(RPM = Revolutions Per Minute) 3.82 x SFM ÷ Diameter
(SFM = Surface Feet Per Minute ) 0.262 x Diameter ( Tool or Stock ) x RPM
Metric Conversion
(SFM to Surface Meters Per Minute) SFM x .3048
(Surface Meters Per Minute to SFM) SMPM x 3.2808399
Turning & Boring Cubic Inches per Minute
MMR =12 × DOC × Feed × SFM
Milling Feed Rate Formulas
Inches Per Minute (IPM) = FPT x T x RPM
Feed Per Revolution (FPR) = IPM ÷ RPM
Feed Per Tooth (FPT) = IPM ÷ (RPM x T)
Metric Conversion
Convert Inches Per Revolution (IPR) to Inches Per Minute (IPM) = IPR x RPM
Convert Inches Per Minute (IPM) to Inches Per Revolution (IPR) = IPM ÷ RPM
Convert Inches Per Revolution (IPR) to Millimeters Per Revolution (MMPR) = IPR x 25.40
Millimeters to Inches = Millimeters x .03937 = Inches
Inches to Millimeters = Inches x 25.4 = Millimeters
Meters to Inches = Meters x 39.37 = Inches
Inches to Meters = Inches x .0254 = Meters
Meters to Feet = Meters x 3.2808 = Feet
Feet to Meters = Feet x .3048 = Meters
Meters to Yards = Meters x 1.0936 = Yards
Milling Formulas
(CTM = Time Cutting Time in Minutes) L ÷IPM
(CTS = Time Cutting Time in Seconds) L ÷IPM x 60
(IPM = Inches per Minute) RPM x IPT x # of Teeth (flutes)
(MRR = Metal Removal Rate /Cubic Inches per Minute) W x D x IPM
These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Tooling Pro is assumed.