display all parts with labeled filenames.

Start a new assembly and insert the Bearing Retainer and the Bearing. Note only one bearing is necessary. The rest will be automatically put into the assembly. Also notice the yellow socket on the bearing retainer. This is the first socket of the circular pattern and is where the ball bearing will be constrained. Apply a contact constraint to the ball bearing and the yellow socket. This is accomplished by selecting the surface constraint, the yellow part of the socket, and then the ball bearing.

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Reusing Patterns The pattern that was used to create the sockets in the bearing retainer will now be used for the ball bearing. Expand the Bearing Retainer tree until the Bearing Pattern is visible.

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Select the reuse pattern icon. This icon will allow the user to re-use any pattern used in a part design. Placing bolts in a defined pattern is another good example of where this could be used. The Instantiation on a pattern window appears.

Pattern

contains the pattern that is going to be used

Instance(s)

how many instances the pattern contains

In component

the component that the pattern exists in

Component to instantiate

the item you are going to use in this pattern

First instance on pattern re-use the original component

the original component is used and others are added

create a new instance

the component is copied and then placed into the pattern locations

cut & paste the original component the component is deleted by being cut and then pasted into the pattern locations Re-use Constraints All

all constraints are re-used

None

no constraints are re-used

Selected

the selected constraints shown in the window are re-used

Put new instances in a component

places all new instances into its own assembly

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Select the Bearing Pattern from the tree. The bearing pattern is entered into the Instantiation on a pattern window. Select the Bearing. The bearing is inserted into the window as well as displayed on the screen. Notice the surface constraint that was created will be re-used. This means that all new bearings will have the surface contact with the bearing retainer. If there was more than one constraint, then all constraints or those selected would be re-used. Make sure the Instantiation on a pattern window is set the same as below and select OK. The new ball bearings are inserted into the retainer with the constraints applied.

Now, all of the ball bearings have been inserted into the assembly and constrained all in one step. Next, you will add the bearing race to finish the bearing assembly. Insert the Bearing Race into the assembly. The bearing race will need to be constrained a distance apart. In reality, a bolt would determine the distance the two races would be apart (varying the distance or pressure would determine the ease of movement). The race also needs to be constrained to the center of the bearing retainer. Apply a coincidence constraint between the center of the race and the center of the bearing retainer. This should make the race and the retainer line up. The race may also need to be moved closer to the bearings for easier manipulations.

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Apply an offset constraint of 0.125 between the flat surface of the bearing race and the center of one of the ball bearings as shown below. The center of the sphere can be selected by selecting the outside of the sphere. Since all the bearings are linked together, they will all move at the same time. Note: All the other constraints are hidden in the picture.

Insert another bearing race. Remember, this can be done by either doing a fast multi instantiation or by inserting an existing component. Apply a coincidence constraint between the centerlines of the two races and a distance of .25 in between the two flat surfaces of the bearing races. This should complete the bearing assembly. Try exploding the assembly and then updating it to be sure all the constraints are correct. Make sure you save your model since you will need this assembly later.

The rest of the assembly is now ready to be constructed. It is up to you to decide what type of constraints are necessary to finish the swivel wheel and table.

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Swivel Wheel Assembly

You should locate the wheel pin the same way you did with the stationary wheel. Place an offset between the outside of the mount and the end of the wheel pin of .625 inches. Note: if you explode it to check your constraints you may only want to explode the first level.

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Rolling Table Assembly

This can be a complex assembly to put together if you do not fully understand how each part goes together. The following steps and diagrams are for your understanding, it is not necessary that you perform the constraints in this order. The first step is to assemble the framework using an End Angle, Side Angle and a Vertical Angle. The diagram shown below will give you an idea of how these three pieces fit together. This can be accomplished by using coincidence constraints using the holes. Make sure you attach the two pieces to the correct end of the Vertical Angle.

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The next step is to continue inserting additional pieces and constraining them to get the framework shown below. You can either insert the pieces again or you use fast instantiation. You may even want to attempt to use copy and paste to speed up the process.

The next step is to add a Wheel Mount Angle and a Lg Angle and constrain them using the holes at the bottom of the Vertical Angles. The diagram shown below will give you an idea of how the pieces fit together. Notice there is a gap between the bottom of the Lg Angle (1) and the Wheel Mount Angle (2).

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The next step is to continue inserting additional pieces and constraining them to get the framework shown below. You can either insert the pieces again or you use fast instantiation.

You are now going to add the Table Top. The Table Top aligns itself with the outside surfaces of the End Angle and the Side Angle. It is in contact with the top surface of those pieces as well.

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Now you will insert the Bottom Plate into the assembly. Remember that gap, this is where the bottom plate should go. The easiest way is to constrain the position using the centerline of the holes. The Bottom Plate should be in contact with the bottom surface of the Lg Angle and the top face of the bottom lip of the Wheel Mount Angle. In other words it should stack from the bottom up as follows: Wheel Mount Angle (1), then the Bottom Plate (2) and then the Lg Angle (3).

The wheels should attach to the bottom surface of the Wheel Mount Angles and should align themselves with the holes. Remember, there are two different wheels, the stationary wheel and the swivel wheel. Two stationary wheels should go on one end and two swivel wheels should go on the other end.

Do not forget to explode and then update your assembly to insure correct constraints. Note: you probably want to explode using only the first level. Remember to save your assembly when done. © Wichita State University

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Weld Planner You are going to add weld symbols to the top of the table. Select the weld planner icon. The weld planner will allow welding symbols to be added to the assembly to denote welds. These symbols could be imported into a drawing of the table if you created a draft of this assembly. Select the edge between the table top and one of the top angles as shown. Selecting this edge will display the Weld Planner and the Weld creation windows. The Weld Planner window only shows what components are involved. The Weld creation window defines what type of weld symbols are to be added.

The four boxes with drop down arrows display many different types of welding symbols. There are hundreds of different combinations that could be created. You will only create one. If you would like to learn more about the different types of welding symbols that can be generated, consult an engineering drawing or welding book. They usually display many of the different types of welding symbols that can be used. You will place weld symbols that indicate a single fillet weld.

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Key S in the lower left box and change the lower left symbol to a triangle. The Welding creation window should appear like the one shown below.

Select OK. This places the weld symbol on the table edge and it adds two branches to the tree: Weld Planners and Annotations Set.

Add the same weld symbols to the other three inside edges under the table. This will complete the rolling table assembly. Congratulations, the table is fully assembled, and ready to be drafted. Make sure you save your assembly.

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Activating/Deactivating constraints This exercise will cover the activating and deactivating of constraints to represent different locations of an assembly. There are many times that an assembly will contain parts that are not at one specific location and you want to have constraints that represent the different limits of the assembly. Create a new product and call it Piston. You are going to insert the two components that are necessary for the creation of the piston. Insert the Cylinder and Shaft from the Piston directory. The cylinder is cut in half so that you can see what the different constraints are actually doing.

Put a coincidence constraint between the centerline of the shaft and the centerline of the cylinder. This will force the two items to line up. Next you are going to put contact constraints on the two parts to position the shaft at both limits. Put a contact constraint between the end of the shaft and inside the end of the cylinder as shown below. This will force the shaft to be at one limit of the piston.

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Put a contact constraint between the inside of the shaft and the inside of the other end of the cylinder as shown below.

The following window appears.

This states that the constraint you just put on over constrains your assembly. This is because you have a the first contact constraint still active. Select OK. You will now deactivate the first constraint. You will probably need to expand the Constraints branch in your specification tree. Using the third mouse button, select the Surface contact.1 constraint and select the Surface contact.1 object option. This will show the following options.

Select Deactivate. This will deactivate that constraint and your assembly will change to utilize the second contact constraint instead. You should notice a set of parenthesis on the lower left of the constraint icon in the specification tree. This is how you know what constraints are deactivated. On the assembly itself the deactivated constraints should appear grey. Deactivate the Surface contact.2 constraint as well. You are now going to apply an offset constraint between the end of the piston and inside the end of the cylinder.

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Put an offset constraint between the end of the piston and inside the end of the cylinder. This is between the same two surfaces as the first contact constraint. The following warning appears because this constraint is similar to the contact constraints you already have.

Select OK. This closes the Warning window and allows you to define the offset value. Change the offset to be 4.75 inches and select OK. It may need to be negative depending which face you selected first. You are now going to rename the various constraints so they have a more meaningful representation.

Using the third mouse button select the first contact constraint and select Properties. This will bring up the following window.

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Select the Constraint tab and change the Name to be Retracted. This names the constraint to give it a better representation of what it will do. Change the name of the second contact constraint to be Extended. Change the name of the offset constraint to be Halfway. The constraints should appear in your tree similar to that shown below.

Practice activating and deactivating the various constraints to show the different limits of the piston. Remember, only one of the constraints can be active at a time or it will be over constrained. Save your assembly.

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External References Up to this point you have mainly concentrated on working with assemblies where the pieces were already built using Part Design. This is a good method if you know the shape and dimensions of all the parts. However, there are many times that you want a part to connect one item to another and you do not want to have to determine all the dimensions or worry about if the part is going to collide with other parts in the assembly. Therefore instead of creating all of the parts individually, you can use faces and geometry from other parts to help in the creation of new parts and external references are generated. Using the pull down menu Tools, Options you can access the Mechanical Design, Part Design, General tab. Under this option is External References. A diagram is shown below.

There are four options listed: Keep link with selected object - This option will have your part create external references when using geometry from other parts in the assembly. Therefore if that geometry changes on one of the other parts it will effect your new part. Create external references in Show mode - This option will have the external references be generated in Show mode instead of Hide mode. Confirm when creating a link with selected object - This option will have a confirmation window come up to confirm that you want a link created with the object. Only use published elements for external selection - This option will only allow you to use published elements for selecting objects to use as external references.

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For this exercise you need to make sure you have the Keep link with selected object activated. You are going to finish creating the side assembly for a bridge truss. The finished bridge truss is shown below.

Open the Side Assembly document. It is located in the Truss directory. It should appear similar to the diagram shown below.

Open the Link - 22.5 document. It is located in the Truss directory. You are going to open this document and save it in your area while the assembly is opened so that it will automatically update the links. Save the Link - 22.5 document, select OK to update the links and close the document. You are going to want to be able to make modifications to this link later in the exercise, that is why you are saving it in your area.

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You are going to create the angled link that attaches at four locations on the assembly. Select the new part icon and then select the Side Assembly. part into the assembly.

This will insert a new

Key Angled Link in the Part Number window and select OK. A new part appears in the tree. Select No for the origin. Expand the Angled Link component until PartBody is accessible and double select it with the first mouse button. This will switch you to Part Design.

Select the sketcher icon and select the front face of the link shown above. This will use that face as an external reference to determine the sketch support. The sketch may turn your assembly around the wrong way making it hard to select the appropriate curves. If it does turn the assembly around by selecting the normal view icon and that will take you to the other side. Make sure you are looking at the outside of that link instead of the inside of it. Your horizontal axis should be pointing to the left.

Using the elongated slot icon create a slot as shown above. This is the approximate shape of the angled link.

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Using the constraint icon put a coincidence constraint between the lower left curve of the elongated slot and the curved end of the link at the bottom as shown below.

Put a coincidence constraint between the upper right curve of the elongated slot and the curved end of the link at the top as shown below. This completes the sketch of the angled link.

Exit the sketcher and create a pad using this sketch that is 0.50 inches thick. Make sure it is going in the right direction. The link has been created. Notice the External References branch in the specification tree. If you expand it you should see a surface that was used to define the sketch support and the two curves that you used for the coincidence constraints. If you look closely you will see a little green light at the lower left corner of those elements. If you open the angled link document and you see a red light then it needs to be updated. Also if you look at the part icon next to Angled Link in the tree you will notice that the gear is green instead of yellow, this means that the part has external references.

Hide the planes. You do not want the planes to appear every time you use this part. Using Save As, save your part as Angled Link. This creates an angled link document.

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Double select Side Assembly to return to the assembly. Since the angled link was created using the assembly geometry you do not need to constrain it because it is already constrained to that location. However you will now insert the angled link in three more times and you will have to constrain them to the proper location. Insert three more angled links in to the assembly. You can either using the insert an existing component icon or use a multi-instantiation. Constrain them to go in the correct positions as shown below. You should use coincidence constraints to constrain the angled links in the right orientation. Then use contact constraints to force links in the right position. There is only one side that they can attach on and touch at both ends.

Save your assembly. Open your Angled Link document. Notice the pad and the external references in the tree. You can always isolate those elements so they still exist in this part but are no longer referencing external objects. You can do that by using the third mouse button, going down to the object and choosing isolate. Do not isolate them now. Close your Angled Link document. In order to get a better idea of what the external references mean besides just helping to create a part while in an assembly you will perform some actions just to see how the angled link changes. Open your Link - 22.5 document. You are going to modify the radius of the link. Go in to the sketch and modify the radius to be three inches instead of 1.5. Make sure you exit sketcher after changing the value. Save and close the document.

