information of machining process

1. Shri. Shamrao Patil (Yadravkar) Educational & Charitable Trust’s
Sharad Institute of Technology, College of Engineering Yadrav- (Ichalkaranji)
(Approved by AICTE, New Delhi, Recognized by Government of Maharashtra & Affiliated to DBATU, Lonere)
Accredited by NAAC ‘A’ Grade and NBA, ISO 9001:2015 Certified Institute
Recognized u/s 2(f) and 12(B) of the UGC Act 1956
An Autonomous Institute
Machining Processes
Mr. S M Ghanvat
ME (CAD/CAM/CAE)
Assistant Professor
Mechanical Department

2. Introduction
Miscellaneous cutting operations that can be performed on a lathe

4. General view of a typical lathe, showing various components

5. The Turning Process
Geometry of a typical right-hand cutting tool
Designations for a right-hand cutting tool.

8. Lathes and Lathe Operations
Lathe Components

9. Workholding Devices and Accessories
(a) and (b) Schematic illustrations of a draw-in type of collet. The workpiece is placed in the
collet hole, and the conical surfaces of the collet are forced inward by pulling it with a draw bar
into the sleeve. (c) A push-out type of collet. (d) Work holding of a workpiece on a face plate.

10. Various types of mandrels to hold workpieces for turning. These mandrels usually are
mounted between centers on a lathe. Note that in (a) both the cylindrical and the end faces
of the workpiece can be machined, whereas in (b) and (c) only the cylindrical surfaces can
be machined.

11. Lathe Operations
Miscellaneous cutting operations that can be performed on a lathe

12. Types of Lathes
Schematic illustration of the components of a turret lathe.

13. (a) A computer-numerical-control lathe. Note the two turrets. These machines have higher
power and spindle speed than other lathes in order to take advantage of new cutting tools
with enhanced properties. (b) A typical turret equipped with 10 tools, some of which are
powered.

14. Turning-process Capabilities
Range of dimensional tolerances obtained in
various machining processes as a function of
workpiece size.

15. The range of surface roughnesses obtained in various processes.

16. Design Considerations and Guidelines for Turning Operations

17. Chip Collection Systems
Chips can be collected by any of the following methods:
° Allowing gravity to drop them onto a steel conveyor belt.
° Dragging the chips from a settling tank.
° Using augers with feed screws (similar to those in meat grinders).
° Using magnetic conveyors (for ferrous chips).
° Employing vacuum methods of chip removal.

18. Cutting Screw Threads
a) Cutting screw threads on a lathe with a single-point cutting tool. (b) Cutting screw
threads with a single-point tool in several passes, normally utilized for large threads. (c) A
typical coated-carbide insert in the process of cutting screw threads on a round shaft. (d)
Cutting internal screw threads with a carbide insert.

19. Boring and Boring Machines
Schematic illustration of a vertical boring mill.
(a) Schematic illustration of a steel boring bar with a carbide insert. (b) Schematic
illustration of a boring bar with tungsten-alloy “inertia disks”

20. Drilling, Drills, and Drilling Machines
Drills
Two common types of drills: (a) Chisel-edge drill. (b) Crankshaft drill.

21. Various types of drills and drilling and reaming operations.

22. Material-removal Rate in Drilling
Drilling Practice

23. (a) Schematic illustration of the components of a vertical drill press. (b) A radial drilling
machine.
Drilling Machines

24. A three-axis computer numerical-control drilling machine.

25. Design Considerations for Drilling

26. Reaming and Reamers
(a) Terminology for a helical reamer. (b) Inserted-blade adjustable reamer.

27. Tapping and Taps
(a) Terminology for a tap. (b) Tapping of steel nuts in production.