Thank you for all the suggestion. The following describes what I have found
and done. I did more testing last night and found that slewing in some
areas the RA motor was so slow that I would not be able to start slew again
once stopped. At that time, a saw the current almost went to the maximum.
I can help to restart it again by manually pushing the telescope arm a bit.
Since I know a stall motor can be burn out easily, I decided to open up the
scope and check what's wrong.

I checked for how much play there was for the RA motor mount to compensate
for the uneven RA gear and found that there was actually NONE !. The set
screw beside the RA compression spring was pushing directly on the worm gear
mount allowing no play between the worm gear and wheel. I decided to loosen
adjust the RA motor mount for 1/16" spacing between it and the set screw. I
remount the scope and found that there is no more uneven RA slew speed.

Problem resolved.

Raymond
-------------------------------------------------------
>
> Date: Fri, 29 Jun 2001 11:37:30 -0400
> Subject: Re: [M]: LX 200 RA motor : uneven slew speed
>
> I know the DEC worm is spring mounted to the wheel, but not sure that the
> RA is. Last time I had the bottom plate off, it appeared to be fixed
> relative to the worm wheel. A check of Doc G's site would answer the
> question.
>
> At 10:34 AM 6/29/01 -0400, you wrote:
> >I don't have any personal experience in this area, however I thought that
> >some of our MAPUG experts would have suggested backing up the worm a
little
> >(by tweaking the compression spring) so that the worm would not "hug"
the
> >gear to tightly. Any thoughts on this solution?
> >
> >Regards,
> >Paul Markov
> >Toronto, Canada
> >10-inch LX200 f10
> >
> >----- Original Message -----
> >Sent: Friday, June 29, 2001 9:43 AM
> >Subject: Re: [M]: LX 200 RA motor : uneven slew speed
> >
> >
> >>
> >> Raymond,
> >>
> >> I'll echo Maarten's comments. The centering of the worm wheel is never
> >> going to be perfect and with my scope there is an area that seems to
take
> >> more current and that slows the slew a bit.
> >>
> >> What I have done though is to find that area that slows the slew and
make
> >> sure its always away from the worm. By listening to the sound of the
> >> motors, I slew in RA until I get to the slow area, then stop. I then
slew
> >> 180 degrees in either direction and power off the scope. Then I loosen
> >the
> >> RA and DEC clutches, put the scope in home position (pointed at the
> >> horizon, and aligned with the control pannel or 0 HA).
> >>
> >> Now, when I set up my scope, before power up I always orient the scope
to
> >> the home position. Before I turn off the scope after observing, I SLEW
> >the
> >> scope to the home position before powering off.
> >>
> >> This keeps the tight spot away from the worm, and slewing smooth and
easy.
> >> Its also a good idea to set the slew speed to a slower setting.
> >>
> >> Happy trails...
> >>
> >>
> >> At 11:31 PM 6/28/01 -0400, you wrote:
> >> >>>>
> >> I have a new 10" f/10 LX200 for a about a year now. I have noticed
that
> >my
> >> scope's RA slew speed is not constant. In Alt-z mode, under high speed
> >> slew, I have found that the RA motor is struggling to move when reached
to
> >> a certain location for a spread of 10 degree. At that location, I saw
the
> >> current drain changes from 4 to 6 LED bars in the LX200 panel and the
> >motor
> >> sound a lot slower. Past that spot, the RA motor will speed up again.
> >> Initially, I thought the problem is that the scope is not well balanced
> >but
> >> the problem occur even I get the scope to point straight down to the
> >> ground. I have replace the scope's motherboard myself when it was
brand
> >> new due the scope's computer was DOA but I didn't touch or replace the
RA
> >> and DEC motors. From the meade repair instructions, there is a spring
that
> >> hold the RA motor tight to the RA worm wheel. A 1/8" space clearance
must
> >> be reserve for the worm wheel high and low spot. Could the problem be
> >> that the RA motor/worm gear is mounted too tight to the worm wheel ?
> >Does
> >> anyone have notice similar experience with their scope ?
> >>
> >> Any suggestion is greatly welcome.
> >>
> >> <<<<
> >>
> >>
> >> ------------------------------------------------
> >> ------------------------------------------------
> >>
> >
> >
> >
> >
> - ------------------------------------------------
> - ------------------------------------------------
>
> ------------------------------

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