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Open your Angled Link document. Notice that the angled link does not look any different here but the external references now have red lights instead of green lights. This means that they need to be updated because something in the assembly has changed. Open your Side Assembly document. Notice that the angled links have changed size based off the change that was made to the link. In order to get the Angled Link updated you will switch to that window and save it.

Switch to the Angled Link document by changing to that window. Notice that the external references now have green lights because they know what has changed since the assembly is opened. Save your Angled Link document and your Side Assembly document and close them. Using the same technique, change the link back to a radius of 1.5 inches and update the angled link and the assembly. Make sure you save all of the necessary documents.

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Assembly Features There are some operations that can be performed on assemblies that will update all of the parts affected according to the operation. These are referred to as assembly features. The following operations are available in assembly design. Split

-

splits your assembly with a plane, face or surface

Hole

-

creates holes in your assembly

Pocket

-

uses a sketch to create a pocket in your assembly

Add

-

adds a body to your assembly

Remove

-

removes a body from your assembly

You should be familiar with all of these options from Part Design. Since you are familiar with them only a couple of them will be covered in this section. The first exercise will involve your Side Assembly that you just finished in the previous exercise. You are going to use the assembly features to put holes in your assembly. Hole Open your Side Assembly document. This is located wherever you saved it from the previous exercise. It should appear similar to the one shown below.

Select the hole icon. assembly.

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This will allow you to put a hole through multiple parts of your

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Select the curved edge of the angled link as shown below. This will automatically put the concentric constraint on the hole in order to position it correctly.

Select the front face of the angled link as shown above. This will tell the hole option where to start the hole. Two windows should appear, one may be on top of the other. The Hole Definition window looks like your standard hole window from Part Design except there is no Up To Next option. The Assembly Features Definition window allows you to specify which parts should be affected by the hole feature.

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CATIA Assembly Design

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Looking at the Assembly Features Definition window you will notice two sections, one for Parts possibly affected and the other for Affected parts. All the parts in the Affected parts section will have the hole affect them, the ones listed above are the parts that you can have the hole affect. If you want the hole to affect some of those parts you need to move them using the icons that are located between the two sections. moves all of the parts down to the Affected parts section moves just the one part selected down to the Affected parts section moves all of the parts up to the Parts possibly affected section moves just the one part selected up to the Parts possibly affected section Highlight affected parts

this option will highlight the parts that are in the Affected parts section of the window

Move the Link - 22.5.4 down to the Affected parts section along with the Angled Link.1 that is already there. This will make the hole affect both of those parts. However it is important to note that since every one of the Link - 22.5 and Angled Link parts are based off of the same document, if one gets affected they all get affected.

Activate the Highlight affected parts option. You should see the angled link and the link that is in contact with it highlight. This is a good way to check that you have the correct parts selected.

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In the Hole Definition window change the options to be Up To Last with a Diameter of 1 inch and select OK. You should see the hole appear in the angled link and the link that is in contact with it. You should also notice that some holes appear in other places of your assembly. That is because all of the links are based off of the same document, if you change one they all change. In the specification tree you should see an Assembly features branch. This lets you see the features and it shows what documents are being affected.

You are now going to put the hole on the other end of the angled link. In this case you just want to find a place where you can put the hole in the other end of both links. Select the hole icon. Select the curved edge of the angled link as shown below.

Select the front face of the angled link as shown above. Move the Link - 22.5.2 down to the Affected parts section along with the Angled Link.2 that is already there. You can select the Highlight affected parts option if you wish.

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In the Hole Definition window make sure the options are Up To Last with a Diameter of 1 inch and select OK. The assembly should have holes in the ends of all of the links and appear similar to the diagram shown below.

You should also see the Assembly features branch contain another Assembly Hole.

Save your Side Assembly. This will automatically save all of your documents that were modified in the assembly. Open your Angled Link document. You will notice that the two holes are in link and in the tree you can see the holes but the icons have arrows in the upper left corner signifying that they are assembly features.

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CATIA Assembly Design

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Double select on Hole.1. A warning window appears telling you that you can not modify the hole because it is an assembly feature. The only place you modify the hole is in the assembly.

Similar to the external references you can isolate assembly features so that they are no longer linked to the assembly. You can do this by using the third mouse button, going down to the object and choosing isolate. Close your document. There is no need to save since you made no changes to the angled link.

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You are now going to use another assembly feature to help create a mold for an existing part. You will create an assembly with the two parts of the mold and the part that needs to be molded and then use remove to form the mold to the correct shape. Add Open the Mold Creation assembly. It is located in the Molded part directory. This assembly contains the top piece and the bottom piece of the mold as well as the part definition that needs to be removed and added. The top piece and the part to be removed are hidden at the moment. It should appear similar to the diagram shown below.

Select the add icon. This will allow you to select a body that you want to add. You are going to select the PartBody of the Molded part - add. Expand the Molded part - add branch until you can see the PartBody and then select the PartBody. This defines the body that you want to add. The Assembly Features Definition window appears. You only want the Bottom piece to be affected.

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Move the Bottom piece down in to the Affected parts section. This will add the part to the bottom piece. An Add window appears.

Select OK. This adds the part to the bottom piece. An Assembly Add appears in your tree under Assembly features.

Hide the Molded part - add branch. Notice that the bottom piece now contains that volume as part of its definition. Hide the Bottom piece and show the Top piece and the Molded part - remove branch. You may want to show the Molded part - remove branch first so you can see what you are going to remove. Remove Select the remove icon.

This allows you to select a body that you want to remove.

Expand the Molded part - remove branch until you can see the PartBody and then select it. Once again the Assembly Features Definition window appears. Move the Top piece down in to the Affected parts section. A Remove window appears.

Select OK. This removes the part from the top piece. An Assembly Remove appears in your tree under Assembly features.

Hide the Molded part - remove branch. Notice that the top piece has the volume removed from it. Save the assembly and the modified parts in your directory. Assembly Design - Assembly Features, Page 90

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Open the Bottom piece document from your directory. It should appear similar to the one shown below.

Notice in the specification tree the Add branch as shown below.

Open the Top piece document from your directory. It should appear similar to the one shown below.

Notice in the specification tree the Remove branch as shown below.

Close all of the documents. The other assembly features work similarly. The main thing to remember is that the external references and the assembly features are ways you can create associations between your parts and the assembly itself.

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DMU Fitting Simulation Pull down menu changes Insert

Shuttle

Allows a group of parts or products to be defined that will make a simulation set

Simulation

Allows shuttles to be moved and recorded in a simulation

Clash

Inserts a clash analysis

Distance and Band Analysis Inserts a distance analysis Group

Allows a group of geometry to be defined

Tools

Publish

Creates an HTML document that will include pictures, feature text, user inputted text and a VRML ( virtual reality ) image (everything does not have to be included or in a particular order) © Wichita State University

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Analyze

Graphic Messages

Displays either the name of the component or the coordinate of the component

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DMU Fitting Simulation Workbench Changes workbenches Selects geometry Groups a product or products into a shuttle Creates a simulation from shuttles Compiles the simulation either into a replay or an AVI file Shows a compiled replay while displaying analysis information Generates a volume from the path and area covered by a simulated object Explodes an assembly but does not leave product exploded

Generates a clash and interference analysis Generates a distance and band analysis Turns clash detection off during simulation Turns clash detection on during simulation Stops the simulation if a clash is detected Finds the shortest path without collisions along a given simulation path Reduces the number of unnecessary points along a given simulation path

Shows the current selected object(s) and relationships with other objects

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Manipulation Toggles preview window

Resets back at the original location

Reframes in the preview window Positions on a target element

Defines a snapping axis for approaches

Inverts the normal vector

Attaches compass to shuttle

Edits position with dialog box

Detaches compass to shuttle

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Bottom Toolbar Changes DMU Viewing

Lets you look at a document in a specific direction Returns to the previous view Returns to the next view Magnifies an area of the view Allows depth sections or fog to be applied to the view Places a horizontal ground in the view Allows the lighting of the view to be changed

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DMU Fitting Simulation DMU Fitting simulation will allow a single part or multiple parts to be moved simultaneously. This can be very beneficial when clearances need to be checked as products are taken apart or put together. Open the Compressor Pump. The compressor pump can be found in the Air Compressor directory. This model is a pre-defined model. All the constraints are in place and there are no clashes. You will use this model to get a feel for what fitting simulation can do. First there are a few fundamental things to take into account. Assemblies that are going to be put into a fitting simulation do not need to be constrained. In fact, fitting simulation ignores all constraints. In order to make your model move according to constraints, you would need to apply kinematics which is covered in another class. Anything that is going to be simulated needs to be in a shuttle. A shuttle is like a group or set of geometry and parts that gets moved. The individual pieces do not move alone, only the shuttle. With these few things in mind you will begin.

Creating a simple simulation Change to the DMU Fitting Simulation workbench, if not already there. This can be done by either selecting the change workbench icon in the top right of the toolbar or by selecting Start, Digital Mockup, and DMU Fitting.

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Creating a shuttle Select the shuttle icon. This will bring up two different windows. One window will be the preview window, similar to the preview windows seen in the DMU Space Analysis section. The second window needs a bit more attention.

Name

Defines a descriptive name for the shuttle. A good name should always be given to the shuttle so it can be identified easily.

Selection

Defines what is included in the shuttle.

Reference

Denotes a reference to the shuttle. If a reference is defined and then the reference is moved, the shuttle will move accordingly. If no reference is defined, the shuttle will always remain at the same location.

Move

This will move either the entire shuttle or just the shuttle axis. This will be covered later.

Validation

This option would be very useful to simulate the motion of a fluid’s container. Since you would not want the container to rotate and roll all around, you can use the validation option to keep it from moving past a specified angle. This will be covered later.

Make sure the Selection area is highlighted and select the Pulley. This can be selected from either the tree or from the screen. Take notice that the compass attaches itself to the pulley. Using the compass will be very important to creating a simulation. Change the Name field to Pulley Shuttle. This will allow you to identify the shuttle in the tree. Select OK. This creates a shuttle that contains the pulley. The pulley is now ready to be simulated. You can see the Pulley Shuttle in the tree under Applications, Shuttle.

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Note the small hand and axis that is at the center of the pulley. This is the shuttle symbol. If it is a nuisance, it can be hidden just as any other symbol. Leave it showing for the time being. As you saw above shuttles are stored in the Shuttle branch. Other branches such as Simulation and Replay branches will also be added. There are two drain plugs on the side of the compressor. Put both of them into a shuttle. Select the shuttle icon.

This time both drain plugs will be inserted.

Change the Name to Drain Plugs. This will more clearly describe the shuttle rather than Shuttle.2. Select both Drain Plugs. This can be accomplished by either selecting them from the screen or by selecting them from the tree. Notice both drain plugs are displayed in the preview window. This shows that they are included in the shuttle. Also take note to the position of the shuttle axis. The axis stays with the first selected plug. If both plugs were selected before the shuttle icon was selected, the axis would display in the geometrical center of the plugs and not on the first plug selected. Since the plugs are dependant on where the base of the compressor is located, it should be made a reference. Select the Reference field and then select the dark green base of the compressor. Compressor Base.1 is inserted into the Reference field but is not shown in the Preview window. This is because the compressor base is only a reference and will not be simulated with the shuttle. Select OK. This completes the second shuttle. Next, a simulation will be made.

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Creating a simulation Select the simulation icon. A Select window will display showing the available shuttles in the assembly. You may have to scroll down in order to see the two shuttles.

Select the Pulley Shuttle and then OK. This will again bring up two windows. One window will be the preview window showing what is going to be moved. The second window is the Edit Simulation window. The compass is also located at the center of the shuttle.

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Name

Defines a name for the simulation. Each simulation should be given a unique and descriptive name for future reference.

Arrow 1

The loop mode icon. Selecting this icon will change the loop mode between single loop, forward and reverse, or continuous forward.

Arrow 2

The time step indicator. Each motion placed in the simulation indicates a time step and is displayed in the box.

Arrow 3

The replay interpolation step. In general, it controls the speed of the replay.

Animate viewpoint

Allows the viewpoint position to be recorded with the simulation. This would be useful if a certain area needs special attention while a component is being removed. This option will be used more in the DMU Navigator section.

Insert, Modify, Delete, Skip

Allows the user to insert steps manually, modify the position at a desired step, delete a step or skip over a step during replay.

Automatic insert

Allows the positions to be automatically inserted. This is not a good option to have on when first starting.

Edit analysis

Allows you to add or remove various analyses to your simulation. The analyses are commonly generated using the DMU Space Analysis workbench.

Edit simulation objects

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Allows you to add additional shuttles that you want to be part of the simulation.

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Compass It is important to understand the compass so it can be used effectively.

The compass, usually green when attached to geometry, has three main direction vectors, U, V, and W, as shown by the arrows below. Selecting one of the vectors will move the attached object only in the direction of the vector. Normally, the compass will be in the upper right corner of the workspace, labeled X, Y, and Z. When the compass is attached to an object, it is re-labeled to U, V, and W. If one of the vectors is along the same direction as one of the primary axes then there will be a pipe ( | ) symbol and the primary axis is also stated. This can be seen below, circled.

