Does the horsepower rating of a gearbox depend on the input speed from the motor? Most catalogs seem to have the ratings based on an input speed of 1750 rpm. I'm driving my gearbox with a 1000 rpm motor. My gearbox is rated for 3/4 hp and I'm driving it with a 3/4 hp motor. I'm concerned that since I'm driving the gearbox at a lower speed with the same horsepower, more torque will be developed internally. Are gearboxes truly rated for input power, or are they rated for input power at a certain speed?
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