A rotational force transmission mechanism includes a shaft and an engagement member. The shaft is rotatable about a first axis. The shaft includes a leading end portion having a second groove and a first groove which is configured to receive a rotatable portion of a tool holder so that the shaft rotates the rotatable portion about the first axis. The engagement member is movable along the first axis between a first position and a second position and rotatable about the first axis together with the shaft. The engagement member includes an engagement portion configured to be received in the second groove. At least one of the shaft and the engagement member has an inclined surface that moves the engagement portion in a direction toward the first axis when the engagement member moves from the first position to the second position.

A pneumatic-type precision annular workpiece inner positioning surface clamping device, wherein a rod portion of a piston assembly (5) is inserted into a central hole of the wedge-shaped block (12), and the piston portion of the piston assembly (5) is located in a closed chamber of a cylinder body (15); a disc spring (3) is sleeved on the piston assembly (5); an air intake hole (1-1) is provided in the lower plate (1), an air vent hole (15-1) is provided at the upper portion of the cylinder body (15); and an elastic hinge block (6) is sleeved outside the wedge-shaped block (12). The pneumatic-type precision annular workpiece inner positioning surface clamping device has a simple structure, high reliability and strong adaptability.

A handling unit comprises: a collet integrally having a reference part, a plurality of elastic deformation parts connected to the tip side of the reference part, finger parts respectively connected to the tip sides of the elastic deformation parts, and a driven part that receives a driving force; a housing having a cylinder structure formed on the base end side or the outer circumferential side of the collet and provided with a fluid supply port and having a collet locking part that locks the collet at a locking position; and an operation body having a driving part that imparts a driving force to the driven part, a pressure reception part that receives the pressure of a fluid supplied from the fluid supply port, and a cylinder slide contact part that makes slide contact with the internal surface of the cylinder structure.

A method comprises the steps of providing a tool over a collar secured to a stud on a gas turbine engine system. The collet is driven to rotate and remove the collar from the stud. A tool for removing collars from studs has a driver with a housing receiving a piston. A spring drives the piston, and the housing also has a hydraulic fluid supply opening for selectively receiving a hydraulic fluid to move the piston in opposition to a force from the spring. Collet fingers are movable between a released position and a secured position when a supply of hydraulic fluid is supplied into the housing.

An ultrasonic spindle device with automatic tool changer is disclosed. The ultrasonic spindle device includes a housing member having an inner space along a longitudinal direction, a shaft member rotatably disposed in the inner space and having a hollow portion, an ultrasonic oscillation member disposed in the hollow portion and having a through hole, a drawbar member disposed in the hollow portion to move in a front-rear direction, a portion of the drawbar member being inserted into the through hole and passing through the ultrasonic oscillation member, a clamping member connected to a front end of the drawbar member and clamping a tool, a portion of the clamping member being disposed outside the housing member, a rotation means rotating the shaft member, and a cylinder member moving the drawbar member forward or backward along a longitudinal direction of the shaft member.

A toolholder (14) for fastening a chipping tool is specified, having a holding body (22) extending along a holding center axis (20), having a first tool-side end (24) and a second toolholder-side end (26) opposite the first end (24), wherein the holding body (22) comprises at least one coolant supply channel (28) spaced apart from the holding central axis (20), wherein a discharge element (34) is arranged at the second end (26), in which at least one channel-like discharge nozzle (36) is formed, which is fluidly connected to the coolant supply channel (28) and through which coolant can be ejected onto a tool held in the toolholder (14), and wherein a nozzle longitudinal axis (40) extending centrally in the discharge nozzle (36) is inclined to the holding center axis (20) in the radial direction and in the circumferential direction. Furthermore, a cutting apparatus (10) having a toolholder (14) is specified.

A spindle apparatus for use at a machine tool, having: an assembly including a workpiece spindle to receive an elongated workpiece and a motor for driving spindle rotation of the workpiece spindle about a spindle axis; a rotary guide-bush assembly being axially arranged with the workpiece spindle with respect to the spindle axis, the rotary guide-bush assembly receiving the elongated workpiece supported at the rotary guide-bush assembly to rotate about the spindle axis enabling movement of the elongated workpiece; wherein the rotary guide-bush assembly includes a portion to clamp the elongated workpiece, received in the rotary guide-bush and in the workpiece spindle, to transfer driving torque applied from the spindle motor during a driven acceleration of the rotation through the clamped elongated workpiece for rotation of the rotary guide-bush synchronized with the driven acceleration of the rotation of the workpiece spindle.

A clamping device for clamping a workpiece to a machine spindle includes at least one clamping bush which extends around a central axis and has at least one clamping surface for the workpiece and at least one clamping body. The clamping bush on a side remote from the clamping surface at least one support surface which extends about the central axis along a helical line. On a side facing, the clamping bush comprises at least one support surface which extends about the central axis along a helical line with a predefined pitch and is inclined at an angle of inclination to a direction axial to the central axis. The clamping body includes a hydraulic chamber in the interior of the clamping body. The clamping device also includes a displacement element, and at least one pressure generator. A clamping force is generatable between the clamping bush and workpiece.

A handling unit comprises: a collet integrally having a reference part, a plurality of elastic deformation parts connected to the tip side of the reference part, finger parts respectively connected to the tip sides of the elastic deformation parts, and a driven part that receives a driving force; a housing having a cylinder structure formed on the base end side or the outer circumferential side of the collet and provided with a fluid supply port and having a collet locking part that locks the collet at a locking position; and an operation body having a driving part that imparts a driving force to the driven part, a pressure reception part that receives the pressure of a fluid supplied from the fluid supply port, and a cylinder slide contact part that makes slide contact with the internal surface of the cylinder structure.

A spindle apparatus for use at a machine tool, in particular a lathe, has: a spindle assembly including a workpiece spindle to receive an elongated workpiece and a spindle motor for driving spindle rotation; and a rotary guide-bush assembly axially arranged with the workpiece spindle, the rotary guide-bush assembly including a rotary guide-bush to receive the elongated workpiece and supported at the rotary guide-bush assembly to rotate with the elongated workpiece received in the workpiece spindle about the axis while enabling a movement of the elongated workpiece in the axial direction. The spindle and rotary guide-bush assemblies connect to each other by a torque transferring connection, between the spindle and rotary guide-bush assemblies along the axis to transfer driving torque during acceleration or deceleration of the spindle rotation driven by the spindle motor to the rotary guide-bush of the rotary guide-bush assembly.