Re: [CAD_CAM_EDM_DRO] Re: Stepper Dissasembly

Hi:

Just my two cents worth...Never listen when someone tells you something is
junk. I have dissassembled and fixed just about anything including countless
items that are "Do not take apart. It will never reassemble" able. I have
taken apart dozens of stepper motors, reassembled, and run them for lengthy
periods of time with no noticeable problem. Its the same thing with rewiring
the SloSyns, some folks said, they will never work, you'll only get one RPM,
You'd need 400VDC, the formula's prove.....etc.
I just sit and watch them work great and smile.
The only rules in hacking something together is...there are no rules. If it
works, it works, if it don't, you learn something. Just don't let the smoke
out, its hard to buy surplus smoke to replace it with.

Art

----- Original Message -----
From: <stratton@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 29, 2001 5:08 PM
Subject: [CAD_CAM_EDM_DRO] Re: Stepper Dissasembly


> Please elaborate on how damaged motors 'murder drives'?
> Do they generate excessive back EMF or something?
>
> My limited experience with small chopper drives is that they don't
> seem to care if you short the outputs... they just produce very short
> chopping pulses.
>
> As for why it was in the trash, academics throw out lots of stuff,
> especially when their lab space is being renovated. So it is an open
> question... I got a lot of goodies from that lab though.
>
> thanks,
>
> Chris
>
> -- In CAD_CAM_EDM_DRO@y..., mariss92705@y... wrote:
> > Hi,
> >
> > Option (1) is my choice.
> >
> > If the rotor has been removed, it is probably de-magnetized and it
> > will murder drives. Also it is tough to tell if it has a shorted
> turn
> > in the winding. The givaway is increased detent torque over a good
> > motor. This will also make it a serial killer of drives. It probably
> > was in the trash for a reason:)
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., Chris Stratton <stratton@m...> wrote:
> > > I've got another size-34 stepper from the trash at MIT, this one
> > > without a backplate on it. Electrically it is fine. So I
> machined
> > up
> > > a replacement backplate, however the rotor binds in some
> positions.
> > >
> > > Should I:
> > >
> > > 1) use it as a paperweight
> > > 2) make another backplate with some means of centering the bearing
> > > 3) pull out the rotor (possibly weakening magnets?), clean, and
> > maybe
> > > take a very light cut on it in the lathe?
> > >
> > > I realize neither 2 or 3 is going to yield a great motor, question
> > is
> > > if it will yield something more than a paperweight.
> > >
> > > Chris
> > >
> > > --
> > > Christopher C. Stratton, stratton@m...
> > > Instrument Maker, Horn Player & Engineer
> > > 22 Adrian Street, Somerville, MA 02143
> > > http://www.mdc.net/~stratton
> > > NEW PHONE NUMBER: (617) 628-1062 home, 253-2606 MIT
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> 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@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>