MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 2
c.
Selection of Milling Cutters.
The
following
factors
should
be
considered in the choice of milling cutters:
(1)
Type of Machine To Be Used. High-speed steel, stellite, and cemented
carbide cutters have the distinct advantage of being capable of rapid
production when used on a machine that can reach the proper speed.
Method of Folding The Workpiece. For example, 45 angular cuts may
(2)
either be made with a 45 single-angle milling cutter while the workpiece is
held in a swiveled vise, or with an end milling cutter while the workpiece
is set at the required angle in a universal vise.
(3)
Hardness of The Material To Be Cut.
The harder the material, the
greater will be the heat that is generated during the cutting process.
Cutters should be selected for their heat-resisting properties.
(4)
Amount of Material To Be Removed.
A course-toothed milling cutter
should be used for roughing cuts, whereas a finer toothed milling cutter may
be used for light cuts and finishing operations.
(5)
Number of Pieces To Be Cut.
For example, when milling stock to
length, the choice of using a pair of side milling cutters to straddle the
workpiece, a single-side milling cutter, or an end milling cutter will
depend upon the number of pieces to be cut.
(6)
Class of Work Being Done. Some operations can be accomplished with
more than one type of cutter, such as in milling the square end on a shaft
or reamer shank. In this case, one or two side milling cutters or an end
milling cutter may be used.
However, for the majority of operations,
cutters are specially designed and named for the operation they are to
perform.
(7)
Rigidity and Size of The Workpiece. The milling cutter used should
be small enough in diameter so that the pressure of the cut will not cause
the workpiece to be sprung or displaced while being milled.
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