Designed and 3d printed a sky tracker for gopro night lapse (or other) and wanted to share. Nema 17 w/ 1/32 microstepping driver into 100:1 planetary gear to 12:90 pinion/annular. Total geared reduction of 750:1 should allow for 55.7 microsteps per second to get full revolution in one sidereal day.
Elevation is driven by worm gear with screw clamp to lock. Leveling is achieved via 3 adjustment screws. This is untested, having just completed the hardware build this morning. Still need to wire up and program the electronics. I'll post back after first test.
by DLplasticFantastic