General Milling Formulas for Working with Carbide Tools, Engravers, End-Mills and Cutters
To Find | Using | Formula |
SFM | RPM – Revolutions per Minute | RPM ÷ 3.82 x Dia = SFM |
RPM | SFM – Surface Feet per Minute | SFM x 3.82 ÷Dia = RPM |
IPM | RPM – Revolutions per Minute | RPM x IPT x #FL = IPM |
IPT | IPM – Inches per Minute RPM – Revolutions per Minute # FL – # of Flutes | IPM ÷RPM ÷#FL = IPT |
IPR/FR | IPM – Inches per Minute RPM – Revolutions per Minute | IPM ÷RPM = IPR (FR) |
MR | ADC – Axil Depth of Cut | ADC x RDC x IPM = MR |
HP | IPM – Inches per Minute | IPM x RDC x ADC x PC = HP |