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combining this design criteria with the pinion/gear efficiency (use 0.985 for a synchronous motor, pinion and gear; use 1.000 for gearless) provides the following equation to estimate the motor size for a gear driven sag mill: total sag motor power = (esag × tonnes/hour) ÷ 0.985 ÷ 0.90 (9) the ball mill motor can be sized using a

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the operating principle of the ball mill the operating principle of the ball mill consists of following steps. in a continuously operating ball mill, feed material fed through the central hole one of the caps into the drum and moves

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