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Re: [ATM] stepper motor circuit with autoguide for 148 tooth gear??

Good idea - thanks for the reference.  Say, might a router speed control be a frequency adjustment device?  One is described here - the "full torque and power at every speed" makes it sound possible but I am Very Much not an electronics kind of dude.
   
  http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/speedcon.html
   
   
  Gil
   
   
   
   
  George Anderson <tillerman1@videotron.ca> wrote:
  Hi Gil

I personally would go with a 1/10 RPM motor and drive it with the 
"Alcor" driver designed by Michael Covington. You may want to tweak the 
values so that you can bring it right on the money as far as speed. It 
uses a simple PIC microcontroller (16F86 IIRC). I did a similar thing 
with my el-cheapo EQ3-2 mount and had to trim the other way. I needed 
approx 1/11 RPM.
A google search for Covington Innovations will drop you onto Michael 
Covington's web pages.
Or you could try hacking one of the cheap 12V to 115VAC inverters and 
bump the frequency up a tad.

George Anderson
Montreal Canada

Clear skies and good health.
Gil McFarlane wrote:
> I bought a very nice small Pentax GEM mount at the RTMC swapmeet - but it lacks any sort of motorized drive. The RA dear is apparently 148 teeth - puting it at odds with the common 144 tooth mounts (that not-so-incidentily) match up with a 1/10 rev per minute sync. motors. So it seems that (unless OP telescopes can scare up an original drive in Japan for me), I will need to go to a stepper motor. I have some references for stepper motor drives - but none with any autoguiding capability. 
> 
> Now it is true that any Pentax drive motor would not have any autoguide capability, and I would happily live without it, but why make something if it is not just what you want!
> 
> Any suggestions?
> 
> Gil
> 
> 
> 
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