On Jan 4, 4:51*am, Dar wrote:
Now I have a 1/2 hp , 247 in. lb torque, ac gearmotor *that bogs down
under
the loads I need it for , and I need a bigger motor. *I found another
1/2 hp motor
that has 487 in lbs , but am not certain *that the higher torque
rating alone is
enough. So the question is : what is the relationship between hp,
torque, and actual
ability to perform high-load operations ?. This is (to be) set up
powering a rolling mill.
It was suggested that I get a .75 or 1 hp motor , but...

thanks,
Dar

There is a table of torque, horsepower and RPM in the "POCKET REF",
page 126. It begins at 1 HP but you could divide the 5 and 7.5 entries
by 10. Torque in inch-Lbs = (HP * 63025) / RPM.

Turn the mill with a torque wrench to see how much you need.

jw