A turret for tool machine includes: at least a turret body supported by the tool machine; at least a rotating drum supported by the turret body and supporting at least two tool holders upon which are mounted at least two rotating tools the rotating drum being mounted externally rotating around the turret body; at least an electrical spindle positioned in a recess inside the turret body; the electrical spindle extending itself around a vertical axis; the electrical spindle including a motor, a rotating shaft for the transmission of the movement associated to the motor and an engagement portion suitable for coupling to the tool holder; each tool holder extending itself along a vertical axis; the rotating drum being rotatably mounted around the turret body so as to rotate for aligning each tool holder with the engagement portion.

The invention discloses a wheel machining tool. A rough turning tool and a finish turning tool are respectively arranged on two sides of a tool head, the primary declination angle of the rough turning tool is set to 90 to 120, and the primary declination angle of the finish turning tool is set to 85 to 95; the axial height difference between the rough turning tool and the finish turning tool is set to 0.2-0.5 mm; the distance c between the rough turning tool and the tool head is set to 5-8 mm, and the distance b between the finish turning tool and the tool head is set to 3-5 mm. The rake angle of the rough turning tool is set to 12-15, the rake angle of the finish turning tool is set to 14-17.

The invention discloses a wheel machining tool. A rough turning tool and a finish turning tool are respectively arranged on two sides of a tool head, the primary declination angle of the rough turning tool is set to 90 to 120, and the primary declination angle of the finish turning tool is set to 85 to 95; the axial height difference between the rough turning tool and the finish turning tool is set to 0.2-0.5 mm; the distance c between the rough turning tool and the tool head is set to 5-8 mm, and the distance b between the finish turning tool and the tool head is set to 3-5 mm. The rake angle of the rough turning tool is set to 12-15, the rake angle of the finish turning tool is set to 14-17.

In one aspect, a method of preparing a machine tool to machine a workpiece. The machine tool includes an artifact in the machine tool and a probe mounted to a head of the machine tool. The method includes determining a tool offset value for a tool by moving the probe and the tool relative to one another to bring the probe and the tool into contact with one another. Prior to determining the tool offset value, the method includes calibrating the probe by moving the probe and the artifact relative to one another to bring the probe and the artifact into contact with one another.

A turning method for a CNC-lathe includes providing a metal work piece and a turning tool having a coupling portion, a first cutting element having a first cutting edge and a second cutting element having a second nose cutting edge separating and connecting a second forward cutting edge and a second rearward cutting edge. The method includes moving the turning tool in a first direction such that the first cutting edge is in cut, moving the turning tool in a direction such that the first cutting edge is moved away from the metal work piece and the second nose cutting edge is moved towards the metal work piece, and moving the turning tool in a second direction such that the second forward cutting edge is in cut at a second entering angle, which is 5-45, the second direction being in the opposite direction to the first direction.

A turning tool includes a coupling portion extending along a coupling or longitudinal axis, a first cutting element having a first cutting edge, and a second cutting element having a second nose cutting edge separating and connecting a second forward cutting edge and a second rearward cutting edge. The first cutting element includes a first top surface and the second cutting element includes a second top surface. The first and second cutting elements intersect an imaginary circle or cylinder having a center axis perpendicular to the coupling axis. The first cutting element is inclined in relation to the second cutting element by an inclination angle, which is measured around the center axis of the imaginary circle. The second top surface faces in a direction, which is perpendicular to or substantially perpendicular to the coupling axis and perpendicular or substantially perpendicular to the center axis of the imaginary circle or cylinder.

A turning tool includes a coupling portion extending along a coupling or longitudinal axis, a first cutting element having a first cutting edge, and a second cutting element having a second nose cutting edge separating and connecting a second forward cutting edge and a second rearward cutting edge. The first cutting element includes a first top surface and the second cutting element includes a second top surface. The first and second cutting elements intersect an imaginary circle or cylinder having a center axis perpendicular to the coupling axis. The first cutting element is inclined in relation to the second cutting element by an inclination angle, which is measured around the center axis of the imaginary circle. The second top surface faces in a direction, which is perpendicular to or substantially perpendicular to the coupling axis and perpendicular or substantially perpendicular to the center axis of the imaginary circle or cylinder.

A turning tool includes a coupling portion, which extends along a coupling axis, the coupling axis defining a longitudinal axis of the turning tool. The turning tool includes a first cutting element and a second cutting element, wherein the first cutting element has a first cutting edge. The second cutting element has a second nose cutting edge separating and connecting a second forward cutting edge and a second rearward cutting edge. The first cutting element includes a first top surface, and the second cutting element includes a second top surface. A first top surface and the second top surface face in the same or substantially the same direction.

A turning tool includes a coupling portion, which extends along a coupling axis defining a longitudinal axis of the turning tool, and a first and a second cutting element. The first cutting element has a first cutting edge and the second cutting element has a second cutting edge, which separates and connects a second forward cutting edge and a second rearward cutting edge. The first cutting element has a first top surface and the second cutting element has a second top surface. The first and second cutting elements intersect an imaginary circle or cylinder having a center axis thereof parallel to or coinciding with the coupling axis. The first cutting element is inclined in relation to the second cutting element by an inclination angle, which is measured around the center axis of the imaginary circle. The first top surface faces in a direction which is perpendicular to the coupling axis.

A machining unit having a rotary head that bears pivoting tools for machining a non-rotating part centered on a rotational axis of the head. The supports for the pivoting tools are mounted in the head to pivot about respective axes that are parallel to the rotational axis. Each support has a transversely arranged control lever. A control bushing is mounted coaxially on the machining unit and is arranged to slide axially and adopt a first, advanced position or a second, retracted position. At one end of the control bushing bearing is arranged an ellipsoidal control surface so as to cooperate with helical directing surfaces that are connected to the tools in order to execute a plunging movement of the tools. There is provided a phase-offset device, which is arranged to move the control bushing into two, three or four different predetermined angular positions around its axis.