Reply by MrUnix

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Posted on Table Saw died

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7038 posts in 2397 days

#1 posted 03-09-2015 08:33 PM

LOL.. if the magic smoke escapes, it’s toast. Usually means that the windings have been fried or something else has worn to the point of shorting out. It can be rewound, but that is a pricey proposition. However, if it still runs, even if sparking a bit, it usually can be salvaged, and is usually a bad bearing that is letting things get out of tolerance. There really isn’t much that can go wrong with an electric motor except the bearings, and once they get too bad off, it can cause lots of damage/destruction. When they ‘rebuild’ them, usually all they are doing is cleaning it up and replacing the bearings.

As for motor shops, they still exist. We have one locally and I’m not in what most would consider a large city by any stretch. Most alternator/generator shops will also do electric motors. I have visited our local one a time or two, but looking for parts such as a replacement spring for a centrifugal switch or a spring washer. Usually, they will dig through their pile of old dead motors to find one and give it to me for free.

For the Unisaw, or any used machinery with an unknown past, it’s usually best to replace the bearings before doing anything else with it. Not knowing how much use/abuse it may have received over it’s lifetime or when the bearings were last replaced, if at all, can cause all sorts of damage down the road if they are questionable. It’s really cheap insurance, and worth the effort even if things appear to be just fine. In the Baldor that I just replaced the bearings on, it ran and sounded perfect.. no signs of any problem at all. But once I opened it up, this is what I found:

It was leaking grease big time; and while it still worked fine, it would have been toast pretty quickly with any kind of use. Had I left it alone, it may very well have caused some serious damage that would be much more expensive to fix than the $17 I shelled out for new bearings. Just saying.


-- Brad in FL - In Dog I trust... everything else is questionable

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