I'm looking for the correct set of assembly constraints that will lock a sphere into the internal corner created by three datum planes or three faces. A simple set of Touch constraints doesn't seem to work.
What version of NX?
Using NX 9, I was able to constrain a sphere to the 3 planes of a datum csys using only 3 touch constraints. You may need to reverse the direction of one or more of the constraints to get the result you want.