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Hi Jim.? Though I don't think this will have much affect on your backlash issues (it didn't for me when I tried), if you want to try, the company who makes the coupling will sell you the nylon

Here’s my understanding. The servo is a simple electric motor which rotates at a speed determined by the controller that feeds it PWM (pulse width modulated) signal. It doesn’t jump from step to

Peter, The Gemini 2 serial commands document says: 27 2000..25600 Number of RA steps for one worm revolution (since is a product of spur ratio and motor encoder ratio,this command can only be used for

It’s an Oldham coupling. ?Usually you replace the lot as grub screws can be worn etc. I believe Losmandy had 2 lengths of these depending on the worm block but not so sure on this. You can use a

I have a question about the plastic part that joins the two metal parts.? The plastic part has 2 cylindrical cutouts that are 90 degrees apart.? The mating metal coupler parts slide into these two

Hi Alan EDIT: woop, my bad i got confused here that you jumped in on the OP's comments Actually the controller is not the issue, The Gemini 2 works extremely well and in many ways far surpasses

Alan, Some good points there. But the answer is in the software, not the hardware. When I reported the wild slews in the forum in 2018, Rene Gorlich, the software engineer in Europe wrote the Beta

Anthony, The interval is probably up to you, but if you are operating well why bother? It all depends on how often you use the mount and where it is stored. My G11G is in the observatory year round so

I took a look at the PEC file and ran a quick test to see if a curve with 3200 steps is possible and it seems to be so. The PEC process is very simple. I only changed out one gearbox, I wonder if PEC

GuitsBoy, would you share the STL file when you are satisfied with it. I have been working on a modified version of Rockmover's design. But this looks simpler. I want to add a spring idler pulley to

Marc,? I believe you have hit the nail on the head (so as to say). I believe the cause is item 1 and is caused by lateral axial play in the DEC worm gear with the scope pointing close to the zenith.

For the G11 axis, the encoder step size is worth about 0.56 arc-sec. However, the mount is constantly moving at 15 arc-sec per second. Does the motor just take 27 discrete steps per second?? Or does

Please adjust the worm properly and don't try to "power through" a stall.

I thought this too, but the mount (worn turn) does have integer multiples. It is defined by the steps per revolution (6400 for the 25:1 gearbox). I noticed in "configure PEC" a Set PEC Period

Good question, about pulse widths!, but ..I do not know the answer. The pulse widths should be varied and capable of being quite short by the uP, but I have not scoped out the actual pulses to see how

I took the plunge and designed and printed my own tucked motor brackets.? They won't win any beauty pageants, but they're functional and super easy to print.?? For simplicity's sake, I went with an

Michael Is the pulse width to the motor fixed in duration such that it results in 256 tics per rev to match the optical encoder or can the pulse width vary. Since the quadriture can determine where

Thankyou Ray. ?Explains quite the opposite effect to many are striving ?for cheers -- Brendan

Ron and Jo- Thanks for the replies. Jon, you're right, I should have searched first. So I just did, and there are far too many topics to really parse out an answer easily, as is often the case in

Anthony I have been regularly imaging with a G 11 G for five years and what I have found so far is that after about two years I was honing in on improving all different kinds of goto and tracking