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Spindle Speed Calculator

Construction & Home Improvement

Calculate lathe or mill spindle RPM and feed rate from surface speed, tool diameter, and feed per revolution.

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SFM
1 SFM2,000 SFM
0.01 in12 in
0 in1 in

Spindle Speed

764

Recommended spindle speed in revolutions per minute.

Feed Rate

3.82

Resulting feed rate in inches per minute.

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Odeh Ahwal

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Odeh Ahwal
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Frequently Asked Questions

How is spindle RPM calculated from surface speed?

RPM equals surface speed in feet per minute, times 3.8197, divided by the tool or workpiece diameter in inches. This constant comes from converting surface speed, feet times pi times diameter times RPM, into a direct RPM formula.

What surface speed should I use?

Recommended surface speed, in surface feet per minute, depends heavily on the material being cut and the tool material and coating. Check a speeds and feeds chart for your specific material and tool combination rather than guessing.

Does this apply to both lathe turning and milling?

Yes, the same surface-speed-to-RPM relationship applies to both operations. For milling, diameter refers to the cutting tool; for turning, it refers to the workpiece diameter at the cut.

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