Mill Revolution Calculation Nkish In Malaysia. to calculate the feed rate, use the following formula: f = n f r (eq. 3) where . f = calculated linear feed rate of the drill [in/min] n = spindle speed [rpm] f. r = feed per revolution of the drill [in/rev] in addition, the following rules of thumb should be observed when applicable: always . start with a slower speed (~50%) and build
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