1. Machine tools and their applications
Unit – I
Machine tools and their applications

2. Syllabus Drilling machine:
Types of drills and operations. Twist drill geometry, Types of drilling machine, Tool holder, Calculation of machining time for Drilling Process
Milling machine:
Types of milling machines, Cutter-types and geometry and their applications. Universal dividing head, Methods of Indexing: Simple, Compound, Differential.
Numericals based on indexing.
Calculation of machining time for Milling processes(Numericals)
Broaching:
Introduction to broaching, Broach tool geometry, Types of broaching machines and operations.
Planer and Boring Machines(Introduction and types)

3. Unit
In Sem Exam
Remark
End Sem Exam 1 10
TH+NU 7 2 3 8 4 16 5 6

4. University Questions Explain with sketch types of broaches
Explain tool geometry features of broach and values for HSS broach for finishing hole
List types of broaching machines and sketch any continuous broaching machine
Draw sketch of planing machine and label

5. University Questions
List types of planer machine and their features with application
Explain boring operation and need for a boring machine
Draw sketch of horizontal boring machine and label
List types of boring machines and their applications

6. Broaching Machines

7. Broaching
Moves a multiple tooth cutting tool linearly relative to work in direction of tool axis
Fig. The broaching operation
When the broach is fed in a straight line ,
metal is cut in several successive layers

8. Broaching Advantages: Good surface finish Close tolerances
Variety of work shapes possible
Cutting tool called a broach
Owing to complicated and often custom‑shaped geometry, tooling is expensive

9. Broach Geometry
Figure (a) Cutting action of a broach showing various features.
(b) Terminology for a broach.

10. Geometry of broaching teeth and their cutting edges
Small in-built chip breakers are alternately provided on the roughing teeth to break up the wide curling chips

11. Chipbreaker Features on Broaches
Figure Chip breaker features on (a) a flat broach and (b) a round broach.

12. Pull-Types Internal Broach
Figure Terminology for a pull-type internal broach used for enlarging long holes

13. Sawing Operations
Figure Examples of various sawing operations.

14. Saw Teeth Figure (a) Terminology for saw teeth.
(b) Types of tooth sets on saw teeth staggered to provide clearance for the saw blade to prevent binding during sawing.
Figure
High-speed-steel teeth welded on a steel blade
Carbide inserts brazed to blade teeth.

15. Mounting blank in broaching machine

16. Different Types Of Broaches And Their Applications
Internal broaching or External broaching
Pull type or Push type
Ordinary cut or Progressive type
Solid, Sectional or Modular type
Profile sharpened or form relieved type

17. Internal and external broaching (tool)
Internal broaching tools are used to enlarge and finish various contours in through holes preformed by casting, forging, rolling, drilling, punching etc.
internal broaching tools are mostly pull type but may be push type also for lighter work.

18. Internal broaching (tool)

19. Internal broaching (tool)

20. External broaching broaching (tool)
Applications of external broaching are :
un-obstructed outside surfacing; flat, peripheral and contour surfaces
grooves, slots, keyways etc. on through outer surfaces of objects
external splines of different forms
teeth of external spur gears or gear sectors

21. External broaching broaching (tool)

22. External broaching broaching (tool)

23. Ordinary – cut and Progressive type broach
Ordinary – cut type where the teeth increase in height or protrusion gradually from tooth to tooth along the length of the broach
Progressive – cut type broaches have their teeth increasing in width instead of height

24. Ordinary – cut and Progressive type broach

25. Solid, Sectional and module type broaches

26. Broaching Machines
Broaching needs only one motion and that is the cutting motion (velocity) preferably being imparted to the broach
Design, construction and operation of broaching machines, requiring only one such linear motion, are very simple

27. Broaching Machines
Broaching machines are generally specified by
Type : horizontal, vertical etc.
Maximum stroke length
Maximum working force (pull or push)
Maximum cutting velocity possible
Power

28. Broaching Machines Classification
According to purpose of use
general purpose
single purpose
special purpose
According to nature of work
internal broaching
external (surface) broaching

29. Broaching Machines Classification
According to configuration
horizontal
vertical
According to number of slides or stations
single station type
multiple station type
indexing type
According to tool / work motion
intermittent (one job at a time) type
continuous type

30. Broaching Machines

31. Broaching Machines occupies less floor space
are more rigid as the ram is supported by base
mostly used for external or surface broaching though internal

32. High production broaching machines
incorporating automation in tool – job mounting and releasing
increasing number of workstations or slides for simultaneous multiple production
quick changing the broach by turret indexing
continuity of working

33. Planer and Boring Machines

34. Planing Machine

35. Planing machine
simple kinematic system of the planing machine enables transmission and transformation of rotation of the main motor into reciprocating motion of the large work table and the slow transverse feed motions (horizontal and vertical) of the tools

36. Planing machine The reciprocation of the table, which imparts cutting
motion to the job, is attained by rack-pinion mechanism.

37. Planing machine
The rack is fitted with the table at its bottom surface and the pinion is fitted on the output shaft of the speed gear box which not only enables change in the number of stroke per minute but also quick return of the table

38. Planing machine
The blocks holding the cutting tools are moved horizontally along the rail by screw-nut system and the rails again moved up and down by another screw-nut pair

39. Planing machine operations

40. Planing machine operations

41. Planing machine operations
All the operations done in shaping machine can be done in planing machine. But large size and stroke length and higher rigidity enable the planing machines do more heavy duty work on large jobs and their long surfaces.

42. Planing machine operations
Simultaneous use of number of tools further enhances the production capacity of planing machines

44. Planing Machines

45. Planing Machines

46. Planing Machines

47. Planing Machines

48. Planing Machines

49. Planing Machines

54. Boring Machines

55. Boring Machines

66. Fllor type BM

67. Cylinder Boring Machine