Abstract: A protective device for spraying of a wheel is mainly composed of a support, a cylinder, a push plate, bases, floating shafts, shaft sleeves, stop screws, copper sleeves, rotatable pins, springs, elastic collars, end covers, flange plates, guards and a mandrel, wherein the bases and the cylinder are fixed on the support, a flange plate is fixed on each base, an output shaft of the cylinder is connected with the push plate, a copper sleeve is enclosed in each base via an elastic collar, an end cover encloses a spring and a floating shaft inside a shaft sleeve, and the spring is connected with the floating shaft and an end cover respectively.

Abstract: Disclosed is a secondary clamping device for a wheel. Two bearings and a spacing ring are closed in a base by a bearing end cover, a shaft sleeve is mounted on the bearings, a linear bearing and a gland are fixed on the shaft sleeve, a positioning pin is fixed at the top of the floating shaft, two ends of the spring A are respectively connected with the positioning pin and the linear bearing, and the positioning pin can move up and down under the action of the spring A. A pull rod is fixed on the gland, the outer wall of the floating column is connected with the inner hole of the shaft sleeve, two ends of the spring B are respectively connected with the gland and the floating column.

Abstract: The invention relates to a compensation device for the flat-compensated clamping of a workpiece, in particular a toothed workpiece or a workpiece to be toothed, carried out via a clamping device defining a clamping axis, said workpiece having an axis of rotation and abutting a contact surface of the compensation device with a flat side, wherein the workpiece axis of rotation is coaxially centered to the clamping axis when the clamping device is actuated, and any deviations arising therefrom of the abutting flat side from an orthogonality to the workpiece axis of rotation are compensated by a deflection movement carried out at the compensation device, wherein the contact surface has at least three contact areas spaced apart from one another and the deflection movement comprises an axial movement of the contact areas.

Abstract: An assembly for tightening and securing includes a first male part and a second female part fitted together, which have complementary forms. The fitting includes at least one contact surface of the first part with the second part. The assembly also includes at least one annular means mounted on the periphery of one of the two parts. The annular means is connected in a translational manner to the part on which the annular means is mounted when the annular means abuts with the part on which the means is mounted, and arranged to interact with a peripheral surface of the complementary part during a rotation of the annular means in relation to the complementary part.

Abstract: Damping elements for tool chucking systems for damping vibrations and shocks that occur during machining in the case of force-fitting clamping of tools in a tool receptacle or on the tool itself. At least one damping element consisting of a shape memory alloy having a mechanical effect is provided in a tool chucking system or on the tool itself, such that the damping element provided in the chucked state in the force flow of the chucked elements is present in a reversible and hysteresis-dependent state by way of a mechanical force action and the associated crystalline conversion via the pretensioning of said damping element and leads to dissipation of mechanical energy. The mechanical energy to be damped is a cyclical vibration or represents a non-cyclical overload which is transmitted in the form of shocks.

Abstract: 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.

Abstract: A positioning assembly for positioning a rotary part to be machined includes a machining fixture and a positioning device having an elastically-deformable diaphragm concentrically mounted to the fixture and defining an annular loading zone which receives an axial force substantially parallel with a center axis of the fixture. The positioning device has circumferentially-spaced engaging segments, fixed to the diaphragm and extending away therefrom, which have contact members that are displaced radially to frictionally engage the rotary part when the axial force is applied to the loading zone of the diaphragm.

Abstract: A tool holder has a body with a spindle side for fastening the tool holder to a spindle of a machine tool and a tool side for accommodating a tool and has a lubricating media passage from the spindle side to the tool side that contains a lubricating media bush adjustable in the axial direction in the body. The lubricating media bush opens out on the tool side of the body, wherein a guide for the lubricating media hush is provided in the body. The guide contains a fitting section in which the lubricating media bush is adjustably guided, wherein a seal is provided which seals the lubricating media bush relative to the body.

Abstract: A quick-release bit adapter includes a body having a driving hole extending from a driving section towards a connecting section of the body. The driving section includes a sliding hole extending at a non-parallel angle to and in communication with the driving hole. A resilient positioning member is mounted in the driving section. A releasing device is slideably mounted in the sliding hole. When the releasing device is in a first position, the resilient positioning member is engaged in cuts in an outer periphery of a bit in an engagement position received in the driving hole. When the releasing device is moved to a second position, the bit is disengaged from the resilient positioning member to allow easy removal of the bit.

