Cutting Tool Formulas

To Find	Using	Formula
SFM = Surface Feet Per Minute	RPM = Revolutions per Minute Dia = Tool Diameter	RPM / 3.82 x Dia = SFM
RPM = Revolutions per Minute	SPM = Surface Feet per Minute Dia = Tool Diameter	SFM x 3.82 / Dia = RPM
IPM = Inches per Minute	RPM = Revolutions per Minute IPT = Inches per Tooth per Rev #FL - # of Cutting Flutes	RPM / IPT x #FL = IPM
IPT = Inches per Tooth	IPM = Inches per Minute RPM = Revolutions per Minute #FL - # of Cutting Flutes	IPM / RPM / #FL = IPT
IPR = Inches per Revolution (feed rate)	IPM = Inches per Minute RPM = Revolutions per Minute	IPM / RPM = IPR (FR)
MR = Metal Removal Cubic Inches per Minute	ADC = Axial Depth of Cut RDC = Radial Depth of Cut IPM = Inches per Minute	ADC x RDC x IPM = MR
HP = Horsepower Machine Horsepower Required	IPM = Inches per Minute RDC = Radial Depth of Cut ADC = Axial Depth of Cut PC = Power Constants	IPM x RDC x ADC x PC = HP

PC = Power Constraints for HP
HP / CL - MR