Abstract: A first frame is provided, having a pair of parallel pusher bars, the inside surfaces thereof pressing against outer surfaces of a unitary workpiece support block positioned within the frame, and a second frame has a pair of pusher bars having inside surfaces pushing against the remaining outer surfaces of the unitary support block. Stationary drive means cause the independent orthogonal motion of each frame to thereby position the unitary block fitted between the overlapping frames. In a second arrangement, the unitary support block or post means is replaced by first and second pairs of post members in contact with inside surfaces of the parallel pusher bars of the first frame and in contact with outside surfaces of the parallel pusher bars of the second frame, and third and fourth pairs of post members are similarly positioned with respect to the frames.