Abstract: The invention relates to an adjusting device for axially supporting a shank tool in a shrink-fit chuck tool holder, comprising a leveling section on the side facing the shank tool to level out or at least reduce any changes in position and/or orientation of the shank tool which are due to shrinkage.

Abstract: The invention relates to a tool holder (1) for clamping tools by shrink fit. The tool holder, due to its specific shaping in the area of the shrink-fit head (6) and the shrink-fit base (5) of the tool holder, is less prone to oscillate than known tool holders, therefore allowing inter alia higher speeds so that the cutting capacity, determined by the speed of the tool, the tool feed and the cutting depth of the tool, can be increased and the machine running times required to produce a workpiece can be reduced. The tool holder (1) of the present invention allows to produce and machine workpieces in a substantially more efficient and economical manner.

Abstract: A fixture for facilitating the accurate and repeatable preset of chamfering tool cutting inserts to proper height and angle specifications. The fixture may include an upright main body with a removable insert for receiving an end of a chamfering tool of interest. The insert may include several raised support pads for supporting the chamfering tool in an elevated position. The fixture may also employ chamfering tool clamping mechanisms to securely clamp the chamfering tool to the fixture. The clamping mechanisms may include a feature that allows for proper clamping pressure to be exerted on a given chamfering tool even if a flange portion thereof is somewhat thicker or thinner than expected. One or more locating pins or other locating elements may also be employed to ensure repeatable location of a chamfering tool to the fixture.

Abstract: The description shows a collet chuck 303 for clamping a tool for the purpose of machining a workpiece, comprising: a cutout for receiving a collet 301, wherein the collet chuck 303 has a cutting edge 306 for machining the workpiece.

Abstract: A system is disclosed for the rapid change of heads in operating machines, such as equipment for the cut and/or decoration of passe-partout, or of items made of cardboard, glass, ceramic or the like. A system according to the present invention couples the head of the machine with a machine arm through a connecting element that contains one or more magnets. Said magnets retain the head connected to the connecting device by attraction, but also allow the head to be easily removed with just one hand.

Abstract: A tool holder for a cutting tool having a tool shank includes a receptacle which extends in an axial direction and a sleeve disposed in the receptacle. The sleeve includes a tool receptacle structured to at least partially receive the tool shank and a blocking element that projects radially into the tool receptacle. The axial positioning of the sleeve is adjustable with respect to the receptacle.

Abstract: The invention relates to an adjusting device for axially supporting a shank tool in a shrink-fit chuck tool holder, comprising a leveling section on the side facing the shank tool to level out or at least reduce any changes in position and/or orientation of the shank tool which are due to shrinkage.

Abstract: An effective technique is provided for rationally clamping and holding various kinds of tool bits which can be selectively replaced with each other and attached to the driving shaft, in a power tool The power tool includes a driving shaft 125 for driving a tool bit 109A or 109B which is arbitrarily selected from various kinds of tool bits, a first clamping element 133 provided on the driving shaft 125 and a second clamping element 135A, 135B provided separately from the driving shaft 125 and can be fixed to the driving shaft 125. The selected tool bit 109A, 109B is clamped and held between the first clamping element 133 and the second clamping element 135A, 135B.

Abstract: A hydraulic expansion chuck for chucking a tool such as a boring tool, a milling cutter, or other cutting tool. The hydraulic expansion chuck has an expansion bushing which can be deformed radially under the action of a pressure fluid contained in a pressure chamber to chuck a tool. Pressure is transmitted to the pressure chamber from a pressure generating unit via an annular gap positioned about the chuck axis.

Abstract: A workpiece ejecting device for a machine tool, in which the ejecting bar cannot be rotatably driven at the time of high velocity rotation of the spindle to thereby prevent occurrence of vibration, noise and frictional heat, and so that the workpiece can be ejected smoothly. The workpiece ejecting device comprises: a front bearing unit installed at an inner peripheral surface of a front end portion of the drawing tube; an ejecting cylinder located behind the chucking cylinder and installed directly on an axial line identical with that of the front bearing unit, and an ejecting rod, wherein the ejecting rod is provided at a center axis thereof with at least one fluid passing opening through which fluid for removing alien materials is supplied, and a front end of the ejecting rod is installed to be supported by the front bearing unit.

