Low profile motorised focuser, Astromaster 130

thingiverse

This is a low profile focuser, initially designed for my Celestron Astromaster 130. It is in two separate parts, one is the focuser itself and the other is a shim plate type thing to mount it onto the telescope. changing the shim should allow the focuser to fit other telescopes. I am still waiting for a dark night to test it with my dSLR. The motor mount is designed to take a 28BYJ-48, I have not included any control options as yet, although I have a test circuit using an arduino nano and an EasyDriver board (http://www.schmalzhaus.com/EasyDriver/). The stepper connects to the focus wheel via a flexible shaft coupling. It will work with parts from the original focuser, though I have used parts from a broken Galaxsee scope instead so as to keep the original focuser intact. I designed it in SolidWorks, primarily to learn the software, so there may be better design approaches and room for improvement. Nuts and bolts are M4, which I cut to length. Screws are 3mm of around 5.5mm length. <iframe width="560" height="315" src="https://www.youtube.com/embed/uWd5Pj_Cr2w" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>