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I thought I would knock some dust off my drafting skills after a small chat with @captain_aggravated@sh.itjust.works
Seeing this image on the tutorial made me realize, FreeCAD seems to be a Technical Geometry Super-Suite. It makes sense that CAD would grow to include all of these things. But I thought sharing the initial perspective of some one who hasn't looked at this stuff in about 18 years might be interesting.
Granted I'm not actually familiar with most of this stuff, and none of it from the POV of FreeCAD. If this can deliver 10% of what I'm looking at, I'm in for a treat.
I have seen both issues, when the sketcher starts to play up sometime I add more constraints to try to "anchor" a tangent in a certain direction but it can make the sketch messy The most reliable way I've found to stop it is small incremental changes e.g. say I want the length of a part to change my 40mm I'll change the size in 5mm increments allowing FC to recompute the model between each step. It's fiddly and frustrating but I can live with it, once you get to understand it's quirks Freecad can be very useful