I have a periodic error of ~2 arcmin during in ~1 minute. The stated full cycle of the worm gear is about 12 min. I'm about to start using the PEC function, but I still have hopes to reduce it without computer help.
It appeared when I opened my LXD75 mount to reduce the backlash, adjusting the three screws on the worm gear box. I only turned them less tha 1/4th of turn and checked it wasn't too tight to turn the RA axis, so I hope I didn't damage the worm gear. In fact, I don't even know whether this have to do with the worm gear, as this periodic error has a much smaller cycle. Could it be in the interface between the motor box and the mount gears?
I followed others' instructions to correct the backlash and I was very successfull, but I still don't know what is happening inside the box. For example, why do I have to loosen the middle screw when I tighten the right and left ones?
Do you have any advice?
Thanks in advance.