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Milling Machines
By
Avinash N. Fulbaria
Content
 Introduction
 Milling Parameters
 Types of Milling Machine
 Milling Operations
 Milling Cutters
 Components Of Milling Machine
 Reference
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
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
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
Milling Parameter
 Milling Time :
t = l + la
V
l = Length of workpiece
la = approach length
Milling Parameter
 Metal Removal Rate
MRR = lwb
t
Where w = width of the cut
Types of Milling Machine
 Conventional milling machine
 Bed type milling machine
 Column- knee type milling machine
 CNC milling machine (VMC)
Column and Knee Type Milling
m/c
Bed Type Milling m/c
CNC Milling m/c
Milling Operations
 Peripheral milling
 Face milling
 End milling
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
Face Milling
 The cutter is
mounted on a
spindle whose axis
of rotation is
perpendicular to
workpiece surface.
Tool
Workpiece
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
Slotter Cutter
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.
Reference
 S.K. Hajra Choudhary , A.K. Hajra
Choudhary , Nirjhar Roy , Elements of
Workshop Technology , Vol 2 (12th
Edition), Media Promoters &
Publishers PVT. LTD
END

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Milling machines

  • 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
  • 12. Milling Operations  Peripheral milling  Face milling  End milling
  • 13.
  • 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
  • 17.
  • 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