Milling Machines

1. Milling Machines
By
Avinash N. Fulbaria

2. Content
 Introduction
 Milling Parameters
 Types of Milling Machine
 Milling Operations
 Milling Cutters
 Components Of Milling Machine
 Reference

3. Milling Or Milling Machine
 Milling: a process
in which a rotating
multi-tooth cutter
removes material
while traveling
along various axes
with respect to the
work piece.
Cutter
Workpiece

4. Milling Parameters
 Cutting speed : it is the peripheral
speed of the milling cutter relative to
the work.
V= πdN m per minute
1000
where V= cutting speed
d = Diameter of cutter in mm
N = RPM of cutter

5. Milling Parameters
Feed : It is ratio of linear speed of
workpiece to the product of number of
teeth and rpm of cutter.
F = V
Nn
Where , V = linear speed of
workpiece
n = number of teeth

6. Milling Parameter
 Milling Time :
t = l + la
V
l = Length of workpiece
la = approach length

7. Milling Parameter
 Metal Removal Rate
MRR = lwb
t
Where w = width of the cut

8. Types of Milling Machine
 Conventional milling machine
 Bed type milling machine
 Column- knee type milling machine
 CNC milling machine (VMC)

9. Column and Knee Type Milling
m/c

10. Bed Type Milling m/c

11. CNC Milling m/c

12. Milling Operations
 Peripheral milling
 Face milling
 End milling

14. Peripheral Milling
 In peripheral
milling (also
called plain
milling), the
axis of cutter
rotation is
parallel to the
work piece
surface. Up milling Down
milling

15. Face Milling
 The cutter is
mounted on a
spindle whose axis
of rotation is
perpendicular to
workpiece surface.
Tool
Workpiece

16. Milling Cutters
 Straddle: More cutters are used to machine two
parallel surfaces on the workpiece.
 Form milling : It produces curved profiles using
cutters that have specially shaped teeth.
 Slotting and slitting operations are performed
with circular cutters. Eg.T-slot cutters

18. Slotter Cutter

19. Components Of Milling
Machine
 Worktable: on which the work piece is clamped
using T-slots. The table moves longitudinally
relative to the saddle.
 Saddle: supports the table and can move in the
transverse direction.
 Knee: supports the saddle and gives the table
vertical movement so that the depth of cut can be
adjusted and work pieces with various heights
can be accommodated.
 Overarm: used on horizontal machines; it is
adjustable to accommodate different arbor
lengths.
 Head: contains the spindle and cutter holders.

20. Reference
 S.K. Hajra Choudhary , A.K. Hajra
Choudhary , Nirjhar Roy , Elements of
Workshop Technology , Vol 2 (12th
Edition), Media Promoters &
Publishers PVT. LTD

21. END