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CETS Resources
For all your carbide insert grades, speeds, and feeds needs.
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