Frequently Asked Questions
How is RPM calculated from SFM?
RPM equals surface speed in feet per minute times 3.82 divided by the cutter diameter in inches. The 3.82 constant comes from 12 divided by pi.
How do I find the feed rate?
Feed in inches per minute equals RPM times the number of flutes times the chip load per tooth. The tool suggests a chip load that scales with cutter size.
My calculated RPM is higher than my spindle. What now?
Small bits demand very high RPM. If your spindle cannot reach it, lower the surface speed or step up to a larger diameter cutter, then recalculate.
Are these numbers final?
They are starting points. Listen to the cut, watch chip color and size, and fine-tune feed and speed for your machine, tooling, and material.
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Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.