This document provides information about various lathe machine accessories and operations. It describes common work holding devices like three jaw chucks for holding cylindrical stock and four jaw chucks which have independently adjustable jaws. It also mentions collet chucks for small workpieces and magnetic chucks for thin jobs. Other accessories discussed include lathe centers, lathe dogs, mandrels, rests, and face plates. Finally, it outlines various lathe operations like facing, turning, threading, drilling, tapering, knurling and grooving.

1. LATHE MACHINE
ACCESSORIES
HVTI

2. Work Holding Devices
THREE JAWS CHUCK
- For holding cylindrical stock centered.
- For facing/center drilling the end of your
aluminum stock
FOUR JAWS CHUCK
- This is independent chuck generally has four
jaws , which are adjusted individually on the
chuck face by means of adjusting screws

3. Chuck
HVTI
Three Jaw
Four Jaw

4. • Thin jobs can be held by means of
magnetic chucks.
Collet Chuck
Magnetic Chuck
Collet chuck is used to
hold small workpieces
Thin jobs can be held by
means of magnetic chucks.

5. Lathe Centers
 Work to be turned between centers must
have center hole drilled in each end
 Provides bearing surface
 Support during cutting
 Most common have
solid Morse taper shank
60º centers, steel with carbide tips
 Care to adjust and lubricate occasionally

6. Lathe Center
HVTI
Ordinary Carbide
Tipped
Half
CENTER
Pipe Center

7. LATHE DOGS
• LATHE DOGS ARE CAST METAL DEVICES USED TO PROVIE A FIRM
CONNECTION BETWEEN THE HEADSTOCK SPINDLE AND THE W/P
MOUNTED BETWEEN CENTRES.
Tail
Tail

8. MANDRELS
• MANDRELS IS USED TO HELD THE HOLLOW/DRILLED W/P.
•
Workpiece Mandrel

9. HVTI
Plain - A
Expansion - B
Collar - C
Stepped

10. RESTS
• LONG W/P NEED EXTRA SUPPORT THAT TEND TO SPRING
AWAY FROM THE TOOL BIT. WE USE THE REST FOR
PROVIDE SUPPORT.
Jaws
Hinge
Work Work Jaws
Lathe bed guideways
Carriage

11. FACE PLATES
• A LATHE FACE PLATE IS A FLAT ROUND PLATE THAT THREADS TO THE
HEADSTOCK SPINDLE TO THE LATHE.
• THE FACEPLATE IS USED FOR IRREGULARLY SHAPED W/P THAT
CANNOT SUCCESFULLY HELD BY CHUCKS.
Workpiece

12. Lathe Operations
HVTI

13. Name of Operations
• Facing
• Plain Turning
• Step Turning
• Eccentric Turning
• Taper Turning
• Boring
• Reaming
• Tapping
• Parting Off
• Knurling
• Grooving
• Thread Cutting

14. Turning
A single point cutting tool removes material from a rotating
workpiece to generate a cylindrical shape
• Performed on a machine tool called a lathe
• Variations of turning that are performed on a lathe:
• Facing
• Contour turning
• Chamfering
• Cutoff
• Threading

15. Turning ..
Cylindrical job
Cutting
speed
Chip
Workpiece
Depth of cut (d)
Depth of cut
Tool
FeedChuck
N
Machined
surface

16. Fig. Turning operation

17. Facing
Flat Surface/Reduce length
Depth of
cut
Feed
WorkpieceChuck
Cutting
speed
Tool
d
Machined
Face

18. Facing operation

19. Eccentric Turning
Axis of job
Axis of
Eccentric peg
(to be turned)
4-jaw
chuck
Cutting
speed

20. Knurling
Knurling tool
Tool post
Feed
Cutting
speed
Movement
for depth
Knurled surface

21. Grooving ..
Shape produced
by form tool Groove
Grooving
tool
Feed or
depth of cutForm tool

22. Parting ..
FeedParting tool

23. Chamfering
Chamfering tool
Feed
Chamfer

24. Chamfering
Cutting edge cuts an angle on the corner of the cylinder,
forming a "chamfer"
Fig. (e) chamfering

25. Taper Turning
• Taper:
 C
B
A L
D
90°
 2D1
L
DD
2
tan 21 


26. Drilling
Drill – cutting tool – held in TS – feed from TS
Feed
Drill
Quill
clamp moving
quill
Tail stock clamp
Tail stock

27. Contour Turning
Instead of feeding the tool
parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
Figure ..contour turning

28. Contour Turning
Instead of feeding the tool parallel to the axis of rotation, tool
follows a contour that is other than straight, thus creating a
contoured form
Fig. (c) contour turning

29. Threading
Pointed form tool is fed
linearly across surface
of rotating workpart
parallel to axis of
rotation at a large feed
rate, thus creating
threads
Figure; threading

31. The End