meanwhile I worked on the balance of the tube. (20 Inch Newton on a DDM85 standard - weight ~42 kg)
I checked it with the inbuild balance tool of autoslew.
Telescope pointing to the south and I worked on the RA-axis to bring it into balance - balance tool shows bars close together at less than 1 A current. So I assume it's ok.
Now I focus in the DK-axis. My latitude is about 50 degree, so if I look on the DK coordinate - it runs from zenit to the horizon from +50 (zenit) to -40.
I started a zenit first bring the telescope into the balance putting some weights north / south on the extend tube at the level of the DK axis. - So this weight positions should have no impact the balance in horizontal position. Balance Tool indicates bars close together @ 1.0 A current level.
I moved the telesope down do DK = -30 degree (check limits is disabled) and turn the telescope in the balance here also. Balance Tool shows same balance level..
After that I move step by step and check out balance at several DK's.
Essentially I found out, that there are small areas where the movement in DK works and other in between there it does not (position error in DK). For what ever reason the range of possible movement is close to 6 degree and the inbetween regions with position error is 10 degree..
+54.0 to +47.5 degree movement ok - in balance with less when 1.0 Ampere (shown in the Balance Tool)
+47.5 to +38.0 does not work -> position error
+38.0 to +31.4 movement ok - in balance with less when 1.0 Ampere (shown in the Balance Tool)
+31.4 to +21.4 does not work -> position error
+21.4 to +15.5 movement ok - in balance with less when 1.0 Ampere (shown in the Balance Tool)
+15.5 to +05.0 does not move -> position error
+05.0 to -00.7 movement ok - in balance about 1.0 Ampere (shown in the Balance Tool)
-00.7 to -10.8 does not move -> position error
-10.8 to -16.8 movement ok - in balance about 1.0 Ampere (shown in the Balance Tool)
-16.8 to -27.3 does not move -> position error
-27.3 to -33.1 movement ok - in balance about 1.0 Ampere (shown in the Balance Tool)
I understand that balance is a important topic - but I don't understand why the telescope is in balance at DK = 50 and ~25 degree not but at 2 degree again without changing any weight.
On top: if I move manually the telescope in a region of position error and rerun the Autostart Testing for the DK axis, it work for a few degree.. - very strange
In addition: if I move the telescope by RA, I see small changing of DK((!) even in case I do not push the DK button..(~1 arc sec / sec) - for me unexpected.
Any Idea / comment ?