I found some time to remove the motor and run it off the machine. The noise is not coming from the motor and the spindle seems alright. After reassembly the sound returned. It must be the belt.
Your quick responses may eventually save someones machine from an expensive failure. Thanks
Alan
--- In GrizHFMinimill@yahoogroups.com, "bbass408" <bbass408@...> wrote:
>
> Get one of these car stethoscopes from HF for 4.00:
> http://www.harborfreight.com/mechanics-stethoscope-41966.html
> They end up being invaluable for solving the "where's that sound coming from" problems. It also might not be an arc -- although it probably is. Sometimes people get little bits of who-knows-what on the top of the bearing the motor's shaft goes down into which might make some weird, high pitched noised. But, the earlier advice to check the rotator sounds good.
>
> --- In GrizHFMinimill@yahoogroups.com, "qunungnauraq" <qunungnauraq@> wrote:
> >
> > Do the sounds happen when The motor isn't turning? If so,mine has done that occasionally since it was new. It seems to happen When he speed control is powered up but the motor is powered off.I always considered it leakage from the speed control.Other than that I have not had any problem with the mill in the 12 years I've had it.
> >
> > --- In GrizHFMinimill@yahoogroups.com, pc <akayton1@> wrote:
> > >
> > > Arcing sounds from there would indicated a damages rotator. The best
> > > would be the pull the motor and open her up. The windings may have been
> > > damaged. If that is the case then a replacement motor or rotor is the
> > > only repair.
> > >
> > > Cheers,
> > >
> > > Andrew in Melbourne
> > >
> > > On Sat, 2012-01-21 at 19:44 +0000, miner49r wrote:
> > > >
> > > > This morning I started hearing noises from my mill. It sounds like an
> > > > arc of electricity jumping across a spark plug. At first the sound was
> > > > intermittent but has gradually become more consistant. I pulled the
> > > > brushes and there is no sign of arcing there.
> > > >
> > > > This sparking noise seems to be comong from the lower end of the
> > > > motor. Has anyone here experienced this symptom and know of a repair
> > > > fo it?
> > > >
> > > > Thx, Alan
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
>
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