OnStep your Dobsonian with Zero Woodworking - Part 1

Parts and Assembly This is for GSO 10" Dobsonians with premium Altitude bearing tension adjustment mechanism Apretura AD10, Zhummel Z10, Orion SkyLine 10" Fitting to other diameters of the same lineup (8" and 12" mirrors) will require a different belt length and a minor modification of the motor clamp block. Thingiverse: https://www.thingiverse.com/thing:553... OnShape CAD: https://cad.onshape.com/documents/f11... Big thanks to Bryan Pryor (   / bryanpryor  . His implementation of friction drive inspired me to design this project.    • OnStep 12" dobsonian first success!