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Jim, Those part numbers define on complete coupler for 1/4" on one end and 3/16th on the other. You need all three pieces. Let me get my order in first though just in case they are in short supply?

Allen, You might be interested in this discussion /g/Losmandy_users/topic/changing_the_servo_motor/83484031?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,83484031

Which one do you recommend? ------------------------ Jim W Phoenix, AZ. USA

David, I found some ABEC 5 bearings on EBay, 5 for $10.64. Item number 25149579011. They will likely greatly reduce the bearing fundamental. They did a great job for me. What where your Ra/Dec values

Eric, Yes, and I assume 20480 with a 80:1 gearbox. The count value at which it rolls over is defined by PECmax. My test is with a PEC file that has PECmax set to 32000. In that case it should roll

Jim, I hate the grub screw Oldham coupling they are an abomination. Those grub screws distroy your worm if you ever want to replace the bearings. You end up filing the thing which will ensure a larger

Peter, the PEC index will roll over at 12800 with 50:1 gearbox numbers entered in the Gemini, not 25600. And you don’t need to load a PEC file, the PEC index is always running. Eric

Okay so last night was a good night and I think I got a lot accomplished with good seeing. Attached is a guide log for PHD2. I did a calibration, guiding assist and guided/unguided runs then

Eric, I see the pec pointer on the sate page. Thanks! I'll run my hand made pec file and see if it rolls over at 25600. Peter

Eric, I just looked at the document. This has to be a variable length issue possibly. ?Will?move the 125:1 gearbox to Dec and go with 50:1 for Ra. I just bought a second one? If anyone what's to

There are other sources for non-integer multiples. For example, the 76-second cycle found in some mounts: http://helixgate.net/G11opw8.html -Ray

Here's my concern.? The nylon center piece is worn enough where the mating metal coupler can move along the axis and almost pull out on one side.? With the SLW's the 2 cap-screws holding the?worm

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