• Milling Formulas

    GWSchultz.com » Milling Formulas

    General Milling Formulas for Working with Carbide Tools, Engravers, End-Mills and Cutters

    To Find

    Using
    Formula

    SFM
    Surface Feet per Minute

    RPM – Revolutions per Minute
    Dia – Diameter of End Mill

    RPM ÷ 3.82 x Dia = SFM

    RPM
    Revolutions per Minute

    SFM – Surface Feet per Minute
    Dia – Diameter of End Mill

    SFM x 3.82 ÷Dia = RPM

    IPM
    Inches per Minute

    RPM – Revolutions per Minute
    IPT – Inch per Tooth, Chipload
    # FL – # of Flutes

    RPM x IPT x #FL = IPM

    IPT
    Inch per Tooth, Chipload

    IPM – Inches per Minute
    RPM – Revolutions per Minute
    # FL – # of Flutes

    IPM ÷RPM ÷#FL = IPT

    IPR/FR
    Inch (Feed) per Revolution

    IPM – Inches per Minute
    RPM – Revolutions per Minute

    IPM ÷RPM = IPR (FR)

    MR
    Metal Removal
    Cubic Inches per Minute

    ADC – Axil Depth of Cut
    RDC – Radial Depth of Cut
    IPM – Inches per Minute

    ADC x RDC x IPM = MR

    HP
    Horsepower Required

    IPM – Inches per Minute
    RDC – Radial Depth of Cut
    ADC – Axil Depth of Cut
    PC – Power Constants

    IPM x RDC x ADC x PC = HP

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    595 County Road 448
    Tavares, FL 32778


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