the present invention relates to a rotor shaft and rotor body assembly in an x - ray device , and it method of manufacture , that resists the formation of cracks in the braze joint due to the elimination of horizontal shear planes therein . the inventive structure also comprises an enlarged proximal end of the rotor shaft and an inventive assembly method that prevents the rotor shaft from de - coupling from the rotor body should the braze material entirely fail during field use .