Re: Poor guiding with GM8
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I use direct drive with my GM8, see in the showcase page. It works just fine with a 400 steps NEMA17 motor, with slews up to 3.5 degrees/s. I also use a spiral coupler instead of the oldham model that came with it.?
The problem with PE is still bad in my case though. I believe it has more to do with the old worm. I recently acquired an OPW with a new high precision worm for the GM8, and will compare the PE before/after.
Guilherme
On Wed, Jul 28, 2021 at 5:09 PM Alexander Varakin < avarakin@...> wrote: Pete,
I also have G11 and I am using Onstep with the direct drive there too.
Unfortunately, GM8 has only 180 teeth on the ring gear vs 360 for G11, so I believe that doing a direct drive for GM8 would be pushing it.
In any case, I did try direct drive and I still saw bad PE.
Let us know how your mod goes, I was wondering about using the Oldham too. I am currently using the spiral coupler, I believe that most folks do this as well.
Alan,
I will check it, but I think it is optical illusion.
John,
Good point, I will try to loosen up the belt a little.
Michael,
Good point too. Is there an article somewhere, describing how to align worm against the ring?
I am reading this forum on a regular basis and did not see a discussion on this subject.
All,
How consistent is the quality of the brass worms? Does it make sense to get a new one?
I guess I can try to pull one from my G11...
Alex
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