A turning method for a computerized numerical control lathe performs the steps of: providing a cutting tool including a coupling portion, an intermediate portion and a cutting portion, a longitudinal center axis of the coupling portion defining a tool rotational axis, the cutting portion including a top surface, a first nose portion, the first nose portion including a first cutting edge, a second cutting edge, and a convex nose cutting edge connecting the first and second cutting edges; providing and rotating a metal work piece around a work piece rotational axis, which is set perpendicular to the work piece rotational axis; making a first pass where the first cutting edge is active and the second cutting edge is inactive; making a second pass where the first cutting edge is inactive and the second cutting edge is active; and rotating the turning tool around the tool rotational axis.

This disclosure relates to a machining tool having a base body which is rotatable about a rotary axis and movable in a feed direction along the rotary axis, at least one cutting element which is fixed on the base body and has a front cutting edge pointing in the feed direction, and a flute associated with the cutting element and formed by a recess in the base body. In order to control the chip flow, according to this disclosure, a flute cover mounted on the base body is proposed, which outwardly covers a chip removal area of the flute adjoining the cutting element.

A turning tool for internal turning of a metal work piece having a rear end, an opposite forward end and a longitudinal center axis extending therebetween. The first nose cutting edge includes a first radially distal point having an associated first rake face and separates and connects a first forward cutting edge and a first rearward cutting edge. A second nose cutting edge of the turning tool includes a second radially distal point having an associated second rake face and separates and connects a second forward cutting edge and a second rearward cutting edge. The second radially distal point is positioned ahead of the first radially distal point. The first forward cutting edge forms an acute first entering angle, the second forward cutting edge forms an obtuse second back clearance angle, and the second rearward cutting edge forms an acute second entering angle.

Rotating tool holder mountable on a revolving multi-station tool holder turret of a numerically controlled lathe or turning/milling center, the tool holder including a support body that is removably fixable to the turret and including a shaft that is rotatable around a rotation axis and releasably connectable to a drive of said turret, the tool holder further including a motorized drive arrangement that rotates a main body with respect to the support body around a rotation axis autonomously and independently of the rotation of the shaft, in order to position a seat of a cutting/drilling tool, provided on the main body, in a preset angular position.

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, 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.

Cutting tool, which is driven with its shaft so that it rotates about its longitudinal axis or in a pushing and pulling manner, and wherein further shaft-side secondary cutting tools are fastened to the shaft, wherein the secondary cutting tools are fastened to the shaft of the cutting tool in an exchangeable manner.

A damper assembly for use with a non-rotating tool holder includes a hollow ram for supporting a non-rotating tool and a damper assembly mounted in the hollow ram for absorbing vibrations of the ram. The damper assembly includes a front plate and a rear plate, an upper tie rod and a lower tie rod extending between the front plate and the rear plate, and a damper mass mounted between the front plate and the rear plate. Ring dampers are mounted between the damper mass and the front and rear plates, and suspension springs are mounted between the upper tie rod and the lower tie rod. The suspension springs carry the weight of the damper mass so that the ring dampers do not have to carry the weight of the damper mass, and the damper mass is free to respond to vibrations in the ram.