A bit of backstory. I already made mods for my EQ DEC attachment that motorized it. This was ~5 years ago. This worked pretty well after calibrating the worm gear adjustment set screws. However it still had about 5 degrees of backlash, which was pretty high. PHD2 would fail 3 out of 4 calibrations. Regardless when Auto guiding did calibrate and work it would work fairly well for the most part Allowed me to get pretty pictures with my 500mm f/4. For example https://imgur.com/FvWbcOz.
Mod Gallery link:
I had since acquired a 3D printer and have gotten pretty good at making things with it. I decided to try and get back into astrophotography and the 1st thing I wanted to do was making PHD2 calibrate easier with my DEC mount mods. So the first step was to make it easier to turn so I added some gears and clutch that came with the Celestron Motor kit. Now the motor can turn the DEC mount twice as fast and disengaging the clutch I can still hand adjust the angle if I want to.
Edited by CardBoardBoxProcessor, 09 September 2020 - 10:25 AM.