Abstract: A high helix, multi threaded screw shuttle transfer assembly (10) for transferring high load devices at high speeds includes a screw (18) having threads (23). Standoff brackets (26) and bearing housing (36) rotatably support and journal the ends (20,22) of the screw (18). A drive motor (50) connected by a belt (52) to a pulley (48) on the screw (18) rotates the screw (18). A nonrotatable nut (54) having threads (56) coactive with the threads (23) of the screw (18) travels along the longitudinal length of the screw (18) during rotation thereof. The assembly (10) is characterized by the threads (23,56) of the nut (54) and the screw (18) each being high helixed and multithreaded.

Abstract: The threads of a nut on a multithreaded, high helix lead screw are formed by disposing a nut over a lead screw where the center hole of the nut is larger than the threads of the lead screw. Polymer material is filled into the space between the nut and the lead screw and cured to form a high helix, multithreaded nut which has threads complimentary to the threads of the lead screw.