I had a problem with severe drift in DEC for my Altas EQ-G mount.
I did a tear down and rebuild for both DEC & RA axis.
The DEC now works perfectly. But RA, which was working well before the "operation" is not working well.
I have tried several adjustments on the worm-gear drive (following the usual procedure). As far as I can tell, it's a hit and miss deal because you cannot see the worm gear meshing with the RA axis gear. The only problem is that I can't seem to "hit" the sweet spot for this worm gear. Is there any secret to this thing?
In case it helps, you may want to look at my most recent attempt at guiding. I attach my PHD2 guidelog.
PHD2_GuideLog_2019-03-19_044025.txt 72.42KB 8 downloads
You can see in the 3rd log (the one for 25 minutes) that there is definitely something periodic going on in the RA axis that messes up the guiding.