Gunner Asch on Thu, 31 Oct 2013 06:42:24 -0700
typed in rec.crafts.metalworking the following:
On Thu, 31 Oct 2013 07:22:28 -0400, Stormin Mormon
wrote:

On 10/31/2013 12:49 AM, Gunner Asch wrote:

If the motor is tied directly to the spindle..remove the motor and
run. If you still hear the squealing..check the sheetmetal around the
fan and see if it got dented. If it still squeals...hold a long screw
driver to the bearing areas on each end and put the screw driver
handle in your ear for a stethescope.

If it comes from the spindle...pull the bearings AND MAKE A DRAWING of
it being disassembled (or take photos as you remove each part) and
order and install new bearings

Gunner

As an old man who grew up in the shadow of The Great
Depression, I'd use solvent of some kind, and clean
out the old bearings. Regrease them, and see if that
helped. I do think the drawings and photos are
excellent idea.

True indeed. However...if it was surplus machinery..it probably had a
hard life..and more than likely cleaning and greasing old bearings
will increase the lifespan a small amount..but not really "fix" the
propblem. Shrug...When I fix a clients machine...I avoid putting
bandaids on them..I fix them properly so it has a much much longer
life span.

For a hobby shop..your method will probably be viable.

The general rule of thumb, especially for commercial operations,
is that as you have it "open" now, might as well replace the
'marginal' bits while you can.
I.e., when replacing the throw out bearing on a clutch, it really
doesn't make a lot of sense to decide the old clutch has a few
thousand more miles on it, and put it back in.
You tear a machine apart, you replace bearing/seals putting it
back together. Save having to shut down and do this all over again
"soon."
Of course, some of that is a judgment call. "Can I afford to be
cost effective?"
--
pyotr filipivich
"With Age comes Wisdom. Although more often, Age travels alone."