An easily detachable collet has two opposite ends, a conjoint portion, a fastening cap abutting portion, an annular groove, a through hole, and multiple slits. The conjoint portion is arranged at one of the two opposite ends of the collet. The fastening cap abutting portion is annularly formed at the other end of the collet. The fastening cap abutting portion has a convex outline in cross section. The annular groove is formed between the conjoint portion and the fastening cap abutting portion. The through hole is axially defined through the collet. The multiple slits are radially defined in the collet and communicate with the through hole. Each slit extends to one of the two opposite ends of the collet. The fastening cap abutting portion with a convex outline in cross section enables the collet to be smoothly and easily detached from a fastening cap.

A tool holder for collet chucks, wherein a clamping rotor for applying an axial force to a collet chuck is provided. The clamping rotor, including the two axial bearings of the clamping rotor, are accommodated in a tool holder main part, which is connected to a collet chuck receiving body that receives the collet chuck. In order to captively support the clamping rotor in the main part, a bearing seat element is screwed into the main part, said bearing seat element delimiting a receiving chamber for the clamping rotor towards the collet chuck receiving element. Thus, the clamping rotor is enclosed and held in the main part independently of the collet chuck receiving body. This creates new possibilities for the maintenance and adaptation of the tool holder under different conditions, and in particular the force flow emanating from the clamping rotor during a clamping process is kept away from the collet chuck receiving body, thereby improving the precision of the tool holder.

A cutter holder has a body, a fastening bolt, and a vibration absorbing structure. The body has a specific weight. The fastening bolt is mounted inside the body. The vibration absorbing structure is mounted inside the body and has a sleeve, an elastic unit, a spacer, and a set nut. The sleeve is mounted around the fastening bolt and has a specific weight. The specific weight of the sleeve is larger than the specific weight of the body. The elastic unit is mounted around the fastening bolt and has two opposite ends. One of the ends of the elastic unit abuts against the sleeve. The spacer is mounted around the fastening bolt and abuts against the other end of the elastic unit. The set nut is screwed with the fastening bolt and abuts against the spacer.

A tool holder for collet chucks, wherein a-a clamping rotor for applying an axial force to a collet chuck is provided. The clamping rotor, including the two axial bearings of the clamping rotor, are accommodated in a tool holder main part, which is connected to a collet chuck receiving body that receives the collet chuck. In order to captively support the clamping rotor in the main part, a bearing seat element is screwed into the main part, said bearing seat element delimiting a receiving chamber for the clamping rotor towards the collet chuck receiving element. Thus, the clamping rotor is enclosed and held in the main part independently of the collet chuck receiving body. This creates new possibilities for the maintenance and adaptation of the tool holder under different conditions, and in particular the force flow emanating from the clamping rotor during a clamping process is kept away from the collet chuck receiving body, thereby improving the precision of the tool holder.

A collet includes an axially rearward end and an axially forward end; a nose portion; a body portion having an outer surface and an inner surface for engaging a shank of a tool; a plurality of slots extending from the inner surface to the outer surface; and a plurality of coolant channels disposed within the collet between the plurality of longitudinally extending slots and extending entirely from the axially rearward end to the axially forward end of the collet. Slots include a first slot extending from the axial forward end to within an intermediary zone, a second slot extending from the axial rearward end to at least the tool holder engagement zone such that the second slot does not intersect the first slot, and a third slot from within the tool engagement zone to within the intermediary zone such that the third slot circumferentially overlaps the first and second slots.

A machine tool collet carrier includes a collet in a sleeve and a pin fixed to a collet joint that is movable in a sidewall slot of the sleeve.

Provided is a tool chuck that allows precision gripping of a tool by a collet when this collet is pushed into a chuck body. The tool chuck includes a collet for gripping a tool, a chuck body having, at a leading end thereof, a receiving portion for receiving the collet inserted therein along an axis thereof, a holder containing the collet therein and configured to be movable together with the collet along an axial direction based on the axis, and a nut fitted on the chuck body (2) in a radial direction based the axis and containing the holder in the radial direction. The holder has a movement allowing mechanism for allowing the holder to move relative to the nut along the axial direction when the nut is moved relative to the chuck body along the axial direction.

A cutter holder has a holder, a collet, and a nut. The holder has a first threaded portion having an external thread, a first abutting surface, a second abutting surface, at least one recess, and at least one sealing member. The at least one recess is recessed in the second abutting surface. The at least one sealing member is mounted in the at least one recess and partially protrudes from the second abutting surface. The nut has a second threaded portion having an internal thread, a third abutting surface, and a fourth abutting surface. The internal thread and the external thread are corresponding internal and external trapezoidal threads, respectively. The third abutting surface and the first abutting surface have a corresponding diameter with a clearance therebetween being less than 0.015 millimeter. The fourth abutting surface and the at least one sealing member are in an interference fit.

A cutter holder has a holder, a collet, and a nut. The holder has a first threaded portion having an external thread, a first abutting surface, a second abutting surface, at least one recess, and at least one sealing member. The at least one recess is recessed in the second abutting surface. The at least one sealing member is mounted in the at least one recess and partially protrudes from the second abutting surface. The nut has a second threaded portion having an internal thread, a third abutting surface, and a fourth abutting surface. The internal thread and the external thread are corresponding internal and external trapezoidal threads, respectively. The third abutting surface and the first abutting surface have a corresponding diameter with a clearance therebetween being less than 0.015 millimeter. The fourth abutting surface and the at least one sealing member are in an interference fit.

A collet includes an axially rearward end and an axially forward end; a nose portion; a body portion having an outer surface and an inner surface for engaging a shank of a tool; a plurality of slots extending from the inner surface to the outer surface; and a plurality of coolant channels disposed within the collet between the plurality of longitudinally extending slots and extending entirely from the axially rearward end to the axially forward end of the collet. Slots include a first slot extending from the axial forward end to within an intermediary zone, a second slot extending from the axial rearward end to at least the tool holder engagement zone such that the second slot does not intersect the first slot, and a third slot from within the tool engagement zone to within the intermediary zone such that the third slot circumferentially overlaps the first and second slots.