New idea in construction and performance of turning rotary knife.

The paper describes problems connected with tools having self-propelled rotary cutting edges. In comparison with tools having immovable edges they are characterised by multiple increase of edge durability. In spite of obvious advantages SPRT(e.g. durability of edges) problem causes their construction complexity as well as limitation in machining of surface complexity .Thus there is a concept of their modernisation via fixing edge engine spindle which creates driven rotary tool.