Michael J. Cook wrote:

> I have had the same problem with my 12" - the teeth were not fully meshing and
> this introduced slop about the RA axis. My interim solution was to stretch the
> spring located on pivot. This seemed to engage the teeth a little better. What
> about using a spring with a little more compression to it. Would this harm the
> "system" in any way?
>
> Mike
>
> Richmann, Michael wrote:
>
> > I've run into a problem in the past which can give rise to the "slop" in the
> > RA drive problem you mentioned below. I was seeing jittering in my
> > guidestar images and finally tracked it to the RA drive. Pulling the
> > baseplate off and examining the RA drive revealed that the spring-loaded
> > pivot which keeps the motor drive gear firmly engaged to the gear on the
> > fork mount was sticking and thereby keeping the teeth from meshing
> > completely.

These discussions sound very much like those for the declination drive. it is no
wonder since the two drives are identical but for the index magnet. The dec drive
even has the hole for the magnet and the same circuit board but without some
components.

In any case, I think the same mechanical arguments apply and thus suggest you might
want to study the declination drive fixes and adjustments for ideas about how to do
the same for the RA drive. The discussions are in detail on my web site.

Doc G <http://www.mailbag.com/users/ragreiner>

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