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]