Abstract: A method for positioning a tool (24) on a tool chuck (20) employs a tool holding device (22, 50, 58), which includes a tool-accommodating area (32, 52, 66) for at least partly receiving the tool (24), a connecting area (26, 54 62) to be arranged on the tool chuck (20), and a positioning opening (48) through which a positioner (18) can be placed against the tool (24), which is located at least in part in the tool-accommodating area (32, 52, 66). The tool (24) is optically scanned to obtain a measurement. Subsequently, the tool holding device (22, 50, 58) is removed from the chuck (20), and the chuck is heated. Then, the tool (24), which is separated from the tool holding device (22, 50, 58), is shrink fitted in the chuck (20) at a position that is based on the measurement.

Abstract: The invention relates to a method for fixing a tool (10, 22, 64), especially a shaft tool, in a clamping chuck (8, 18, 60), whereby the tool (10, 22, 64) is introduced into the clamping chuck (8, 18, 60) and fixed therein (8, 18, 60) upon reaching an axial nominal position. According to the invention, the tool (10, 22, 64) is brought against an abutment (42, 70) and the position of a characteristic element of the tool (10, 22, 64) is measured. The tool (10, 22, 64) is positioned in the axial nominal position by moving the abutment (42, 70) along a positioning section (Z1) calculated from the measurement.

Abstract: A chuck has a generally cylindrical body member having a nose section and a tail section. The tail section is configured to mate with the drive shaft so that the body rotates with the drive shaft. The nose section has an axial bore formed therein and a plurality of jaws is slidably positioned to engage a bit within the axial bore. Each of the jaws has a bit engaging jaw face formed thereon. One or more centering members are disposed adjacent to the jaws. The members are deformable from a first position where the members define a through passage configured to accept a bit, which has a drive shaft diameter less than a predefined diameter. The members are further configured to be deformable to a second position upon the insertion of a bit, which has a diameter greater than the predefined diameter, into the axial bore.

Abstract: A plunger with interchangeable handle system for machine tools. The plunger includes a shank adapted to engage a machine tool and having a retractable plunger and a threaded adapter, the interchangeable handle system includes a plurality of knobs, each having a discrete shape differing from the others and a socket to receive the threaded adapter of the shank.

Abstract: A collet chuck for retaining a thread cutting tool with a sleeve is axially movable in the interior and has a mechanism for retaining the thread cutting tool. To shorten the tool changing times it is provided that the mechanism for retaining the tool is an axially movable quick-change sleeve guided in the collet chuck or in the sleeve, which quick-change sleeve is developed such that it is stayed via a spring, axially with respect to the sleeve and a clamping body for clamping a tool is provided.

Abstract: The invention relates to a chuck (2) for retaining fixing elements (1) that are provided with a respective radial contact surface and a follower profile (17) for a friction welded connection on a component and for transmitting the rotational and contact forces that act on a fixing element. An annular receiving element (9) is provided in the chuck (2) for transmitting the rotational force, said receiving element tightly surrounding the fixing element comprising an axial polygonal profile that has been introduced. The chuck comprises a retractable contact part (18, 27) in the annular receiving element (9), which is guided in said element and which can be retracted in said element to permit the entry of a fixing element through a lateral opening (12) in the receiving element, the part being retracted behind said opening.

Abstract: A method of processing a vehicle wheel/rim preform with a centersection/spider and an annular wall extending around a first rotational axis and having an annular surface defining axially spaced, annular inboard and outboard bead seats. The method includes the steps of: providing a workpiece support having a chuck assembly that is rotatable around a second axis and at least one rim wall support assembly; engaging the chuck assembly with the centersection/spider to maintain the vehicle wheel/rim preform in a processing position; engaging the at least one rim wall support assembly with the annular wall to exert thereon a force with a radial component to thereby stabilize the wheel/rim preform; and processing the vehicle wheel/rim preform at the annular surface fully axially between the inboard and outboard bead seats.

Abstract: An adapter for holding a workpiece to be machined in an accurately located axial position can include a main sleeve having an interior wall defining a passage extending therethrough with at least one inner surface angled inwardly toward a centerline of the passage, a workpiece locator engageable within the passage and supporting a positive axial location stop, an axially and radially moveable collet interposed between the main sleeve and a workpiece to be processed, and a rotatable sleeve engageable with the collet for accurately locating the workpiece to be processed by radially grasping the workpiece to be processed and axially moving the workpiece into engagement with the positive axial location stop.

