Hey All, I have an old Baldor bench grinder. Probably 70 years old or older. The motor is the type that uses a capacitor for starting and running. There is no centrifugal starting switch. I know this type of phase making scheme provides lower torque for starting so that the motor takes longer to come up to speed. But this grinder takes 5 seconds to reach operating speed, 3400 rpm. I replaced the bearings in the motor and it now spins very easily. There is a 3/4 wide 6 inch grinding wheel on one side and a light weight 6 inch diamond wheel on the other side. The cap in the thing might be the original cap. It is a large round tinned metal can with solder lugs. 330 volts and 400mfd. Could it be that it needs a new cap? I don't know what kind of cap it is. Oil filled I imagine but from the high mfd campared to all my other run caps could it be an electrolytic cap? There is no sign of leaking and there are two places on the top of the cap where it looks like holes were sealed with solder. Thanks, Eric
- posted
7 years ago