Spindle Speed
Calculating the Correct Spindle RPM
1. Figure 48
Recommended Cutting Speeds
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Rough Cuts Finish Cuts
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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.
Figure 48.
2.
Note: For this step, you will need to aver-
age out the diameters or work with the finish
diameter for your calculations.
3.
Cutting Speed (SFM) x 4
Diameter of Cut
Spindle Speed
=
Configuring the V-Belts and Back
Gear
To configure the V-belts:
1.
2. Figure 49
Note: This chart is also on the front of the
headstock. The "Direct" speeds are with
the back gear disengaged. Instructions for
engaging the back gear are on Page 35.
6
&
' (
/min.
A
B
& ' (
DIRECT
BACK GEAR
1200 900 655
550 410 300
220 165 120
100 75 50
7
B
Figure 49.
