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I definitely think you should take a close look at it. As Jim has mentioned, it could be a belt or a bearing. I am more inclined to think it could be bearings in the motor, but could be in the arbor as well. Take the belt/s off of your saw and inspect the belt for cracks or chunks chipped off. While you have the belt off, remove the blade and check the arbor. Check to be sure it spins freely with out any roughness. Also, check the arbor to see if it will move up or down any. If it either has up or down movement or roughness in it's rotation, there is a problem in the bearing and you should do something about it immediately. If the bearing should happen to sieze up in use, it could be very difficult to repair or worse it could come apart and really mess some things up. Do the same check on the arbor of the motor. If the bearings of the motor are either rough or have play, get the motor to an electric motor shop to fix them. If it were the arbor, you possibly would have noticed this in the way of rough cuts, but the motor or belt might not directly be seen in quality of your cuts.
 

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Discussion Starter · #4 ·
I'll look at the bearing and arbor. The belt is good, just replaced it. I got the saw a few months back and it had been sitting for a very long time (over ten years I was told). It sounds like it might be a bearing since the cuts I am getting a great.
 

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Also I would check and make sure that there are no loose bolts anywhere in that saw as sometimes when the saw is spinning down it can find a point of resonance where some loose parts can accentuate the normal vibration pattern of the saw.

Check the suggestions given by the other posts and also check for any loose parts.

Be safe….
 

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Discussion Starter · #7 ·
Jerryz was right! I checked the bearings and they have no play and spin reasonably free. There is a dust shield that vibrates really bad whent he saw stops. Thanks to everybody.
 

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Mine rumbles a little when I turn it off too just before it stops. I was told it's the breaking mechanism and not to worry about it. Like you, the blade spins freeling, straight and true, so I feel it isnt a bearing etc.
 
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