Re: Stepper sings, but wont walk....

Sean in a nutshell (or house..depending).

Electrical: Ok
Concept: Excellent
Mechanical: VG
Humor: Superior
Electronic: ?....?....? (did I mention "?")

:-)

To me, a transistor is a tiny little back cylinder with 3 little
wires coming from it, which if surrounded by a brown film on the PCB
means my guitar amp wont work and I will have to spend 2 hours
finding out the Radio Shack guy knows even less. I think these are
used to start and stop, and maybe even control voltage

A capacitor is either a big blue cylinder or a little mentos wafer
looking thing with 2 leads and acts as a battery or buffer to smooth
out voltage. Big ones can carry a nice suprise.

A resistor looks like a big grain of rice with colored bands on it
which will stump the Radio shack guy for hours...epecially when
coated with a brown film. These reduce voltage as far as I know.


Ok, based on that, most of the transistors, capacitors, and
resistors are located on the cards that I swapped out. There are
also the big blue capacitors in the supply line and some really
pretty Mr T looking resistors which are hard to tell if they are pre-
or post drive card.

So am I looking for a little black cylinder with 3 wires that isn't
on a card?
The only other electronic "thingies" in the system I didn't mention
are 3 big coil/transformer looking deals called "axis reactors" by
the manual and a scattered amount of something that looks like a
relay with a clear plastic cover.

I guess it's obvious that I didn't stay at the electronics Holiday
Inn last night :-( I do have a good VOM though.

Sean (feeling pathetic)

--- In CAD_CAM_EDM_DRO@y..., "art" <fenerty@h...> wrote:
> 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@s...>
> To: <CAD_CAM_EDM_DRO@y...>
> 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
> >
> >
> > Addresses:
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> >
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reach it if
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> >
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as a
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there, for
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> >
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