Lathe Speed Calculator — Safe RPM for Turning
Determine safe lathe RPM based on workpiece diameter and operation type.
Diameter of the circular area
Select the operation for your calculation
How We Calculate This
RPM = (Peripheral speed × 60,000) ÷ (π × Diameter in mm)
Target peripheral speeds: Roughing 5-10 m/s, Finishing 10-15 m/s, Sanding 3-5 m/s. Always start at the low end for unbalanced or irregular blanks.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.