Re: [CAD_CAM_EDM_DRO] which steppers to buy?

www.herbach.com has some big ones of these 1125 oz in I think.
I thought about buying one to make a 'smart' power feed that would
cycle between two programmed points. Decided the electronics to drive them
would be a bit tricky, still I might go for it.

Chris

> John:
>
> I know some folks think they go too slow, but if you rewire a slo-syn
> 72hz AC/Syncronous motor that you can pick up for $29.00 at a few places,
> you get tremendous strength from them. I don't know the OZ/Inch spec, but my
> gantry (about 250lbs) can be driven by one of these things at 4inches/second
> at a low gear ratio. If you don't care about speed, it's a good cheap
> alternative. I feed mine at 50VDC at 2.5Amps and you can't stop the gantry
> at 3:1 ratio, it will crush your hand. Re-wiring the motor is trivial and
> you can get about two rev's per second from them or 120RPM. Not fast for a
> stepper, but with their strength, you don't have to gear down as much.
> Just do a web search for SLO-SYN AC SYNCRONOUS motor. They general sell
> surplus for about $29.00 or less, weigh about 5lbs each or more, and under
> the cover, you can just make about 10 cuts on a PC board, solder 4 wires to
> the PC Board,and solder a few jumpers on the same board and voila, you have
> a cheap strongman motor that I'll bet can turn just about any control
> without gearing it at all if you don't need tight resolution. Let me know if
> you want the wirng details. It takes me about 30 minutes per motor to rewire
> them, and so far we've done 6 of them and are too happy with the results.
>
> Art
> ----- Original Message -----
> From: "Alan Marconett KM6VV" <KM6VV@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, May 28, 2001 1:52 PM
> Subject: Re: [CAD_CAM_EDM_DRO] which steppers to buy?
>
>
> > Hi John,
> >
> > I understand what you are saying! I'd expect that you'd need something
> > like 300-400 oz/in (from what I've heard for mill/drills, and 3 in 1's,
> > but hay, If the motor mount fits, try it! I plan to try some old NEMA
> > #34 S/S 300 oz/in motors on my new RF-31 mill, with 3:1 drives, even
> > though their not really big enough! I will put on bigger steppers when
> > I can afford them! For now, I'll even leave the Acme lead screws!
> >
> > Alan KM6VV
> >
> > marble here wrote:
> > >
> > > Ok Group every one is saying to use at least a 200oz
> > > stepper .I called Smithy and asked then what they
> > > would suggest stepper s for the 17X20 3 in 1 they sell
> > > I was told that a 150 oz stepper and a 3:1 timing gear
> > > now I am confused is this rating they say too small I
> > > do have these stepper s now. I thought I should give
> > > them a try just for the heck of it . Am I looking for
> > > trouble using a small stepper I know that I can not
> > > get any real speed out of them , but going slow I
> > > think may be go till I learn more.
> > >
> > > John
> >
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> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
22 Adrian Street, Somerville, MA 02143
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NEW PHONE NUMBER: (617) 628-1062 home, 253-2606 MIT