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I have a friend that is going to 'revamp' an older style, cast iron  hand crank grinder with a 3/4 HP motor.


Now the motor turns at about 3400 rpms and he has on order a pulley that will fit the grinder shaft.  The problem that I see is that the grinder will be turning at about 850 rpms.


To me that seem a bit too fast, I'm thinking about 300 to 350 any thoughts??


TIA Larry

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