MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
the speed should be about one-half the speed recommended in the table.
If
carbide-tipped cutters are used, the speed can be doubled.
(c)
If a plentiful supply of cutting oil is applied to the milling
cutter and the workpiece, the speeds can be increased from 50 to 100
percent.
TABLE 1.
MILLING MACHINE CUTTING SPEEDS
FOR HIGH-SPEED STEEL MILLING CUTTERS.
(d)
For roughing cuts, a moderate speed and coarse feed give best
results; for finishing cuts, the best practice is to reverse these
conditions, using a higher speed and a lighter cut.
(3)
Speed Computation.
(a)
The formula for calculating spindle speed in revolutions per minute
is as follows:
Where, rpm = spindle speed (in revolution per minute)
30
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