The compass also has the three principle planes as noted by arrows below. Selecting one of these planes will allow the attached object move along the plane of the selected plane. The rotation arcs, located along the outside of the planes, work the same. Selecting an arc will rotate the object about one of the given axes.

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Select the U axis vector and hold. Move the pulley away from the part. The U axis vector is noted as U|X, meaning it is in the same direction as the X axis. Moving the cursor to the vector, it will highlight, and then just select and hold it while moving the mouse away from the compressor body. Since you selected the U axis, the pulley will only move in the U axis direction. The pulley should look something like the following picture.

Now the position needs to inserted into the simulation. Select Insert in the Edit Simulation window. This will draw a line from the original position of the pulley to the new position. This line is the simulation path. Any where that the shuttle moves and a position is inserted a line is generated. Select the UV rotation axis on the compass and rotate it 90 degrees clockwise. It does not need to be exactly 90 degrees, anywhere close will do. Select Insert in the Edit Simulation window. This will make the number of simulation steps two. You will now move the pulley one more time and then call it good.

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Move the pulley a considerable amount in the U direction. Move it about twice as far as the pulley was moved from the compressor. Select Insert again. This will insert the final step. Before selecting OK on the Edit Simulation window, replay the simulation to be sure it is right.

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Set the replay interpolation step to 0.04 and the replay mode to forward and reverse . This will show the simulation both ways and slow it down so it does not flash by. Remember the replay interpolation step is set in the input field where 1 is currently. The forward and reverse option is changed by using the icon to the left of the input field with 3.00 in it.

Select the play forward icon. you defined.

The pulley will begin to move, following the path that

When done viewing the replay, select the pause icon. This will stop the simulation. Feel free to try adjusting the speed of the replay as well as try the other play control icons. Before moving onto the next step, make sure the simulation is paused. Change the name of the simulation to Pulley Removal and select OK. The pulley will snap back to the original position but the shuttle icon and the replay path will remain. Congratulations on your first simulation. Now would be a good point to save your model. Notice that in the Applications branch you now have a Simulation branch. Now that you have a simulation, it needs to be made into a replay so that it can be viewed at any time. This means that the simulation will have to be compiled into a replay.

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Compiling a simulation Select the compile simulation icon. window.

This will bring up the Compile Simulation

There are two main options when compiling a simulation. First, a replay can be generated. The replay can only be viewed from within CATIA V5. Second, an animation file can be generated. There are two different animation file types that can be created. The first type is a Microsoft AVI file. This will create a single video file that can be viewed from any computer. Be warned, the animation files created will be very large, even for a simple animation. The second file type is that of still images. A series of JPEG images, or frames, will be generated and then through the use of animation software, they can be viewed. The definition area allows you to change what simulation will be compiled, the time step that it will be compiled at (same as the replay interpolation setting from the Edit Simulation window) and if the viewpoint is going to be compiled into the animation. Change the name of the replay to Pulley Removal and set the time step to 0.04. This will generate a replay at the same speed that was first viewed in the simulation replay. Select OK. The slider along the bottom will begin to move across. This will indicate the amount of the replay compilation that is completed. The compilation of the replay will only take a brief second. At the bottom of the tree, a replay branch will be added. With the replay compiled, the shuttle and simulation can be deleted. The replay holds all the information that the shuttle and simulation does but does not give the flexibility of modifying the simulation.

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Replaying a compiled simulation Double select the Pulley Removal replay. This will display the Replay window. This window is very similar to the Edit Simulation window. This is the same window that will appear if you select the replay icon. Therefore you do not have to select the replay from the specification tree.

Most of the icons are the same as on the Edit Simulation window. The one exception is the replay time step interpolation list is now a replay speed. If the simulation was compiled at too slow a speed, it can be sped up using this dialog. Replay the simulation at various speed. Close the window when done. This will complete the process of compiling a simulation and viewing the replay. Here is a review of the process to generate a simple animation. First, a shuttle needs to be made

The shuttle contains any geometry that is going to be simulated.

Next, a simulation is made

The simulation is a series of motions that you apply to a shuttle to move it about the workspace.

Compile the simulation into a replay or animation file.

Replays can be viewed from within CATIA, other animation files have to be viewed with external software.

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Next, create a simulation to show the drain plugs being removed. Select the simulation icon and then select the Drain Plugs shuttle. Remember, the drain plugs were put into a shuttle earlier. Since both drain plugs are part of the shuttle, they will move at the same time. Change the name of the simulation to Drain Plug Removal. Remember, you should always give everything a descriptive name. Otherwise, complex assemblies will be cluttered with meaningless names. Move the drain plugs along the V direction. They should be out about as far as the pulley was moved. You may have moved the pulley the opposite way, if you did that is okay.

Select Insert. This is a vital step, be sure to insert the simulation step. Replay the simulation from within the simulation editor. Select OK when done. This will help to insure that it is right before you complete the simulation. This also gives you a chance to determine what speed the animation needs to be replayed at. A speed of 1 is way too fast, but a speed closer to 0.04 or 0.02 is more acceptable. Select the compile simulation icon. view it as a replay.

Remember, the simulation must be compiled to

Notice the simulation name is set on Pulley Removal. This is because that is the first simulation created. This will always be the default simulation name. It is necessary to make sure it is changed to the right simulation each time.

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Change the Simulation name to Drain Plug Removal. Also, change the Time step to 0.04. One last thing needs to be changed before selecting OK. The name needs to be more unique than Replay.2. Change the Name to Removal of the Drain Plugs. Select OK when done. The name of the replay can be any length desired, so feel free to give as long of a descriptive name as necessary. Replay the Removal of the Drain Plugs replay. This makes sure that everything came out right. Congratulations, this completes your second full simulation. Now would be a good time to save your document. You will now start working with more complex simulations.

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Multiple Objects moving in same simulation The next simulation that you create will involve a few more motions as well as multiple objects moving within the same simulation. First, shuttles need to be made of the various simulation objects. Creating a group Notice there are quite a few bolts in the assembly. These bolts should be grouped together. Select pull down menu Insert and select Group. The Edit Group window appears. A group is nothing more than a collection of parts within an assembly. Groups can be very useful to denote similar parts. In this case, the top head bolts will be put together in a group. Another group will be made to comprise of the bolts holding the compressor head and the cylinder base.

Select the six yellow bolts holding the head down. This can be done by either selecting the bolts from the tree (the bottom six hex bolts) or by selecting them graphically. Change the name of the group to Head Bolts. Select OK when done. There is a new branch now added to the Applications group.

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Select pull down menu Insert and select the Group option again. This time a group containing all of the bolts holding the compressor head to the cylinder base will be created.. Select all of the .5x3 Hex bolts and the .25x3 Hex bolts. Again, this can be done graphically or by selecting the bolts from the tree. Change the name of the group to Cylinder Bolts and select OK when done. This will put all the bolts in another group. These groups will now be used in your simulations. Select the shuttle icon.

The head bolts will be made into a shuttle.

Change the name of the shuttle to Head Bolts and select the Head Bolts group. Select OK when done. Selecting the group will need to be done from the tree. Notice the head bolts do not appear in this preview window. Create a shuttle for the Cylinder Bolts group. Call the shuttle Cylinder Bolts. Remember, this can be done by selecting the shuttle icon, changing the name of the shuttle, then selecting the Cylinder Bolts group. Create a shuttle for the Cylinder Head (the bright green part) and create a shuttle for the Compressor Head (the bright blue part). Be sure to give good names to the shuttles (naming the shuttles the same as the part is sufficient). Now, all four parts will be simulated at the same time. Select the simulation icon. The list of available shuttles are displayed. All four shuttles will be selected at the same time.

Select the four shuttles just created. Note: You will have to hold down Ctrl to select more than one shuttle at a time. The shuttles will be the Head Bolts, Cylinder Bolts, Cylinder Head, and Compressor Head. Select OK when all four are selected. Everything will appear the same as when you create a simulation with one object.

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This time, the Automatic insert option will be used. Select the Automatic Insert checkbox. Anytime the compass is moved, the Insert button will automatically be selected. This means you have to be careful not to make unnecessary motions of the shuttle. The preview window will be important when working with multiple shuttles. The preview window will show what is going to be moved. Move the Head Bolts shuttle in the W direction, enough to clear the cylinder head. Remember, the bolts will move when you select the W vector on the compass and move in the vertical direction. Notice as soon as you release the mouse, the first step of the simulation is inserted.

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Move the bolts along the V direction, the same distance that the pulley and drain plugs were moved. Again, the simulation step was inserted as soon as the mouse button was released. Next, the cylinder bolts will be moved. Select the Cylinder Bolts shuttle. This can be done by either selecting the shuttle icon for the cylinder bolts or by selecting the shuttle from the tree. Watch the Preview window. When the correct shuttle is selected, the bolts will be shown in the preview window. This time the bolts will be moved an exact distance. Either double select the compass, or select the editor icon. compass manipulation dialog box.

This will bring up the

Under the Translation area change the Z or W to 15 and select the plus (+) next to the Z or W field. This will move the bolts up (along the W axis) fifteen inches. Next, a rotation step will be applied. You will apply two motions at the same time. Select the Automatic insert checkbox to turn it off. This will allow you to make two motions at the same time without them being one after another. Under the Rotation area change the Angle to 45 and select the plus (+) next to the Z or W axis field. This will rotate the bolts about the W axis by 45 degrees. Under the Translation area change the X or U to 40 and select the minus (-) sign. This will translate the bolts 40 inches in the negative U direction. Select Insert in the Edit Simulation window. This will insert the new position into the simulation.

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Close the Compass Manipulation window. If for any reason an exact distance needs to be applied, using the compass manipulation window is the best choice. You will now look at the simulation that you have created so far. Change the replay interpolation step to be 0.04 and the replay mode to forwards and reverse. This will slow the replay down to an adequate level, and show the simulation forwards and backwards. Select the play icon and watch the simulation. Notice the yellow head bolts move into position first, then the aqua compressor head bolts move. Also, take note to the aqua bolts as they move away from the compressor. Notice the bolts rotate and move at the same time. Pause the simulation and select the jump to end icon. This will make sure any new simulation steps are placed at the end of the current simulation. Next, both the cylinder head and the compressor head will be moved simultaneously.

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Moving two shuttles at once Select the Cylinder Head shuttle. Be sure to have the Automatic insert checkbox turned off. The green cylinder head should show up in the preview window. Move the cylinder head a considerable distance in the W vector direction. Since both the cylinder head and compressor head will be moved at the same time, room needs to be left to completely remove the compressor head too. Select the Compressor Head shuttle and move the compressor head so it clears the purple pistons but does not clash with the cylinder head. The assembly should appear as shown on the next page. Note that the insert button has not been pressed on the Edit Simulation window yet.

Select Insert from the Edit Simulation window. If you watched closely, you would notice two lines being drawn. The two lines denote the movement of the cylinder head and the compressor head. Move the cylinder head and the compressor head in the opposite direction of the bolts. This will keep the one side from becoming cluttered.

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Select Insert from the Edit Simulation window. This will draw the two lines indicating the motion of the cylinder head and the compressor head. Your assembly should look something like the picture shown below.

All four shuttles have now been used in your simulation. Replay the simulation to make sure everything runs smoothly. When done replaying, press pause and name the simulation Compressor Head Removal. Select OK when done. This completes the simulation. Now the simulation needs to be compiled into a replay. Compile the Compressor Head Removal simulation into a replay. Use the same name for the replay. Notice the simulation lines are starting to clutter the screen. Press the third mouse button while on the simulation lines and select Hide/Show. Go ahead and hide the shuttle icons as well. This will hide the simulation lines and the shuttle icons to keep them out of the way. This would be a good time to save your document.

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Next, a few more options will be investigated, as well as some other methods of creating simulations.

General methods and options Open the Robo Welder assembly. This can be found under the Robo Welder folder. This document is pre-assembled with all the constraints in place. You should be in the DMU Fitting Simulation workbench. Exploding the assembly Select the explode icon. This option works very similar to the option found under the Assembly Design workbench. Although similar, this option will not allow you to leave the parts exploded.

Select Apply. This will scatter the parts that make up the Robo Welder. Run the slider back and forth in the explode window to see how the parts fit together. When done, select Cancel. This is a good way to determine how an assembly was created without damaging the assembly. The simulation that will be created is going to do a number of things. First, the full range of motion of the arm will be shown. Kinematics are not going to be applied but they will be simulated through fitting simulation. Once the motions are made, a swept volume will be created. This will be discussed more in-depth at a later stage. Select the shuttle icon and create a shuttle using the Base Pivot part. This is going to put the shuttle axis in the center of the part. This will work fine for simulating kinematics due to the ability of the pivot to rotate about the Z axis. Change the name of the shuttle to Primary Pivot and select OK. That creates the first shuttle. The next shuttle will be the Arm - Cylinder.

