Turning tool and turning method for CNC-machines

A cutting tool for turning, the cutting tool comprising a coupling portion, an intermediate portion and a cutting portion,

• the intermediate portion extending between the coupling portion and the cutting portion, and the intermediate portion extending along a longitudinal center axis thereof, the cutting portion including a first and a second nose portion, the first and second nose portions being permanently connected, the first nose portion comprising a first cutting edge, a second cutting edge, and a convex nose cutting edge connecting the first and second cutting edges, the first and second cutting edges forming a nose angle less than 90°, wherein a longitudinal center axis of the coupling portion defines a tool rotational axis, the longitudinal center axis being parallel to or co-linear with the tool rotational axis, the cutting portion having a top surface, the top surface facing away from the coupling portion, wherein the first and the second nose portions each form free ends of the cutting tool, wherein in a top view, the first and second nose portions form an angle of more than 90° relative to each other measured around the longitudinal center axis of the intermediate portion, and wherein in the top view a first extension line co-linear with the first cutting edge and a second extension line co-linear with the second cutting edge extends on opposite sides relative to the longitudinal center axis of the intermediate portion, wherein the coupling portion and the intermediate portion jointly form a tool body, the cutting portion being in the form of a first cutting insert, wherein a front end of the tool body is defined by a first insert seat for the first cutting insert, wherein the first cutting insert is detachably clamped in the first insert seat by clamping means, the first cutting insert including a bottom surface opposite the top surface, wherein a side surface connects the top and bottom surfaces, wherein a mid-plane extends mid-way between the top and bottom surfaces, and wherein the nose cutting edge is in the top view convexly curved having a radius of curvature of 0.15-1.3 mm, wherein the clamping means is in the form of a clamping screw, wherein the first cutting insert includes a hole for the clamping screw, the hole intersecting the top and bottom surfaces, wherein the hole defines a first cutting insert center axis, wherein the first cutting insert center axis is co-linear with the rotational axis, and wherein the longitudinal center axis is co-linear with the tool rotational axis.