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Common Machining Terms and Formulas


Surface Feet Per Minute (SFPM)
SFPM = (Pi x Diameter x RPM) / 12

Cutter Chip Load (CL)
CL = Feed Rate (Inches per minute) / RPM / Number of Teeth

Inch/Millimeter Conversion
Inches: (1" = 25.4mm) --  Millimeters: (1mm = 0.03936")


IPM = Inches Per Minute
IPR = Inches Per Revolution
RPM = Revolutions Per Minute
SFM = Surface Feet per Minute
D = Drill Diameter


IPM = IPR x RPM
IPR = IPM / RPM
RPM = SFM x 3.82 / D
SFM = D x RPM x 0.26