mill formula for operating speed

For R = 1000 mm and r = 50 mm, n c = 30.7 rpm. But the mill is operated at a speed of15 rpm. Therefore, the mill is operated at 100 x 15/30.7 = 48.86 % of critical speed. If 100 mm dia balls are replaced by 50 mm dia balls, and the other conditions are remaining the same, Speed of ball mill = [0.4886/ (2 p)] x [9.812/ (1 - 0.025)] 0.5.

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