Re: [APML] Drift alignment problem - wedge mounted scope

[steve banbury <banburys@sonic.net>]

Hi Bradley---this is a fun exercise!
Probably less fun for you since it impedes your imaging.
But I'm sure I can learn something from this when its resolved!

steve

Bradley wrote:

>Gene;
>
>Yes, the Dec worm is spring loaded, just like the RA. This could be a
>possible cause if the Dec axis had something loose in it...but I already
>checked that and wasn't able to detect any untoward movement, I'll recheck
>just to be sure as well as making sure all the setscrews etc are snugged
>well. With nothing loose in the axis, I'm not sure how else the light spring
>pressure could be a possible cause.
>
>Steve;
>
>That could very easily be a cause if one of the lateral legs were at
>fault...but the scope lives on  a permanent pier in an observatory. Sorry, I
>should have stated that in my original post.
>
>Bradley
>
>Thorn Garden Observatory
>http://astronomy.thorngarden.net
>
>----- Original Message ----- 
>From: "Gene Horr" <genehorr@houston.rr.com>
>To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>Sent: Thursday, July 28, 2005 6:21 AM
>Subject: RE: [APML] Drift alignment problem - wedge mounted scope
>
>  
>
>>Strike one <g>.  The next idea would be the worm.  I don't remember
>>    
>>
>whether
>  
>
>>or not the DEC worm is spring loaded like the RA is.  I don't think this
>>is likely but it is possible that the worm spring is slightly moving the
>>OTA.  My test would be to leave it in the position for 30 minutes or so
>>and then test for drift.
>>    
>>
>
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>  
>
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