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Tripod joints are used on the inside of the constant-velocity shaft. They allow homokinetic torque transmission and thus an axial movement that enables length compensation. These parts are produced by means of warm and cold forging. The inner side is then ready for induction hardening. Together with the customer, the internal geometry is optimized during part development in such a way that following induction hardening no hard machining is necessary – hardening distortion thus needs to be pre-corrected.