Re: [CAD_CAM_EDM_DRO] Roller Bearings link ? ( was Bad Bearing ( was Re: stuck stepper

----- Original Message -----
From: "markpowerplus" <mabw@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 12, 2002 2:38 PM
Subject: [CAD_CAM_EDM_DRO] Roller Bearings link ? ( was Bad Bearing ( was
Re: stuck stepper


> morning all!
> Have you tried Boca Bearings or Stock drive products?
> cheers
> Mark--- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...>
> wrote:
> > Hi All,
> >
> > The bearing in the stepper went south.
> >
> > it is an R1-1438HH NMB
> > 3/8 bore, 7/8 OD, 0.3" thick.
> >
> > McMaster has similar bearings but this is
> > slimer than a standard electic motor bearing.
> >
> > I also noticed that the bearing should slip in the housing
> > and is not a press fit. there were a couple pressure washers
> > holding it in place.
> >
> > I guess taking one of these puppies apart is how to learn just
> > what makes them tick.
> >
> > A google search of ball bearings, roller ball bearings, roller
> > bearing, yadda yadda yadda keeps turning up links but none that
> offer
> > a selection guide.
> >
> > Anybody have a link to a selection guide ?
> >
> > Dave
> >
> >
> >
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...>
> wrote:
> > > Hi All,
> > >
> > > Thanks for the insight.
> > >
> > > I decided that since it was stuck that I could not damage it by
> > > opening the case.
> > >
> > >
> > > Got a fresh rag, washed all the metal chips off my hands,
> cleanded
> > > the workbench, then swiped a magnet over it just in case.
> > >
> > > I opened the case.
> > >
> > > What I found was that the part of the rotor that I could see
> looked
> > > dirty, little like black dust. immeadiatly, I noticed the rear
> > > bearing was loose in the race.
> > >
> > > Inspection showed the bearing had failed, then the rotor had been
> > > making contact as it was spinning. Wear was evident in both the
> > > rotator and stator.
> > >
> > > I'll get a new bearing to see if it will come back to life, but
> not
> > > count on it for any critical applications.
> > >
> > > I am reviewing the idea of using a NEMA23, double/triple stack
> > > instead.
> > >
> > > Thanks again.
> > >
> > > Dave
> > >
> > >
> > >
> > > End of mystery.
> > >
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
> > > > In a message dated 9/11/2002 7:43:12 PM Central Standard Time,
> > > > davemucha@j... writes:
> > > >
> > > >
> > > > > There is some slight play with about 15 degess of motion in
> one
> > > spot
> > > > > so I assume that it might be physical and not electronical.
> > > >
> > > >
> > > > Yeah, that sounds like a chip of magnetic material "toggling"
> in
> > > a "magnet
> > > > tooth slot" in there.
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
>
>
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