A chuck grip accuracy checking method includes a gripping in which the measurement target is gripped on the claws, a moving step, and a measuring step. In the moving step, a movable member provided with a measurement instrument capable of measuring a run-out of the measurement target is moved by driving a movable-member driver to a position at which the measurement instrument can measure a run-out of the measurement target. In the measuring step, a run-out of the measurement target is measured by the measurement instrument, while the chuck is being rotated by driving a rotation driver.

A chuck grip accuracy checking method includes a gripping in which the measurement target is gripped on the claws, a moving step, and a measuring step. In the moving step, a movable member provided with a measurement instrument capable of measuring a run-out of the measurement target is moved by driving a movable-member driver to a position at which the measurement instrument can measure a run-out of the measurement target. In the measuring step, a run-out of the measurement target is measured by the measurement instrument, while the chuck is being rotated by driving a rotation driver.

A tool part attachment assembly for a tool is disclosed. The tool part attachment assembly has a tool part connector and a line. The tool part connector, which is configured for selectively retaining a tool part, has first and second parts and rolling elements disposed radially therebetween. The first part defines a connecting aperture configured to receive a portion of the tool part, is rotationally fixed relative to the tool part when the tool part is received in the connecting aperture, and is disposed inside the second part. The second part is rotationally connected to the first part. The line has a first end connected to the tool part connector, and a second end. In response to the tool part rotating, the first part rotates with the tool part relative to the second part. A tool part connector and a tool assembly are also disclosed.

A chuck includes a chuck surface, a plurality of vacuum ports being distributed over the chuck surface. Each of the vacuum ports is open to a conduit that is connectable to a suction source that is operable to apply suction to that vacuum port. A flow restrictor is located within each conduit and is characterized by a flow resistance. The flow resistance of the flow restrictor in at least one conduit is less than the flow resistance of the flow restrictor in at least one other conduit.

An expander unit of a cryogenic refrigerator device includes a moving assembly with a porous regenerative heat exchanger configured to move back and forth along a longitudinal axis. A magnetic spring assembly includes a stationary magnetic assembly fixed to the cold finger base that includes one or more magnetic rings fixedly arranged about a bore. A movable magnetic assembly includes one or more movable magnetic rings fixed to the moving assembly. An outer lateral dimension of each of the movable magnetic rings is less than an inner lateral dimension of the bore. The stationary magnetic assembly and the movable magnetic assembly are configured such that, when the moving assembly is displaced along the longitudinal axis from an equilibrium position, attractive and repulsive forces between the movable magnetic assembly and the stationary magnetic assembly yield a restoring force that is directed to restore the moving assembly to the equilibrium position.

An upper drill tool including a central chuck, an upper component, a lower component and a coupling assembly. The central chuck has a chuck base and a chuck structurally configured to retain a drill bit. The upper component is attached to the central chuck and has a lower stop surface. The lower component has a central body and an outer ring that threadedly engages the central body, with the outer ring having an upper stop. The coupling assembly is configured to facilitate the slidable movement of the lower component from a first orientation wherein the upper stop is spaced apart from the lower stop surface and a second orientation wherein the upper stop is in abutting engagement with the lower stop surface, with the first orientation and the second orientation defining a stroke.

An axial machining tool includes a cutter holder, a collet, a dust blower nut, and a cutter. The cutter holder has a receiving groove. The collet is extended into the receiving groove and has a containing space. The dust blower nut is sleeved on the collet and has a body, at least one blade, and a positioning element. The body has a threaded hole, a connecting groove, and at least one engaging groove. The threaded hole and the connecting groove are formed in the body and communicate with each other. The at least one engaging groove is formed on the body. The at least one blade is detachably mounted in the at least one engaging groove. The positioning element is mounted to the body and positions the at least one blade on the body. The cutter is extended into the containing space. A dust blower nut is also provided.

A reducing sleeve for fastening a machining tool in a tool holder is described. Said reducing sleeve comprises a reducing sleeve body, which comprises a first tool-side end and a second tool holder-side end. In addition, at least one coolant supply channel is provided in the reducing sleeve body. Furthermore, a multifunctional interface is arranged at the second end and is designed for coupling to a sealing unit and a safety unit. Additionally presented is a modular system for providing a reducing sleeve assembly, which comprises such a reducing sleeve, a sealing unit, and a safety unit. In addition, a machining assembly with a tool holder, a reducing sleeve, and a machining tool is presented.

A chuck grip accuracy checking method includes a gripping in which the measurement target is gripped on the claws, a moving step, and a measuring step. In the moving step, a movable member provided with a measurement instrument capable of measuring a run-out of the measurement target is moved by driving a movable-member driver to a position at which the measurement instrument can measure a run-out of the measurement target. In the measuring step, a run-out of the measurement target is measured by the measurement instrument, while the chuck is being rotated by driving a rotation driver.

A chuck grip accuracy checking method includes a gripping in which the measurement target is gripped on the claws, a moving step, and a measuring step. In the moving step, a movable member provided with a measurement instrument capable of measuring a run-out of the measurement target is moved by driving a movable-member driver to a position at which the measurement instrument can measure a run-out of the measurement target. In the measuring step, a run-out of the measurement target is measured by the measurement instrument, while the chuck is being rotated by driving a rotation driver.