Abstract: A spindle apparatus which facilitates assembling and removing operations at the time of maintenance and which is low cost. In the invention, the diameter becomes smaller in the order of an inner peripheral diameter of an outer cylinder (3), an inside diameter of a stator (4), and an outside diameter of a bearing sleeve (11); a sub-assembly (2) made up of a front housing (8), a rotating shaft (6), and the bearing sleeve (11) is withdrawable from the outer cylinder (3); and the diameter of a rotating part in an arbitrary section located rearwardly of the bearing sleeve (11) is made smaller than a minimum diameter of a non-rotating part between a rear end of the bearing sleeve (11) and the section.

Abstract: The invention provides an improved seal structure of cutting fluid supplied to a spindle of a milling spindle. The milling spindle 100 comprises a spindle 20 supported within a housing via a bearing 16, and a drawbar 24 having a through coolant passage 22. The cutting fluid C1 passing through the rotary joint 40 and 50 is sent to the through coolant passage 22, but a portion thereof is collected in a drain chamber 105. A rotation member 110 is attached to a rear end portion of the spindle 20, which is equipped with a labyrinth device 150 having a lip seal member 152. An air supply member 120 has two air seal members 142 and 144, and air A1 is sent toward the labyrinth device 150, by which an air seal is formed.

Abstract: The invention provides an improved drain structure of a cutting fluid supplied to a spindle of a milling spindle. The milling spindle 100 comprises a spindle 20 supported within a housing via a bearing 16, and a drawbar 24 having a through coolant passage 22. The cutting fluid C1 passing through the rotary joint 40 and 50 is sent to the through coolant passage 22, but a portion thereof is collected in a drain chamber 110. When the pressure within the drain chamber rises, the drain device 150 pushes open the ball 160 resisting against the spring 170, and the cutting fluid C1 is discharged to the exterior.

Abstract: The invention relates to a spindle (1) for a machine tool, in particular a motor spindle, with a housing (2) for accommodating an electric motor (3) and a shaft (4) that can be driven by the latter, and with a tool holder (5) for a tool (6) that can be electrically connected, wherein a draw rod (7) is provided for actuating the tool holder (5) of the spindle (1) and wherein the draw rod (7) has a current conductor (8) for supplying current to a held tool (6).

Abstract: A tool clamping device includes: a tool holder having a two-face restraint portion constituted by a tool taper portion and a tool end surface; a spindle having a spindle taper portion facing the tool taper portion and a spindle end surface facing the tool end surface, wherein the tool holder is clamped to the spindle by performing an operation to pull the tool holder in toward the spindle; and a clamping unit housed in the spindle, wherein, when the tool end surface is in contact with the spindle end surface and the tool taper portion is fitted into the spindle taper portion, a gap is formed between the tool taper portion and the spindle taper portion.

Abstract: It is an object to provide a spindle device of a machine tool which has a simple structure and is capable of having high suction efficiency of cutting chips. A draw bar bringing engaging claws into engagement with a tool holder or releasing the engagement includes an engagement drive part moving the engaging claws to an engagement position with the tool holder; and a draw bar main body connected to the engagement drive part, and the engagement drive part is inserted into the draw bar main body to be detachably connected to an inner surface of the draw bar main body.

Abstract: In the case of a motor element, in particular of dental technical handpiece or a motor spindle, which at least in its front region has an elongated shank, rotatably mounted in which there is a hollow drive shaft, arranged in whose front end region there is a collet chuck for a tool that is connected in its rear end region by means of a coupling to a rod that extends towards the rear and is pretensioned towards the rear or towards the front by means of the force of a spring and can be displaced towards the front or towards the rear against the force of the spring by means of an actuating mechanism, with the spring being stayed on the draw rod towards the rear and being stayed against an inner first shoulder of the drive shaft towards the front, arranged at the front end region of the spring there is at least one supporting element that is elastically pretensioned radially outwards and springs out behind the shoulder when the draw rod is pushed with the spring from the front into the drive shaft, and the suppor