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Moving the shuttle axis Select the shuttle icon and select the Arm - Cylinder. As expected, the shuttle is displayed at the geometric center of the part. In order to show proper motions of the arm, the shuttle cannot be located there. The shuttle axis needs to be moved. Select the Axis checkbox under the Definition area of the Edit Shuttle window. This is going to allow you to move the axis of the shuttle instead of the geometry. The compass manipulator icons will be used to move the shuttle to the pivot point of the cylinder arm. Select the target icon.

This will allow you to define a new target for the shuttle axis.

Select the face as shown above. You should see a plane with an arrow appear as you move the cursor over the surface. Make sure the arrow is pointing outward toward the open side. You can hold the Shift key to invert the arrow before selecting the surface. You can always use the invert icon to invert the axis if the axis is pointing the wrong direction after you select the face. The compass along with the shuttle should appear as shown below.

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CATIA Assembly Design

CATIA® V5R6

Select the Shuttle checkbox under the Definition area of the Edit Shuttle window. This will make it so the simulation will move the geometry within the shuttle as well as the axis. In order for the shuttle to move with the primary pivot, the primary pivot shuttle needs to be used as a reference. If it is not used as a reference, then when the primary pivot is moved, the cylinder arm shuttle will not move with it. Creating a shuttle referencing a shuttle Select the Reference field and then select the Primary Pivot shuttle. It is very important that the shuttle be selected and not the geometry. To insure that the shuttle has been selected, expand the tree so you can see the shuttles under the Applications branch. The shuttle, Shuttle.2, should be under the Primary Pivot shuttle.

Change the name of the shuttle to Cylinder Arm. Select OK when done. This completes the second shuttle. The other shuttles are going to be made in a similar fashion.

Create a new shuttle for the Arm - Piston. Using the target icon select the face shown above. Make sure you have the Axis option checked. This will move the compass and axis to go along the centerline of that cylinder.

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CATIA Assembly Design

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Select the Shuttle checkbox. Make the reference of the shuttle the Cylinder Arm shuttle. Change the name of the shuttle to Piston Arm and select OK when done. Given this type of assembly, each of the new shuttles will reference back to the previous shuttle. With this relationship type, when you move a shuttle, all of the shuttles underneath will move with it as well. Create a new shuttle for the Hand Pivot. Change the name to Hand Pivot and make the Piston Arm shuttle the reference. Select OK when done. There should be no need to change the location of the compass. Your assembly should appear similar to the one shown below.

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CATIA Assembly Design

CATIA® V5R6

Create a new shuttle for the Welding Tip. Using the target icon select the face shown above. Make sure you have the Axis option checked. Make sure the arrow points outward toward the open side. Select the Shuttle checkbox. Change the name to Welding Tip and make the Hand Pivot shuttle the reference. Select OK when done. There should now be five shuttles, all making up a long line. Next, they will all be simulated at the same time. This would be a good time to save your document.

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Customizing automatic insertion The automatic insertion option will be used again in this section. This time, it will be customized differently. Select pull down menu Tools, Options, Digital Mockup, DMU Fitting, DMU Manipulation tab. This is where various things such as clash detection defaults and automatic insertion defaults can be changed.

Change the Automatic Insert Configuration option to be While mouse moving. Instead of an insertion point being placed in the simulation every time the mouse was released, it will be placed in the simulation at specified intervals. This will make the two fields modifiable. Since everything in here is going to be rotated, the distance option is not of much concern. The Angle option will be changed, however. Change the Angle to 15. This will automatically insert a step into our simulation every time a shuttle is rotated 15 degrees. Select OK. This will set the options. The options carry with your logon, so when you log into a different computer the option will remain set.

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CATIA® V5R6

Simulating shuttles referencing a shuttle Select the simulation icon and select all five shuttles to simulate. Select OK when all five are selected. Remember, you will have to hold down Ctrl or Shift to select all of the shuttles. Remember, the Preview window will show you what is going to be simulated. It is a good idea to keep the Preview window visible so you will know what is going to be moving. Select the Automatic insert checkbox. Just because the options were changed for the automatic insertion, does not mean that the option is turned on. The checkbox must still be selected before the points will automatically be inserted. Rotate the Primary Pivot about the W axis clockwise one complete circle. Notice the step numbers incrementing as you move the compass. This is the automatic insertion working every 15 degrees. Change the current shuttle to the Cylinder Arm. This can be done by selecting the cylinder arm from the tree. Rotate the Arm 180 degrees about the W axis. Be sure to move the arm in the correct direction. Turn the Automatic insert off. This can be done by selecting the Automatic Insert checkbox again. You are turning this option off because several motions are going to be made simultaneously. Your assembly should appear similar to the one shown below.

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CATIA Assembly Design

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Select the Piston Arm shuttle. Extend the piston arm out until it is near the end of it’s limits. Since the Automatic insert is turned off, if you move the piston beyond the limits it does not hurt anything. Just move it back into the cylinder until the plunger is not showing. Do not press Insert yet. Change the current shuttle to the Welding Tip shuttle. Rotate the welding tip down 90 degrees. Again, the 90 degrees is just an approximate. Do not press Insert just yet. Rotate the Hand Pivot shuttle about the U axis 90 degrees so the Welding Tip points at you. Select Insert when done. This will insert the step that comprises of all the other motions. Your assembly should appear similar to the one shown below.

Replay what is currently in the simulation. Be sure to hit pause and the jump to end icon before continuing. Notice the arm extends outward, rotates, and the welding tip turns all at the same time. Rotate the Primary Pivot shuttle about the W axis 180 degrees. Do not hit the Insert button yet. You are going to make the robotic arm make several motions at the same time again. Slide the Piston Arm shuttle back into the retracted position. Again, do not press Insert yet. There is one last motion that will be made. Rotate the Welding Tip shuttle back into a straight out position. Change the name of the simulation to Multi-Motions, selecting Insert and OK when done. This will complete this simulation. The important thing to keep in mind from this exercise is, you have to make the shuttles reference each other if they are going to move with each other. Otherwise, the simulation will not work. It is left up to you to try simulating the arm without referencing the other shuttles. Compile the simulation and view the replay. Do not forget to give the replay a descriptive name and do not forget to change the time step of the simulation. Since you have the Multi-Motions replay, the simulation will be deleted. It will be assumed that you do not want the extra information to be carried with the document. Do not delete the shuttles however. The shuttles will be used again.

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Select the Multi-Motions simulation. The simulation will have to be selected from the tree. Press Delete to delete the simulation. The simulation can be deleted by either pressing delete on the keyboard, by pressing button three on the mouse and selecting delete, or using menu edit and selecting delete from there. Notice all of the extra lines and points disappear. They were all part of the simulation and deleted with it. If you wanted to keep the simulation around, then you could have hidden the simulation and the lines would hide with it. Next, a couple of new simulations will be generated to show the full limits of the arms. First, a distance analysis will be placed on the welding arm to give a general idea of how far the arm can reach.

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Distance and band analysis Select the distance and band analysis icon. window should appear.

Name

A Edit Distance and Band Analysis

the name you specify for the distance analysis

Type Minimum

minimum distance between the two selections

Along X, Y, Z

gives the component distances in the respective directions

Band analysis

displays color coded bands of distance away from the selected part

Inside one selection

distance analysis between items inside a single selection

Between two selections

distance analysis between two selections

Selection against all

distance analysis between all elements and the selected element

The various options are covered in more detail in other courses. For now you will learn how to just use this option to put a basic minimum distance on your assembly to be used in fitting simulation. Change the options to be Minimum and Inside one selection. This will allow you to select the two parts in one selection and it will calculate a minimum distance between those two parts.

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Select the Welding Tip and the Base and select Apply. The distance analysis appears on your assembly as well as in a Preview window so that you can verify the distance analysis before you select OK.

Change the name to Extent Analysis and select OK. This will accept the distance analysis, leaving the distance on your assembly as well as adding a Distance branch to your specification tree.

Select the simulation icon and select the Primary Pivot shuttle for the simulation object. Select OK when done. Since an analysis is applied to the assembly, you want to include it into the simulation. Select the Edit Analysis button at the bottom of the Edit Simulation window. This will bring up an Edit Analysis in Simulation window. Select the Add... button. This will bring up a window of all the distance analyses. Since there is only one distance analysis in the document, only one shows. Select Extent Analysis. Select OK when done. The Extent Analysis will display in the Edit Analysis in Simulation window. Multiple analyses can be added or removed from this window.

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Select OK. Notice the Distance option is no longer greyed in the Edit Simulation window. The analysis can be attached to the simulation but can be turned on or off. By default, it is turned off. Turn the Distance option On. Just select the drop down for the Distance option and then select On. This will make the distance analysis automatically update with the simulation. Rotate the arm a complete circle around the W axis with the Automatic insert turned on. Next, the arm will be rotated 180° over the top. Select the Cylinder Arm shuttle. You will note that the Preview window does not change. This is because you did not select the cylinder arm shuttle to be included in the simulation. This simulation is only concerned with the primary pivot shuttle. This can be fixed however. Select the Edit simulation objects button at the bottom of the Edit Simulation window. This will bring up the Edit Simulation Objects window where all the simulation objects in the simulation are displayed. The Cylinder Arm needs to be added to the list of simulation objects. Select Add..., select Cylinder Arm, and then select OK until back at the Edit Simulation window. This will add the cylinder arm to the list of available simulation objects. Now you can change the current shuttle to the Cylinder Arm shuttle. Select the Cylinder Arm shuttle, then rotate the arm 180° over the top with the Automatic insert turned on. You should have noticed the distance analysis automatically being updated as the arm moved. Change the name of the simulation to Retracted Motions and select OK. Expanding the tree for the Retracted Motions simulation, you will note the Extent Analysis branch. This means that the analysis is linked to the simulation. If the analysis gets modified, such as different elements being analyzed, then any simulation utilizing the analysis will show the new analysis.

Generate a replay for the Retraced Motions simulation. As the retracted motions simulation is being compiled, you will note the distance analysis does not move with this simulation. Not to fear, when you view the replay, you will have the option to turn on analysis or not.

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CATIA® V5R6

Activate the Extended constraint. This can be done through various methods. It will be left to you to decide the best way to activate the constraint and make sure it is updated. Perform the same simulation with the welding tip extended. The steps will be similar to those earlier. Be sure to add the distance analysis into the simulation. When done, name the simulation Extended Motions. Compile the simulation into a replay named the same. Be sure the arm remains extended. The simulation will try to update the arm back to the original shuttle position. If the arm retracts, just update the constraint again. This will create a replay of the robotic welder in an extended and retracted position. Next, swept volumes will be generated for the replays.

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Swept Volume Swept volumes are useful for creating a volume that represents the area needed for a particular item to operate. You can then insert this swept volume in to another assembly to check for interferences. Select the swept volume icon. This icon will create a volume from the moving part. The volume will be the area that is used as the part sweeps around. A Swept Volume window should appear.

Replay

Defines what replay will be used to generate the swept volume. Only replays can be used to generate swept volumes.

Product(s) to sweep

Defines what products are going to be swept. Just one or all of the products that are included in the simulation can be used to generate a swept volume.

Filtering precision

Defines how precise the volume will be. The larger the number, the more jagged the volume will be. The correct value for this field can only be determined from trial and error. It will depend on what the swept volume will be used for.

Reference product

Allows you to reference another moving object for the product you are sweeping

Number of positions

This cannot be modified by the user. This area will update when a swept volume is generated.

Initial

How many points are currently in the replay

Filtered

Changes according to the Filtering precision size

Change the Replay to the Retracted Motions replay. This will define what replay is going to be used to generate a swept volume.

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Select the ... button next to the Product(s) to sweep field. This will bring up the Product Multiselection window.

Select only the Welding Tip.1 and select OK. Since the welding tip is the furthest extent of the assembly, it is the only one of interest and will be the only product used to generate the swept volume. Change the Filtering precision to 2. This will generate a position every two inches the welding tip moves. Select Apply. This will take a few seconds to generate, so be patient. When the swept volume is generated, a Preview window will display showing the swept area that the welding tip occupies as it moves around. This volume can be useful when creating plant layouts. Instead of replaying the arm simulation to determine if it clashes with other equipment, the volume can be placed in the plant to quickly see the range of the arm.

Select OK. This will bring up a Save As window. The swept volume will be saved as a CGR file. This CGR file can be imported into any assembly. © Wichita State University

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Change the name of the swept volume to Retracted Sweep and save it. This will save the CGR file into your drawings directory. Create a sweep of just the welding tip from the Extended Motions replay. Save the sweep as Extended Sweep. The steps to generate the sweep is the same as before. Save your document.

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Simulating assembly Up to this point all of your fitting simulations had to do with taking an assembly apart. This exercise will cover the steps necessary to take an existing assembly and simulate how the assembly would be put together. This requires you to move the shuttle the individual parts before creating the simulation and then simulate them going back together. Open the Helicopter document. It is located in the Legos directory. It should appear similar to the one shown below.

