bdavis wrote: It works very well indeed, and my first tests with it have me slobbering at the improvements in guiding error. The old CGEM motor board and plastic spur gear could manage a 2.5 arcsec guide error RMS on a really good day. My initial tests with Onstep reduced that to around .75-1.0 arcsecs, and I haven't really tuned it yet, or connected the timing signal from the GPS to the oscillator on the Onstep board. I'm currently learning Fusion 360 and designing a case for it. Already printed the motor mounts for it, but had to back up and re-print them with a more temperature resistant plastic, which led to experimentation with annealing the plastic, etc.

Not sure about the CEM70 for Onstep, but the CGEM can be readily Onstepped with a remarkable improvement in accuracy and function. You can use mainboards that also support dew heater control, focuser control, and more. The whole rig can be customized in both software and hardware in a lot of ways, depending on your skill level.


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