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 collet to feed and fasten cylindrical rivets includes an inlet unit that accepts and supports the rivet, a first feeding unit connected from the inlet unit and configured to feed the rivet, a second feeding unit connected to the first feeding unit opposite to the inlet unit and configured to feed the rivet, and an outlet unit that is connected to the second feeding unit opposite to the first feeding unit and supports the rivet that is fed to it. The inlet unit and the first feeding unit have at least two first slots at opposite angles, the second feeding unit and the outlet unit have more of second slots than the first slots, and when the rivet enters the first feeding unit, the second slots are closed by the opening of the first slots.

A clamping assembly includes a collet adapter and an expansion sleeve movably disposed in collet adapter and a draw pin movably disposed in the expansion sleeve. The expansion sleeve cooperates with the draw pin to define a containment system configured maintain the expansion sleeve within an axial envelope and a radial envelope within the collet adapter. Axial movement of the draw pin in the expansion sleeve within the axial envelope causes a portion of the expansion sleeve to expand radially outward to a predetermined maximum diameter to releasably clamp the collet in the collet adapter.

A collet to feed and fasten cylindrical rivets includes an inlet unit that accepts and supports the rivet, a first feeding unit connected from the inlet unit and configured to feed the rivet, a second feeding unit connected to the first feeding unit opposite to the inlet unit and configured to feed the rivet, and an outlet unit that is connected to the second feeding unit opposite to the first feeding unit and supports the rivet that is fed to it. The inlet unit and the first feeding unit have at least two first slots at opposite angles, the second feeding unit and the outlet unit have more of second slots than the first slots , and when the rivet enters the first feeding unit, the second slots are closed by the opening of the first slots.

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 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 coolant collet assembly has a collet body and a cutter. The collet body has an outer end, an inner end, an annular groove, multiple external slits, multiple internal slits, and multiple coolant channels. The external slits and the internal slits are in a staggered arrangement. Each coolant channel is defined longitudinally in the collet body around the cutter hole, is converged radially toward the outer end, and has an end communicating with a respective one of the internal slits and an opening formed in the outer end. The cutter is inserted in the cutter hole. The coolant may flow through the coolant channels of the collet body and is guided to the heating point of the working cutter with the converged coolant channels.

A coolant collet assembly has a collet body and a cutter. The collet body has an outer end, an inner end, an annular groove, multiple external slits, multiple internal slits, and multiple coolant channels. The external slits and the internal slits are in a staggered arrangement. Each coolant channel is defined longitudinally in the collet body around the cutter hole, is converged radially toward the outer end, and has an end communicating with a respective one of the internal slits and an opening formed in the outer end. The cutter is inserted in the cutter hole. The coolant may flow through the coolant channels of the collet body and is guided to the heating point of the working cutter with the converged coolant channels.

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.