FIELD: construction of wells. SUBSTANCE: invention can find use for drilling of oil and gas wells, as part of screw pump employed for production and transfer of oil. Limits of variation of thickness of corrosion- and wear-resistant coat of rotor presented in dependence ha/hf = (2-8), where ha is thickness of coat on tooth point; hf is thickness of coat in tooth space was found theoretically and experimentally proceeding from experience of many years of operation of such structure of rotor of face hydraulic machine. EFFECT: prolonged service life of rotor. 3 dwg
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