Abstract: A honeycomb manufacturing expander mechanism which includes a cam or guide plate having two sets of guide slots respectively extending outwardly in opposite directions away from a center portion of the plate. The inboard ends of the slots in each set are equally spaced from each other. In extending outwardly, the slots in each set converge such that the spacing between the outboard ends of each slot is less than that of the inboard ends. Disposed beneath the plate are a pair of mutually parallel bars, each carrying a plurality of expander pins which extend upwardly through corresponding slots in the plate. The bars are movable in concert from positions beneath the inboard ends of the slots to positions beneath the outboard ends of the slots by one or more motor-driven lead screw drives.