sorry, couldn't resist. i'm having some trouble mating two cylinders in an assembly. imagine the following: two slender cylinders, perpendicular and in two separate planes. one cylinder, of course, is fixed. setting the position of the second cylinder is proving difficult. i can make them perpendicular (perp. mate on the axis) and i can keep them in different planes... however.. i need to mate the second cylinder to the first using x,y&z coordinates. that is, i would like to mate the center of a circular face of cylinder 2 x mm to the right, and y mm higher than the fixed cylinder. i realize "right" and "higher" are subjective. imagine two drinking straws... forming an "X" but not touching in the middle. i need to specify the distance between the two and also the ... say "offset" .. that is if they look like an "X" or, if i increase the offset of straw#2, a "y" hope that made some sense. thanks, -tony