Calculating Speeds and Feeds

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Calculating Speeds & Feed Rates Formulas Spindle RPM RPM= 4CS D CS material cutting speed in surface feet per minute/meters per minute (sfm/mpm) D diameter of the part turning or diameter of the cutter milling Feed rates per inch Lathe Feed (in/min) =rpm x r r = feed rate in inches per revolutions (ipr) usually 0.001-0.020 ipr Mill Feed = rpm x T x N T= chip load per tooth N= number of teeth on cutter Feed rate (metric) Lathe Feed (mm/min) = rpm x r r = feed rate in mm per revolution Mill Feed = rpm x T x N T = chip load per tooth N = number of teeth on cutter

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Transcript of Calculating Speeds and Feeds

  • Calculating Speeds & Feed Rates

    Formulas

    Spindle RPM

    RPM= 4CS

    D

    CS material cutting speed in surface feet per minute/meters per minute

    (sfm/mpm)

    D diameter of the part turning or diameter of the cutter milling

    Feed rates per inch

    Lathe

    Feed (in/min) =rpm x r

    r = feed rate in inches per revolutions (ipr) usually 0.001-0.020 ipr

    Mill

    Feed = rpm x T x N

    T= chip load per tooth

    N= number of teeth on cutter

    Feed rate (metric)

    Lathe

    Feed (mm/min) = rpm x r

    r = feed rate in mm per revolution

    Mill

    Feed = rpm x T x N

    T = chip load per tooth

    N = number of teeth on cutter


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