Select the shuttle icon and select the 1x6 Thin Block.2. This is the left propeller blade. The first step you are going to do is to move the shuttle axis to be at the centerline of the last cylinder on the right. Switch the Axis option on and using the target icon select the cylinder on the right end of the block. You want the compass to be located at that location pointing straight up. If it is pointing down use the invert icon to invert the direction.

Change the option back to Shuttle. This will allow you to move the shuttle which holds the part to a new location.

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CATIA Assembly Design

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Select the snapping axis icon. This will create a snapping axis which will assist you when reassembling. It will snap your compass to that location when you are close enough, how close is determined by the settings under pull down menu Tools, Options, Digital Mockup, DMU Fitting, DMU Manipulation tab. You can adjust the Snap Sensitivity based on Position and Orientation. You should see a little red axis appear at the base of the compass. Using the compass move the part up in the w direction and over in the u direction. This will locate the part in its starting position for the simulation. Name the shuttle Prop1 and select OK. This creates the shuttle, the propeller should be away from the assembly and you should see a red axis which represents the snapping location. Do the same thing for the other propeller blade: move the axis to the far left cylinder, create a snapping axis and then move the part up in the w direction and over in the v direction. Make sure you use the Axis and Shuttle options properly, if you make a mistake you can always Cancel. Name the shuttle Prop2 and select OK. You should see a little red axis representing the snapping axis. Create a shuttle for the grey propeller. There is no need to move the shuttle axis. Select the snapping axis icon.

This creates the snapping axis.

Using the compass move the part up in the w direction. You should see the red snapping axis down below. Name the shuttle Propeller and select OK. This is all of the shuttles you will create for this exercise. You can always come back later and do the rest of the helicopter.

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CATIA Assembly Design Select the simulation icon.

CATIA® V5R6

A list of your shuttles should appear.

Select all three of the shuttles and select OK. Select the Propeller shuttle and move it down the w axis until it snaps in to place and select Insert. You should have noticed the propeller actually move beyond the compass and snap in to place when you got close to the proper location. Select the Prop2 shuttle and move it along the v axis and select Insert. You should move it until it is approximately above the correct location of the propeller. Move the shuttle down the w axis until it snaps in to place and select Insert. If you find that you did not move the shuttle the correct distance in the v axis earlier just delete the moves and try again. Select the Prop1 shuttle and move it along the u axis and select Insert. You should move it until it is approximately above the correct location of the propeller. Move the shuttle down the w axis until it snaps in to place and select Insert. If you find that you did not move the shuttle the correct distance in the u axis earlier just delete the moves and try again. Name the simulation Propeller and select OK. This creates the simulation of the propeller being assembled. Compile the simulation into a replay named Propeller using a Time step of 0.04. This will slow the simulation down so that you can actually see the pieces move in to place. Play the replay to verify. propeller.

Verify that the replay shows the assembling of the

If you want you can go back and create shuttles of all the pieces with snapping axes and then create one simulation that shows the entire helicopter being assembled. Save your assembly. It is important to note that as soon as you go back to the Assembly workbench, the helicopter will reassemble based off of the constraints that have been applied to it.

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CATIA Assembly Design

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Review This exercise is to review some of the various options that have been covered and to make sure you have a good understanding of how to create fitting simulations. Open the Machine Vise document. It is located in the Machine Vise directory.

Make sure you are in the fitting simulation workbench. Exploding Explode the assembly to get an idea of the various parts that are involved. As you can see there are many pieces. This exercise will walk you through what to do but it relies on your previous experience to know how to do it. Select Cancel. Besides exploding you can also look at the various pieces and even select them using the selection panel icon.

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CATIA® V5R6

Current selection panel Select Machine Vise from the specificaton tree and then select the current selection panel icon. The Current Selection Panel window will appear.

Tree tab

shows the selected object in a tree format

3D tab

shows the selected object in 3D

Reframe on selection

reframes your working window so that the selected object is centered in the window

Freeze

freezes the display of the 3D object and will not change even if you select a different object until you turn freeze off

View related objects

shows you the related objects in the window

As you can see there are a few sub-assemblies in this assembly. You are going to want to take apart the sub-assemblies as well as the complete assembly. Close the window by selecting the x in the upper right corner. You will probably want to expand the sub-assemblies so that you can see the parts that they contain in the specification tree.

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CATIA Assembly Design

CATIA® V5R6

Creating groups Create a group that contains the two pins of the Handle named Handle pins. Remember groups are nice when you want to control a set of objects with just one shuttle instead of having to define shuttles for each object and then having them reference each other. Create a group that contains the two set screws of the Sliding Jaw assembly named Set screws. Create a group that contains the two flat screws of the Sliding Jaw assembly named Sliding jaw screws. Create a group that contains the two flat screws of the Base Assembly named Base screws. Now that you have those groups defined you can use them to create shuttles. Creating shuttles First level of Machine Vise Create a shuttle for the Vise screw. It does not need to reference anything and the default axis is fine. Name it Vise screw. Create shuttles referencing the Vise screw shuttle for the Collar and Special key. Since the default axis has a direction along the centerline of the Vise screw then it will work fine without having to change it. Name the shuttles Collar and Special key respectively. Remember, by referencing the Vise screw shuttle, when you move the vise screw shuttle the Collar and the Special key will move as well. Base Assembly The Base will be the only part of the entire assembly that will not be moving. Create shuttles referencing the Base for the Jaw plate and Base screws. For the Base screws the default axis will work fine since it has a direction along the centerline of the holes in the Jaw plate. The default axis is fine for the Jaw plate as well. Name the shuttles Base jaw plate and Base screws respectively. Remember the Base Screws are a group. Handle Create a shuttle for the Handle rod. You need to make sure your axis is in the direction of the centerline of the Handle rod. Name the shuttle Handle rod. Create shuttles referencing the Handle rod for Handle ball.3, Handle ball.4 and Handle pins. You need to make sure the axis for the Handle balls are in the direction of the centerline of the Handle rod. You also need to make sure the axis for the Handle pins is in the direction of the centerline of the pins. You may have to hide one of the balls in order to select the centerline of the pin, when done show the ball. Name the shuttles Handle ball1, Handle ball2 and Handle pins respectively. Remember the Handle pins are a group. Fitting Simulation - Review, Page 140

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CATIA Assembly Design

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Sliding Jaw assembly Create a shuttle for the Sliding jaw assembly. The default axis is fine for this shuttle. Name the shuttle Sliding jaw assembly. Create a shuttle referencing the Sliding jaw assembly shuttle for the Sliding jaw, Set screws, Slide key.1 and Slide key.2. The default axis works fine for all of these shuttles since there is an axis that goes in the direction that each respective part needs to move. Name the shuttles Sliding jaw, Set screws, Slide key1 and Slide key2 respectively. Create shuttles referencing the Sliding jaw shuttle for the Jaw plate and the Sliding jaw screws. The default axis works fine for both of these shuttles since there is an axis that goes in the direction of the centerline of each respective part. Name the shuttles Sliding jaw plate and Sliding jaw screws respectively. The Applications branch should look like the following if expanded.

Save your assembly. This would be a good time to save before continuing.

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You are now ready to create your simulation. Creating the simulation The following steps will walk you through how to move each shuttle. It is suggested that you do not use automatic insert, but then you will have to remember to select the Insert button after each move. The steps are given so you have an idea of how to disassemble this assembly, you only need to be approximate so your simulation may look slightly different from the pictures shown. Create a simulation named Machine vise using all of the available shuttles. You will have to define all the movements before selecting OK. You will start with the handle. Move the Handle pins out and the Handle balls out and over at the same time as shown below. Remember in order to have both Handle balls move at the same time you should move them both and then Insert and then move them both again and then Insert again. Move the Handle rod down through the hole. It should appear similar to the diagram shown below.

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CATIA Assembly Design

CATIA® V5R6

Move the Vise screw out to the point where there still is clearance between the Collar and the Base. There is not enough room to slide the Collar off of the Vise screw. Move the Sliding jaw assembly forward so that there is enough room to take the Collar off of the Vise screw. This will allow you to remove the Special key and the Collar. Move the Special key straight out in the u direction. This allows the key to come off without running into the Vise screw. Move the Collar along the centerline of the Vise screw and then out toward the Special key. This allows the Collar to clear the Vise screw before moving it out. It should appear similar to the diagram shown below.

Move the Vise screw out the rest of the way. Notice that the Collar and the Special key moved with it. This is because you made them reference the Vise screw. It is okay since you left enough clearance for that to happen. Now you will remove the Sliding jaw and take it apart. Move the Set screws down underneath the Base. This will allow you to remove the Slide keys.

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Move the Slide keys straight out along the v direction past the end of the Base. You will want these to move together so you will move both and then select Insert. It should appear similar to the diagram shown below.

Move the Sliding jaw up above the Base. The will allow you to remove the Sliding jaw screws and the Sliding jaw plate. Move the Sliding jaw screws out from the Sliding jaw. Move the Sliding jaw plate out from the Sliding jaw. It should appear similar to the diagram shown below.

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Move the Base screws out, then up and then out some more. This will allow you enough room so that you can pull the Base jaw plate out and then up. Move the Base jaw plate and out and then up. This ends your simulation, hopefully you press the Insert button along the way. It should appear similar to the diagram shown below.

This finishes the simulation, make sure you named it Machine vise. Save your assembly. This is a good time to save before generating a replay.

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Creating a replay and an AVI file Create a replay of the Machine vise simulation using a Time step of 0.1. Name the replay Machine vise. Create an AVI file called Machine vise using a Time step of 1.0. This will allow you to view the simulation outside of CATIA. Save your assembly.

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Checking for clash When you work with assemblies it is very important that you check for interferences. It is much better to find an interference that causes the assembly not to work before the parts are produced then to find out after their manufactured. This gives you an opportunity to fix the errors or to redesign a part before production. In general there are two types of clashes that you will find when working with assemblies, bad design of a part or an error using assembly constraints. Open the Hard Drive document. It is located in the Hard Drive directory. This exercise will show you how to compute interferences and then have you fix any clashes that you discover. Select the clash icon.

Name

The Check Clash window appears.

gives the interference calculation a name

Type Contact + Clash

looks for contact situations as well as clashes (interferences)

Clearance + Contact + Clash

looks for contact situations, clashes and for components that do not meet the designated clearance

Inside one selection

analysis between items inside a single selection

Selection against all

analysis between all elements and the selected element

Between all components

analysis between all components

Between two selections

analysis between two selections

Choose the options Contact + Clash and Between all components. This will calculate all contact situations and clashes between all of the objects in your assembly.

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Change the name to Hard Drive Interference and select Apply. It computes and the window changes to look like the one shown below.

The results shows all the contacts and clashes in the assembly. You should see that there are 2 clashes and 80 contacts. Since you are only interested in the clashes in this case you will apply a filter that will only show the clashes. Under Filter list change it to Clash and then select the Apply filters button. Only the two clashes should appear in the window.

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Select the first clash from the window. It will appear in a Preview window. It appears that it interferes where the Motor Case fits in to the Drive Case.

Select the second clash from the window. It appears in the Preview window. It appears that the Motor Armature interferes with the inside of the Motor Case.

Select the export as icon and save the output as an xml file. This will allow you export your clash detection to either a text file or an xml file. This creates a directory in your area with a style sheet and all the jpeg images. You can see the generated report if you open the xml file with a supported browser.

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Select OK. Under the Applications branch there is a new branch called Interference.

Now that you are familiar with the problem areas of this assembly. You will fix them. Open the Motor Case document. It is also located in the Hard Drive directory. You do not want to close the assembly. Look at the bottom of the Motor Case so that you can compare it to the Drive Case. Open the Drive Case document. Look at the slot for the Motor Case. Do you notice the problem? The problem is that the bottom of the Motor Case has a fillet in the corners and the Drive Case has sharp edges. You will need to put a fillet on the edges of the Drive Case so that it has the same radius as the Motor Case. Go back to the Motor Case window and find out what the radius is of the fillet. You will use that radius to fillet the sharp edges in the Drive Case. Go back to the Drive Case window and fillet the four corners. It should appear similar to the diagram shown below.

Save the Drive Case in your area and close it. You will want to have it update the links in your assembly so make sure you select OK when that window appears. Go back to the Hard Drive assembly window. You are going to update the analysis to see if you corrected the problem.

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Double select on the Hard Drive Interference branch with the first mouse button. This opens the Check Clash window. Select Apply. This will calculate the interference analysis again. Notice that there is only one interference now. Select OK. You will now fix the other problem. Open the Motor Armature document. It should appear similar to the one shown below.

Since you did not put this assembly together you will be told what is wrong. When the Motor Armature was constrained to the Motor Case it was assumed that the bottom of the big plate was in contact with the top of the Motor Case. This is not true, if you were to measure the height of the inside of the Motor Case you would find it to be 0.5 inches which is the height of the lower portion of the armature. Therefore, you do not have to change the design of anything, you just have to fix the way it was assembled. Close the Motor Armature window and the Motor Case window. This should only leave the Hard Drive assembly window. Go to the assembly design workbench. Delete the contact constraint between the Motor Armature and the Motor Case. It should be Surface contact.6. This will remove the bad constraint and you will be able to put the correct constraint between the two parts. Using the manipulation bounding box move the Drive Case down and also move the Motor Case down so that you have access to the inside of it. This will give you access to put the proper contact constraint on the Motor Case.

