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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

My Goto's with my G11T 1:2 belt drive and 25:1 McLennan gearbox are spot on. That works fine. And when I used a 50:1 McLennan and the stock 3 transfer gears on tucked Titan RA the GoTos also worked

Hi Michael, PEMPro will retrieve the count from the Gemini and use that to calculate the PEC curve. In this case, the number would be 6400, which would be wrong, so I suspect the resulting curve would

Nice catch, Ray. That could explain the puzzle... and also my puzzle on my 1:2 belt drive G11T. (Please see my PEMpro question at the bottom of this email...) Some thoughts... The number of data

32000 is above the maximum number of ticks, which I think is 25600. The tick count probably wraps at 25,600 so 32000-25600 = 6400, which would explain the 1/5 cycle. -Ray

Ray, PEC training quits after 48s, 1/5th period of the worm. I think this has to do Pec working with 6400 ticks instead of 32000. Peter

Hi Michael, How are you determining that it is quitting early? And, how much earlier does is it quitting for you? And again, using an autoguider to create a PEC curve is not going to give the best

Peter, The difference between 89754 and 89754.2 over 3 hours is about 0.4 arcsec; it is not likely the cause of the mount running slow. Did you do the test I suggested in a previous post? Did the PEC

Yes, Anthony. This has been hashed through many, many times before. Suggest you just plug regrease or relubricate in the upper right hand search box. I did mine after 3 years and after I noticed the

On one hand, I'm a little bit happy to find out about a fix to this problem. On the other hand, I feel some righteous anger boiling up. Ever since I had this mount, it would GOTO correctly 97% of the

I agree with Chip Louie. In my case going to the McLennan 25:1 gearboxes I was mostly motivated by the fact that the front and back are metal, not plastic so the mounting of the motor on to the