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Home > Ordnance Documents and other related manuals > > Feeds For Milling
Speed Computation.
Table 2: Milling Cutter Rotational Speeds

Milling Machine Operations
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MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
cs
=
cutting speed of milling cutter
(in surface feet per minute)
D
=
diameter of milling cutter (in inches).
For example, the spindle speed for machining a piece of steel at a speed of
35 rpm with a cutter 2 inches in diameter is calculated as follows:
Therefore, the milling machine spindle would be set for as near 70 rpm as
possible.
If  the  calculated  rpm  cannot  be  obtained,  the  next  lower
selection should be made.
(b)
Table  2  on  page  32  is  provide  to  facilitate  spindle  speed
computations for standard cutting speeds and standard milling cutters.
d.
Feeds For Milling.
(1)
General.
The rate of feed, or the speed at which the workpiece
passes the cutter, determines the time required for cutting a job.
In
selecting the feed, there are several factors which should be considered.
These factors are:
(a)
Forces are exerted against the workpiece, the cutter, and their
holding  devices  during  the  cutting  process.
The  force  exerted  varies
directly with the amount of metal removed and can be regulated by the feed
and the depth of cut.
Therefore, the correct amount of feed and depth of cut are interrelated, and
in turn are dependent upon the rigidity and power of the machine.  Milling
machines are limited by the power that they can develop to turn the cutter
and the amount of vibration they can resist when using coarse feeds and deep
cuts.
(b)
The feed and depth of cut also depend upon the type of milling
cutter being used.
For example, deep cuts or coarse feeds should not be
attempted when using a small diameter end milling cutter, as such an attempt
would spring or break the
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