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knock on direction reversal #Guiding
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Peter Santangeli
I've been trying to isolate some issues guiding my C11 on AP900 that look like might be backlash (strangely... in RA).
I just re-seated my RA worm (I did this 5 or so years ago). I just noticed that when I reverse directions at maximum slewing speed, there is a significant sounding 'knock' from the gear box. I don't remember this before, but maybe I'm just paranoid. Should this be quiet or is a noise on reversal ok? pete
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Roland Christen
Guiding and slewing are two different things. When
slewing back and forth, the RA motor does reverse direction. But that
has zero to do with guiding.
When
guiding, the RA motor simply slows down or speeds up slightly, which in
turn causes the guide star to move either forward or backward on the
crosshair. Guiding never reverses the RA motor. Guiding is never done at slew speeds.
Roland
-----Original Message-----
From: Peter Santangeli <peter@...> To: main@ap-gto.groups.io Sent: Tue, Jun 7, 2022 7:42 pm Subject: [ap-gto] knock on direction reversal #Guiding I've been trying to isolate some issues guiding my C11 on AP900 that look like might be backlash (strangely... in RA).
I just re-seated my RA worm (I did this 5 or so years ago). I just noticed that when I reverse directions at maximum slewing speed, there is a significant sounding 'knock' from the gear box. I don't remember this before, but maybe I'm just paranoid. Should this be quiet or is a noise on reversal ok? pete -- Roland Christen Astro-Physics
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Hi Pete I don't have an answer for you on the knock sound, but generally backlash is not an issue when guiding in RA. it's tracking in sidereal, so the axis will slow down or speed up in response to guide commands, but never reverse. If you have a guidelog that may shed more light on your problem? Brian
On Tue, Jun 7, 2022 at 5:42 PM Peter Santangeli <peter@...> wrote: I've been trying to isolate some issues guiding my C11 on AP900 that look like might be backlash (strangely... in RA). --
Brian Brian Valente astro portfolio https://www.brianvalentephotography.com/astrophotography/ portfolio brianvalentephotography.com
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Peter Santangeli
Yup. I get that. I just hit this noise situation after adjusting the worms for backlash. I think I figured it out though. The worm adjustment was too tight. When I loosened it up a bit (by turning the spur with the worm lock slightly loosened) the noise went away. pete
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