Method to machine a metal work piece by turning

A method to form a surface on a metal work piece comprising:

• a first machining step of providing a turning insert including a first cutting edge, a second cutting edge and a convex nose cutting edge connecting the first and second cutting edges, selecting a nose angle formed between the first and second cutting edges to be less than or equal to 85°;
• arranging the orientation of the second cutting edge such that it forms a back clearance angle of more than 90° in a feed direction;
• positioning all parts of the turning insert ahead of the nose cutting edge in the feed direction;
• rotating the metal work piece around a rotational axis in a first direction;
• and
• moving the turning insert in a direction parallel to or at an angle less than 45° relative to the rotational axis such that the first cutting edge is active and ahead of the nose cutting edge in the feed direction and such that the surface at least partly is formed by the nose cutting edge.