Hello Brian:
Thank You for the input I will have some time after the weekend and will
give it a try
Abe

At 02:24 PM 4/12/2000 -0500, you wrote:


>Setting the mount to Alt/Az and going for it? I would actually NOT expect to
>see any problem with the relationship of RA axis to DEC axis as they are well
>fixed by the mechanics of the mount (unlike the fork arms which have play).
>However the OTA Line of Sight to mount relationship could be variable.
>Actually if the OTA saddle has no play for adjustment you're out of luck
>anyway
>as there is no means of making an adjustment. So check that first and maybe
>none of this is possible anyway. :-))
>
>Shortcut would be to skip to the last step. Ah I visualize the problem -
>a fork
>mount allows free rotation about the RA axes as the OTA LOS can be made
>coincident with the axis of the RA and a GEM does not! <sigh> Oh well it was
>worth a bit of thought anyway :-))
>
>Perhaps try this - (might not be worth the trouble). Put the mount into
>Alt/AZ
>position. Strap a laser pointer on the OTA and mark where the laser
>projects a
>line from swinging in Alt. Bisect the line and make a mark. Align the
>laser on
>this mark and swing the OTA is Az. The lines should be
>perpendicular. Position
>the OTA so the laser is on the center mark and lock the Alt/DEC
>axis. Swing the
>OTA in Az/RA approximately 90 degrees to one side. From a distance
>project the
>laser onto the front of the corrector plate so that the reflected beam is
>on the
>horizontal line drawn previous. Mark the location of the spot (actually
>one of
>two spots as there will be a reflection from both surfaces of the corrector
>plate. Pick one). Swing the OTA 90 degrees in RA, and moving the laser as
>little as possible (except in the horizontal plane) position the
>reflection back
>onto the horizontal line. I would assume that the distance from the
>middle mark
>to each of these two spots should be the same if the OTA LOS is aligned
>with the
>mount. I would think - but don't have a GEM to see if this is actually
>the case
>or not.
>
>regards, Brian
>
>
>
>
>
>
>
>cc:
>
>Subject: Re: [M]: LXD 750 Mount
>
>
>
>Hello:
>I have seen some information on how this would be done with a fork mount
>but I'm not quite sure how I would do it with the German Equatorial. It
>would be like tying to do the same procedure while the forks are on a wedge
>and tripod. Do you have any suggestions?
>Thanks
>Abe
>
>At 09:44 AM 4/12/2000 -0500, you wrote:
>
>
> >Are you sure that the OTA Line of sight is aligned with the mount axis of
> >rotation? See www.mapug.com where there is a procedure for Mount/OTA
> >alignment
> >for fork mounts.
> >
> >
> >
> >
> >
> >
> >
> >cc:
> >
> >Subject: [M]: LXD 750 Mount
> >
> >
> >
> >Hello All:
> >I am new to the MAPUG and have an LXD 750 Meade German Equatorial mount
> >with a 14" optical tube on it. The drive electronics are the same as that
> >of an LX 200. Does anyone have any experience with replacement of the
> >motors? Where could I get a motor replacement of the same approximate
> >physical size but with more precision and torque? Has anyone attempted a
> >replacement of the internal gears in the gearboxes with brass gears? I find
> >the pointing accuracy of mine is not very good. It may be attributed to
> >excess weight of the optical tube and counterweights.
> >Thanks and any help or comments would be appreciated
> >
> >Abe
> >
> >P.S. I posted with the wrong thread before.
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>

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