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 
Convert Between Inches & Millimeters 
.03936" = 1mm     25.4mm = 1"
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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