Possible cylindrical joint/mate bug

[trhodesL6HUL]

I think I found a cylindrical joint/mate bug (since I haven't found someone that can explain this behavior).

There are two cylindrical mates among the three 5-way connectors. One between the left and center connector, and one between the right and center connector. When a third mate is added between the left and right connectors, Inventor says adding the mate causes a conflict or it locks the assembly components as shown in the second picture.

I hope this is just me doing something wrong. But after asking several people, I suspect that it might be a bug. Is anyone able to recreate this problem?

I've also posted about this on the Fusion 360 support forum: https://forums.autodesk.com/t5/support/possible-cylindrical-joint-bug/td-p/7047834

[Anonymous · Accepted solution]

The angle you used on Sketch1 should be 31.71747441 deg. 

[TheCADWhisperer]

Using @Anonymous suggestion -

[WHolzwarth]

Here's a master file (2017) for starting the model.

[trhodesL6HUL]

How does that angle affect mating three connectors together? No matter what the angle is, they're all at the same angle. Three should mate without a problem, since it's just making a triangle, no?

[Anonymous]

You designed a icosahedron, so you must care about the external triangles (60deg.), but also the angles of the internal triangles otherwise the parts will not match the alignment along the axis. See the attached ipt for better understanding.