Self-propelled rotary turning tools and actively driven rotary tools are characterized by different chip formation and different conditions of surface layer. Chips creating after conventional machining is influenced by specific patterns and can be affected by the machining scheme as well as the tool durability. This is a possible replacement for the coating effect of tool functional surfaces. The paper is focused on the issue of the state of surface layers after the application of the unconventional turning scheme. The state of the surface layers is evaluated by X-ray diffraction.Keywords: Coating effect, functional surfaces of tool, self-propelled turning tool, turning
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