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Model G0704 (Mfg. Since 0 8/11)
Calculating Spindle
Speed
Closely follow the proper spindle speed and
proper feed rate to produce good results, reduce
undue strain on all moving parts and increase
operator safety.
Prior to milling, determine the spindle speed
needed to cut your workpiece, then set the speed
on the machine.
To determine the needed spindle speed:
1. Use the table in Figure 24 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 spindle RPM for your operation:
(Cutting Speed x 4) /Tool Diameter = RPM
Cutting Speeds for High Speed Steel (HSS)
Cutting Tools
Workpiece Material Cutting Speed (sfm)
Aluminum & Alloys 300
Brass & Bronze 150
Copper 100
Cast Iron, soft 80
Cast Iron, hard 50
Mild Steel 90
Cast Steel 80
Alloy Steel, hard 40
Tool Steel 50
Stainless Steel 60
Titanium 50
Plastics 300-800
Wood 300-500
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 24. Cutting speed table for HSS cutting
tools.