I have a Powermatic 66 I bought new in 98. There seems to be a vibration or
knocking sound that started a couple months ago. After finally getting
around to investigating the sound the Sheave arbor (fan belt pulley) as they
call it was lose. I removed the pulley did not see any damage remove the
arbor assembly bearings seem alright. So I reassembled everything turned it
on everything sounded fine once I installed the blade the sound returned ,
removing the blade did not help the sound was still there. I did the whole
procedure twice both times the saw sounded fine until I installed the blade
I did use another blade for the second test. I did run the motor each time
by itself no belts it sounds fine. The arbor and bearing assembly fell fine
but all I can think is that's were the problem is. So at this point I'm
thinking replacing the Sheave as a starting point it was lose for quiet
awhile. If anybody has any suggestion of what else might be wrong I'd
Is there a shear key associated with the sheave? If the sheave was
loose the key may be worn and the problem is showing up only with the
extra force required to overcome the inertia on spin up with the blade
If there are set screws in any of your pulleys, make sure that they
are all *tight*. I had a problem where the thunk wouldn't happen
unless the belt was on. And I couldn't wiggle the pulley on the
Just a suggestion.
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