Azimuth motor mount for dobsonian rocker box telescope to OnStep conversion
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10:1 planetary gearbox stepper motor holder in a slot in the bottom of the rockebox to drive a wheel on a lazy susan
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This bracket holds a StepperOnline 10:1 Planetary Gearbox Nema 17 Stepper Motor for Az Axis (17HS15-1584S-MG10) so that it can slide in one dimension (pulled by springs) to hold a drive wheel firmly against a Lazy Susan bearing. [It would probably also work for the 100:1 gearbox.]
Unless the base of your rockerbox is the exact same thickness as mine, you will need to edit the OpenSCAD model to edit the "board_thickness" parameter to match your specific Rockerbox bottom thickness.
I added guide slots on the top, but didn't end up using them, as I got the fit tight enough against the slot I cut out of my rockerbox so that I didn't need extra guiding constraints.
I'm using M3 SHCS as attachment points for the springs.
Website with full build details here: https://www.summet.com/blog/2026/10/12/upgrading-a-dobsonian-push-to-rockerbox-telescope-to-automated-goto-and-tracking-control-with-onstepx/