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Reply by Minorhero

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Posted on New here with a few table saw motor Qs...

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Minorhero

199 posts in 1236 days


#1 posted 1091 days ago

I like to restore old woodworking machines so I have taken apart about a dozen motors thus far. My typical procedure when I get a new machine is to take the motor and machine apart and replace the bearings. Most companies say their bearings are “sealed for life” but that really translates into about 10 to 20 years of use depending on how hard you use it. To replace the bearings you are going to need a bearing puller, I like the kind that has 3 jaws. You can pick one up for about 30 dollars at your local chain auto parts store.

As for the pulleys. I would pull both of them and look at where they are connecting under the set screw. To throw the entire pulley off 1/16” it would have to be really really chewed up down there. More likely you just have bad pulleys (or perhaps the previous owner used the wrong size pulley? is there a lot of slack when the pulley is on the shaft?). Good thing is that pulleys are really pretty cheap. I tend to buy mine from McMaster Carr. Just measure your outer and inner diameter and make sure you have the right belt size. You should be able to pick up new ones for around 8 dollars a piece.

If you are seeing a lot of run-put on the saw blade that means either 1) your bearings are bad or 2) your arbor is bent.

Best case scenario, its your bearings and you just replace them (I buy rubber sealed bearings for all my replacements also called 2RS – so look at the numbers on your bearings and if for example they are 6202 bearings then buy 6202-2RS). Worst case scenario is that after you replace the bearings you still have a lot of run-out then its probably your arbor. You can buy replacement arbor assemblies for that machine but according to the parts sites it will cost you about $115. You may find it cheaper on ebay or from someone parting out their machine.

As for the “whispering noise” that does not much concern me unless it sounds like metal is actually being ground away. Some motors are just noisier then others.


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