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
appreciate it?
On May 30, 8:48 pm, "Sac Dave" <[email protected]> wrote:
> "Nova" <[email protected]> wrote in message
>
> news:[email protected]...
>
>
>
> > Sac Dave wrote:
>
> >> 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 appreciate it?
>
> > 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
> > installed.
>
> That's a good point I'll try the key first it did slip in place pretty
> easy maybe to easy. Thanks
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
shaft.
Just a suggestion.
D'ohBoy
"D'ohBoy" <[email protected]> wrote in message
news:635a011d-cb25-40c0-b323-fd37aba9ddaa@t10g2000vbg.googlegroups.com...
> On May 30, 8:48 pm, "Sac Dave" <[email protected]> wrote:
>> "Nova" <[email protected]> wrote in message
>>
>> news:[email protected]...
>>
>>
>>
>> > Sac Dave wrote:
>>
>> >> 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 appreciate it?
>>
>> > 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
>> > installed.
>>
>> That's a good point I'll try the key first it did slip in place pretty
>> easy maybe to easy. Thanks
>
> 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
> shaft.
>
> Just a suggestion.
>
> D'ohBoy
The fist time I took it apart the sheave set screw was lose. I even used
lock-tight on it the second time .
"Nova" <[email protected]> wrote in message
news:[email protected]...
> Sac Dave wrote:
>
>> 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 appreciate it?
>>
>>
>
> 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
> installed.
>
That's a good point I'll try the key first it did slip in place pretty
easy maybe to easy. Thanks
Sac Dave wrote:
> 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
> appreciate it?
>
>
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
installed.
--
Jack Novak
Buffalo, NY - USA
[email protected]