How to mate a cylinder and a cube

Hi David, Besides the obvious face mating etc. you can mate sketch entities or planes like Front - in the assy find your parts and drill down to the appropriate item right click and Show. N.B. Make sure that you have enabled viewing of them in the View menu on the main toolbar. Use them as selectable items. HTH

The most robust way is to think ahead when you are building the parts about how you are going to mate them. Build the cube symmetrical to your base planes. Do the same for the cylinder. Then you can use the planes to mate them.

Another method, which also requires thinking ahead, or going back when you don't, is to make your sketches with center points, show the sketches, and mate the points. (For the rectangular face, make construction line diagonal between corners and put a point on the line, with the relationship of midpoint to the line.)

Jerry Steiger Tripod Data Systems "take the garbage out, dear"

Adding to what you have already suggested. An additional sketch point somewhere along the length of the diagonal construction line will also remove a third degree of freedom (i.e. rotational orientation)

Kman