In article ,
Mike Henry wrote:

[ ... ]

I've no clue on what changed unless maybe the grease in the motor bearings
suddenly re-arranged itself for more complete lubrication. The grinder was
bought used from a dealer and I don't know how long it sat before it arrived
here. It's had about 10 hours of run time since arrival.

Or perhaps some swarf was cushioning the support, and that was
displaced when you adjusted it.

[ ... ]

"Belt tension should be such that the belt between pulleys may
be compressed to within one inch of touching. This is rather
loose, and should be so."

I don't know how this may apply to your machine, as it is a
different size and a different manufacturer.

KO Lee tells me that this motor (GE K163) is the one that they installed on
surface grinders (although they now specify 2 HP instead of the 1 HP on
mine), that they do not specify any special sort of balancing and that the
(2) belts should be adjusted so that there is about 1/8" "give" when pressed
from the side. The tension was a lot less in my tests the other night so
I'll play with the tension a bit to see how that affects things.

The tech support guy seemed pressed for time and was not interested in any
kind of detailed answers, so I'm not feeling any better informed than
before.

Well ... at least you now know what the tension should be for
your machine. Are those flat belts, V-belts, or something else, like
perhaps poly-V belts? It sounds like V-belts just offhand.

Good Luck
DoN.
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