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Old 12-16-2009, 07:08 AM
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A true 1 HP motor produces 3 ft/lbs of torque at 1800 RPM, irregardless of how many amps it is drawing or what voltage it is being run at. Torque is proportional to speed, so that same motor running at 3600 RPM produces 1 1/2 ft lbs of torque. That same motor running at 900 RPM produces 6 ft/lbs of torque. That's why your drill press can go through more the slower it is running. If you have a true 3 HP motor running at 3600 rpm it is producing 4 1/2 ft/lbs of torque. You can change the torque your motor produces in two ways. You can either buy a motor control to change the speed of the motor itself, or you can change the ratio to the driven load through mechanical means like gears or pulleys.

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