Principle Parts of a Lathe

This Powerpoint is presented by Waihylan Lin at Technological University (Mandalay), Myanmar.

1. PRINCIPLE PARTS OF A LATHE PRESENTED BY MG WAIHYLAN LIN 2 ND YEAR, MECHANICAL ENGINEERING TECHNOLOGICAL UNIVERSITY ( MANDALAY ) MECHANICAL ENGINEERING DEPARTMENT

2. OUTLINE OF PRESENTATION 1. Introduction 3 2. Lathe machine Figure 4 3. Types of lathe 5 4. Working principle 6 5. Principle parts of a lathe 7 6. Bed 8 7. Headstock 9 8. Tailstock 10 9. Carriage 11 10. Feed mechanism 12 11. Size of lathe 13 12. Specifications of lathe 14 13. Conclusion 15 References

3. INTRODUCTION The lathe is one of the earliest machine tools, is also known as “Mother Machine Tool”. A lathe is a machine tool which rotates the work piece on its to perform various operations such as facing, turning, drilling, threading, knurling, and boring etc. Lathes are used in woodturning , metalworking, metal spinning.

4. LATHE MACHINE

5. TYPES OF LATHE Speed Lathe Engine or Centre Lathe Bench Lathe Tool Room Lathe Capstan and Turret Lathe Automatic Lathes Special Purpose Lathes The various types of lathe commonly used in workshop are:

6. WORKING PRINCIPLE The lathe is a machine tool which holds the workpiece between two rigid and strong supports called centers or in a chuck or face plate which revolves. The cutting tool is rigidly held and supported in a tool post which is fed against the revolving work. The normal cutting operations are performed with the cutting tool fed either parallel or at right angles to the axis of the work. The cutting tool may also be fed at an angle relative to the axis of work for machining tapers and angles .

7. PRICIPLE PARTS OF A LATHE The principle parts of lathe are: Bed Headstock Tailstock Carriage Feed Mechanisms

8. BED Bed is the baser or foundation of the lathe. It is heavy, rugged and single piece casting made to support the working parts of the lathe. There are two sets of guide ways, (1) Outer ways and (2) Inner Ways. Outer ways is for the carriage and the inner ways for the tailstock.

9. HEADSTOCK Headstock is fastened on the inner ways at the left side of the bed. T he headstock spindle, a hollow cylindrical shaft supported by bearings, provides a drive from the motor to the working holding device. A live center and sleeve, a face plate, or a chuck can be fitted to the spindle nose. Spindle nose may have threaded design or flanged type.

10. TAILSTOCK Tailstock is situated on the inner ways at the right hand end of the bed, can be moved towards or away from the operator. It can be locked in any position along the bed by tightening the clamp lever or nut. Tailstock spindle is a hollow tapered shaft, can be used to hold the dead center. Tailstock hand wheel is used to move the tailstock spindle in or out of the tailstock.

11. CARRIAGE Carriage controls and supports the cutting tool, move to away towards the headstock. It have five major parts: Saddle – H-shape, slides along the ways between the headstock and tailstock. Cross Slide – fits over the saddle dovetail, provides the cross movement to the cutting tool. Compound Rest – can be swiveled to any angle for taper turning operations. Tool Post – clamps the turning tool or cutting tool. Apron – can be turned by hand to move the carriage along the bed of the lathe.

12. FEED MECHANISM The movement of the tool relative to the work is termed as feed. Three types of feed are: Longitudinal feed – the tool moves parallel to the work i.e. towards or away from the headstock. Cross Feed – the tool moves perpendicular to the work i.e. towards or away from the operator. Angular Feed - the tool moves at the angle to the work. It is obtained by swiveling operated.

13. SIZE OF LATHE Height of centers over bed. Maximum swing over bed. Maximum swing over carriage. Length of bed. Maximum length of the work, can be accommodated between the lathe centers. Maximum diameter of the work, can be accommodated in a gap bed lathe.

14. SPECIFICATIONS OF LATHE The length, with and depth of bed. Height of centers. The number of feeds and the number and range of spindle speeds. The lead screw diameter. The back gear ratio. The number and range of metric threads that can be cut. The power rating of electric motor. The tailstock spindle travel.

15. CONCLUSION To know about Principle Parts of a Lathe. To know about Engineering subject. How to different Principle Parts of a Lathe.

16. REFERANCES www.slideshare.net Workshop Technology Text Book

17. Thank You