#### How To Calculate Optimum Milling Speed From Critical Speed

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Mill Critical Speed Determination. The "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface. This is the rotational speed where balls will not fall away from the mill's shell.

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The point where the mill becomes a centrifuge is called the "Critical Speed", and ball mills usually operate at% to% of the critical speed. Ball Mills are generally used to grind material/inch and finer, down to the particle size oftomicrons.

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#### How To Calculate Optimum Milling Speed From Critical Speed

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