Turret Lathe 1

Course Number: IPE-112

Experiment Number: 01

Study and operation of Turret lathe machine including coolant and lubrication system

…………………………………………………… …………………………………………………… …………………………………………………… …………………………………………………… …………………………………………………

Study and operations of turret lathe Objectives:  To see the Turret Lathe  To learn about specification of turret lathe  To know how to use turret lathe  To learn about the applications of turret lathe  To learn about the coolant and lubrication system

Introduction: The turret lathe is a form of metalworking lathe that is used for repetitive production of duplicate parts, which by the nature of their cutting process are usually interchangeable. It evolved from earlier lathes with the addition of the turret, which is an indexable toolholder that allows multiple cutting operations to be performed, each with a different cutting tool, in easy, rapid succession, with no need for the operator to perform setup tasks in between, such as installing or uninstalling tools, nor to control the toolpath. The latter is due to the tool path’s being controlled by the machine, either in jiglike fashion, via the mechanical limits placed on it by the turret's slide and stops, or via electronically-directed servomechanisms for computer numerical control (CNC) lathes.

Discussion: Types of turret lathe: There are mainly two types of turret lathe: i. Horizontal ii. Vertical Each group can be divided into some types as: i. ii. iii.

Ram type Saddle type Automatic chucking machine

Turret lathe components: Different parts of turret lathe are:      

Headstock Cross-slide tool post Hexagonal turret Turret saddle Feed rod Saddle for cross-slide.

Headstock: The headstock is a large casting located at the left hand end of the bed. The headstock of capstan and turret lathe may be of the following types: i. ii. iii. iv.

Step cone pulley driven headstock Direct electric motor driven headstock All geared headstock Pre optive or pre selective headstock.

Turret saddle: The turret is the hexagonal tool holder intended for holding six or more tools. The centerline of the each hole is perfectly aligned with the axis of the lathe when aligned with the head stock spindle. In addition to these holes, there are four tapped holes on each face of the turret for securing different tool holding attachments. After one operation is completed, as the turret is brought back away from the spindle nose, the turret index automatically by a mechanism incorporated on the bed and in turret saddle, so that the tool mounted on the next face is aligned with the work. Saddle for cross slide: Turret lathes equipped with usually two designs of carriage:  Conventional type carriage  Side hung type carriage

Working principle of turret lathe: Turret lathe is used for production purpose. There is a work holding device called turret instead of tailstock. It can hold eight tool at the same time. Firstly we should think that what processes can be used for manufacturing something. Then we should settle tool for manufacturing it. Then we can do the processes one by one.

Work holding device: The standard practice of holding work between two centers in an engine lathe finds no place in a capstan or turret lathe as there is dead centre to support the work at the other end. Work is, therefore supported at the spindle end by the help of chucks and fixtures. The usual methods of holding work in a capstan or turret lathe are 1. Jaw chuck: I. Self centering chuck II. Independent chuck III. Combination chuck IV. Air operated chuck 2.

Collet chuck: I. Push out type II. Draw in type III. Dead length type

Turret lathe specifications: i.

Spindle speed: 780 rpm

ii.

Type of chuck: Collet chuck

iii.

Diameter of chuck: 22 mm

iv.

Metal of workpiece: Brass

v.

Drill bit dia: 6.5mm

Conclusion: We have learned to use engine lathe before. But if we want to use lathe in production purpose then we can’t use engine lathe. Turret lathe is a production purpose lathe. We have learnt about turret lathe in this experiment. We have also learnt about the lubrication and coolant system.

Assignment 1.Question: What is the difference between turret lathe and engine lathe? Answer:  In engine lathe there is only one tool holder. But in turret lathe there is more tool holder.  Two or more cuts can be done at a time in turret, but in engine lathe it is not possible.  The tool post of turret lathe can be indexed by 90°, but in engine lathe it is fixed.

2.Question: What is the field of application of turret lathe? Answer  It is more rigid and hence suitable for heavier chucking work. Jobs upto 300 mm diameter can be machined on it  Its design eliminates the turret slide overhang problem inherent in the ram type lathe.  The power rapid traverse reduces the operator’s handling effort.

3.Question: How do the engine lathe and turret lathe compared as per as quantity of production is concerned. Why? Answer: The engine lathe and turret lathe compared as per as quantity of production by their tool post. Engine lathe have only one tool post and it is fixed. In the other hand, turret lathe have eight tool post usually. 4.Question: Why hexagonal turret is used instead of tailstock in a turret lathe? What are it’s advantages over others? Answer: Hexagonal turret is used instead of tailstock in a turret lathe because the turret has eight tool post and so that mass production can be achieved. 5.Question: What is the difference between ram type and saddle type turret lathe? What are the advantages and limitations? Answer: 6.Question: why the turret lathe will be suited to repetitive manufacture of complex cylindrical parts? Answer: