Abstract: A part registration system for registering one or more parts relative to a robot having a robotic arm that defines a plane of optimal reach at a vertical position is provided. The part registration system includes a tray support rack, a tray support shelf and a tray transfer arrangement. The tray support rack is configured to support a plurality of trays for holding one or more parts. The tray support rack has a plurality of tray support regions in which one or more trays may be supported. The plurality of tray support regions are at different vertical positions. The tray support shelf is vertically adjustable relative to the tray support rack. The tray transfer arrangement transfers the trays between the tray support rack and the tray support shelf. Methods are also provided.