RE: [CAD_CAM_EDM_DRO] Re: Yet another NEMA 42 roadblock

I looked at the archives and realized that I may have a Sigma (rather than a
Superior Electric) NEMA 42 stepper. (Someone told me that if the screws are
in two lines, like mine, rather than in a circle then its likely to be a
Sigma). Sigma's were apparently used by Bridgeport as well during the time
my machine was made. As my motors are unmarked, this could account for the
difference in terminal nomenclature. I've been unsucessful in finding any
information about their motors on the web. Do you know where I can get this
type of data? (I'm reasonably comfortable that I'm at lest in the ballpark
on my voltage and current assumptions (2.1 volts and 8.5-9 amps based on the
motor's resistance of about .28 ohms and a number of spec sheets from
various manufacturers), but I'd like to do a sanity check on the windings
before I destroy a motor because of my own stupidity.

Any help would be appreciated.

Regards,
Jeff

-----Original Message-----
From: turbulatordude <davemucha@...> [mailto:davemucha@...]
Sent: Wednesday, February 19, 2003 11:36 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Yet another NEMA 42 roadblock

Hi Jeff,

go for half winding. leave 2 coils un-used. make sure the ends are
isolated from each other, no two wires touching, wire nuts and tape.

If it don't spin, switch a pair for a pair.

once you see it spin, you'll see how simple it is.

Search the list for 8 wire steppers, do it with google as described
in the files section, if you feel like you want more data.

Dave





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp <jeff@w...>"
<jeff@w...> wrote:

> I'm still fighting the battle of my unmarked NEMA 42's
>
> I was all set to hook them up and I got a connection diagram from
> Superior Electric on their 8 connection stepper motors to make sure

I

> got the polarity of the windings right. They show windings from
> terminals 1-6, 2-3, 4-8 and 5-7
>
> I have continuity between:
>
> 1-6, 2-8, 4-7, 3-5
>
> I know that proper polarity is important and specific windings are
> important, but don't know how to proceed from here to identify the
> terminals without opening the stepper (which I understand is a no-

no).

>
> Please help.
>
> Clueless in Brooklyn
> Jeff

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