A machining apparatus capable of drilling a long workpiece from an end surface of a diameter-expanded part and drilling a short workpiece from an end surface of a stem part without inverting orientation of a collet and a sleeve in a chuck device is provided, as well as a method of using the same, and a chuck device for the machining apparatus. A deep hole drilling machine and a chuck device are included with a sleeve and a collet included inside the chuck device, and the collet and the sleeve each have both end openings opened toward the outside of the chuck device. The opening on one end side of each of the sleeve and the collet is directed to the deep hole drilling machine, and the collet is disposed on the other end side of the sleeve.

Clamping device having a receiving opening which is arranged concentrically to a workpiece spindle axis, wherein the clamping device is designed for clamping a gear workpiece comprising a head region and a shaft, the clamping device comprises an annular planar contact surface, which is arranged concentrically to the workpiece spindle axis, is located in a workpiece-side end region of the clamping device, and which extends essentially perpendicular to the workpiece spindle axis, wherein at least one circumferential groove is provided in the workpiece-side end region, which groove extends from an outer surface of the clamping device radially in the direction of the workpiece spindle axis and which provides the clamping device with elasticity in the region of the planar contact surface.

The invention relates to a clamping device for clamping a cylindrical instrument shank, in particular, a dental instrument, the clamping device including a spring-loaded element for holding the instrument shank, a hollow shaft for transmitting a rotational movement, and a plunger, with the spring-loaded element being designed as a sleeve with a cylindrical wall, a first opening and a second opening; and the wall having cut-outs. The spring-loaded element, the shaft and the plunger have axes of rotation that are arranged coaxially; the shaft protrudes at least partially into the first opening of the spring-loaded element; and the plunger protrudes at least partially into the second opening of the spring-loaded element.

A flexible coupling for attaching a collet to a draw bar includes a draw bar having a first longitudinal axis and a first coupling portion. The first coupling portion includes two or more legs spaced apart from one another with each of the legs having first coupling surface formed thereon. The flexible coupling includes a collet having a second longitudinal axis and a clamping portion proximate one end of the collet. The collet includes a second coupling portion proximate a second end of the collet. The second coupling portion has a second coupling surface formed thereon and configured in a shape complementary to the first coupling surface so that the first coupling surfaces moveably engage the second coupling surface such that the first longitudinal axis and the second longitudinal axis are coaxial when an axial force is applied to the draw bar and the collet.

An expanding collet device can selectively clamp a workpiece to a workpiece support and can include an arbor, expandable collet and threaded screw actuator. The threaded screw actuator mechanism can include a support, drawbar, socket and a pair of thrust bearings. The drawbar can be connected to the collet and can extend into the support. An outer circumferential portion of the drawbar can oppose and be spaced away from an inner circumferential portion of the support. The socket can surround the drawbar and can include external threads engaging internal threads on the support such that rotation of the socket relative to the support displaces the socket in the axial direction. The socket, support, and drawbar can be configured such that rotation of the socket relative to the support displaces the drawbar in the axial direction such that the drawbar moves the collet between the released position the clamped position.

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.

The invention discloses a precision fixture for improving the balance precision of a wheel, comprising a chuck, a base, a servo motor, a lower pressure plate, a rubber strip, steel balls, an upper pressure plate, a mounting plate, a connecting shaft, a shaft sleeve, a hydraulic cylinder, a bearing end cover, bearings, a guard, an expanding core, expanding flaps, a flange plate, springs, pins, a flange, a connecting shaft and limiting columns. The fixture can meet the requirement for improving the balance precision of a wheel, at the same time, has the characteristics of simple structure, convenient manufacture, stable performance and precision that can meet the machining requirement, and can meet the requirements of automatic production.

A horizontal lathe for manufacturing a porous optical fiber preform, the horizontal lathe being configured to hold and fix two opposite ends of a target in such a manner that a longitudinal direction of the target is a substantially horizontal direction, and cause the target to be rotated around an axis parallel to the longitudinal direction thereof as a rotation axis. The horizontal lathe includes a thermal expansion absorbing mechanism configured to absorb a change in dimension of the target, the change being due to thermal expansion of the target in a direction of the rotation axis.

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.

A clamping device for the securing of a clamping part is provided. The clamping device includes a stop element and a radial clamping device which define an inner space to partly hold the clamping part. The radial clamping device in a clamped condition exerts a radial securing force on the clamping part. A radial spacing exists between the radial clamping device and a clamping bush radially enclosing the clamping device. The clamping bush and the radial clamping device are radially movable relative to one another, such that the radial clamping device is mounted floating in the clamping bush.