Grinder torque vs hp rating etc.

If I were you I would not use a belt and pulley to get more torque. I have a 2 hp motor with belt and pulley and am always stalling the grinding belt due to the drive belt slipping. An upgrade in the future for me is to get rid of the drive belt and drive the grinding belt directly.

Motor Power = (Torque X rpm)/5252, torque is in lb-ft. So if constant power if you double the speed you will decrease the available torque. There are also mechanical and electrical inefficiencies sapping system power as well.

Adding a speed reducing pulley will increase torque but the power will remain the same.
 
Thanks, I agree with that.
The next one will be direct drive with the 3450 rpm motor and a 4inch drive wheel mounted on the motor output shaft. By my math that should give me 3600SFPM, so right in the ballpark for a single speed machine. I ran a 3/4 HP 2x36" at 5000+SFPM for years and it worked, but this new machine is so much better(until I kill my batteries in the middle of a finish grind:grumpy:)



I'll get it sorted out.
Thanks,
Darcy
 
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you didn't say if you are using 3 or 1 phase motors.

For the purposes of saving power you wan't to run the lowest motor horsepower you can get away with. Whether you use all 2 horses in a 2Hp motor or not, you are powering 2 horses when it runs.
 
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