Caed Chapter No1

Computer Aided Engineering Drawing

Introduction to AutoCAD Chapter No 1 Sir Syed University of Engineering & Technology Computer Engineering Department University Road, Karachi-75300, PAKISTAN

CAED - Chapter No 1

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Text Book  Text Book:

By

Mastering AUTOCAD 14 George Omura

 Course Outline is available at CAED course

website.

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Course Outline  Introduction to AutoCAD for Windows  Overview of AutoCAD, Program Files, File Extension, Drawing Editor in AutoCAD  Basic Concept of AutoCAD  Co-ordinate System, Drawing Aids, Display Control, Limits command  Entity Draw Command in AutoCAD  Line, Point, Circle, Arc, Ellipse, Donut, Polyline, Polygon, Sketch, Text  Editing Tools in AutoCAD  Erase, Move, Fill, Break, Rotate, Divide, Scale, Mirror, Extend, Fillet, Chamfer, Array  Advanced AutoCAD Commands & Concepts 

Hatch, BHatch, Printing, Dimension, Layer, Blocks, 3D Drawing

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Computer Aided Engineering Computer Aided Engineering (CAE)

Computer Aided Design (CAD)

Computer Geometric Modeling

Computer Aided Manufacturing (CAM)

Computer Aided Drafting

Finite Element Analysis

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Overview of CAD  CAD stands for Computer-Aided Design.  Computer Aided Design (CAD) is the latest

breakthrough in the modern technology that became a part of variety of professionals like Engineers, Architects and Interior Designers.

 CAD helps in the presentation of Engineering

Drawings, Architectural Drawings, Interior Designs, Work-flow charts, Organizational Diagrams and Company logos etc.

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Overview of CAD  AutoCAD is a general purpose computer aided

drafting application program designed for use on single-user, desktop personal computers and graphic workstations.

 An AutoCAD drawing is made up of entities. These

can be either simple graphic primitives (such as lines, arcs, circles, text, and so on) or blocks (which are groups of entities). A block is a group of entities that can be manipulated as a single unit.

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Overview of CAD  Designs and drawings can be standardized

and more accurately presented by using AutoCAD.  Drawings drawn on AutoCAD can also be

transmitted to CAM (Computer Aided Manufacturing) system for the actual production of the product design.

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Overview of CAD  An AutoCAD drawing is made up of objects.

These can be either simple graphic objects (such as lines, arcs, circles, text, etc.) or blocks (which are groups of objects).  Each object also has certain attributes

associated with it, such as line style, text font, or colour.

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Overview of AutoCAD R14  AutoCAD R14 for windows provides a

Graphical user Interface (GUI) similar to that of any other windows package that further simplifies access to commands.

 Pull-down menus, dialog boxes, scroll bars

and command icons adhere to Windows standards. The open architecture of this product makes it much easier for the developers to create new applications that can run with AutoCAD.

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Advantages of AutoCAD  Generation of graphic images on a computer  Modification of graphic images on a

computer  Printing these images as a hard copy by a printer or a plotter  Retrieval of designing information

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Advantages of using computer over paper work  Easier creation of the drawing  Easier correction of the drawing  Easier visualization of the drawing  Increase the accuracy of the drawing  Increase the life of the drawing  Drawing can be stored and easily

referenced for the further modification

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Hardware and Software Requirements for AutoCAD  Minimum IBM compatible 80386 computers  At least 64MB of RAM. AutoDesk     

recommend at least 128 MB. Hard disk with at least 50MB or more space. One floppy Drive Digitizing tablet or mouse Printer or plotter A video display adapter (VGA) that is capable of displaying Windows 12

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The Program Files in AutoCAD Number of subdirectories are present in AutoCAD’s directory.

 ADS (AutoCAD Development System): Files contain in this directory are programs and sample codes for ADS.  API (Application Programming Interface): Files in this directory are for programmers interested in linking applications to the Advanced Modeling Extension like Access 7, Excel, and FoxPro. 13

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The Program Files in AutoCAD  ASE (AutoCAD SQL Extensions): Files in this directory are for database programmers interested in linking AutoCAD drawings to the SQL servers.

 Fonts: Contain the standard font-definition files.

 Sample: Contain the sample drawing and AutoLisp programs. 14

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The Program Files in AutoCAD 

Source: Contain the ASCII source file for many of the support files.



Support: Contain the files that support variety of AutoCAD’s functions such as linetype, fonts and pattern etc.



Tutorial: Contain the sample files used in conjunction with the tutorial that appear in various AutoCAD manuals. 15

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Ways of Entering Commands  Command Entry  Data Entry  Entity Selection

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Ways of Entering Commands  Command Entry:

All the commands can be entered from the keyboard, screen menu, pull-down menu or from the button menu.  Data Entry:

When the command is invoked, a user has to supply additional information to specify how, where or upon what the requested action should be performed. A user responds to AutoCAD by entering numeric values, specifying angles and distances. 17

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Ways of Entering Commands  Entity Selection:

One or more entities can be selected for processing. This collection of entities (just clicking) or remove entities from (shift+click), the selection set. AutoCAD highlight the selected entities using dotted lines

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Drawing Editor in AutoCAD

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AUTOCAD Command Line Area  The command line area is located by default

at the bottom of the AutoCAD application window, just above the status bar.  This is the area where AutoCAD prompt you the next step in a command sequence the three lines in the command: line area display the three most recent prompts and command, with the current one of the bottom line.  The current command line separated from the others by horizontal line. 21

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Setting Up The Initial Drawing Area

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Drawing Aids Dialog Box  The Drawing Aids dialog box enable you to

specify several setting of the drawing area.

 The snap area enables you to specify the

incremental movement of your cursor across the drawing area.

 In the grid area, you can specify the spacing

of the grid dots displayed within the drawing limits

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File Format in Auto CAD  When starting from scratch AutoCAD doesn’t

need a file name for the drawing. (all drawings have an extension of DWG).  After you have specified the name of the

drawing using the Save Drawing as dialog box, AutoCAD will automatically save the drawing under the current name without opening a dialog box. 24