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.
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.
From: Peter Santangeli <peter@...
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?