the formula used for Critical Speed is: N c =76.6(D-0.5) where, N c is the critical speed,in revolutions per minute, D is the mill effective inside diameter, in feet. source: SME Mineral Processing Handbook, Page 3C-4. Disclaimer: USE AT YOUR OWN RISK. Neither the author nor the web host will accept any responsibility for loss or damage caused by use of this program. The program has not been ...

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