### How To Calculate Rpm Of A Motor To Ball Mill

Ball mill calculation kw and rpm - youtube. 15 oct ... ball mill calculation kw and rpm more details: ... mill pinion to drive motor-[crusher and mill] ball mill hp motor speed 990 rpm mill speed.Ball mill operating speed . -6-13the critical speed of ball mill is given by, where r = radius of ball mill; r = radius of ball. for r = mm and r = 50 mm, n c = 30.7 rpm. but the mill is operated at a speed of 15 rpm. therefore, the mill is operated at 100 x 15/30.7 = 48.86 % of critical.