I have an Assembly here where I have 1 mate that I would like to make and it is not working....
1) tube frame structure that I created as a part with two sketches one is the path to follow and one is the thin walled tube profile. simple.
2) is the rest of the frame with Aluminum fittings / supports in which the tube goes through.
When I attempt to apply almost any type of mate it does not work and a message comes up saying 'selected entity is not valid for this type of mate'....
Basically I just want to apply two coincident mates which would center out the frame.
see the image below.