Abstract: 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.

Abstract: A hydraulic expansion chuck for receiving a tool includes a chuck body, an expansion bushing which is received in the chuck body and defines a chuck opening, a pressure chamber which is interposed between the expansion bushing and the chuck body, and a reduction sleeve. The reduction sleeve is received in the chuck opening of the expansion bushing and defines a tool holder receptacle for receiving the tool to be chucked. The reduction sleeve includes a connector element configured to releasably attach the reduction sleeve to the chuck body. The reduction sleeve also may include an adjustment element configured to adjust the axial position of the tool in the tool holder receptacle.

Abstract: A pin-and-collet assembly, a longwall shearer comprising a ranging arm attached to a lifting bracket with such assembly, a method for the secure fastening of one piece to another, such as securely fastening the ranging arm to the lifting bracket of a longwall shearer using such assembly as a bushing, and a method for longwall mining of ore, such as trona, using such longwall shearer. This assembly is easy to install, does not have to be tightened during longwall operation of an ore panel, and is also demountable when it is time to stop the longwall mining operation and time to remove/replace the ranging arm for maintenance and/or when the end of the ore panel is reached.

Abstract: A collet adaptor 20 including a work piece clamp mechanism 29. The collet adaptor 20 is rotatable about a first axis A and the work piece clamp mechanism 29 is mounted within the collet adaptor 20 for rotation with the collect adaptor 20. The clamp mechanism 29 is also mounted for movement laterally to the first axis A during rotation of the collet adaptor 29. The clamp mechanism 29 can also be mounted within the collect adaptor 20 for rotational movement lateral to the first axis A during rotation of the collect adaptor 20.

Abstract: A stepped collet includes a first section of generally hollow cylindrical shape having a first outer diameter and an inner diameter, a wall extending radially inwardly from an outboard end of the first section, and a second section of generally split cylindrical shape cantilevered from the wall and having a second outer diameter smaller than the first outer diameter.

Abstract: The invention relates to a device for clamping a workpiece holder (3) on a collect chuck (2) that can be fixed to a machine tool, having a plurality of clamping elements distributed around the circumference of the collet chuck (2; 42). Said clamping elements that can be adjusted radially to the axis (4) of the collect chuck from a release to a clamping position can be pressed against a circumferential surface (25) of the workpiece holder (3) positioned relative to the collet chuck (2) in the clamping position. The clamping element are designed as rollers (20) having axes (30) aligned nearly tangentially to the collet chuck circumference. A determinable surface pressure thus results in the clamping position as said rollers (20) mutually contact the workpiece holder (3), a clamping mandrel (10) of the collet chuck (2), and the collect chuck part (11). Said surface pressure is thereby reduced and the collet chuck can also be used in the range of greater tensile forces.

Abstract: A temporary securing device for plate-like work pieces includes a split body and an anchor segment, the split body has a resiliently compressible biasing member to allow an outer diameter of the split body to contract allowing passage within a plurality of openings in the work pieces, the split body has an engagement portion near a first end, the engagement portion has an operative surface to engage an outer surface on a first outer work piece, the split body has a second end and a threaded inner support near the second end, the anchor segment is operable to engage an outer surface on a second outer work piece, the anchor segment includes a threaded member to engage the threaded inner support, the threaded member be rotationally operational to draw the split body toward the anchor segment.

Abstract: A wheel pylon includes a tubular mounting shaft that slidably receives a tubular support shaft. A helical spring is disposed within the shafts and a stop, formed from a resilient material, is mounted upon an end of the support shaft. The wheel pylon extends axially to accommodate wheel discs having different axial recess depths.

Abstract: An apparatus and associated method is provided for precisely positioning a datum surface of a component. The apparatus has a housing defining a tooling datum surface. A collet is supported by the housing that is selectively operable between a retracted mode and an expanded mode. In the retracted mode a clearing disengagement is defined with the component. In the expanded mode a contacting engagement with the component is defined. The contacting engagement and a simultaneous longitudinal force transferred by the contacting engagement to the component pressingly engage the datum surfaces together. The apparatus further has a bias member exerting the longitudinal force and urging the collet to the retracted mode.

Abstract: The present invention provides a tool holder interchangeably attached to a machine tool such as a combined machining lathe. A combined machining lathe 1 comprises main spindles 20 and 30 for gripping a workpiece, and a machining main spindle head 50 which rotates around a B axis. There are provided stockers S1 and S2 inside the lathe, and tool holders 200 and 300 are respectively stored in the stockers S1 and S2. The tool holder 200 comprises a taper shank portion 230 of a main shaft in a housing 210 and four pull studs PS2 around the taper shank portion 230 of a main shaft, and is gripped by collet chucks of the machining main spindle head 50. Rotation of the taper shank portion 230 of a main shaft is transmitted to a shaft 250 via a gear mechanism, to drive a drill tool 252 to drill a deep hole.

Abstract: A machine tool arbor for holding a rotating machine part or workpiece is fitted with an actuator member at a back or distal end of an arbor main body for tool-less chucking and unchucking of a machine part or workpiece at a front or proximate end of the arbor main body. An actuator ring or knob is mounted at the back end of the arbor main body which, when rotated in one direction, causes an pusher member (collet pusher part, hydraulic piston) to move in such a manner as to displace a chuck member (inclined collet, flex collet, expansion ring) and release the machine part or workpiece that is chucked. When rotated in the opposite direction, the actuator knob causes the actuator member to move in an opposite manner as to fix the chuck member in a position to firmly hold the machine part or workpiece to be chucked.

