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

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]