INTRODUCTION TO LATHE MACHINE

1. INTRODUCTION TO LATHE MACHINE
Presented By.
Mohammed Tayeeb

2. Contents
• Introduction
• Components Of Lathe
• Types Of Lathe
• Engine Lathe

3. PRINCIPLE OF LATHE
 Lathe is a machine, which is used to remove
metal from the workpiece to required shape
and size.

4. COMPONENTS OF LATHE

5. TYPES OF LATHES
•Speed Lathe :
It is the simplest type lathe. It is mainly used for metal
spinning, polishing etc.
•Bench Lathe :
It is small sized engine lathe mounted on bench. It is used
for turning small and light weight workpiece.
•Tool Room Lathe :
It is used for production of small tools, gauges, fixtures and
accurate parts in tool room.

6. •Turret Lathe :
These lathes are used in mass production and for
heavy duty workpieces.
•Capsten Lathe :
These lathes are used in mass production used for
light duty workpieces.
•Special Purpose Lathe :
These lathes are modification of engine lathes
developed for machining special types of workpices.

7. ENGINE LATHE

8. PARTS OF LATHE
•Bed : Supports all major components
•Carriage: Slides along the ways and consists of the cross-slide,
tool post, apron
•Headstock : Holds the jaws for the work piece, supplies power to
the jaws and has various drive speeds
•Tailstock : Supports the other end of the workpiece
•Feed Rod and Lead Screw : Feed rod is powered by a set of
gears from the headstock

9. CARRIAGE
 Used to move cutting
tool along lathe bed
 Consists of three
main parts
 Saddle
 Cross-slide
 Apron

10. APRON

11. 11
TAILSTOCK

12.  Chucks :
• Three Jaw Chuck (Self Centering Chuck) :
This chuck is used to hold circular
workpiece and is available in sizes from
100mm to 600 mm.
 Four Jaw Chuck (Independent Chuck) :
It is used to hold rectangular,
sqare and irregular shaped workpieces .
ACCESSORIES

13. •Turing
•Facing
•Boring
•Drilling
•Taper
•Camfering
•Grooving
•Forming
•Reaming
•Undercutting
•Thread cutting
•Knurling
LATHE OPERATIONS

14. LATHE OPERATIONS

15. TURNING
 Forces in turning
 Cutting force: acts downward on the tool tip
 Thrust force: acts in the longitudinal direction
 Radial force: acts in the radial direction
 Roughing and Finishing Cuts
 Rough cut: high speed cut with little regard for dimensional
tolerance
 Finishing cut: lower feed rate and depth of cut
 Tool Materials, Feeds, and Cutting Speeds
 Cutting Fluids

16. CONCEPT OF SPEED, FEED AND DEPTH OF CUT
•Cutting speed=Πdn mm/min
1000
•Feed :
•It is expressed in mm/rev
•Depth of cut :
t=D-d mm
2

17. SINGLE POINT CUTTING TOOL GEOMETRY
•Clearance
•Rake
•End cutting
edge angle
•Side cutting
edge angle

18. Thank You…
Any Questions ?