Abstract: A tool bit stop located on an inner surface of a clamping jaw of a drill chuck. The tool bit stop is located a distance from a jaw gripping surface of the clamping jaw. The tool bit stop is adapted to provide a surface to register an end of a tool bit in a consistent location relative to the jaw gripping surface. The tool bit stop is shaped to allow advancement and retraction of the clamping jaws without interference from the tool bit stop.

Abstract: A drill includes a chuck which has a body member including a bore to receive a tool. Jaw members frictionally engage the tool to retain the tool in the chuck. A member is associated with the jaw members and the body to move the jaw members between clamping and non-clamping position. A centering mechanism extends radially into the body member to center tool bits within the chuck while prohibiting the tool bit from contacting the bore wall.

Abstract: A router bit with a position stop is disclosed. The router bit includes a body with a collar extending outwardly from it and a shaft extending outwardly from the collar. At least one cutter blade is mounted to the body and the cutter blade may be used to cut a profile into a workpiece. The collar has a first diameter, the shaft has a second diameter and the first diameter is larger than the second diameter. The collar has a face formed a spaced distance or height from the transition point between the collar and the body. The face rests against the upper surface of a chuck when the shaft is secured in the chuck. This allows the body and hence the cutter blades to be held a predetermined distance above the upper surface of the chuck. A second router bit may be provided to cut a complimentary second profile in a second workpiece.

Abstract: The invention relates to a clamping chuck for a tool comprising a device for supplying a cooling agent and/or lubricants to a feeding channel of the tool maintained by the clamping chuck. The clamping chuck comprises a sleeve for coupling a feed pipe for supplying a cooling agent and/or lubricants, the sleeve provided with a tubular element and an adjusting screw which is arranged in such a way that it is displaceable with respect to the clamping chuck in the direction of the longitudinal axis thereof.

Abstract: The invention relates to a tool holder (10) for shrink-fit attachment of rotating tools (11) with predominantly cylindrical shafts (12), having a chuck (13) with a clamping section (14) containing a conical receiving bore (15) to accommodate an insert (30) that has a cylindrical bore (32) to accommodate the tool shaft (12) and has a conical outer surface (31 ) to be contained in the receiving bore (15) of the clamping section (14). The insert (30) is embodied so that after the axial insertion of the insert (30) into the hot chuck (13), a contact is produced between the insert (30) and the chuck (13) on the one hand and between the insert (30) and the inserted tool shaft (12) on the other hand and, when the chuck (13) cools, the tool shaft (12) is clamped, wherein it is possible to bridge over large diameter tolerances while achieving maximum clamping forces (FIG. 1).

Abstract: A rapid detached connecting device comprises a rod body having an engaging portion; the rod body having a hollow body; an engaging block installed within the rod body; the engaging block having a stop block; a buckling unit inserted into the engaging portion for limiting the movement of the engaging block; an elastomer resisting against the engaging block so as to move toward a front end of the engaging portion; and an opener head having an guide tapered end and an annular groove; the guide tapered end having a shape corresponding to the stop block of the engaging block. When the opener head is inserted into the engaging portion of the rod body; a distal end of the opener head will press the engaging block so that the engaging block moves; and the stop block capable to adhere to the guide tapered end.

Abstract: A tool for beveling the end of a pipe is comprised of a hollow, tubular body having a central, longitudinal axis of rotation, an inboard coupling end, and an opposite outboard working end. A plurality of longitudinally spaced, transversely directed latching pin bores of equal size are defined through the wall of the tubular body. A core member is disposed coaxially within the tubular body. The core member includes a beveling cutter head and a longitudinal stem having a radially inwardly directed, circumferential latch position groove. A transversely oriented latching pin is engaged in a selected one of the latching pin bores in the body and with the latch position groove of the core stem. This allows alternative selection of each of the latch position bores for insertion of the latching pin. The particular bore selected determines the longitudinal position of the core stem latch position groove within the body that will be aligned with the latching pin.