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Put a contact constraint between the bottom face inside the Motor Case and the bottom of the lower portion of the Motor Armature. The diagram shown below shows the two surfaces.

The hard drive should reassemble itself. Hide the surface constraint that you just created. You will now check to see if you have taken care of that problem as well. Double select on the Hard Drive Interference with the first mouse button. The Check Clash window opens. Select Apply. Notice that there are no clashes, just contacts. Select OK and save your assembly.

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Clash detection There are also some tools available to check for clashes as you are performing a simulation. You can use these to help you create a fitting simulation without interferences. There are three different icons that can be used and they are explained below. this option means that clash detection is turned off, up to this point, this is the mode that was in effect when you performed your fitting simulations this option means that clash detection is turned on, as you clash with other objects red elements will appear showing you the clash this option means that on clash detection the simulation will stop, if you come in contact with another object it will not let you clash This exercise will show you how the options work using your Hard Drive assembly that you just fixed. If you did not fix it then it will not work correctly in this exercise. Open your Hard Drive assembly. Create a group containing the four Lid Screws and a group containing all twelve of the Hex Bolts. Create shuttles for the following: Lid Screws group, Case Lid, Hex Bolts group, Platter Cap.1. Using the default location is fine. Hide the Case Lid. This will make it easier for you to create the other shuttles that you are going to use. Create a shuttle for the Head Reader that has an axis located at the centerline of the cylinder that it pivots around. This will allow you to turn the Head Reader easier. Create a shuttle for the top platter. The platter should be Platter.2, the default location of the axis is fine. Show the Case Lid. You are now going to create your simulation using the clash options. Create a simulation using your shuttles. By default the clash detection is off. Select the clash detection (on) icon.

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This will show the clash using red geometry.

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Move the Case Lid down just a little and Insert. You should see the clash appear in red.

Delete that last step. You are now going to begin your simulation. Move the Lid Screws up enough so that you can move the other objects up. Make sure you Insert the move. You may notice that the movement is slower due to the fact that it is computing to check for clash as you move an object. Move the Case Lid up. Make sure you Insert the move. Move the Hex Bolts up and over out of the way. Make sure you Insert each move. Move the Platter up and over out of the way. Make sure you Insert each move. Turn the Head Reader until it is in contact with the Drive Case as shown below. Notice that this is hard to do because it does not stop when comes in contact with the railing, it just turns red. You will try it again using another clash option.

Insert the move and then Delete it. This will reset the Head Reader to its original location. Fitting Simulation - Clash Detection, Page 154

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CATIA Assembly Design Select the clash detection (stop) icon. is encountered.

CATIA® V5R6

This cause the simulation to stop when a clash

Turn the Head Reader again in the same direction until it stops and Insert the move. Make sure you turn it slowly so the calculation can compute or else it may not let you turn it at all. It should appear similar to the diagram shown below.

If you really want a challenge try getting that platter out without clashing. It can be done but you must have a lot of patience. You have to turn it and raise it many times and you have to do it slowly. You do not have to do this unless you just enjoy a good challenge. That introduces you to the clash detection options while simulating. End your simulation and save your assembly.

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Path finder This option allows you to have CATIA determine a clash free path for your simulation. You define the simulation to determine where you want the part to begin and end and then the path finder option will modify the path to be clash free. This option is excellent to determine if an object can fit through a doorway or be installed in a factory layout. However, it is relying on CATIA to determine the path, so it is not perfect and sometimes it is better to use the clash detection options mentioned earlier and do it yourself. Open the Mouse maze assembly. It is located in the Mouse maze directory. It should be similar to the diagram shown below.

It is fairly common to use a maze as a representation of what the path finder can do. It is a simple assembly that is easy to understand yet it stills show how to utilize the feature. This exercise hopefully is enjoyable. The goal is to get the mouse to the end of the maze, there is a lid on the top of the maze that is somewhat transparent. If there was not a lid then the path finder would just pick the mouse up and set it down in the right spot. Create a shuttle for the mouse. The default orientation will work fine. Create a simulation that has a path from the current location to the end location. This can be done with a simple movement of the compass and then turn the mouse to face the right way. You do not need to follow the maze just move it along the bottom plane.

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Select OK to end the simulation. Make sure you Insert the one movement. Select the path finder icon. your simulation.

You should see a Select window appear that contains

Select your simulation and select OK. A Path Finder window appears.

The first field, Simulates, defines what is going to be simulated. If you used multiple shuttles to create your simulation, you can decide what shuttle the path finder will be applied to. The next area defines how the path finder is going to work. Basic Visualization Defines whether or not the motions of the shuttle will be shown or not. There are three options: on, off and strombo. On shows every step. Off does not show any steps. Strombo will show a visualization step every twenty calculations. Steps

Defines the size of step that will be taken between motions. The smaller the step, the longer it will take to calculate a path. The larger the step, the less likely the path finder will be able to find a solution.

Angle

Available if the angle validation was turned on when the shuttle was created. This keeps the shuttle from rotating around that particular axis more than the specified angle.

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Advanced Environment Smallest detail

Defines the accuracy that is used when calculating the motions. The smaller the number, the more accurate the environment but the longer it will take to calculate.

Repulse effect

Controls the translation and rotation effects when it comes in contact or near contact with the environment. Setting it too high will make the shuttle move quickly away from the environment whereas low will allow it to stay close or in contact with the environment.

Translation step

Maximum distance the shuttle will travel before taking a new step.

Rotation gain

This gain is tied to the translation step. If the gain is set to one, then the rotation angle is the same as the translation step.

Motion

Most of the time the default options are sufficient. Under the Basic tab, make sure you have the options set to On and Medium. You are just going to use the default options.

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Select Apply. The path is calculated.

Select OK. The path of the simulation changes to look similar to the one shown below.

Notice that the path is very jagged and it has a lot of steps that do not seem necessary. You will use the smooth option to smooth the path and reduce the number of steps.

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Smooth Select the smooth icon.

The Select window appears.

Select your simulation and select OK. The Smooth window appears.

The options are just like the ones discussed with the Path Finder window. Change the Translation step to 1 inch and select OK. This will help to reduce the number of steps in the simulation. Notice the simulation path contains fewer steps and is a lot smoother.

Play your simulation. Notice that the mouse rotates all around and the bottom of the mouse does not stay planar with the bottom of the maze. You will create a new simulation with the Angle Validation on the shuttle so it will not let the z axis rotate around. Delete your simulation.

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Modify your shuttle to use Validation, change the Angle to 0 degrees and the Vector to the Z vector. This will not allow the mouse to rotate the Z axis vector in any given direction. The mouse is free to rotate about the Z axis but the Z axis itself cannot move.

Create a simulation just like you did before, with one step from the beginning to the end. Select the path finder icon. using the angle validation.

You are going to try the path finder again but this time

Use your simulation and the default settings and select Apply. The simulation fails stating that there is no way out.

Select OK in the Error window. Try changing the Steps to Small and then select Apply. It does not work either. Try changing the Steps to Large and then select Apply. It does not work either.

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As you can see the path finder is not the best thing in the world. Delete the simulation. Keep the shuttle that you created for the mouse. Using the clash detection (stop) option, create a simulation of the mouse going through the maze without the z axis rotating. This is easily done if you change to the top view. It should appear similar to the one shown below.

Create a replay and save your assembly.

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Next, you will try the path finder option on getting a couch and fish tank out of a house through the front door. Open the House product. It is in the House directory. For this exercise, you will be removing furniture from the house. As you might already know, getting large pieces of furniture through a doorway can sometimes be difficult. To help with this difficulty, you are going to use the pathfinder option to find a path along a simulation path that does not clash with any other object. Create a shuttle for the Couch. Create a simulation of the couch being moved into the front lawn. Make the compass have the coordinates of -18, 35, and 3 before you insert the step. Do not worry about clashing with other objects. Pathfinder will take care of this for you. Your simulation should look something like the following.

Select OK. This will complete the simulation. Now you will use the pathfinder option to compute the path.

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Select the pathfinder icon. The Select window will display. This is showing you the available simulations that can be used with the path finder. Select the simulation that you just created. Be sure to select OK when done. Select Apply. The couch shuttle will begin to move and work its way around the various objects in the environment. When the path finder is done, you will have a new simulation that has many steps in it. Select OK. Your simulation path will change. All of the steps that the path finder used to get the couch out of the house will be inserted into the simulation.

Now that you have a good path for the couch to follow, you will want to smooth the path up, getting rid of unnecessary steps. Select the smooth icon. This will bring up a Select window that is asking what simulation you would like to smooth. Select the simulation you just created. Select your simulation and then select OK. The Smooth window will display. Change the Translation step to 0.5 and the Rotation gain to 2. This will allow the couch to move a maximum of one-half inch before taking a new step, and allowing it to rotate at twice the rate of the translation step. Select OK. This will have the system calculate the new path. The path that you get after the smooth option runs will be a path that is similar to the one created by path finder but without any extra motions or rotations.

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Play the simulation. Notice the couch will rotate quite a bit about all axes. Sometimes it is necessary to simulate a shuttle that cannot rotate about a particular axes. For example, if you are simulating the removal of the fish tank in the house, you would not want to allow the fish tank to rotate and spill the water and any extra equipment left in the tank. Create a shuttle for the fish tank with an Angle Validation of 2 degrees around the Z vector. This will only allow the fish tank to rotate the Z axis vector a maximum of two degrees in any given direction. The tank is free to rotate about the Z axis but for the Z axis to move itself, it is limited to the two degree restriction. Select OK. This finishes the shuttle. Next, the simulation will be created, then the path finder and smooth options will be applied to the simulation. Make a simulation of the fish tank, moving it outside the house. It will be left to you to determine where you want to move the tank outside the house. Select OK when done with the rough simulation. Select the pathfinder icon and select your simulation. Since you made a rough simulation, you will need to apply the path finder to the simulation. The smooth option will be used afterwards to remove unnecessary steps and rotations. Change the Visualization to Strombo and the Steps to Medium. Select Apply when done. Watch the simulation closely. Notice the fish tank only shows once for every twenty steps. This decreases the calculation time for the path finder. When you are working with a path that is going to take a long time to compute, it is advisable to turn off the visualization or set it to Strombo. The computer can calculate the step much faster than it can display it, so by turning off the visualization or only having the computer display a few of the calculations, it can compute the path much faster. Select OK when done. Select the smooth icon and select your simulation. Smooth the path with a translation step of .5 and a rotation gain of 2. This will generate a simulation path that is much smoother than the one generated by the pathfinder. There is no need to save the house. This ends fitting simulation. You will use some of these options in the DMU Navigator section to animate a viewpoint.

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DMU Navigator Pull down menu changes View

Viewpoint Palette

Opens the viewpoint controller

Scene specification

Turns the thumbnail viewing of scenes on or off along the bottom of the screen

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Insert

Create an Annotated View

Creates a 2D annotated view

Add Hyperlinks

This will allow you to add a link to a part or product. This link will take you to any world wide web address

3D Annotation

Inserts a 3D annotation in to the document

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Tools

Cache Content

If the cache system was being used, this would allow you to view what documents were currently being held in cache.

Replay

Works the same as replay from Fitting Simulation

Backbone Connection

This will establish a connection to the backbone conferencing server. Conferencing is a complicated matter and will not be discussed.

Import N4D Scene

This will import a VRML ( Virtual Reality ) model.

