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Spindle Speed
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Calculating the Correct Spindle RPM
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Note: Cutting speeds are expressed in sur-
face feet per minute (SFM) that the cutter
moves against the workpiece.
Recommended Cutting Speeds
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Rough Cuts Finish Cuts
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(*%
'*%
&%%
&%%
*%
&%%
,%
*%
*%
+%
.%
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-%%
,%%
*%%
'*%
'*%
&*%
'*%
&*%
&*%
&*%
&-%
'%%
&%%
Note: These values are based on HSS cutting
tools. For carbide cutting tools, double the aver-
age speed. These values are a guideline only.
Refer to the MACHINERY’S HANDBOOK for
more detailed information.
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Note: For this step, you will need to aver-
age out the diameters or work with the finish
diameter.
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Cutting Speed (SFM) x 4
Diameter of Cut
Spindle Speed
=
Example A
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&
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idda#
Step 1:
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Step 2:
+%%$#*9^VbZiZgd[ldg`e^ZXZ2&'%%
Result:
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Example B
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d[hiV^caZhhhiZZa!jh^c\VXVgW^YZXjii^c\
idda#
Step 1:
+%H;B[gdbX]Vgim'[dgXVgW^YZidda
2&'%
Step 2:
&'%9ZiZgb^cZYH;Bm)2)-%
Step 3:
)-% $ & 9^VbZiZg d[ ldg`e^ZXZ 2 )-%
GEB
Result:
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