Cutting Speed Formulas
RPM = (SFM x 12) / (pi x D)
SFM = (pi x D x RPM) / 12
Feed Rate (IPM) = RPM x FPT x Flutes
Where D = diameter in inches, SFM = surface feet per minute, FPT = feed per tooth.
Cutting Speed Calculator
Calculate spindle RPM, surface speed, and feed rate for lathe and milling operations.
inches (IPR for lathe, IPT for mill)
for milling (1 for lathe)
Spindle Speed
--
RPM
Surface Speed
--
SFM (m/min)
Feed Rate
--
IPM (in/min)
MRR (approx)
--
in³/min
Recommended SFM
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for this material + tool
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