This document provides an overview of various machining operations presented in a classroom lecture, including: 1. Drilling, boring, reaming, counterboring, countersinking, spot facing, and tapping operations for producing holes in workpieces. 2. Milling operations such as plain milling, face milling, angular milling, form milling, straddle milling, gang milling, slot and groove milling, keyway milling, slitting, end milling, profile milling, gear milling, and thread milling. Definitions and purposes are given for each operation. 3. The document appears to be from a Mechanical Engineering class focusing on machining

1. APPA
INSTITUTE OF ENGINEERING & TECHNOLOGY, KALABURAGI
DEPARTMENT OF MECHANICAL ENGINEERING
DATE: 13TH MARCH 2017
TIME: 1:30-3:30
CLASS: 4TH SEM “B” 1
By:
Asst.Prof. PRASHANT MULGE
B.E., M.Tech.,(Ph.D.)

2. DRILLING OPERATIONS
1. DRILLING
2. BORING
3. REAMING
4. COUNTER BORING
5. COUNTER SINKING
6. SPOT FACING
7. TAPPING
8. TREPANNING
2

3. DRILLING OPERATION
Drilling is done to produce a cylindrical hole in the workpiece. 3

4. BORING OPERATION
Boring is done to enlarge a previously drilled hole in the workpiece. 4

5. REAMING OPERATION
Reaming is done to improve the surface finish of hole in the workpiece.5

6. COUNTER BORING
Counter boring is done to accommodate the head of bolts, studs, sockets etc. in the
workpiece.
6

7. COUNTER SINKING
Counter sinking is done to produce a conical shape for a short distance
in previously drilled hole in the workpiece. 7

8. SPOT FACING
Spot facing is done to produce a flat surface at the opening of a drilled hole to provide
a seat for the underside of a bolt head, washer or nut in the workpiece. 8

9. TAPPING OPERATION
Tapping is done to produce a internal threads in a previously dilled hole in the
workpiece.
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10. TREPANNING OPERATION
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Trepanning is the operation of producing large diameter hole on sheet metal.

11. MILLING OPERATIONS
1. PLAIN OR SLAB MILLING
2. FACE MILLING
3. ANGULAR MILLING
4. FORM MILLING
5. STRADDLE MILLING
6. GANG MILLING
7. SLOT & GROOVE MILLING
8. KEYWAY MILLING
9. SLITTING OR SAW MILLING
10. SIDE MILLING
11. END MILLING
12. PROFILE MILLING
13. GEAR MILLING
14. THREAD MILLING
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12. PLAIN OR SLAB MILLING
Plain milling is also called
as a surface or slab milling , is the
operation of producing a plain
horizontal surface with a milling
cutter whose axis is parallel to the
surface of the workpiece.
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13. FACE MILLING
Face milling is the operation of producing a flat surface which is perpendicular
to the axis of the rotating cutter.
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14. ANGULAR MILLING
Angular milling is the operation of producing all types of angular cuts like V-notches
and grooves on workpiece.
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15. FORM MILLING
Form milling is the operation of producing curved profiles with a variety of
shapes like concave, convex, splines etc. on a workpiece. 15

16. STRADDLE MILLING
Straddle milling is the
operation in which a pair of side
milling cutters are used for
machining two parallel vertical
surfaces simultaneously.
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17. GANG MILLING
Gang milling is the operation in which two or more cutters are mounted on the sane
arbor , so that different profiles required on the workpiece can be machined simultaneously in a
single pass.
17

18. SLOT & GROOVE MILLING
Slot milling is the operation
of producing slots like T-slots,
dovetail slots etc., in worktable
fixtures and other work holding
devices.
18

19. KEYWAY MILLING
Keyway milling is
the operation in which a
groove of different shapes
are cut along the axis of
cylindrical surfaces of the
shafts into which keys are
fitted.
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20. SLITTING OR SAW MILLING
Saw milling is the operation used for parting-off a solid workpiece into two parts or
cutting narrow slots and grooves.
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21. END MILLINGEND MILLING
End milling is the operation performed for producing flat surfaces, slots, grooves or
finishing the edges of the workpiece by means of a tool called end mill.
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22. PROFILE MILLING
In profile milling , the profile of a
template or cavity shape of a master die is
duplicated on the workpiece surface.
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23. GEAR MILLING
Gear milling is the
operation performed on a
milling machine for
cutting teeth of different
shapes by using formed
milling cuttes.
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24. THREAD MILLING
Thread milling is a method of cutting screw threads with the help of form milling
cutters. Both internal and external threads can be milled. Thread milling is associated with
single and multiple cutters. 24

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