When I try to orbit this assembly:
It's not like you would expect because the center of navigation is taken between the assembly and the constraint of 2 concentric circles:
Se when I navigate with my 3D mouse or midle mouse button my assem
You haven't finished that post properly, but I'm guessing you're asking how to get the centre of rotation to be about only the geometry?
Try hiding anything you don't want to be part of the scene for rotating. That being said, I'm not sure why your coaxial centre is showing at all...
I'm guessing you're asking how to get the centre of rotation to be about only the geometry?
You guess perfectly.
The centre is only showing when I choose "Edit definition" of the sketch. When I hide the sketch the center of navigation is in the center of my geometry, but why is the coaxial centre used to define the navigation centre?
When I show the sketch and choose for "iso view" I see:
So you don't see the coaxial center but when navigating it is counted to define the center of navigating...
The software assumes that anything shown is part of the view and centres the rotation based on that, which is not an unreasonable assumption most of the time - it seems sensible that you'd want to see all of the sketch you're working on.
Obviously in your case it's a bit different as the centre mark is very far away. You have 2 options;
* For mouse rotation, under the view tab, use the Rotate button to select a rotation point to rotate about.
* For 3d mouse, you should have an AddIns tab with a Select rotation point button for your 3d mouse.
It makes sens for everything shown, but a constraint is "nothing".