the invention u043eu0442u043du043eu0441u0438u0442u0441u00a0 to engineering and can be used in the manufacture of helical surfaces of navigation of screws. purpose u0438u0437u043eu0431u0440u0435u0442u0435u043du0438u00a0 u00a0u0432u043bu00a0u0435u0442u0441u00a0 to u0448u0435u043du0438u0435u0442u043eu0447u043du043eu0441u0442u0438 when processing screw surfaces with a point contact.the length of the u043eu043fu0440u0435u0434u0435u043bu00a0u044eu0442 u043du0430u0440u0435u0437u0430u043du043du043eu0439 accumulated error of step, and its u0438u0437u043cu0435u043du00a0u044eu0442 corner u043fu0440u043eu0444u0438u043bu00a0 screw surface by u043eu043fu0440u0435u0434u0435u043bu00a0u0435u043cu0443u044e of u0441u043eu043eu0442u043du043eu0448u0435u043du0438u00a0 yes arctg (2 d / r + 2 d), where d is the u043du0430u043au043eu043fu043bu0435u043du043du0430u00a0 fault step screw on the u043du0430u0440u0435u0437u0430u043du043du043eu0439 part; r is the nominal step screw surface; it is the u0438u0437u043cu0435u043du0435u043du0438u00a0 angle u043fu0440u043eu0444u0438u043bu00a0 screw u043eu0432u043eu0439 u043fu043eu0432u0435u043eu0445u043du043eu0441u0442u0438 2 il.
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