Re: Yet another NEMA 42 roadblock

Jeff, listen to Tim and Dave!!!!! Hook up to any 2 of the coils you've
found by the continuity tests and go for it. Label each wire and make
a table of results. You are not going to hurt that big stepper
(unless your drive is blown). Play with all combinations of the coils
(if you are trying to go full coil). They will either work or sit
there humming. I wasted too much time being over cautious my self. I
could see the need for caution if these were delicate small motors
and you had a 7amp drive.

Those bridgeport stepper motors could take pulse up to 160vdc and
about 7amps with the orig BP drives. The 160vdc got the motor coil
quickly up to current, then the supply backed off to about 12vdc to
maintain the current. Increased slew-rate.

-Lee

> 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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