everything is attached with fixed and hinge joints, BUT when i try to start i get some problems, i have some movement (not rotations of the hinges ) i give you pictures to lets you understand :
So are you simulating this in Unity or are you getting feedback data from the robot and trying to inject it into Unity?
If you’re creating a simulation in Unity then we need to see info on the joints. If you have data from the robot realtime then you don’t need to use Physics in Unity. Either you own the transform position and take full responsibility or you surrender it to the Physics calculations entirely.
For Hinge Joints the Connected Anchor XYZ is the resting point of the rigidbody so it’s going to snap into that position, relative to the Anchor XYZ. Any fixed joints down the line would also be affected.