Grinder motor question

A

AWGunS

Joined
Sep 16, 2006
Messages
616
I have a Leeson 1.5hp 220v motor connected to my KMG via the 3 step pulleys.

Running it today, just practicing bevels for probably 2 hours, but not continuously with belt changes, taking the dog out, the usual stuff. Touched the shaft side of the motor and it was hot- hot enough you could not keep your hand on it. It is rated for continuous operation, but I didn't think it would get that warm. Normal, or should I be concerned?
 
If the motor casing wasn't as hot, or hotter, than the shaft you probably don't have a problem.
The pulley makes a good deal of friction with the belt and gets very hot after an hour or two of running. That heat transfers to the motor shaft. If the motor has sealed bearings ,and they are in good shape, I wouldn't worry about it. To test this theory out, disconnect the belt and run the motor for an hour with no load. If the shaft is hot, there is a problem with the bearing. If it is normally warm, hook the belt back up and don't worry.

The only other thing to check is that the belt tension isn't too tight....or too loose. Too tight can put a serious side load on the motor. Some motors are only intended for torque loads, not side loads. I don't know what type of motor you have, so It is hard to say about the bearing grade and torque rating. Rule of thumb is make the belt tension just tight enough to avoid slipping.....which can also make the pulley very hot.
 
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