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Taking it apart
Getting the bottom thrust bearing cap off
method of attachment? This cap doesn't want to unscrew. From this
point of view, we can't even see if it has threads. But I suspect that it
As it turns out, these are right hand threaded parts installed with a thread
sealant/thread locker. To remove: The motor casing was installed back into
the chassis with the four fasteners. This was done to improve leverage for
what was to come.....a strap wrench, used in conjunction with a heat gun to soften the thread sealant. Care was
taken not to heat the coils on the other side of this housing! With
moderate unwinding pressure the threaded cap broke free of its bond smoothly and
was then unscrewed.
A considerable amount of thread locker/sealant residue was found on both pieces.
Looking for evidence of wear
dimple in center indicates hard contact with the thrust bearing ball.
Looks like a straight thru bore.
bearing ball diameter on display
gaging the bore for size at the thrust end using this small hole gage made by
Starrett. I use this type when a dial bore gage, or air gage is not
It is a split ball design that makes a 2-point contact within the walls of the
bore and that also depends upon the user to develop a "feel" for
just the right amount of pressure to find correct size. But it is possible
to be accurate with one of these.
Then, when the size is found, one uses an outside mike to measure over the
split-ball to apply a value for the reading.
Getting a size at the top end of the spindle bushing.
Getting another read below toward the center region of the spindle
checking to see if splined ring will remove when the three machine screws are
It does not pull off the rotor assembly by hand pressure.
checking shaft for size/wear
packed up for now
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