To follow up on GT22, it's not by opening another post that you will get more responses, especially if you don't bring new elements and in a whiny tone.
It's a habit not to get into regardless of the place, whether IRL or virtual (forums in particular).
Stefbeno and gt22, it's my fault I have trouble expressing myself.
My real problem is in the simulation under mecha3D. The software does not recognize the cam connection and therefore cannot calculate the simulation.
On the other hand gt22 I don't see why you say that I didn't listen to the advice given. On the contrary, I tried each time by detailing as much as possible. And stefbeno if I don't have a new element to bring to the table, it's because I didn't manage to simulate my movement. Otherwise I won't ask questions. Sorry if my post seems "whiny" to you.
A.Leblanc, it's not a bad idea... I'll try it as soon as possible.