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Dear Brian, Given the changes of daylight savings time starting date over the years, it's easy to get the hour off by 1 hour...at least that's my theory. The solution is this: only enter the UTC time,

Hi all, great forum. I’m not sure if what I’m experiencing is normal, hence the post. I have a new G11G/Gemini 2. PA to start is decent but not perfect, probably within a dozen arc minutes of

Andre, Most people who do a mount rebuild usually replace the bearings at the same time. They are inexpensive and therefore disposable. If you just ordered new ones from Losmandy, you should be OK.

The largest component of my PE is 480s, which is exactly the worm rotation period, so it must be something with the worm. Before doing lapping with diamond paste, I think I will start with natural

Alexander, I'm hard pressed to see the larger periodic error being ?associated with the worm. You might be looking in the wrong place. May I suggest you change the the thrust beings. I would

Makes sense, will check it out.

I am thinking of doing worm lapping. I see some people had great success using 1-micron diamond paste from mcmaster. What is the latest wisdom on this subject?

Hi Andre - If your mount originally came with stainless worms, from what I understand it should be a marked improvement. In my opinion, you ideally want to reduce PE on the RA axis since that will

Hello Tony, The original mount came with stainless worms. I have purchased one OPW and two High Precision worms for both RA/DEC. I was considering the OPW for the RA axis but will think about using it

Hi Andre - Did your original mount come with the HP brass worms?? Or were they stainless?? ?Assuming they were HP brass already, the new OPW might not offer much less PE than your original ones,

Hi, My mount had the original steel worm and 492 driver that I recently replaced with onstep with 400 steps motor and using 128 microsteps for tracking. Here is a video of the g11 mount with onstep:

Alex, Glad you made some improvements. That is still quite a bit of periodic error, and 0.8" guiding for a scope of that FL is sort of marginal. You of course want to get to a point where RA and Dec

What I mean is that it is out of round, due to the set screw mounting, or some other reason.? You should check it with an indicator like John suggested.

Hi Andre, Please can you be more specific on the mount you have? Based upon the age I assume this is with the non-tucked motors and a Gemini 1. I have the tucked motors and a Gemini 2, so mine might

Hi John, I heard about the gauge method and even did some testing. Of course, my worm ring is slightly off round. I will try to find some info about the worms on this forum, I did not see it before. I

Alex, You may benefit by using a run out gauge on your rotating parts. Basically this is a fixed needle point which rides right along the spinning surface and will tell you how far out of round you

Hi I have just acquired the OPW amd there exists a hole. Does anyone have purchased it recently? Is it for a spring mechanism? Thanks

Guilherme, Could you please share your guide log with guiding disabled or graphs, similar to what I posted? What kind of worm do you have - is it brass or steel? Alex

Hello all! I live in Brazil and I have a G11 for about 10 years and I never could get really good tracking. I finally purchased the OPW (after a long wait) for the RA axis and the new "high precision"

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