Technical Library
Calculators
1) Click Reset 
2) Enter all but one value 
3) Click Compute
Calculate Surface Feet Per Minute 
SFM = (Pi * Dia * RPM) / 12 
SFM = Surface Feet Per Minute 
Dia = Diameter (inches) 
RPM = Revs Per Minute 
Dia  RPM  SFM 
Inches  Millimeters
Convert From Fraction to Decimal 
(Does not go from decimal to fraction)
Fraction  Decimal 
Calculator Java scripts courtesy of
The Machinists' Exchange On-line.
© The Machinists' Exchange On-line. 
Used with permission.



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