The planetary precessional transmissions represent a new principled type of the mechanical transmission. The specific of the relative sphere-spatial movement of the precessional gearing elements makes the sliding friction to persist. The study of the contact between two working surfaces of one gearing is very important, because the duration of the gearing running, its reliability and efficiency depend on the materials behavior, from which are produced the prehension elements. The study of the contact in the kinematical precessional gearing has a major importance, because in the kinematical precessional gearing there is present the slipping friction, which leads to big power losses and to a big heat elimination in the contact zone.
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