Abstract: Machine tool comprising a machine frame (10, 20), a tool spindle (30) that can be driven so as to rotate, a workpiece clamping mechanism (12) and a magazine, wherein the tool spindle (30) and the workpiece clamping mechanism (12) can be moved relative to one another on a linear X-axis in a controlled manner, and wherein the tool spindle (30) can be moved in a controlled manner in relation to machine frame (10, 20) in Y- and Z-axes which are perpendicular to the X-axis and to each other and can be pivoted in a controlled manner around a C-axis parallel to the Z-axis, wherein the magazine has at least one magazine wheel (42, 66) which can be positioned rotating around a rotational axis parallel to the Z-axis, that the magazine wheel (42, 66) has recesses (58, 76) for tools (60) and/or workpieces (62, 64, 78) arranged distributed in its circumferential direction, wherein a workpiece gripper (34), which can be moved in common with the tool spindle (30), is assigned to the tool spindle (30), and wherein the tool s

Abstract: A machining unit comprising a quill carrying a spindle, a tool clamping mechanism on a forward end of the spindle, a drive shaft for rotatably driving the spindle through the quill, a tool feed actuator for extending and retracting the quill to and from a home position in both axial directions, the clamping mechanism being arranged to grip a tool holder when the quill is at or forward of the home position and to release or accept a tool holder when it is rearward of the home position.

Abstract: A machine-tool spindle device includes: a spindle; a front housing for rotatably supporting the spindle; a first drive motor having a first rotor installed securely on the spindle and a first stator installed securely within the front housing; a rear housing installed on a rear end side of the spindle in the front housing; a second drive motor having an annular second rotor which is disposed coaxially to the spindle near a rear end of the spindle and which is supported rotatably within the rear housing, and a second stator installed securely within the rear housing; a connecting mechanism for connecting the rear end of the spindle and the second rotor and releasing the connection; and a clamping mechanism, disposed within the attaching hole of the spindle and within the second rotor, for clamping a tool attached to the spindle.

Abstract: A machining center having a draw bar extending through a spindle with coolant positioned inside the draw bar for cooling a tool comprises a piston rod movable between an operating position and an extended position, a drive post rotatable about an axis of rotation, operatively connected to the draw bar, a coolant union comprising a non-rotatable portion and rotatable portion, wherein the drive post is attached to the rotatable portion such that the rotatable portion is rotatable with the drive post about the axis of rotation, and a bridge, wherein the drive post extends through the bridge to attach to the coolant union and the bridge permits rotation of the drive post but resists dislocation of the drive post from the axis of rotation. Movement of the piston rod from the operating position to the extended position moves the drive post and coolant union to an extended position.

Abstract: The subject matter of the present invention relates to a clamping device for clamping a tool or a tool holder (2) in a machine spindle (1), comprising a drawbar (6) that can axially move back and forth between a clamping position and a release position, a clamping spring (18) for actuating the drawbar (6) in the direction of the clamping position, a minimum of one sensor (20) for monitoring the clamping force, and a clamping cone (8) having a plurality of clamping elements (9) that rest against its outside surface, which clamping elements, via the axial movement of the clamping cone (8) by means of the drawbar (6), can be moved back and forth between a clamping position in which the tool or tool holder (2) is retained and a release position in which the tool or tool holder (2) is released.

Abstract: An automatic tool changing assembly for a machine tool has a bottom frame, a base, a cylinder block, an air motor and an air transporting device. The bottom frame is securely mounted on the machine tool and has a bottom panel, two sliding bars and a spring. The base is movably mounted on the bottom frame above the bottom panel and abutting the spring. The cylinder block is securely mounted on the base and has a piston rod, a piston disk and an air cylinder. The air motor is securely mounted on the base and has a cylinder, a jacket, a mounting groove and a cylinder tube. The air transporting device is mounted in the air motor and has a mounting tube, a first compression ring, a first sealing ring, a middle compression ring, a second sealing ring, a second compression ring, a mounting axle and an axle spring.

Abstract: For a spring sliding on the drawbar, the coil spring is used; the removal work for keeping the inner diameters of the coil springs aligned is performed such that the clearance between the outer diameter of the drawbar and the inner diameter of the coil spring becomes a minimum; and the coil springs are caused to be guided integrally with the drawbar. By doing so, the movement of the center of gravity of the spring that is caused by repeated rotational operation of the main spindle or repeated tool clamping operation will be reduced and the amplitude by vibration will be made smaller.

