Patent ID: 8186251

Claim:
Device for turning rotationally symmetrical surfaces of a workpiece, comprising a rotary drive of the workpiece rotated about a workpiece rotational axis, wherein the rotation of the workpiece produces a cutting speed of machining, comprising a tool having a cutting edge and comprising a feed of the tool, having a feed rate substantially lower than the cutting speed and by means of which the cutting edge, with an active point which shifts along the workpiece, comes into engagement with the workpiece, characterized in that the tool moves about a tool rotational axis, the tool rotational axis parallel to the workpiece rotational axis or at an angle to the workpiece rotational axis corresponding to a surface angle of the symmetrical surface of the workpiece, to cause the cutting edge to move on a circular arc-shaped feed path and cause the tool to advance in a circular arc motion, and in that the cutting edge has helix shaped cutting edge coaxial to the tool rotational axis which avoids forming a twist on the turned surface of the workpiece which would result from sequentially engaging the workpiece at increasing cut depths by causing the cutting edge to travel in an axial direction across an axial width of the cutting edge during the movement of the tool about the tool rotational axis, while limiting the linear engagement of the cutting edge against the workpiece during the cutting operation.