Abstract: A tool holder includes a shank including a tool holder portion and a central bore for accommodating a cutting tool, and a first shrink fit sleeve disposed about the tool holder portion of the shank. An application of heat to the tool holder causes the tool holder portion and the first shrink fit sleeve to expand outwardly, and the removal of heat will cause the tool holder portion and the first shrink fit sleeve to contract inwardly to rigidly maintain the cutting tool within the tool holder by shrink fit. The tool holder may also include a second shrink fit sleeve disposed about the first shrink fit sleeve to provide increased torque capability.

Abstract: The present invention relates to a low-vibration tool holder (1) with a tool holder base body (2, 3, 4, 6) and a tensioning arrangement (5) which provides axial tensioning of the tool holder base body (2, 3, 4, 6) and which is simultaneously tensioned in a radially flexible way with respect to the tool holder base body (2, 3, 4, 6). This tool holder (1) is less susceptible to vibration than previously known tool holders, which ensures better true running even during operation and in particular when heat-induced expansion of materials occurs, since the clamping arrangement (5) which is integrated in the tool holder (1) is continuously centered with respect to the tool holder base body (2, 3, 4, 6). Furthermore, such a tool holder (1), in particular within a modular design, can be adapted very flexibly to different types of tools and workpiece machining processes.

Abstract: An interface of a tool is proposed with a first part serving as a seat having a female taper, which part has a first conduit section located concentrically to its center axis, a second part having a hollow shaft taper introduceable into the recess, which part has a second conduit section located concentrically to its center axis, where the center axes of the first and second parts align and having a collet chuck having two chuck jaws which comprises an actuating device coacting with the chuck jaws which can be activated by means of an actuating element. The characteristic feature of the interface is that the actuating device (43) has a caging element (47) which can be shifted to two operating positions and which has a central passage (71) which is located such that the center axes of the first and second parts (3, 5) pass through said passage.

Abstract: A coupling device, particularly for vehicle wheels undergoing surface finishing, comprising elements for the releasable fixing of a wheel to a chuck, which act in holes for the passage of screws for fixing the wheel to a hub of a vehicle.

Abstract: A push-type expandable fixture provided to secure a work-piece to a rotatable machine. An expandable sleeve is inserted within a bore of a hollow work-piece. The work-piece together with the expandable sleeve is disposed about a pair of wedge members which are in turn secured to a first rotatable portion of the machine. The wedge members engage a corresponding tapered internal surface of the expandable sleeve. The second wedge member is longitudinally displaceable relative to the first wedge member and together extends through the work-piece to engage a second rotatable portion of the machine. As the first and second rotatable portions of the machine are brought toward one another, the wedge members act on the tapered surfaces of the sleeve forcing the sleeve to radially expand and firmly grip the work-piece. The arrangement provides the ability to firmly secure a work-piece to a rotatable machine tool by a simple push-type action without the need to induce compression forces on the work-piece.

Abstract: A collet chuck for holding a mounting collar of an object—tool or workpiece—to be rotated has a chuck body centered on and rotatable about an axis and formed with a forwardly open socket shaped to receive the collar. A plurality of jaws in the socket have front ends engageable inside the collar in the socket and rear ends. The jaws are angularly spaced and defining axially extending and radially inwardly open slots. A setting sleeve has a front cam surface engageable with inner faces of the front ends of the jaws so that the sleeve can cam out the front ends to lock the jaws to the collar in the socket. The sleeve is formed with radially outwardly projecting and axially extending ribs each received in a respective one of the slots.

Abstract: A collet chuck for holding a mounting collar of an object to be rotated has a chuck body centered on and rotatable about an axis and formed with an axially forwardly open socket shaped to receive the collar. A plurality of jaws in the socket have front ends engageable inside the collar in the socket and each formed with a radially inwardly directed planar front face. A setting sleeve has a front cam surface formed with respective planar radially outwardly directed front facets engageable with the front faces of the jaws so that the sleeve can cam out the front ends to lock the jaws to the collar in the socket.

Abstract: A collet chuck for holding a mounting collar of an object to be rotated has a chuck body centered on and rotatable about an axis and formed with an axially forwardly open socket shaped to receive the collar. A plurality of jaws in the socket have front ends engageable inside the collar in the socket and each formed with a radially inwardly directed planar front face. A setting sleeve has a front cam surface formed with respective planar radially outwardly directed front facets engageable with the front faces of the jaws so that the sleeve can cam out the front ends to lock the jaws to the collar in the socket.

Abstract: A collet chuck for holding a mounting collar of an object—tool or workpiece—to be rotated has a chuck body centered on and rotatable about an axis and formed with a forwardly open socket shaped to receive the collar. A plurality of jaws in the socket have front ends engageable inside the collar in the socket and rear ends. The jaws are angularly spaced and defining axially extending and radially inwardly open slots. A setting sleeve has a front cam surface engageable with inner faces of the front ends of the jaws so that the sleeve can cam out the front ends to lock the jaws to the collar in the socket. The sleeve is formed with radially outwardly projecting and axially extending ribs each received in a respective one of the slots.