I was working on a wabble drive: https://www.youtube.com/watch?v=KCLrzAtq3j4
I'm making the gears - if you can call them that - with a series of precisely-placed connected arcs:
I had lots of trouble doing this. I finally succeeded after much trial and error regarding the sequence of arcs to draw next to get it to work.
Here is an illustration of the problem. I had these two segments drawn, and I wanted to connect them together with an arc:
When I drew that connecting arc, things went haywire. Connections that were tangential clearly became non-tangential. One of the arc's radius constraint was removed. And the arc that I drew ended up with a radius constraint that I didn't specify:
I'm curious if others have this problem. I've uploaded the mpc done with Designer 3.102. I started this project with Designer 1, but it misbehaved so badly I could not get very far. At first Designer 3 worked better, but it too had issues. BTW I have had similar problems in the past when drawing other complex connected lines.