Re: Dec Drive, etc.

[Chris Albertson <chris@216-178-250-236.lax1.phoenixdsl.net>]

I wonder if an encoder would help?  They make inexpensive
3600 step (1/10th degree) encoders that be directly attached to the
DEC axis.  It might be easier to move the Dec motor while
watching the encoder then to move it open loop.  With an encoder
we have the option to try again if we miss or back up if we
over shoot.


aah@nofs.navy.mil wrote:
> 
> Well, those are not all of the problems of course.
>   The Dec drive has considerable slop and even if
> power remains on, you can move the telescopes several
> degrees by hand before you feel the stepper.
> So if you want accurate positioning, even the
> changes you mention are not sufficient.

-- 
   Chris Albertson             home: chrisja@phoenixdsl.com
   Redondo Beach, California   work: calbertson@primeadvantage.com