Abstract: A method of induction heat-treating certain surfaces of an article comprising a hub and a plurality of trunnions or shafts extending therefrom, wherein the surfaces to be heat-treated comprise the surfaces of the trunnions. The method employs an induction coil that provides a planar magnetic field that is adapted to the irregular shape of the article, such that the induction coil produces magnetic fields that are adapted to induce currents in, and thereby heat, the trunnion surfaces of the article. The method and induction coil are particularly adapted to provide an induction hardening heat treatment for trunnion surfaces of trunnions used in steel spiders of spider or tripod-type constant velocity joints.

Abstract: A method of induction heat treating the outer surface of articles having an irregular surface shape. The method employs an induction coil that provides a non-planar magnetic field that is adapted to the irregular shape of the article, such that distinct sections of the induction coil produce distinct magnetic fields that are adapted to induce currents in, and thereby provide heat to, distinct sections of the outer surface of the article. The method and induction coil are particularly adapted to provide an induction hardening heat treatment for the outer surfaces of the inner races of Rzeppa-type constant velocity joints.

Abstract: A method of attaching a balance weight to a rotating shaft includes providing a balancing weight which is adapted to be attached to the rotating shaft, wherein the balancing weight comprises a plate with an inner surface and an outer surface, and the plate is curved such that the inner surface has a profile which matches the outer surface of the rotating shaft and the plate includes a plurality of orifices extending through the plate, each of the orifices having an inner wall defining a support surface. An adhesive is applied to the rotating shaft, and the balancing weight is placed onto the rotating shaft with the adhesive located between the balancing weight and the rotating shaft. The adhesive is then cured to form a secure attachment of the balancing weight to the rotating shaft.

Abstract: A method of attaching a balance weight to a rotating shaft includes providing a balancing weight which is adapted to be attached to the rotating shaft, wherein the balancing weight comprises a plate with an inner surface and an outer surface, and the plate is curved such that the inner surface has a profile which matches the outer surface of the rotating shaft and the plate includes a plurality of orifices extending through the plate, each of said orifices having an inner wall defining a support surface. An adhesive is applied to the rotating shaft, and the balancing weight is placed onto the rotating shaft with the adhesive located between the balancing weight and the rotating shaft. The adhesive is then cured to form a secure attachment of the balancing weight to the rotating shaft.