A replaceable cutting head includes a forward cutting portion and a rearward mounting portion. The mounting portion includes a male coupling member that protrudes rearwardly from a head base surface. The male coupling member includes forward and rearward bearing portions and an external thread located therebetween. The forward and rearward bearing portions include respective conically shaped forward and rearward head abutment surface. The forward and rearward head abutment surfaces have the same cone angle. When a cutting tool, including said cutting head and a tool holder having a female coupling member, is in a locked position, the external thread is threadingly engaged in the female coupling member and the forward and rearward head abutment surfaces conically abut corresponding conical shaped surfaces in the female coupling member.

An indexable thread forming tap including: a body in a shaft shape; and a tip concentrically and detachably attached to a leading end portion of the body by screw-fastening and rotationally driven around an axial center along with the body for rolling of a female thread, the body being disposed with a screw hole concentrically to the axial center such that a screw shaft disposed on the tip concentrically to the axial center is screwed into the screw hole for the screw-fastening, a leading end surface of the screw shaft being pressed against a bottom surface of the screw hole into close contact with each other by the screw-fastening to integrally fix the tip to the body without the leading end of the body abutting on the tip, the body being disposed with a restraining hole concentrically to the axial center.

An indexable thread forming tap including: a body in a shaft shape; and a tip concentrically and detachably attached to a leading end portion of the body by screw-fastening and rotationally driven around an axial center along with the body for rolling of a female thread, the body being disposed with a screw hole concentrically to the axial center such that a screw shaft disposed on the tip concentrically to the axial center is screwed into the screw hole for the screw-fastening, a leading end surface of the screw shaft being pressed against a bottom surface of the screw hole into close contact with each other by the screw-fastening to integrally fix the tip to the body without the leading end of the body abutting on the tip, the body being disposed with a restraining hole concentrically to the axial center.

A tool holder has a holder body, a chuck, and a clamping nut. The chuck has an annular groove, a nut positioning portion, and a cutting surface. The cutting surface is formed on a periphery of the nut positioning portion by cutting. The clamping nut has a protruding edge. When assembling the chuck and the clamping nut, the cutting surface allows the protruding edge to easily avoid and pass by the nut positioning portion, enter the annular groove, and be engaged in the annular groove, which lowers difficulty of assembly. During disassembly, the protruding edge is configured to abut the nut positioning portion, which allows the chuck to be easily detached from the holder body together with the clamping nut when unscrewing the clamping nut from the holder body.

The present disclosure relates to a tool holding arrangement (1, 1, 1) comprising a rotatable shaft (2, 2, 2) which is at least connectable to a tool driving power source (3) and comprises a first shaft thread (4, 4). The tool holding arrangement (1, 1, 1) comprises a thread insert (5, 5) that comprises a first insert thread (6, 6), adapted to engage the first shaft thread (4, 4) so as to form a first thread arrangement (4, 6; 4, 6). The thread insert (5, 5) comprises a second insert thread (7) that is adapted to engage a tool thread (8) of a tool holding device (9) that is arranged to be 2 screwed onto the second insert thread (7) so as to form a second thread arrangement (7, 8), the first thread arrangement (4, 6; 4, 6) having a higher pitch than the second thread arrangement (7, 8).

The present disclosure relates to a tool holding arrangement (1, 1, 1) comprising a rotatable shaft (2, 2, 2) which is at least connectable to a tool driving power source (3) and comprises a first shaft thread (4, 4). The tool holding arrangement (1, 1, 1) comprises a thread insert (5, 5) that comprises a first insert thread (6, 6), adapted to engage the first shaft thread (4, 4) so as to form a first thread arrangement (4, 6; 4, 6). The thread insert (5, 5) comprises a second insert thread (7) that is adapted to engage a tool thread (8) of a tool holding device (9) that is arranged to be 2 screwed onto the second insert thread (7) so as to form a second thread arrangement (7, 8), the first thread arrangement (4, 6; 4, 6) having a higher pitch than the second thread arrangement (7, 8).

Tool adapter assemblies are presented including: a quick release coupler including: a spindle defining a partial cylindrical cavity, the spindle including a base portion, a body portion, and an end portion where the body portion includes a number of ball stop recesses; a number of ball stops slidingly engaged with the number of ball stop recesses; and a sleeve slidingly coupled with the spindle, where the sleeve is configured to lock and release the ball stops; and an accessory connector including at least one of: one or more annular grooves configured to engage with number of ball stops, a number of detents configured to engage with number of ball stops; and an accessory engagement portion positioned along a proximal end of the accessory connector.

Tool adapter assemblies are presented including: a quick release coupler including: a spindle defining a partial cylindrical cavity, the spindle including a base portion, a body portion, and an end portion where the body portion includes a number of ball stop recesses; a number of ball stops slidingly engaged with the number of ball stop recesses; and a sleeve slidingly coupled with the spindle, where the sleeve is configured to lock and release the ball stops; and an accessory connector including at least one of: one or more annular grooves configured to engage with number of ball stops, a number of detents configured to engage with number of ball stops; and an accessory engagement portion positioned along a proximal end of the accessory connector.

A method for tightening or releasing a screw connection between a core drilling device and a core bit, the core drilling device including a core bit and a motor, the core bit being able to be caused to move in a first direction of rotation while, by activation of the motor during the tool change, a counter-torque is generated in order to tighten or release the twist lock between the core drilling device and the core bit. A core drilling device for carrying out the method. By activation of the motor of the core drilling device, the motor can be caused to operate counter to the movement of the core bit in the first direction of rotation. As a result, a difference between the torque in the first direction of rotation and the counter-torque can be significantly increased by activation of the motor.

A method for tightening or releasing a screw connection between a core drilling device and a core bit, the core drilling device including a core bit and a motor, the core bit being able to be caused to move in a first direction of rotation while, by activation of the motor during the tool change, a counter-torque is generated in order to tighten or release the twist lock between the core drilling device and the core bit. A core drilling device for carrying out the method. By activation of the motor of the core drilling device, the motor can be caused to operate counter to the movement of the core bit in the first direction of rotation. As a result, a difference between the torque in the first direction of rotation and the counter-torque can be significantly increased by activation of the motor.