Welcome to PCT Cutters Endmills and Drill Solutions
Speeds and Feeds Calculator
(inch formulas)
SFM - Surface Feet per Minute

Surface Feet per Minute
Formula Being Used: RPM / 3.82 x Dia
Enter RPM:
(Revolutions per Minute)		  
Enter Dia:
(Tool Diameter)		  
 
   
RPM - Revolutions per Minute

Revolutions per Minute
Formula Being Used: SFM x 3.82 / Dia
Enter SFM:
(Surface Feet per Minute)
Enter Dia:
(Tool Diameter)
 
IPM - Inches Per Minute

Inches per Minute
Formula Being Used: RPM / IPT x #FL
Enter RPM:
(revolutions per minute)
Enter IPT:
(inches per tooth per rev)
Enter # of Flutes:
 
IPT - Inches Per Tooth

Inches per Tooth
Formula Being Used: IPM / RPM / #FL
Enter IPM:
(inches per minute)
Enter RPM:
(revolutions per minute)
Enter # of Flutes:
 
IPR - Inches Per Revolution

Inches per Revolution (feed rate)
Formula Being Used: IPM / RPM
Enter IPM:
(inches per minute)
Enter RPM:
(revolutions per minute)
 
MR - Metal Removal

Metal Removal Cubic Inches per Minute
Formula Being Used: ADC x RDC x IPM
Enter ADC:
(axial depth of cut)
Enter RDC:
(radial depth of cut)
Enter IPM:
(inches per minute)
 
HP - Horsepower
Machine Horsepower Required
Formula Being Used: IPM x RDC x ADC x PC
Enter IPM:
(inches per minute)
Enter RDC:
(radial depth of cut)
Enter ADC:
(axial depth of cut)
Enter PC:
(power constants)
 
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