Hey Ken, 

Thanks <GRIN> but please let ME know, OFFLIST, if you have concerns about
another members behavior? Thank you.

Now, I did find some documentation on ohming out stepper motors that is a
little more detailed that what I've been providing with the linistepper, but
not much. 

http://www.stepperworld.com under Tutorials / Unipolar. He says "You can use
an ohm-meter to find the center tap - the resistance between the center and
a leg is 1/2 that from leg to leg.  Measuring from one coil to the other
will show an open circuit, since the 2 coils are not connected. "

What is missing is a step by step method of using the above to figure out
the coils. Rather than try to document it, I'm going to try to find the time
to write a little JavaScript program that will collect the information you
find from measuring the coils and use that to show you the circuit.

That is an interesting challenge huh? <GRIN>

---
James.
 
 

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of kenash1
> Sent: 2005 Feb 28, Mon 05:19
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Finding stepper motor wiring
> Importance: Low
> 
> I am the fellow who had some basic questions about stepper 
> motors. Do you have any idea of just how to hook up a vm to a 
> stepper? That would be more appreciated than your lashing out 
> at someone who's just trying to be helpful, wouldn't it?
> 
> Ken Wilson
> 
> ----- Original Message -----
> From: "Olin Lathrop" <olin_piclist@embedinc.com>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Monday, February 28, 2005 7:07 AM
> Subject: Re: [EE] Finding stepper motor wiring
> 
> 
> > James Newtons Massmind wrote:
> >> Err... Did anyone see this? Any comments? Can someone 
> maybe just say
> >> that they got it and why they aren't interested?
> >
> > I got it.  Seems like a long way to go to avoid using an ohmmeter.
> >
> > I was also not sure how much you can feel a shorted winding 
> on a stepper
> > motor, since most have fairly strong detent forces to begin 
> with.  I 
> > didn't
> > have a stepper motor handy to try on, so I kept quiet.  
> Your method also 
> > has
> > the problem of not determining polarity easily.  If you've 
> got 4 pairs, 
> > just
> > tying one from each together will only work for 2 out of 
> the 16 possible
> > combinations.
> >
> > Then there's the question of why is someone messing with 
> stepper motors 
> > that
> > knows so little about electronics that they have a phobia 
> for ohmmeters. 
> > Or
> > at least why would you want to put yourself in the position 
> to support 
> > them.
> > It seems like a no-win situation.  When something doesn't 
> work they'll 
> > blame
> > you.
> >
> > It did make me think a little about how to automate this 
> with a PIC.  Plug
> > in up to 8 wires from a stepper motor and a few seconds 
> later it tells you
> > what's what.  Then I realized this would be a low volume 
> product and the
> > same people that don't want to spen $15 for an ohmmeter 
> aren't going to
> > spend $200 or more for a stepper motor tester when you can 
> buy a new 
> > stepper
> > motor for $20.
> >
> > I've also stopped responding to general requests for help 
> ever since I 
> > found
> > out you were sensoring my posts behind my back and despite 
> your promise 
> > not
> > to back in October.  I now only jump into interesting intellectual
> > discussions or when I otherwise feel like it or have 
> something to gain
> > myself.  I don't want to "support" the PIClist with free 
> help as long as 
> > my
> > posts continue to be subjected to sensorship.
> >
> >
> > *****************************************************************
> > Embed Inc, embedded system specialists in Littleton Massachusetts
> > (978) 742-9014, http://www.embedinc.com
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