A tool for a boring machine includes an elongated elongated body extending longitudinally from a proximal end to a distal end, the distal end being shaped to receive a cutting tip, and a cavity inside the body. The tool includes a lattice provided within the cavity and a powder provided in the cavity with the lattice.

A grooving blade for chip removing machining includes a cutting insert pocket and a damping arrangement fixed to the blade. The damping arrangement projects laterally with respect to at least one major surface of the blade. A grooving tool and a method of grooving a metallic workpiece are also disclosed.

A tool holder for a machine tool, in particular for a core drilling machine, having a hollow shaft which has, at one end for coupling to the drive of the machine tool, a connector and, at the other end, a receiving opening with a plurality of openings in which locking elements are accommodated which are radially adjustable between a clamping position and an release position for securing a tool accommodated in the receiving opening. A switching sleeve is provided, which is adjustably mounted on the hollow shaft between a first switching position and a second switching position, a first subset of the locking elements being provided in the first switching position for locking the tool in the receiving opening, and a second subset of the locking elements being provided in the second switching position for locking the tool in the receiving opening, while the adjustment of the respective remaining locking elements is deactivated.

A tool for a boring machine includes an elongated elongated body extending longitudinally from a proximal end to a distal end, the distal end being shaped to receive a cutting tip, and a cavity inside the body. The tool includes a lattice provided within the cavity and a powder provided in the cavity with the lattice.

The present application relates to a cutting tool (2), in particular a boring bar (2) for machining holes (16) separated from each other in an axial direction (4) by a given spacing distance (a), comprising a main body (10) extending in an axial direction (4) with an axis of rotation (R) with at least one cutting element (12), as well as with a number of guide elements (14) for guiding the main body (10) within a guide hole (16A), wherein the guide elements (14) for the axis of rotation (R) are separated by a guide radius (r1), wherein viewed in a cross-section, the main body (10) is divided into a functional region (19) and an eccentric region (20), wherein the cutting elements (12) and the guide elements (14) are arranged distributed over the circumference of the main body (10) over an angular region () of less than 180.

A damping apparatus is provided for damping vibrations of a tool-holding apparatus during machining of a workpiece. The damping apparatus comprises a damping body having two ends on which a respective damping device is arranged, which comprises a bearing pin rigidly connected to the damping body and a bearing bush that surrounds the bearing pin in the circumferential direction. An annular space filled with a damping fluid is arranged between the bearing pin and the bearing bush, which annular space is sealed in the axial direction by two elastically deformable sealing rings. The two sealing rings each comprise first and second abutment regions as well as a resilient intermediate region arranged therebetween. The first abutment region is bonded to the bearing pin and the second abutment region is bonded to the bearing bush. The intermediate region is elastically deformable relative to the bearing pin and the bearing bush.

A resonant frequency dampened through-coolant machine tool for selective mounting to machining systems for precision vibration free machining and has an elongate tool body. An internal dampening chamber is defined within the machine tool body and contains a resonant frequency dampening mass that is moveable within the dampening chamber. Axial and diametrical tunable dampening devices support the dampening mass in spaced relation with internal walls of the dampening chamber. A tuning piston is moveable within the machine tool body and has a tuning flange that is disposed in contact with one of the axial tunable dampening devices. The tuning piston has a pair of oppositely angulated surfaces that are selectively engaged by angulated drive heads of adjustment screws that are supported by threaded openings of the tool body and are rotated to selectively drive the tuning piston forwardly or rearwardly for precise tuning activity. Internal components of the machine tool define a coolant fluid flow passage to conduct a jet of coolant fluid to the metal cutting interface.

A tool chuck for clamping a tool in a machine tool, having a base body and a sleeve part protruding therefrom, which sleeve part forms a tool holder for fixing a tool shaft in a frictional, nonpositive fashion; a cavity in which a vibration damping component is accommodated is provided in the tool chuck.

A tool for roughening a borehole surface. The tool includes a coupling portion for clamping the tool; a tool head for machining the borehole surface; and an extraction duct. The coupling portion is disposed at a first end of a tool shank and the tool head at an opposite, second end of the tool shank. The tool head has a cutter disposed circumferentially on the tool heat The tool head has a slit, which passes through from one side to the other and which, starting from an end face of the tool head, extends axially along a longitudinal axis of the tool. The extraction duct extends at least partly axially along the longitudinal axis of the tool for extraction of drilling dust. The extraction duct, starting from the end face of the tool head, extends inside the tool shank and discharges circumferentially into a connecting opening in the tool shank.

A method for reducing regenerative chatter in chip-removal machines wherein a tool head (2) machines walls of a workpiece (1) by means of at least one chip-removal tool and during this machining, the tool head is vibrationally excited and a loose additional mass (m.sub.z) is moved by the vibration. The additional mass randomly touches the tool head (2) in first position or randomly has no connection to the tool head (2) in second position, and thus the total mass of the tool head (2) is randomly changed by the amount of the additional mass (m.sub.z). This change in mass of the tool head in turn changes the frequency of vibration.