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The critical speed of a ball mill is calculated as 54.19 divided by the square root of the radius in feet.

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This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

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Ball Mill Operating Speed - Mechanical Operations... Sep 11, 2014 ... Calculations: The critical speed of ball mill is given by,. where R = radius of ball mill; r = radius of ball.

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Calculations: The critical speed of ball mill is given by, where R = radius of ball mill; r = radius of ball. For R = 1000 mm and r = 50 mm, n c = 30.7 rpm.

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