Last summer, I purchased the Grizzly G9922 Oscillating Spindle
Sander. All seems kosher except, to my ears, it makes the worst
undulating grinding noise. I can't really describe it except that
sounds like a low growl. I called tech support and was told to take it
all apart and strip everything off down to the motor and run it. If it
still makes a horrible noise, they will send a new motor. After doing
so,it didn't seem too much different. A little less reverbatory, but
still I get the feeling it isn't supposed to sound this way! The
problem I'm having, of course, is that I really don't know what these
machines are supposed to sound like. The machine seems to work fine,
but I want to be sure there is nothing wrong. Are Spindle Sanders
inherently unpleasant in their sonorous attributes. Is the Grizzly
G9922 prone to noise problems. How can I really tell if I have a
bearing problem or not? Thanks for your observations!
I have the Delta B.O.S.S and it is very quiet and I'm very happy with it and
the job it does for me. I do have several Grizzly tools which I'm very
happy with. Sounds like you may have a problem that Grizzly will fix. At
least they have sure been good to me.
Al in WA
I have the same machine, and yes, mine makes a lot of noise. I think that the
sound generated by the mechanism that moves the spindle up and down is
amplified by the sheet metal cabinet. Of course, the shape of the cabinet does
not help with the noise. It is kind of like a big megaphone. :-)
On 22 Oct 2004 17:58:15 -0700, firstname.lastname@example.org (mrmortise) wrote:
New Eagle, PA
Sheetmetal issues can be handled quickly and easily with an
application of a sound deadener sheet. I watched the guys at
the body shop install them on door panels and asked what they
were. It's made with a rubbery glue attached to a 4x6 sheet of
aluminum which is simply stuck onto the center of the sheetmetal
panel. The rubbery glue absorbs the noise.
Link belts also remove a lot of the noise associated with power
conveyance. Do that first, then see how much noise is left and
go from there. (Oops, not on this model, but for all other belt-
"If the promise of the Declaration of Independence is ever to be fulfilled,
it will be the Libertarian Party which fulfills it. If the Constitution is
Aluminium ? Usually lead, when I've used them. Cars are generally
just plain rubber, which stops the panel "drumming". If you're trying
to stop noise being transmitted through the panel (like a boat engine
room bulkhead, or a machine case, then a rubbery isolator and a
_heavy_ stiff sheet are more effective. I'd expect aluminium to be
too light to really be much use, if you weren't being really
You can make your own pretty easily. Roofing lead sheet and a layer
of something thick and rubbery, like windowframe mastic.
You able to move the motor shaft forward or aft with hand pressure? Can you
do the mechanic's trick of placing a screwdriver point on the bearing case
and putting the handle to your ear? Bearings rumble, and when bad, heat.
You can check that oscillation mechanism to an extent by checking vertical
travel of the drum with power removed. Worn worm gearing will give a
greater range of movement than the merely perceptible which it should have.
If you stop it in a few different positions and change, you may catch a bad
tooth by differences.
Runout on the drum would be a clear indication of problems with the spindle
Does anyone look before they answer?
Not too clear on what happed with the noise when you tore down. Did it
still make noise with motor only or after assembly?
Reason I ask is I have a the smaller Jet JBOS-5 for a couple of years and it
is a very quiet machine. However this summer, it seemed to take on a
different sound - a slight growling vibration. When I lifted it off of it's
table I just happened to see a TINY setscrew on the tabletop. I dug out the
parts diagram, searched for setscrews, and located one missing from the
mechanism that moves the spindle up and down. This screw secured one of two
eccentric levers, one on each side of the spindle shaft, to a separate
rotating shaft. The loose lever was grabbing and shaking as the other moved
the mechanism up and down. This small vibration was amplified through the
sander and table.
I suspect all of these mechanisms are similar. Might look for loose
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