milling machines
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Milling MachinesBy
Avinash N. Fulbaria
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ContentIntroductionMilling ParametersTypes of Milling MachineMilling OperationsMilling CuttersComponents Of Milling MachineReference
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Milling Or Milling MachineMilling: a
process in which a rotating multi-tooth cutter removes material while traveling along various axes with respect to the work piece.
Cutter
Workpiece
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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
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Milling ParametersFeed : It is ratio of linear speed of
workpiece to the product of number of teeth and rpm of cutter.
F = V NnWhere , V = linear speed of
workpiece n = number of teeth
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Milling ParameterMilling Time : t = l + la V l = Length of workpiece la = approach length
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Milling ParameterMetal Removal Rate MRR = lwb tWhere w = width of the cut
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Types of Milling MachineConventional milling machineBed type milling machine Column- knee type milling
machine CNC milling machine (VMC)
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Column and Knee Type Milling m/c
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Bed Type Milling m/c
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CNC Milling m/c
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Milling OperationsPeripheral milling Face millingEnd milling
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Peripheral MillingIn peripheral
milling (also called plain milling), the axis of cutter rotation is parallel to the work piece surface.
Up milling Down milling
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Face Milling The cutter is
mounted on a spindle whose axis of rotation is perpendicular to workpiece surface.
Tool
Workpiece
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Milling CuttersStraddle: 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
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Slotter Cutter
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Components Of Milling MachineWorktable: 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.
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ReferenceS.K. Hajra Choudhary , A.K. Hajra
Choudhary , Nirjhar Roy , Elements of Workshop Technology , Vol 2 (12th Edition), Media Promoters & Publishers PVT. LTD
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