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Sinumerik 840D includes several predefined cycles that allow the user to effectively create NC programs. In addition to the possibility of using these cycles, Sinumerik also has the possibility of creating new user-defined cycles. The article deals with possibilities of designing new cycles that extend the options available Sinumerik 840D in a simulated environment WinNc. Designed cycles focus on the use of advanced machining options such as jeweling or engine turning and trochoidal milling.