Re: How can you test a stepper ?

Hi Bob,

Nema23 works fine.
Nema34 whirrrs and clicks, but does not spin.

Slo-syn Model M091 NEMA34, 1.7V 4.2 A (6 wire)
Slo-Syn Model M091-FD-440, 1.7V, 4.7A (6 wire)
Pac-Sci Signamx. 2.98 4.2A (8 wire)

I have 2 of each of these.
My 2 NEMA23's work, my 6 NEM34's don't.

Each unit shows relitivly colose resistsance, but are less than 1 ohm
and my meter only does one decimal so I'm not sure if they are
exactly identical. the 6 wire units does show the high ohms at the
ends with about half from center to end(s)

I also have one Astro-Syn, same ratings, but had a bad bearing. I
replaced the bearing and the unit is still locked up, so I put it
aside.

I got these as pulled from equip. One had some sort of oil inside
and they all had a gasket to keep the oil out. is it possible that a
thin coating of oil on the coils might mess things up ?

Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Robert Campbell" <bob@c...>
wrote:

> Dave,
>
> I would assume that you have done all the tests.
>
> Is the red light on, on the Gecko?
> If power is on can you still turn the shaft without any resistance?
> Do you have 5 volts from pin 10 to the PC ground?
>
> The winding resistance on each pair should be about .4 ohms.
>
> The 5 volt supply is the most likely.
>
> Bob Campbell
>
>
>
> ----- Original Message -----
> From: <davemucha@j...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Sunday, February 09, 2003 12:06 PM
> Subject: [CAD_CAM_EDM_DRO] How can you test a stepper ?
>
>
> > I am banging my head against the wall.
> >
> > I have a simple unit, 32V power supply
> > gecko 201a
> > NEMA34, single stack and cannot get any movement.
> >
> > Is there any way to test a stepper to see if it is bad ?
> >
> > what would make a stepper go bad ?
> >
> > Dave
> >
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,

wanliker@a...,

> timg@k...
> > Moderator: pentam@c... indigo_red@q... [Moderators]
> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to

reach it if

> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this

to be a

> sister site to the CCED group, as many of the same members are

there, for OT

> subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY

POSTING THEM.

> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> > bill
> > List Mom
> > List Owner
> >
> >
> >
> > Your use of Yahoo! Groups is subject to

http://docs.yahoo.com/info/terms/

> >