Abstract: A key cutting machine for the cutting of keys includes a spindle adapted to be driven rotatably about an axis thereof. The spindle has an axially extending throughbore. A milling cutter is selectively mountable in the throughbore for corotation therewith. A carriage for supporting a clamp assembly is movable relative to the spindle in a plane that is orthogonal relative to the axis. A key blank is clamped in the clamp assembly for cutting by the milling cutter. A securing mechanism is disposed on the spindle for rigidly mounting the milling cutter to the spindle when the milling cutter is positioned adjacent a first spindle end. A stem is selectively receivable in the throughbore by axial insertion into a second spindle end to position the milling cutter adjacent the first spindle end. The stem is removable from the throughbore after the milling cutter is rigidly mounted to the spindle by the securing mechanism.

Abstract: A router bit with a position stop is disclosed. The router bit includes a body with a collar extending outwardly from it and a shaft extending outwardly from the collar. At least one cutter blade is mounted to the body and the cutter blade may be used to cut a profile into a workpiece. The collar has a first diameter, the shaft has a second diameter and the first diameter is larger than the second diameter. The collar has a face formed a spaced distance or height from the transition point between the collar and the body. The face rests against the upper surface of a chuck when the shaft is secured in the chuck. This allows the body and hence the cutter blades to be held a predetermined distance above the upper surface of the chuck. A second router bit may be provided to cut a complimentary second profile in a second workpiece.

Abstract: Device for coupling in a reproducible position two coupling elements, comprising a first coupling element (2) and a centering plate (4), the centering plate (4) being designed to be fastened to a second coupling element (3), the first coupling element (2) comprising at least one peg (21) comprising at least one spherical portion, the centering plate (4) comprising at least one hollow portion (41) working with the peg (21) during the coupling of said second coupling element (3) to said first coupling element (2) so as to determine the position of said centering plate (4) relative to said first coupling element (2), and equipment for pre-adjusting machine tools comprising this device.

Abstract: There is provided a locator device and an associated fixture and method for supporting a rotatable member. The locator device has a base and a plurality of flanges extending from the base in an axial direction and arranged circumferentially to define an aperture for at least partially receiving the rotatable member axially. The flanges defining slots for receiving radial portions of the rotatable member with the radial portions extending radially outward from the flanges. Thus, the locator device can support boreless rotatable members so that a tool can be supported against the radial portions of the rotatable member to thereby form the rotatable member to predetermined dimensions.

Abstract: A laser-based jaw setting device for an accurate work holding jaw placement on a lathe, wherein the laser-based jaw setting device has a housing with a laser diode, an internal battery supply, and an operating switch mounted therein; and further having a main mounting plate secured to housing in order to releasably secure the laser-based jaw setting device to the desired lathe, especially a computer numeric controlled lathe.

Abstract: A chuck for an annular core bit (1) having an inner thread (2) includes a motor-driven rotatable spindle (4) having a threaded support (5) cooperating with the inner thread (2) for supporting the annular core bit (1), a stop member (7) associated with the axial stop flange (6) provided on the work spindle (4), locking wedge elements (9) for axially connecting the stop member (7) with the axial stop flange (6) under compressive strain, and a manually actuatable, displaceable release member (10) for displacing the locking wedge elements (9) between a position in which the locking wedge means (9) axially connects the stop member (7) and the axial stop flange (6) under compressive strain, and a position in which the stop member (7) is axially displaceable relative to the axial stop flange (6).

Abstract: A chuck for a rotary-percussion power tool (2) and including a working tool guide (3) for receiving a shank (5) of a working tool, at least one locking member (4) for limiting an axial displacement of the shank (5) within an axial displacement length (X) from opposite sides, and a displaceable, spring-biased stop member (7) cooperating, within the shank displacement length (X), with a power tool side, stop surface (8) of the shank (5).

Abstract: A machinable datum for use in a vacuum fixture is disclosed.

Abstract: A clamping sleeve/tensioning device comprises a clamping sleeve that is positioned inside a conical centering opening of a housing body. A chucking mechanism with rotational body is used to tighten or release the clamping sleeve. The rotational body is provided with a central opening, having an internal thread or an external thread, which directly engages in the clamping sleeve. The rotational body preferably is supported via a roller bearing on a corresponding bearing surface of the housing body. The rotational body is driven via a reducing gear, for example via a worm. As a result, high tensioning forces can be generated in connection with the relatively small diameter of the tensioning thread and the small conical angle. The small diameter of the tensioning thread ensures a low thread friction.

