Theformulatocalculate critical speedis given below. N c = 42.305 /sqt(D-d) N c =critical speedof themill. D =mill diameterspecified in meters. d = diameter of theball. In practiceBall Millsare driven at aspeedof 50-90% of thecritical speed, the factor being influenced by economic consideration.
Get a QuoteBall mills have been successfully run at speeds between60and90 percentof critical speed, but most mills operate at speeds between65and79 percentof critical speed. Rod mills speed should be limited to a maximum of70% of critical speed and preferably should be in the60 to 68 percentcritical speed range.
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Get A QuoteThe point where themillbecomes a centrifuge is called the "Critical Speed", andball millsusually operate at 65% to 75% of thecritical speed.Ball Millsare generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns.
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Get A QuoteABall Millgrinds material by rotating a cylinder with steel or ceramic grinding balls, causing the balls to fall back into the cylinder and onto the material to be ground.Ball Millshave been successfully run at speeds between 60 and 90 percent ofcritical speed.However, mostBall Millsoperate at speeds between 65 and 75 percent ofcritical speed.
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