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Changing of the primary geometry of products in the process of operation and increased wear of the working surfaces of the parts are among the main reasons for reduction of their operation life, failure of machines and mechanisms. The intensity of the wear of the parts is dependent on the type of machine, its power, operating conditions, material of the parts and methods of protection. In most cases, the repair is economically expedient, as the cost of restoration of the worn parts is not more than 30-40% of the cost of new ones [1]. An effective method of solving the problem of providing high performance machinery is the application of very hard, heat-resistant and corrosionresistant coatings on working surfaces of the parts with the use of plasma, electron beam, detonation and other technologies. Chromium-nickel powders such as ПГ-СР3, ПГ-СР4, ПГ-10Н-01 have found widespread use in the process of hardening and restoration of the parts of machines [2]. To provide high operational properties of the coated parts as a result of the restoration an urgent task is improving the processes of their processing. Low machinability of chromium-nickel coatings is a consequence of their high hardness, high ability of abrasiveness of carbide and boride inclusions, high temperatures occurring in the cutting area and other factors. In such circumstances, tool materials must have high hardness and strength in a wide range of temperatures and pressures, sufficient toughness, good thermal conductivity, low tendency of adhesion to the work material and diffusion. Currently, a great field experience has been accumulated of the use of ultra-hard materials [3-5] for machinery of the hard coatings. In the industry the most widely used are the composites K01, K10 and Kiborit made of polycrystalline ultra-hard materials (PCBN), cutting conditions at turning of chromiumnickel coatings are given in Table. 1. Table 1 Cutting conditions at turning of chromium-nickel coatings Tool material Cutting conditions velocity v, m per s Carrying-in S, mm per rev depth t, mm

Fine turning of the vehicle formed components coated by the ultra-hard polycrystalline tools