Abstract: A tool receiver or chuck is provided which may receive a cutting tool, such as a router bit or the like, therewithin and non-rotatably retain the tool relative to a rotary driving device. The tool receiver includes a plurality of blades substantially encased within a conical surface. A biasing member biases the blades toward a narrow end of the conical surface such that the blades are biased in a tool engaging or operative position. The biasing member and conical surface thus bias the blades radially inward toward the cutting tool such that the blades engage the conical surface and the cutting tool. The tool receiver preferably includes a retaining member, which retains the blades within the conical surface and biases the blades radially outwardly toward the conical surface.

Abstract: A holding chuck has a clamping device for firmly holding the tire-wheel in the position aligned with a center axis of a holding chuck. Chatter-suppressing dampers are disposed on an intermediate plate fitted around the chuck. The dampers are disposed on circles concentric with the center axis of the holding chuck. Each of the dampers has a damping rod extending in the direction parallel to the center axis and abutting a rim of the wheel. A damper cover is disposed between the rim of the wheel and the dampers and fastened to the holding chuck. The damper cover has slot holes disposed on a circle concentric with the center axis of the chuck which allow the damping rods of the dampers disposed on only one of the concentric circles to extend therethrough and abut the rim of the wheel.

Abstract: A tool assembly (10) comprising a male member (12) and a female member (14). The male member having a diameter D1 and being inserted into a variable diameter bore (28) in the front end of the female member (14). The variable diameter bore having a front end having a diameter D2 and a rear end having a diameter D3. In a non-assembled state of the tool assembly, D3 is greater than D2, and D1 is greater than D2 and greater than D3.

Abstract: A clamping sleeve/tensioning device comprises a clamping sleeve that is positioned inside a conical centering opening of a housing body. A chucking mechanism with rotational body is used to tighten or release the clamping sleeve. The rotational body is provided with a central opening, having an internal thread or an external thread, which directly engages in the clamping sleeve. The rotational body preferably is supported via a roller bearing on a corresponding bearing surface of the housing body. The rotational body is driven via a reducing gear, for example via a worm. As a result, high tensioning forces can be generated in connection with the relatively small diameter of the tensioning thread and the small conical angle. The small diameter of the tensioning thread ensures a low thread friction.

Abstract: A tool holder is disclosed for a rotary tool having an elongated cylindrical shank. The tool holder includes an HSK body having a cylindrical bore with a predetermined inside diameter. An elongated cylindrical insert has a throughbore or collet pocket and the insert has an outer diameter larger than the inside diameter of the body cylindrical bore. Thus, the insert is insertable into the body cylindrical bore only when the body front nose is heated to a predetermined temperature at which temperature the body thermally expands to an extent that the inside diameter of the body bore is greater than the outer diameter of the insert. Upon subsequent cooling of the body, the body and insert are attached together. A collet is then used to removably and coaxially secure the tool shank to the insert within the insert throughbore. Other inserts may be used such as floating style holders, straight bore, etc.

Abstract: The apparatus for clamping a work piece in a well defined position within the operating area of a machine tool comprises a chuck member to be mounted within the operating area of the machine tool and a work piece carrier that can be put onto the chuck member and clamped thereto. First positioning members provided on the chuck member and second positioning members provided on the work piece carrier cooperate to define the position of the work piece carrier along three coordinate axes each running perpendicular to each other as well as with regard to the angular orientation. A clamping mechanism fixes the work piece carrier member to the chuck member in the afore mentioned defined position. In order to ensure an increased resistance against tilting momenta and torque occurring during the machining of a work piece, the clamping mechanism comprises a plurality of clamping devices.

Abstract: Described is a coupling, provided at the spindle head of a machine tool, for clamping an especially plate-shaped work-holding fixture, for example a pallet, in a specified, repeatable and precise position relative to a spatial reference system, wherein the spindle head exhibits a collet, which can be moved axially and radially with respect to its face. To increase the accuracy when machining a workpiece, there is a plate, which is to be connected to the face and is provided with spatial references on the front side, and which has a central passage opening to receive a tension rod, connected to the backside of the work-holding fixture, and a bolt, whose front end can be coupled with the tension rod and whose rear end can be connected to the collet.