A tool or workpiece holder with a receiving body and a clamping device for clamping a tool or a workpiece in a receiving opening of the receiving body. The clamping device comprises a first clamping element, which can be moved in a receiving portion of the receiving body at right angles to a central axis of the receiving opening, and a second clamping element, which can be moved relative to the first clamping element at right angles to the central axis of the receiving opening by means of an actuating element. The second clamping element has conical bottom clamping surfaces on the two clamping elements for inserting the tool or workpiece into the receiving opening. An ejecting mechanism is disposed on the first clamping element for ejecting the tool or workpiece from the receiving opening when the clamping elements are moved into a disengaged position.

A cutting tool includes a holder having an upper jaw and a lower jaw, and an insert clamped between the jaws. A large-diameter hole in a lower-jaw side of the holder communicates with a lower-jaw channel, and a threaded hole in an upper-jaw side of the holder communicates with an upper-jaw channel. A threaded member has a head, a closed-bottom hollow open to the head, branch holes through which the hollow communicates with an outer circumferential surface thereof, and a screw-driving portion in a front end thereof. The threaded member is inserted from the large-diameter hole and screwed into the threaded hole until a front surface of the head seats on a bearing surface of the large-diameter hole and clamps the insert. Then, the large diameter hole, the lower-jaw channel, the hollow, the branch holes, and the upper-jaw channel are in communication for supplying coolant to the insert.

A clamping block receives a parting blade having an internal coolant guide. The clamping block includes a parting blade seat having a contact face for a lateral face of the parting blade. The parting blade may be received in a first installation direction and in a second installation direction. A first coolant exit opening for transferring coolant into the parting blade in the first installation direction, and a second coolant exit opening for transferring coolant into the parting blade in the second installation direction, are configured on the contact face. A first internal coolant duct structure connects the first coolant exit opening so as to communicate with at least two different first coolant entry openings, and a second internal coolant duct structure connects the second coolant exit opening so as to communicate with at least two different second coolant entry openings.

There is proposed a method for examining the clamping state of a tool holder or tool which is clamped in a tool clamping device of a rotor unit of a motor-driven machine tool unit, with the spacing of the sensor head from a component of the rotor unit being measured, with a recording of at least one time and/or position-related sequence of the spacing values measured with the sensor head, wherein for improved integration of the method the recording of a first and a second time and/or position-related sequence is carried out during an acceleration of the rotation of the rotor unit with respect to the stator unit, in particular when the rotor unit is started up, wherein the time and/or position-related information of the sequence vectors of the first and/or second sequence is scaled using the respective associated current speed (v.sub.0).

A tool holder for a tool for machining a workpiece. The tool holder comprises a cutting insert receptacle for receiving a cutting insert, wherein the cutting insert receptacle comprises an upper clamping jaw for abutting an upper surface of the cutting insert and a lower clamping jaw for abutting a lower surface of the cutting insert opposite the upper surface. Further, the tool holder comprises an internal coolant channel extending inside the tool holder between a coolant inlet opening and a coolant outlet opening, wherein an end portion of the coolant channel extending inside the upper clamping jaw along a channel center axis opens into the coolant outlet opening. The coolant outlet opening is arranged at the upper clamping jaw and configured as an elongated opening. A width of the coolant outlet opening is smaller than a height of the coolant outlet opening measured orthogonally to the width of the coolant outlet opening. The end portion of the coolant channel is also elongated in a cross-section orthogonal to the channel center axis. A width of the end portion measured orthogonal to the channel center axis is smaller than a height of the end portion measured orthogonal to the channel center axis and orthogonal to the width of the end portion.

A grooving tool configured to form a substantially V-groove shaped breaking promotion portion for breaking and splitting a large end part of a connection rod at the large end part along a cutting direction, comprising a rough-machining blade to cut a peripheral surface of a penetrating hole provided at the large end part, a finishing blade to finish a portion cut by the rough-machining blade, and a support member supporting the rough-machining blade and the finishing blade in order along a direction opposite to the cutting direction, wherein the rough-machining blade is configured such that a height h1 of its blade tip from a bottom face of a first cutting-blade attachment portion is lower than a height h2 of a blade tip of the finishing blade which is made of a higher-hardness material than the rough-machining blade.

A turbine rotor includes a rotor body and a balancing weight slot defined in an exterior circumference of the body. The balancing weight slot has a first axial width and a first radially outward facing surface at a first radial distance from a rotor axis. The rotor also includes a balancing weight entry port defined in a portion of the exterior circumference of the rotor body and aligned with the balancing weight slot. The balancing weight entry port has a second axial width greater than the first axial width and a second radially outward facing surface at a second radial distance from the axis of the rotor body that is smaller than the first radial distance. A method may include machining the entry port into the rotor with a tool. The method may be applied to a new rotor, or to remove cracks initiating from a previous entry port.

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 turbine rotor includes a rotor body and a balancing weight slot defined in an exterior circumference of the body. The balancing weight slot has a first axial width and a first radially outward facing surface at a first radial distance from a rotor axis. The rotor also includes a balancing weight entry port defined in a portion of the exterior circumference of the rotor body and aligned with the balancing weight slot. The balancing weight entry port has a second axial width greater than the first axial width and a second radially outward facing surface at a second radial distance from the axis of the rotor body that is smaller than the first radial distance. A method may include machining the entry port into the rotor with a tool. The method may be applied to a new rotor, or to remove cracks initiating from a previous entry port.

A device for the precise angular positioning of tool-holders includes a front part, a rear part, and a plug cooperating with a pair of pins arranged orthogonally relative to the plug. A first portion of the plug is inserted in a blind hole formed in the front part and a second portion of the plug is inserted in a corresponding blind hole formed in a front area defining a plate on the rear part of the tool-holder. The plate of the rear part has an upper surface in which a pair of bored holes is formed having equal diameters and depths. The bored holes extend vertically in the plate and orthogonally relative to the plug. A pin is rotatably inserted in each of the pair of bored holes to selectively rotate the plug in a clockwise or counter-clockwise direction to orientate the front part relative to the rear part.