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DMU Navigator workbench Changes workbenches

* Clash detection (on)

Selects geometry

* Clash detection (stop)

Creates a 2-D Annotated view Allows you to manage the 2-D annotated views Allows hyperlinks to be added to the assembly Creates a 3-D Annotated View * Creates a Group from selected parts Creates a scene * Allows previously made shuttles to be simulated * Compiles a simulation into a replay * Lets a replay be viewed * Clash detection (off)

Records a viewpoint animation, creating a replay automatically. Allows you to search through an assembly for a specific object based on particular criteria Displays components in a particular relation to a selected object * Shows the current selected object(s) and relationships with other objects Takes you to a hyperlink that is applied to an object Starts a publishing session Allows a component to be translated or rotated by specified values * Allows you to snap objects to one another

* Denotes this option has already been covered

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Creating an annotated view Draws lines

Creates text

Freehand drawing

Inserts a picture marker

Draws circles

Creates an audio marker

Creates arrows

Removes all annotations

Draws rectangles

Creating a scene Changes workbenches

Allows you to snap objects to one another

Selects geometry Searches for objects Exits the scene Explodes the assembly Restores objects to their original location on the assembly

Starts a publishing session

Saves the viewpoint

Publish

Creates a snapshot Publishes a feature Creates text Creates a VRML file Stops publishing © Wichita State University

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DMU Navigator DMU Navigator will allow you to perform several tasks. When working with complex assemblies, it may be desirable to show the assembly in a partially assembled state or more importantly, it may be necessary to draft an assembly when it is not fully assembled. DMU Navigator allows you to do just that. DMU Navigator also allows you to add additional information with your assembly such as hyperlinks that could point to manufacturer information on the Internet. DMU Navigator also allows you to record viewpoint animations. Open your Compressor Pump product. It is located in your directory. Switch to the DMU Navigator Workbench, if not already there. This can be done by either selecting the change workbench icon in the top right of the toolbar or by selecting Start, Digital Mockup, and DMU Navigator. Some of the icons should look familiar. It is assumed that you understand those icons, therefore they will not be covered in this section. If you are unsure how an icon works refer to the previous sections for review. Creating an annotated view Select the create an annotated view icon. This creates an annotated view. This view is only 2D, meaning, that if you were to rotate the model the view would disappear. You can always call the view back up using the manage annotated views icon. You should notice a set of new icons appear as shown below. Allows you to draw a line

Adds text

Allows you to draw freehand

Inserts a picture marker

Allows you to draw a circle

Creates an audio marker

Allows you to draw an arrow

Deletes all annotations

Allows you to draw a rectangle

Select the draw arrow icon. This will allow you to create an arrow in the annotated view. You need to define the two ends of the arrow. The first end you define is the beginning of the arrow and the second end is the point of the arrow head.

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Create the following arrows. You create the arrow by pressing and holding the first mouse button at the first end location and then drag your mouse to the other end and let go of the button. It should appear similar to the diagram shown below.

Select the add annotation text icon.

You have to define a location for your text.

Select above the left arrow. An Annotation Text window appears like the one shown below.

Change the size to 12 and key Head Bolts for the Text. It should look similar to the window shown above.

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Select OK. The text should appear similar to the diagram shown below. If you the text is not in correct location, select it and drag the little box with the first mouse button that appears at the location you specified.

Using the third mouse button, select on the text and choose Properties from the window. This will allow you to modify the properties of the text. A Properties window appears. Select the Text Properties tab. It should appear similar to the diagram shown below.

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Change the Frame to Frame instead of No Frame and select OK. The text should appear with a rectangular frame around it. This is all you want to create for this annotated view. Rotate your assembly just a little. The view disappears, you will retrieve it later. You should notice the Annotated Views branch appearing in your specification tree. If you want you can create some other annotated views trying out some of the other options. Most of the options are self explanatory. The insert picture marker icon allows you to insert pictures of the following formats: tiff, jpg, bmp and rgb. The create audio marker icon allows you create a wav file but you have to record it right then and you need the right equipment to do that.

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You are now going to learn how you can create your own web page straight from CATIA using the publish option which creates an HTML file. Publish Select the start publish icon. This will bring up a Select Publish File window. An HTML file will be created with the publish icon. Go to your drawings folder, then key Compressor in the File Name field and select Save. This will bring up a small toolbar of Publishing Tools.

Snapshot

Takes a screen shot of the assembly in the current viewpoint.

Feature Publish

Allows you to publish features in your assembly. Features such as simulations, replays, hyperlinks, interference analyses and distance analyses.

Text

Allows you to add any type of text desired into your HTML document.

VRML

Generates a VRML file and inserts a hyperlink in your HTML document to the VRML file.

Stop Publish

Stops the publish session.

Any of these icons can be used in any order. Hide the specification tree. This can be accomplished by selecting the pull down menu View and then Specifications or by pressing the F3 button on the keyboard. This will remove the specification tree so the published images will be more clear.

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Zoom on the compressor until a good isometric view of the compressor is visible, as shown below. Since the snapshot icon takes a screen shot of the workspace, it is advisable to make your assemblies as large as possible in the workspace window.

Select the snapshot icon. This will take a snapshot of the image and put it in your HTML document. Note, there will be no indication that anything has happened. Rotate the assembly as shown below and take another snapshot. Again, no indication that anything has happened will be displayed. This will be the second image inserted into the HTML document.

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CATIA Assembly Design Select the VRML icon.

CATIA® V5R6

This creates a link to a VRML file in your HTML document.

Select the text icon. This will display the Publish Text window. Any text entered into this window will automatically be inserted into the HTML document.

Key Remove the six head bolts. Select OK when done. This text will be inserted into the HTML document. You are now going to retrieve that annotated view you created earlier and then take a snapshot of it. Select the manage annotated views icon. The Annotated Views window appears. It may contain more views then shown if you practiced creating them earlier.

Select View.1 and select OK. The display should change to the annotated view that you created earlier. Select the snapshot icon.

This inserts that picture in your HTML document.

Rotate your assembly a little. This will get you out of the annotated view. Select the feature publish icon.

You will need to show your specification tree.

Select the Pulley Removal simulation from the tree. This inserts that information in your HTML document. You will not notice anything happening.

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Select the feature publish icon. Select the Pulley Removal replay from the tree. This inserts that information in your HTML document. You will not notice anything happening. Select the stop publish icon. This ends the publish session and creates the HTML document. Next, a hyperlink will be created to go to the document.

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Hyperlinks Select the add hyperlinks icon. This will allow you to add an URL or Internet address to components of your assembly. These URL links can be links to other web sites within your company or to vendor web sites. You can also add links to other types of documents. For example, if you have a specific technical document that is associated with your part, then you can associate that document to your part. Select the Air Compressor from the specification tree. The air compressor is the very top branch in the tree. Since the HTML document was made for the whole air compressor, it is suited for the hyperlink to be attached to the whole air compressor. The Manage Hyperlink window displays.

Change the Name to Published Document. This will give the hyperlink a more descriptive name. Select the Browse... button. This will bring up the Link to File window. If not already there, change the current directory to your drawings folder. Select Compressor.html and then Open when done. This is the document that was just created in the publish. This will add the path to the list area under Link to File or URL. Several files or documents can be added to the hyperlink. Select OK. This will insert a hyperlink in your assembly. You should notice a Hyperlink branch in your specification tree.

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Select the go to hyperlinks icon and select the Air Compressor assembly. This will launch a web browser and display your published document. Look the document over. When done, close the web browser.

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3D Annotation You will now create a 3D annotation on your assembly. This is a good way to communicate to other designers who will look at this assembly. In this case you are going to specify that a particular part needs to have stress analysis applied to it. Select the 3D annotation icon. annotation attached to.

You have to select an object that you want the

Select the green cylinder head. The Annotation Text window appears. This is the same window that appears when you created text in the annotation view.

Key Needs stress analysis performed. Select OK. The text appears on your assembly as shown below.

Rotate your model. You should notice that the text always remains readable.

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Next, a few scenes will be generated. Scenes - basic Select the scenes icon. name for the scene.

This will bring up the Edit Scene window that is asking for a

Change the name to Internal Components. Select OK when done. The background and toolbar will change. This is to denote that you are in the scene and not just the regular workbench. Most of the options are ones that you have used before. Changes workbenches

Allows you to snap objects to one another

Selects geometry Searches for objects Exits the scene Explodes the assembly Restores objects to their original location on the assembly

Starts a publishing session

Saves the viewpoint Within scenes, you can manipulate the model in any form you feel necessary. The manipulation is only stored with the scene, leaving the original assembly as it was. This is great for creating technical documents.

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Hide all of the outer casing as well as all of the bolts and pulley. This will be the viewpoint that is to be saved in the scene.

Hide the specification tree. If you do not then the scene will contain the specification tree. Select the save viewpoint icon in the toolbar. This will update the scene and it is what will be displayed the next time the scene is viewed. Select the exit from scene icon. This will take you back to the assembly as it was when you entered the scene. You will also note the scene picture in the bottom left corner of your screen. This is the pre-visualization of the scene. You can turn the display of those by using the F4 key on your keyboard or by using the pull down menu View, Scene specification. A new scene will be generated, this time you are going to alter the display before you enter the scene workbench.

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Search Select the search icon. This will bring up the Search window. Used properly, this feature can be quite useful. Search allows you to multi-select elements through various methods. Make sure you switch to the General tab.

A * in the field denotes that all entities of that category will be searched. You will use the search to select all the .375 Hex bolts. Key *.375*hex* in the Name field. This will tell the search feature that you are looking for any string that has the number .375 and the word hex in it. Select the Search button. This will search through the entire air compressor document for anything that matches the search string. Notice in the results area that more than just the parts themselves are found. This is not what you wanted. You only wanted the parts to be found instead of all the parameters too. Select the drop down for Workbench and select Assembly Design. Select the drop down for .Type and select Product. You choose these two selections so that you will select the bolts from the assembly only. Select the Search button again. This time, eight objects are found and they are only the parts and not all the part parameters. Select the Select button at the bottom of the Search window. This will select all of the .375 Hex bolts that it found. Select OK. This will close the search window, keeping the bolts selected.

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Current selection panel Select the current selection panel icon. This will bring up a window that will show just what is selected. This feature can be quite useful when more than what you wanted was selected in a search or proximity query selection. This will show you what else was selected.

Select the 3D tab, if not already there. This will show you graphically the bolts that are selected. Notice where the other two bolts came from. They are from within the compressor. Close the Current Selection Panel window and hide the bolts. You can close the window by selecting the X at the top right corner of the window and you can hide the bolts by selecting the hide/show icon. Next, a proximity query will be used.

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Proximity query Select the proximity query icon. The proximity query will select objects that are in relation to the selected product. The Proximity Query window appears.

Select the Cylinder Head. This will define what component will be used as the base or starting point for the proximity query. Change the Accuracy to .025. This will set the maximum distance to approximately .15 inches. Anything that is further than .15 inches away from the cylinder head will not be selected. Make sure the Products to select is set to Nearby products including selection and select Apply. The proximity query will generate 3dmaps of all the products and then analyze them for distances away from the cylinder head. This may take a some time. Notice all the hex bolts that were just hidden are also selected. Select OK and hide the selected objects. This will hide the cylinder head and the compressor head. Hide all the aqua hex bolts. It is left to you to determine how you want to select all of them or if you even want to use a multi selection tool at all.

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Translation or rotation Select the translation or rotation icon. This icon will allow you to translate or rotate a selected object any distance or rotation angle entered. You can also define the exact position you want the part in relation to the assembly axis.

Select the Pulley and set the Offset X to 10. This will define what is to be moved and how far it is going to be translated. Select Apply. This will move the pulley ten inches from where it was. Select one of the Drain Plugs. Next, the drain plugs will be translated out. Notice that the 10 inches in Offset X is still there. Change the Offset X to 0 and the Offset Y to -12. Select Apply when done. The drain plug will move away from the base. Select the other drain plug, change the Offset Y location to -15 and select Apply. Select OK when done. This will finalize the translations. Hide the 3D annotation.

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Scenes - advanced Rotate the model as shown below and create a scene. Call the scene Long Block. The scene will automatically look like the workspace. Be sure to exit the scene when done.

Go back to the assembly design workbench. Notice that the assembly reassembles itself based on the constraints that have been applied. Show all of the objects.

Navigator - Scenes - Advanced, Page 190

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Double select the Long Block scene that is located in the lower left corner. Notice that when you go in to the scene that the drain plugs and the pulley are back at their original locations.

Use the compass to drag the pulley and the two drain plugs out. You have to place the compass on the object then it should turn green allowing you to drag the object. After you drag the first element you need to take the compass off the element and then deselect the element. Then you can place the compass on a new object. Exit the scene and go back in to it. Notice that the scene now keeps the objects separated. Select the Pulley and then the reset the selected products icon. move the pulley back to the location it is on the assembly.

This option will

Exit the scene and save your assembly. Congratulations, this completes this portion of the DMU Navigator. Next, fly mode will be investigated.

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Navigator - Scenes - Advanced, Page 191

CATIA Assembly Design

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Fly mode Fly mode is an integral part of DMU Navigator. Although you are going to use it with DMU Navigator, fly mode can be activated in any workbench. Even though fly mode will be covered with assemblies, it is still possible to use fly mode with individual parts as well. Open the Track document from the Fly Throughs directory. This is a short track that will get you working with the fly mode.

The first obstacle you will have to overcome is working in perspective mode rather than parallel. By default, parallel mode is current. Perspective mode will make the CATIA world feel and look more like the real world. The further away from you the geometry is, the smaller it becomes. Select pull down menu View, Render style, and Perspective. Notice the back of the track becomes much smaller and the front seems to grow somewhat. This is the perspective view being applied. If you tried to go to fly mode without being in perspective mode, it would switch you automatically.

Navigator - Fly Mode, Page 192

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Rotate and position your viewpoint to the start of the track. Your screen should look something like the picture below. The start of the track is considered to be where the gap is.

Up until now, you have worked in examine mode. It is time to now switch to fly mode. Select the fly mode icon. This icon is along the bottom toolbar. You will notice a few toolbar changes. Take a closer look at them.

