i was just doing a quick exercise using a model of 2 halfs of a dumbell .a ball on each end of half a bar and want to connect the 2 faces of the bar to make 1 whole dumbell .
trouble is i cant spin the 2nd half of the dumbell to get the 2 faces to connect and make 1 whole dumbell .
the 2 halfs are both in the same orientation so i cant spin them about to get the 2 faces of the bar to mate connect ,any answer to this?
Check your mates to each part. If you have the front planes or which ever planes mated together then you can't rotate part in assembly. I would undo all mates to the one model then redo the mates and see if that works.