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n = Speed of ball mill in rpm. Example ... Nc = Critical speed D = Internal dia in ft.4/9/2015 Jyoti Ceramic ... Documents Similar To ball mill calculations.

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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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#### Mill Critical Speed Calculation

Enter the width of a mill shell liner. Note this is not the width of a lifter! You may use the Mill Liner Effective Width calculation to determine this value. The mill critical speed will be calculated based on the diameter (above) less twice this shell liner width.

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