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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

Alan,? By "main", are you referring to the pulley on the worm?? Given the 480 second PE this seems likely. If so, Alexander should check that this pulley is firmly located and tight on the shaft.?

Your main pulley is off-center, which gives a 480 s periodic error.

The full gory details of how the position counter value is determined are in Microchip document 70208C.pdf (“Quadrature Encoder Interface”):

Alex, Quite an interesting pic showing your design. If there was ever an arrangement that should remove all gear slop from the stock mounts I would think it would look just like this. Since your

Alex, That's a very nice system. But it is so different from anything "stock" that I'm at a complete loss to advise you. Your system drive seems sensible, and as the oscillations are at the worm

Hi Michael, Many thanks for the detailed reply. Here is my mechanical setup - I have the reverse worm setup with time gear attached directly to the shaft of the worm. The larger gear is 60 and the

Allan, The Ra encoder upgrade was a bust I feel. I would not bother. While testing was limited, I did not see a significant improvement. I think it's because you are either slowing down or speeding up

Paul, I appreciate that, but it's kind of irrelevant, and confuses most people into thinking you are controlling the motor at that resolution. Frankly, I can not recommend enough that Losmandy owners

Peter, Entirely possible and even likely. I'm not arguing with your results. All I was trying to do was to correct some information that was posted earlier on the encoder precision. Gemini PIC

Paul, This is where people are getting confused I think.? The positioning step accuracy is 0.5625". Therefore if you what to make a Dec correction it will be that large. You can not move the motor a

This is a single step addressable by the Gemini controller. The actual accuracy of the encoder reading is 4x the step or 0.1406" and even smaller for Titan. Regards, -Paul

Alex, Your frequency chart shows the 480 sec GM8 worm period is the biggest frequency, and the 240 sec period (occuring twice per worm period) is the second highest peak. Your tracking chart shows a

Peter:? since you're doing a deep dive, might be interesting to check the orthogonality of the axis shafts to their top plate. I had an issue in mine leading to some stiff spots when rotating the

> > Do you have plans to upgrade the optical encoder to 1024. I think you will > see a very noticeable benefit. It's a $65 investment and you do not have > to remove anything from the drive other than

I was able to run further tests last night, but smoke moving into our area cut the session short. I put back the 25:1 McLennan gearbox on the Ra drive and ran a guiding test with the 256 tick optical

Michael, Mark Crossley identifies the issues I"m seeing quite accurately. I think I'll go back to the thinner thrust bearing to reduce the significant exposure of the needle bearing assemblycaused by

Just thinking out loud here, Michael, but I am wondering if the fresh application of the lubricant grease during a rebuild is not contributing a small amount to the separation of parts. When the lube

Thanks for the tip Michael. I will certainly check out Mark's site.? There is a copper wavy spring under the PS flange. With the thicker thrust bearing there is now enough space for the polar scope

The vibration settle down from moving the axis may be coming from a different place than when you touch the focus. Perhaps there's some oscillation in the axis that might be reduced with a bit of