Re: AP900 Dec backlash - more help required
Thanks to the guidance here, I've removed the motor box cover and
inspected the gear train underneath.
I've discovered that when driving the Dec motor at 1x sidereal speed,
it 'jumps', once or twice per revolution.
This seems to predominantly happen after changing direction - if I
keep running in the same direction the jumps seem to stop after a few
I'm guessing this is indeed due to a loose locking screw on one of the
I put a pencil mark on the end of the motor shaft and after a few
jumps it still seemed to be in the same orientation wrt to the locking
grub screw, so I'm assuming it's not that one.
I can't get to the locking screw on the motor shaft through this side
cover to check it's tightness and can't even see the locking screws on
the other gear shafts.
Am I on the right lines - and are there any guidelines on how best to
adjust the locking screws on these other hard-to-reach gear shafts?
I'm not a mechanical whizz, but I'm reasonably competent.
--- In ap-gto@..., chris1011@... wrote:
it will not package it correctly, and the result is that stress isput on the
motor box/worm gear. This then results in poor worm mesh, so thefirst thing
a new user must do when he/she recaives a used mount is to do are-mesh on
both axes. Probably the biggest mistake is to take such a mount outof the box,
set it up outside and expect it to work perfectly. It probably willnot work
quite right until the gear mesh has been checked. Also, many times amount can
have other minor things out of adjustment which the previous ownernever
realized, but which the new owner will see right away. Therefore donot hesitate to
check all things in the daylight before trying it out in the dark.cover.The motor box cover is located on the opposite end of the worm shaft
Remove the 6 small Allen head screws and the cover will slip off.You will then
see the spur reduction gears. Once you see them, you will understandhow it