Re: Encoder Indexer Option --- opening up steppers.......and modfying shafts...

C'mon Guys,
If you had a set of spark plugs for your car, and they were
the wrong size, would you pull the heads and remachine them to fit
the plugs? I don't think so.

Marv Frankel


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
<braidmeister@y...> wrote:

>
> ...and others would just buy a 5/8" encoder :)
>
> I didn't want to take apart a new motor...or anyone of them for the
> simple fact that...yes, I know I can be ham fisted at times...and
> have scraped the magnets against the rotor before. I wanted to

avoid

> machining anything...mainly because I don't have a lathe.
>
> -Brady
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> <dave_mucha@y...> wrote:
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers

<rogersmach@y...>

> > wrote:
> > > I've never heard of that not touching the magnets deal. Sure
> > wouldn't operate like that. I had all mine apart to remove the
> brakes
> > and the armature and magnets touched. Didnt seem to impede them

in

> > any way. Maybe it is a no-no. But, I find it hard to understand.

I

> > could see a long period of time being detrimental.
> > >
> > > Ron
> >
> > The motor de-rating has been documented for stepper motors by
> Mariss,
> > who also has a very accurate means of testing torgue.
> >
> > The big deal with steppers also comes into play about how ham
> fisted
> > we are. dragging the rotors and stators against the case and
> magnets
> > is almost a forgone conslusion unless you have some means of
> > maintaining the alignment axialy.
> >
> > The bits of scrapings then effect the health of the motor and

tend

> to
> > bind and scrape and make more bits that bind and scrape....
> >
> > as for 5/8 shafts and encoders.....
> > Many of us with lathes would be more than happy to pull the motor
> > apart and turn down the shaft. Others would just make a sleve
> with
> > a 1/4 post to slip over the shaft. still others would drill and
> tap
> > and thread in a 1/4 shaft, while others would just drill and ream
> and
> > use some bearing locking stuff to permanently attach the small
> shaft.
> >
> > It's part of the fun part of the whole machine building process.
> >
> > Dave