An adapter sleeve is described for inserting into an expansion chuck of a cutting device with a substantially cylindrical body that defines a longitudinal axis (L) of the adapter sleeve and a seat area for a cutting tool. The body comprises an axial front end and an axial rear end opposite the front end by means of which the adapter sleeve can be inserted into the expansion chuck of the cutting device. An outlet element is provided at the axial front end through which a coolant can be discharged toward the cutting tool. At least one cooling line extends along the body up to the outlet element and comprises a body line section and an outlet element section. At least one channel-like outlet nozzle is formed in the outlet element and is in fluidic connection with the at least one cooling line. The flow cross-section of the cooling line decreases or remains the same toward the axial front end. In addition, a cutting device is described.

A spindle of a drilling tool includes a socket portion having a first axial length (a1) of a first diameter (d1) for receiving and attaching a drill bit to the spindle. The spindle includes a fluid conduit having a second diameter (d2) narrower than (d1) for conveying a fluid to the socket portion. An interface space with diameter (d1) is formed between the fluid conduit and the drill bit when the drill bit is installed in the socket portion. A fluid conveyor, having a third diameter (d3) narrower than (d1), connects the fluid conduit to the drill bit to avoid fluid gathering in a periphery of the interface space. The fluid conveyor includes a first O-ring abutting a mouth of the fluid conduit, a second O-ring abutting a mouth of a fluid channel of the drill bit, and a spring between the first and second O-rings.

A hydraulic chuck may include an expansion sleeve, a plurality of pistons, and an actuator ring. The expansion sleeve may include a bore. The plurality of pistons may be axially mounted in at least one piston chamber of the expansion sleeve. The actuator ring may be rotatably mounted relative to the expansion sleeve. The actuator ring may be configured to actuate the plurality of pistons in the at least one piston chamber to hydraulically expand the expansion sleeve to provide a varying clamping force within the bore.

A cutter holder has a body, a collet fastening unit, a collet, a cutter, multiple concentricity adjusting units, and multiple straightness adjusting units. The collet fastening unit is assembled on the body. The collet is assembled on the collet fastening unit. The cutter is inserted into the collet. The body has a fastening flange which has multiple concentricity adjusting holes. The multiple concentricity adjusting units are respectively screwed in the multiple concentricity adjusting holes and abut against the collet fastening unit to correct the error of concentricity between the cutter and the body. The collet fastening unit has an assembling flange which has multiple straightness adjusting holes. The multiple straightness adjusting units are respectively screwed in the multiple straightness adjusting holes and abut against the body to correct the error of straightness between the body and the cutter.

A tool holder includes a receiving body, an interface at the rear for receiving the tool holder in a machine tool, a receiving section at the front for the tool, and a coolant bore arranged between the interface and the receiving section and by which coolant is conducted from the interface to the receiving section. The coolant bore has a first region with an adjoining second region. A coolant tube is arranged in the first region of the coolant bore. In the direction of the receiving section, between the coolant tube and the second region of the coolant bore, a cavity is formed in the receiving body or in the first region. A bridging element through which the coolant can flow and which seals the coolant flow in relation to the cavity is arranged in the cavity between the coolant tube and an interface-side end of the second region.

A multi-part modular tool rotatable about a longitudinal tool axis (A), comprising: a machining head; a first holding element comprising a body elongated along the longitudinal axis (A) of the tool, in which a passage extends along the longitudinal axis (A) of the tool; a second holding element which can extend in the passage of the first holding element; wherein the machining head can be connected to the second holding element in such a way that the machining head is fixed firmly to the first holding element at least in the axial direction (A) and/or in the radial direction (R), and wherein the passage of the first holding element and the second holding element are adapted to one another such that during a connection process in which the machining head is connected to the second holding element, the second holding element is movable relative to the first holding element.