Abstract: A toolholder (50) with a controllable critical angle, such as a lead, trailing, rake or clearance angles, includes a tool spindle (42a) for retaining the toolholder in a tool rest (42) of a machine tool. The machine tool (10) includes at least one linear axis, for example, three mutually perpendicular axes, a rotary axis and a rotation axis. The rotary axis and/or rotation axis is controllable to move to a specified position in synchronization with a movement of one of the linear axes. An adaptor (54) supports a cutting tool (56) that is retained in the adaptor by a clamp (58). The cutting tool (56) defines a critical angle, such as a lead angle, a trailing angle, a rake angle and a flank clearance angle, wherein the critical angle is corrected as a vector of movement of at least one of the linear axis is changed. In addition, the cutting tool (56) can be positioned on opposite side of a centerline of rotation of the workpiece to effectively double the life of the cutting tool.

Abstract: A sensor detects an axial position of a rod controlling a tool-gripping collet in a tool-holding spindle whenever a tool is picked during a working session. The current obtained rod position value is compared with previous rod position value, which has been obtained and stored during the previous tool-picking and, if their deviation is larger than a predetermined threshold, the collet closure is notified as defective. The rod position is obtained as an average of a plurality of closely spaced readings, which are taken after a predetermined delay from the collet closure.

Abstract: The invention relates to a clamping device for clamping a tool (8), or tool holder in a working spindle (4), in particular, of a machine tool, comprising a drawbar (10), arranged to be displaced within the working spindle (4), a clamping set (12), arranged in the working spindle (4) and displaceable between a clamping position and a released position by means of the drawbar (10), a spring arrangement (14) provided for the drawbar (10) to generate the drawing force for the clamping set (12) and a releasing unit (17; 49), by means of which the clamping set (12) may be moved into the released position by the drawbar (10) against the force of the spring arrangement (14). According to the invention, a simplified operation of the clamping device may be achieved, whereby the releasing unit (17; 49) may be operated by an electrical actuator (62, 63, 53, 54).

Abstract: A main spindle apparatus has a main spindle having a through hole, a main spindle head rotatably supporting the main spindle therein, a tool holder clamp unit including an unit main body having a tool mounting hole to which a tool holder is mounted, a clamp mechanism for clamping the tool holder and a bias mechanism for biasing the clamp mechanism in a clamping state and a clamp release mechanism provided on the main spindle head side and releasing the clamping state of the clamp mechanism by operating the bias mechanism, wherein the tool holder clamp unit is mounted on the though hole of the main spindle so that the tool holder clamp unit is detachable from front side of the main spindle.

Abstract: There is provided an innovative tool mounting device for a turning center in which special manipulation is not required even with a simple configuration, and whereby when a cutting tool is clamped/fixed, the bearing unit is deformed by the retraction force of the drawbar because the cutting tool is supported by the ram, the tapered shank is automatically pressed to the mounting engagement unit in a state in which the cutting tool is supported by the ram, an automatic mechanical lock in a state of dual-surface restraint can be implemented, and the turning tool can be securely clamped/fixed.

Abstract: A machine tool transmission, in particular a spindle transmission, with which the force and/or the torque transfer from an output shaft (3) of a transmission (1) takes place directly on a spindle (15). The spindle (15) is placed co-axially over the output shaft (3). An integration of a sealed rotary feed-through is proposed to serve as a transfer device for the flow of cooling fluids, oil or air between the transmission output shaft and the spindle (15).

Abstract: A motor spindle for causing rotation of tools on a machine tool has a spindle motor with a motor shaft and a spindle shaft driven by the motor shaft and having a tool clamping means. From the tool clamping means there extends through the spindle shaft and the motor shaft an axially sliding draw rod for clamping tools or tool receiving means. The motor shaft is supported in a rotatable fashion, independently of the spindle shaft in a motor housing and the spindle shaft is supported independently from the motor shaft in a spindle housing, which is attached to the motor housing in a detachable manner. The spindle shaft is coupled in an interlocking manner in the direction of rotation with the motor shaft but is able to freely slide in it.

