Electric Motor question

[mrjsl]

Does anyone here know about electric motors? I have an old GE motor my dad used to use as a drum sander. I tore it down and got all the sawdust out of it. I can make it run, but it does have a possible problem with the starting part. Once it gets going it will run all day, but with some vibration - like a possible bearing problem.

It's so old it doesn't show on the GE site.

If anyone here has any knowledge about old motors, I'll give you all the details. Basically I need to know about the bearing on the shaft end, and why the starting circuit would bog down until you give the shaft an assist by hand.

 

[krooser]

I'd find am electric motor shop and have 'em take a look... the old motors are far better than anything built in the last 10 years or so... I have motors that are 70 years old that still work perfectly and I'll fix 'em if they ever go bad.

 

[tonydanzah]

how do the brushes look and how does the area where the brushes ride look

 

[TheToolMan]

I run the electric motor repair shop at my work. If you would like I would be happy to take a look at it for you. It will only cost you shipping. You might be able to find something on our site as well
Here is my works website. www.plccenter.com
PM me some info on the motor.

 

[Kestas]

Are the bearings bushings or roller bearings? If they're roller bearings, they may have electrical damage from current leakage, which is somewhat of a common problem. I do forensic bearing analysis for a living.

Either way, as a last resort, have the motor rebuilt if that's what it needs. I've had motors rebuilt and it's not that expensive.

 

[kbs2244]

Your starting problem is most likely gummed up or pitted points in the starting switch.

If you feel comfortable taking it apart you will find a centrifugal switch at one end.
It gives extra current to get the motor started and then cuts out when the motor gets up to speed.

The switch can get gummed up with dust, especially in a sanding machine.

Some starting fluid as cleaner and some WD40 as lube will do wonders.
While you are in there run a finger nail file across the points to smooth them up.

I would guess gummed up dust is a big part of your running rough problem also.

I would bet a good cleaning is all she needs.