Re: [CAD_CAM_EDM_DRO] Re: Stepper sings, but wont walk....

No Sean:

Marris means one of the transistors driving one of the phases. This
assumes a 4 phase unipolar configuration where each phase has its own drive
transistor. If one is short, you get a whine, but just choppy vibrating from
the motor.

Art
Master5 Software
http://users.andara.com/~fenerty/master.htm

----- Original Message -----
From: "audiomaker2000" <audiomaker@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, April 06, 2002 9:54 PM
Subject: [CAD_CAM_EDM_DRO] Re: Stepper sings, but wont walk....


> Thanks all,
> I'll check the voltage from the transformer, I'll check the wiring
> integrity...but Mariss, what is a phase transistor? Is that the
> rectifier?
>
> Thanks
> Sean
>
> --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
> > Hi,
> >
> > Try running the motor at a very low speed, just a couple of steps
> a
> > second. If the motor takes 3 steps forward and a big step back,
> you
> > have a blown phase transistor. You can identify it it with an
> > ohmmeter. Measure the rasistance collector to emitter. A bad one
> will
> > show up as a near-dead short. Replace it and it may fly.
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., "audiomaker2000" <audiomaker@s...>
> wrote:
> > > Hey all,
> > > I have been trying to repair a Bridgeport Boss that has a
> stepper
> > > which when told to move via the stock control "sings" and will
> sort
> > > of vibrate but wont actually turn. I've replaced every card in
> the
> > > machine with those which I pulled from my retrofit machine (and
> > > which are known to work), and the result is the same. I checked
> > the
> > > motor itself by switching it to a different axis circuit and the
> > > stepper works fine.
> > > So, I'm wondering what else besides the cards (drives, and stock
> > > CNC) that could cause such a condition? I'll probably just
> > retrofit
> > > this one too, but it is making me quite curious. All that seems
> to
> > > be left is cap's and wires.
> > >
> > > Thanks
> > >
> > > Sean
>
>
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