Turn Head

This icon simulates you turning your head in the workspace. The same effect can be done by pressing button two and then button one on the mouse.

Fly

This icon enters you into flight. The same effect can be accomplished by selecting button two, then tapping button one.

Accelerate & Decelerate

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These two icons will accelerate your flight or decelerate your flight. A better method to speed up and slow down your flight is by pressing the Page Up and Page Down keys on your keyboard.

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Entering flight mode, your will have the following symbols appear on your screen.

1) This is your target

Your cursor will turn into a small hollow arrow. The closer to the center of the target you move the cursor, the straighter your flight path will be. The opposite is also true, the further away from the target you move the curser, the sharper the turn will be.

2) This is your direction pointer

This green (or red) arrow will grow as you move faster or shrink as you move slower. The arrow will also rotate and corner as your mouse moves away from the target.

3) This is your speed

This is a numerical visualization of how fast or slow you are going.

Even though this may seem like a lot at the current moment, things will become more clear as you work with the fly mode more. Rotate your viewpoint around. This can either be done by selecting the rotate head icon and then using the first mouse button to rotate it or by pressing button two and then one to rotate your head around. The effect you see should seem as though you were looking side to side in the workspace. Be sure to rotate your viewpoint back to the original position before continuing. Now try your hand at flying.

Navigator - Fly Mode, Page 194

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Start flying. This can be done by selecting the fly icon or by pressing button two and then tapping button one. Most likely, your fly speed will start out very slow. You can increase your flight speed by pressing the Page Up key on the keyboard. As you start flying through the track, move your mouse away from the target. Notice the direction arrow follows your mouse pointer as it moves away. You should also see your pointer change colors from green to red or vice versa. This is an option that can be turned on or off. What the red pointer is showing is your viewpoint clashing with the geometry. When flying through a straight portion of the track, hold down the Shift key on your keyboard and move your mouse left or right away from the target. You will notice the direction pointer and your viewpoint beginning to roll. Holding down Shift rolls your viewpoint instead of yawing or turning it. Continue navigating the track, slowly increasing your speed. The more you fly, the more comfortable you will feel about controlling your viewpoint. Work with flying until you can comfortably fly your viewpoint about the track at a speed of 3 to 4. There are two other fly through documents in the same folder (Fly Through 2 and 3). Try your hand at flying through some of them. When you begin to feel more confident about flying continue on.

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Navigator - Fly Mode, Page 195

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Viewpoints You now are going to be working with viewpoints. You can store these viewpoints by using cameras and then you can move the cameras around. Open the House product from the House directory. This is a basic house that you will be flying through and exploring. If you are not already there, switch to the DMU Navigator workbench and make sure your render style is set to perspective. Before attacking the flying around the house, a different aspect of navigation will be investigated. Cameras will be added in and around the house to give different still images. Cameras can be very useful to point out specifics of an assembly or part. Move the viewpoint until you can see the whole house, yard, and fence. This will give a good overview of the house you are going to be flying through.

Select pull down menu View, Named Views... This will bring up a Named Views window of all the still viewpoints or cameras. You will note there are already several cameras defined. These are the default cameras in CATIA. The cameras you add will have a symbol displayed on the screen as well as being listed in the list of Named Views.

Navigator - Viewpoints, Page 196

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Select the Add button. This will add a new camera to the list of pre-defined cameras. Change the name of the camera to Overview. This will give you a more descriptive name. Select the Properties button from the Named Views list. From here you can control the camera specifics a bit more closely.

Type

This controls what type of camera you are creating. There are two choices, parallel or perspective.

Origin

This defines where the origin of the camera is. This is basically where the camera is situated in relation to the rest of the workspace.

Target

The target defines what is being focused on. Changing the target location changes the direction of the camera.

View Angle

This defines the angle or area that is being viewed. More of the workspace is displayed as the angle gets larger.

Select OK to the Camera Properties and Named Views windows. No changes will be made directly to the camera at this point. Zoom out and around a bit. Notice the new icon on the screen.

This is your camera representation icon. Selecting this icon will show the camera manipulators (two green dots and lines on each end). The green dot on the sharp end is the origin location. The green dot on the open end is the target location. These locations are the same as what you saw in the Properties window. Hide the camera. This will hide the camera symbol and allow you to reframe the window without having it zoom way out.

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Next, a few cameras will be made to show the interior of the house. Fly or manipulate the viewpoint until you are looking into the largest bedroom. You should find this very difficult to do. When you do get in there, you will find that everything is zoomed in close. If you were trying to get a good view of the room size and layout, this would not work very well. Select pull down menu View, Viewpoint Pallete... This is a viewpoint controller. Take a closer look at the capabilities of this window.

The Translate field controls the position of the viewpoint. Remember, your viewpoint is very similar to a virtual camera. You can move that camera around the CATIA workspace just as you would in real life. If you select the target icon it will change the translate palette. You should notice all of the arrows reversing themselves. With the arrows pointed inwards, you are modifying the viewpoint to any one of the default views (front, left, right, rear, etc.). Selecting the target icon again turns the arrows back outward, just as shown above. The amount that the viewpoint is translated is controlled by the numeric field just below the translate icons. When the arrows point outward, you are translating the camera about the workspace. The Rotate field works similar. When the center icon is a ball you are rotating the geometry about the target in your workspace. Selecting the ball icon will change it to the target icon but the rotation icons will remain unchanged. When the target icon is shown, the assembly will rotate about the target of your workspace. Again, you can change the rotation angle by changing the numeric field below the rotate icons. Just below the translate and rotate fields are the Eye and Target locations. This is very similar to the origin and target fields of the camera properties. The target that keeps getting mentioned is the rotation center of your model. When you activate the virtual trackball (by pressing button two and one on the mouse), you get a set of rotation axes that appear at the center of the ball. This is the target. Navigator - Viewpoints, Page 198

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The next field is the Viewing Distance and View Angle. The viewing distance is partially controlled by the eye location. This distance defines how far you are from the target. The view angle controls the width of your vision. The larger the angle, the more you can view. Note: just as with a standard human eye, it is limited. If you set the view to a large angle, 160° for example, the workspace will appear comical. Setting the angle to a small angle, 2° for example, you only see a very limited area. Change the Eye, Target, and View Angle to have the values as shown in the following image.

The reason you do not change the Viewing Distance is because it will automatically update for the eye and target location. This should give you a nice isometric view of the bedroom.

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Without moving the viewpoint, select menu View, Named Views... You are going to add a new camera to portray this position. Select Add and name the camera Master Bedroom. If the viewpoint changes, do not worry, it can be fixed. If the viewpoint changes select the Properties button, then Apply on the Camera Properties window. This will apply the viewpoint to the camera. Your viewpoint should turn back to what it was before starting the camera. Select OK on the Camera Properties window as well as the Named Views window. This will create the camera. Create a new camera position for the following viewpoint. Your viewpoint does not have to look exactly like what is shown below, just something close will suffice. Remember, once you are in the correct position, add a new camera, name the camera, select the Properties button, then Apply, and then select OK to everything to finish adding the camera.

Switch back to the Overview camera. This can be accomplished by selecting View, Named Views and selecting the named view Overview and then selecting Apply. The viewpoint will animate around until it reaches the Overview camera position. Don’t forget to select OK when done.

Navigator - Viewpoints, Page 200

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Change your view angle to 10. This can be accomplished by selecting View, Viewpoint Pallette, and changing the view angle. Be sure to select Close when done. Now, you will take a closer look at flying and recording your viewpoint. Select the record viewpoint icon. This icon will record the viewpoint into a replay. This icon also brings up a few new icons.

Record

Begins the recording of your viewpoint. As soon as you select this icon, a window will display asking what name you want to give the replay. After that, any movements you make of the viewpoint are going to be recorded in the replay.

Pause

Pauses the recording mid stream. Selecting this icon again will start the recording again.

Stop

Stops the recording. Only select this icon when you are finished with the viewpoint simulation.

Status

Shows a green light when the recording is stopped, yellow when it is paused, and red when it is recording. This is only a status icon and has no effect if you select it.

Select the record icon. the replay.

Before the recording starts, a name needs to be defined for

Change the name of the Replay to Outside. Select OK when done. This will give it a descriptive name. Once you select OK the recorder starts. Record a viewpoint animation of you flying around the outside of the house. Press the stop icon when finished. It’s important that you do not make a lot of unnecessary motions. Select the replay icon. comes up by default.

Since the Outside replay is the only replay in the document, it

View your replay. Notice the Animate viewpoint checkbox is turned on. If the checkbox is turned off, then your viewpoint will not animate.

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Create a recording of you flying through the house from the front door to the back door. Remember, to create a new recording, you will have to select the record viewpoint icon, then give the replay a name (Through House) and then record the fly through. Sometimes recording an elaborate viewpoint animation can be very difficult when flying using the fly through icon. Next, a somewhat different method will be used to create a viewpoint animation. Move your viewpoint to a location in front of the house, beyond the end of the sidewalk. A new camera is going to be created from here. After the camera is created, you will use that camera to make a simulation. Create a new camera called Moving Camera. This will be the camera that you will animate. Remember, to create a new camera, you have to use pull down menu View and Named Views. Select the simulation icon. Notice all the cameras you have created are available to be simulated without creating a shuttle first. This is because the camera is not a geometric entity but an application entity. Select the Moving Camera and then OK. The Preview window will show just a picture of the camera symbol. You should also notice the camera becoming quite large. This is showing you the view region of the camera. Note the compass attaching itself to the camera. You will be using the compass to manipulate the camera. Move the camera closer to the door of the house. Select Insert on the Edit Simulation window when done. You do not want the Animate viewpoint checkbox turned on. Turning that option on will animate the viewpoint of your screen as you move the camera. Notice you cannot tell what the camera is looking at. Select pull down menu Window, Camera Window, Moving Camera. Pull down menu Window controls any open windows within CATIA. The Camera Window option shows all cameras that you have created. You should have noticed that the screen changed to the viewpoint of the camera. This is not too helpful because you need to move the camera around. Select pull down menu Window, Tile Horizontally. This should tile the two windows that you have open, the camera window and the house window, one on top of the other. If this does not happen, the house window may be minimized at the bottom of your workspace. Just open the window up and select the pull down menu again. With the two windows, you can now move the camera in the house window while viewing the results of your move through the camera window.

Navigator - Viewpoints, Page 202

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From the House.CATProduct window, move the camera until it passes through the door. Be sure to press Insert every few motions or turn on Automatic insert. You may find it difficult to control the camera with the compass attached to the front of the camera viewpoint. By selecting the red dot on the compass, you can drag the compass to the back point or eye of the camera. This should make things easier for you to control. Be sure to watch your camera window. It will automatically update with any motions that the camera makes. Simulate the camera moving throughout the house, looking in the rooms. Name the simulation Camera Fly Through and select OK on the Edit Simulation window when you are done. Where you go in the house is up to you, the main point of the exercise is for you to understand a different method to generate a fly through. Compile the Camera Fly Through into a replay. Be sure to review your results when done. If you close the Moving Camera window you will see nothing animate except the camera symbol. In order for you to view the camera fly through, you will have to have the Moving Camera window active and visible. Save your assembly. Congratulations, this completes the DMU Navigator.

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Practice Problems Sawhorse All of the parts for the sawhorse can be found in the Sawhorse directory. Assemble and constrain the sawhorse so that an explode can be performed, and all the pieces return to the proper positions.

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Puzzle All of the puzzle pieces needed can be found in the puzzle directory. There is also an animation file in the Puzzle directory that shows the puzzle being diss-assembled. Create a simulation that shows the puzzle being taken apart.

Assembly Design, Page 206

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Mouse Trap All of the parts for the mouse trap can be found in the Mouse Trap folder. Constrain the assembly so that it will return together when exploded. It is up to you to determine what constraints are necessary, and where the assembly will be free floating ( IE: the Holder will not have a constraint holding it in any particular position ). There is also a short AVI file in the Mouse Trap folder that you can view to see the dismantling of the mouse trap.

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CATIA Assembly Design

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Hard Drive All of the parts needed for the hard drive assembly can be found in the hard drive folder. The assembly is shown in two different steps. It is left to you to decide if you want multiple sub assemblies, or one large assembly. Be sure to create a fitting simulation of the hard drive being assembled.

Assembly Design, Page 208

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Pen Any part needed for the pen assembly can be found in the pen folder. Assemble the pen, then create a fitting simulation of the pen being put together, for instructional purposes.

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NIAR Third Floor This is a drawing of the third floor of NIAR. The model can be found in the NIAR directory. Generate a fly through of this model that takes you from the elevator ( the yellow area ) around through the CAD/CAM Labs ( blue colored walls ). It is up to you to determine if you want to fly through the building, or create a camera and simulate it flying through the building. .

Assembly Design, Page 210

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Robotic Arm All of the pieces required for the robotic arm are in the Robo Arm folder. There are no hydraulic cylinders provided. It is up to you to use your various analysis skills to determine the necessary sizes of hydraulic cylinders, and to draw and constrain them properly in the assembly.

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