It took a lot more math than I expected to make the intersections of the dovetail arcs the same width for both radii. If I were better with freecad I could make this a constraint and have the system calculate it.

@smellsofbikes did you end up creating using the revolve tool? Or did you make a cut tool and use booleans? What was your approach that required math? I hope between FreeCAD and Fusion, I’d love to use FreeCAD alone but I find as a newbie Fusion is way more forgiving.

@done I used the cutting revolve on this, and my math was crummy: drawing it out on graph paper and doing some trig to figure out the length of the intersecting angle was and then just assigning a value to that constraint in the sketch. @mcdanlj did a much better job in his version of it, also in the replies.
Freecad is for sure a higher learning curve. I've been using it for years so I'm kinda used to it.