principle parts of a lathe
TRANSCRIPT
PRINCIPLE PARTS OF A LATHE
PRESENTED BYMG WAIHYLAN LIN
2ND YEAR, MECHANICAL ENGINEERING
TECHNOLOGICAL UNIVERSITY (MANDALAY)MECHANICAL ENGINEERING DEPARTMENT
OUTLINE OF PRESENTATION1. Introduction3
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
INTRODUCTIONThe 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.
LATHE MACHINE
TYPES OF LATHE
Speed LatheEngine or Centre LatheBench LatheTool Room LatheCapstan and Turret LatheAutomatic LathesSpecial Purpose Lathes
The various types of lathe commonly used in workshop are:
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.
PRICIPLE PARTS OF A LATHEThe principle parts of lathe are:oBedoHeadstockoTailstockoCarriageoFeed Mechanisms
BEDBed 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.
HEADSTOCKHeadstock is fastened on the inner ways at the
left side of the bed.The 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.
TAILSTOCKTailstock 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.
CARRIAGECarriage 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.
FEED MECHANISMThe 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.
SIZE OF LATHEHeight 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.
SPECIFICATIONS OF LATHEThe 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.
CONCLUSION
To know about Principle Parts of a Lathe.
To know about Engineering subject.
How to different Principle Parts of a Lathe.
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