FreeCAD Demo: Bike derailleur hanger

thingiverse

This mostly a demonstration of how to make replacement parts using FreeCAD. It's the rear derailleur hanger from a Giant Peloton 8200 road bike, built sometime in the 90's. https://www.youtube.com/watch?v=UYIfG1oqvsg For this particular part, I'm not sure how well the 3D printed version will work (testing pending), just due to the strength requirements, but at least I'll have the CAD on hand for when I (eventually) get a CNC router mill. And again, this is a demo. I'm including the photo I worked off of, the FreeCAD file itself, and exports from that file both with threads and without (you can export any arbitrary part from a FCStd to OBJ or STL). Go ahead and play around with them, see if you can better, an use the experience to make stuff of your own. If I make updated versions of the FCStd, I'll probably update them under different names, leaving the original intact, so you can see what was made in the video. Off the top of my head, one easy improvement I could make would be sketching the big hole separately, then pocketing that out of the fusion object, so the diameter of that hole could be changed (eg. to adjust for printer tolerances) without editing multiple sketches/pads. There's a couple other videos I link to in the description of the YouTube video there, but I can't link them here without Thingiverse automatically embedding them in the page. I don't want to misrepresent those creators' work as my own on here, so you'll have to click through to get to those.