Speeds/Feeds (Standard)


SFM = Surface Feet per Minute
RPM ÷ 3.82 x Diameter of tool

RPM = Revolutions Per Minute
SFPM x 3.82 ÷ Diameter of tool

IPT = Inches Per Tooth, Chipload
IPM ÷ RPM ÷ #FL
#FL = # of Flutes

IPM = Inches Per Minute
RPM x IPT x #FL
#FL = # of Flutes

IPR/FR = Inches/Feed Per Revolution
IPM ÷ RPM

MR = Cubic Inches Per Minute, Metal Removal
ADC x RDC x IPM
ADC = Axial Depth of Cut
RDC = Radial Depth of Cut

HP = Horsepower Required
IPM x RDC x ADC x PC
RDC = Radial Depth of Cut
ADC = Axial Depth of Cut
PC = Power Constraints


Conversions:
○ SFM to m/min: SFM x .3048
○ IPM to mm/min: IPM x 25.4
○ m/min to SFM: m/min ÷ .3048
○ mm/min to IPM: mm/min ÷ 25.4
○ HP (Standard) to HP (Metric): HP (Standard) x 16.3871

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