[TR] off-topic - fixing damaged electric motor shaft

[aribert at c3net.net]

You need bigger tools - a lathe (or a buddy that has one).  Myself, I
would remove the armature from the motor, turn down the shaft to clean up
the damage and (assuming that I already had the pulley) turn a bushing to
make up the difference btween the pulley bore and the now smaller shaft
dia.

Without that, you could try to run the motor w/o the pulley and hold a
file to it (place the file so that the shaft will pull the file *away*
from you) and knock down the high spots. Not having seen the damage, I am
guessing that the motor shaft is already a bit undersize before you even
knock down the high spots.  I think you will still have a shaft that is
undersize relative to your pulley bore and one that will not run true.




> Sorry for off-topic, but this seems down the alley for some of the
> listers.
>
> I have a 1/2 hp electric motor on my belt-driven furnace blower. Last
> winter
> the pulley loosened up and spun and rattled around doing a fair bit of
> damage
> to the 1/2" shaft before coming off. I got a new pulley of course, but it
> does
> not sit evenly any more and the wobble as it turns is causing a vibration
> in
> the fan that is quite irritating. The shaft is a straight 1/2" with a
> flatted
> section. Of course the flat is good, it is the round part of the shaft
> that is
> chewed up. The motor is almost new and I would like to avoid buying
> another
> one if I can find a way to smooth the surface or similar so that the
> pulley
> sits normal to the shaft.
>
> Does anybody have any experience with this sort of issue?
>
> If I can save the motor, then I can buy a nice TR6 bonnet liner. If not,
> then
> I will have quiet in the house to sit and contemplate the hidiousness of
> the
> underside of my car's bonnet. Presently can't work due to rumbling of
> furnace
> and snarling of wife.
>
> Mark Hooper