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1100GTO, slight free play in RA axis only. Is a backstop adjustment needed?
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Roland Christen
If it's good, don't fix what works.
 Rolando
-----Original Message-----
From: skester@... To: main@ap-gto.groups.io Sent: Mon, Aug 2, 2021 3:33 pm Subject: Re: [ap-gto] 1100GTO, slight free play in RA axis only. Is a backstop adjustment needed? Roland,
Last night I adjusted the back stop using the lightest pressure I could, barely touching the backstop with one finger, and gently tightening the two screws. After doing this, all the free play in the RA axis was gone. I then did a few slow (12x) test slews and then a couple of 600x slews and all seemed fine. After reading your reply today I loosened the RA backstop screws again and with only gravity holding the backstop down and no finger pressure at all tightened them. The free play in RA is still gone. Do I still need to contact George, or should the mount be good to go? Thanks, Scott -- Roland Christen Astro-Physics |
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skester@...
Roland,
Last night I adjusted the back stop using the lightest pressure I could, barely touching the backstop with one finger, and gently tightening the two screws. After doing this, all the free play in the RA axis was gone. I then did a few slow (12x) test slews and then a couple of 600x slews and all seemed fine. After reading your reply today I loosened the RA backstop screws again and with only gravity holding the backstop down and no finger pressure at all tightened them. The free play in RA is still gone. Do I still need to contact George, or should the mount be good to go? Thanks, Scott |
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Roland Christen
The backstop won't adjust the free play. DON'T jam the back stop hard into position!
What does affect the free play is the retaining nut on the end of the worm. If this is loose or has backed off slightly, it will allow the worm to move back and forth. Call George at AP and he will assist you.
Rolando
-----Original Message-----
From: skester@... To: main@ap-gto.groups.io Sent: Sun, Aug 1, 2021 12:36 pm Subject: [ap-gto] 1100GTO, slight free play in RA axis only. Is a backstop adjustment needed? I've had my 1100 for a few months and it has performed well. However I noticed from day 1 a small amount of free movement in the RA axis while the Dec axis has none. The amount of play in the RA axis is between 1 and 2 mm of movement at the tip of the counterweight shaft.
Is this amount of play normal/correct, or should I adjust the RA gearbox backstop as described on page 34 fo the owners manual? Thanks, Scott -- Roland Christen Astro-Physics |
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skester@...
I've had my 1100 for a few months and it has performed well. However I noticed from day 1 a small amount of free movement in the RA axis while the Dec axis has none. The amount of play in the RA axis is between 1 and 2 mm of movement at the tip of the counterweight shaft.
Is this amount of play normal/correct, or should I adjust the RA gearbox backstop as described on page 34 fo the owners manual? Thanks, Scott |
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