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

The transistors you will be looking for here are power transistors, not
the little plastic cased 3 leg switching type you mention. These will be
in a metal case that has a roughly 3/4" diameter X 1/10" high metal
button that sits on top of a base plate that has 2 mounting lugs with
screw holes. There will be 2 leads soldered to the board they are
mounted on and the case is the third connection.

Tim
[Denver, CO]

> -----Original Message-----
> From: audiomaker2000 [mailto:audiomaker@...]
> Sent: Saturday, April 06, 2002 9:27 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] 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:
> > > FAQ: http://www.ktmarketing.com/faq.html
> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > >
> > > OFF Topic POSTS: General Machining
> > > If you wish to post on unlimited OT subjects goto:
> > aol://5863:126/rec.crafts.metalworking or go thru Google.com to
> reach it if
> > you have trouble.
> > > http://www.metalworking.com/news_servers.html
> > >
> > > http://groups.yahoo.com/group/jobshophomeshop I consider this
> as a
> > sister site to the CCED group, as many of the same memembers are
> there, for
> > OT subjects, that are not allowed on the CCED list.
> > >
> > >
> > >
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> > > bill,
> > > List Mom
> > > List Owner
> > >
> > >
> > >
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>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>

http://groups.yahoo.com/group/jobshophomeshop I consider this as a
sister site to the CCED group, as many of the same memembers are there,
for OT subjects, that are not allowed on the CCED list.



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