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Calculating Spindle
RPM
Closely follow the proper cutting speed and prop-
er feed to reduce undue strain on all moving parts
and increase operator safety.
Prior to milling, determine the RPM needed to
cut your workpiece, then set the RPM on the
machine.
To determine the needed RPM:
1.
Use the table in Figure 19 to determine the
cutting speed required for the material of your
workpiece.
2.
Measure the diameter of your cutting tool in
inches.
3.
Use the following formula to determine the
needed RPM for your operation:
(Cutting Speed x 4) /Tool Diameter = RPM
G0619 DELUXE SMALL MILL/DRILL
Cutting Speeds for High Speed Steel (HSS)
Cutting Tools
Workpiece Material
Aluminum & alloys
Brass & Bronze
Copper
Cast Iron, soft
Cast Iron, hard
Mild Steel
Cast Steel
Alloy Steel, hard
Tool Steel
Stainless Steel
Titanium
Plastics
Wood
Note: For carbide cutting tools, double the cut-
ting speed. These values are a guideline only.
Refer to the MACHINERY'S HANDBOOK for
more detailed information.
Figure 19. Cutting speed table for HSS cutting
tools.
Cutting Speed (sfm)
300
150
100
80
50
90
80
40
50
60
50
300-800
300-500
-21-
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