Hi guys,
This is my first post on this group. Sorry for my english, I¡¯m not a native speaker.
I have an old GM8 mount which I want to improve. The actual periodic error is about 54 arc/sec peak to peak. I have the steel worms and two block design. I¡¯ve attached a picture with PECPrep graphs.
My questions are:
1) Can I improve the actual error using the steel worm?
2) If I change to a high precision worm from Losmandy what would be the best PE I can get? How much better than now? To know what to expect.
3) Can I find the mount¡¯s year of production by viewing the serial number? The serial number is HGM299805084.
What I want to do next to gain some improvements:
1) Change the bearings with new ABEC 5 bearings.
2) Spring washer on one bearing to tension the worm between the blocks.
3) Play with the mesh to find the hot spot.
What I did till now:
1) Clean and grease the mount.
2) I found that at transport the blocks that press the needle bearing and hold the RA axis were misaligned. So I pressed them together to a true. I¡¯ve read about this here on the group.
3) Make a version of OPW. You can see it in the attached picture.
I¡¯ve searched a lot on internet about performances of GM8 but very few details I found. So you are my last chance J
Any suggestions are welcome.
Catalin