Abstract: In the case of a machine tool which comprises at least one working spindle with a tool-holding fixture for tool holders carrying tools, and a tool changer with a gripper for the tool holders in order to transfer the tool holders between their magazine position, which is spaced apart from the tool-holding fixture, and their working position in the tool-holding fixture, a clamping system with a clamping apparatus by means of which a tool holder inserted into the tool-holding fixture is fixed is arranged in the working spindle, the clamping system additionally comprising a retaining apparatus for a tool holder situated in the tool-holding fixture. In the case of a method carried out on this machine tool, the clamping system carries out a retaining operation which temporally precedes the clamping operation in order to grasp the tool holder inserted into the tool-holding fixture before the clamping apparatus fixes the tool holder.

Abstract: A versatile toolholder system is provided that is used by a numerically controlled machine tool. The toolholder system has an attachment portion that has a standardized shape to allow the toolholder to be used by conventional numerically controlled machine tools. The toolholder system is comprised of a toolholder body, a collet adaptor that allows a desired collect to fit into the toolholder body, a pull-up means to pull a collet to fasten the collect in the toolholder body. Various sizes and configurations of collet adaptor can be used to accommodate various collets of different shapes and sizes.

Abstract: A hollow portion of a spindle through which a draw bar and a disc spring assembly are inserted has a closed chamber structure and constitutes an oil pool chamber in which a lubricating oil is filled. The bearing portions that support the draw bar in the oil pool on both sides have the same inner diameter so that the volume of the oil pool chamber does not change when the draw bar is moved forward and backward. As a result, the lubricating oil is not pushed out of the oil pool chamber. Thus, a spindle unit can be provided in which a clamping device including the draw bar and the disc spring assembly for clamping a tool or a workpiece pallet at the forward end of the spindle can be reliably lubricated, so that the friction on and the breakage of the clamping device is reduced and that the service life of the unit is lengthened.

Abstract: A motor spindle for machine tool.

Abstract: The invention relates to a clamping device for clamping a tool (8), or tool holder in a working spindle (4), in particular, of a machine tool, comprising a drawbar (10), arranged to be displaced within the working spindle (4), a clamping set (12), arranged in the working spindle (4) and displaceable between a clamping position and a released position by means of the drawbar (10), a spring arrangement (14) provided for the drawbar (10) to generate the drawing force for the clamping set (12) and a releasing unit (17; 49), by means of which the clamping set (12) may be moved into the released position by the drawbar (10) against the force of the spring arrangement (14). According to the invention, a simplified operation of the clamping device may be achieved, whereby the releasing unit (17; 49) may be operated by an electrical actuator (62, 63, 53, 54).

Abstract: A spindle unit for a machine tool includes a drive unit having a drive shaft and a spindle head assembly constructed for receiving a tool and having a hollow spindle head shaft driven by the drive unit. Arranged for axial displacement in the hollow spindle head shaft is a tie rod which is mechanically coupled with the drive shaft so as to transmit an axial movement of the drive shaft to the tie rod.

Abstract: An object of the invention is to provide a spindle apparatus which facilitates assembling and removing operations at the time of maintenance and which is low cost. In the invention, the diameter becomes smaller in the order of an inner peripheral diameter of an outer cylinder (3), an inside diameter of a stator (4), and an outside diameter of a bearing sleeve (11); a sub-assembly (2) made up of a front housing (8), a rotating shaft (6), and the bearing sleeve (11) is withdrawable from the outer cylinder (3); and the diameter of a rotating part in an arbitrary section located rearwardly of the bearing sleeve (11) is made smaller than a minimum diameter of a non-rotating part between a rear end of the bearing sleeve (11) and the section.

Abstract: An actuator mechanism arranged on a top head portion of a Bridgeport-type vertical milling machine, for controlling intermittent, tool-changing longitudinal movement of a collet-supporting drawbar in that Bridgeport-type vertical milling machine. The actuator mechanism comprises a pressor pin supported on the head portion of the vertical milling machine. The pin is arranged in reversibly abutable contact with the upper end of the drawbar in the machine. A biasing member is arranged to effect movement of the pressor pin against the upper end of the drawbar to effect movement of the drawbar and permit change of a collet and tool thereby.

Abstract: An extension fixture for a turning tool includes a shank, a pull rod, a clamping sleeve, and a fixing member. Thus, the fixing member presses the rotation head of the pull rod to prevent the pull rod from being rotated, thereby preventing the clamping sleeve from being loosened from the pull rod, so that the turning tool is clamped by the clamping recess of the clamping sleeve. In addition, the pull rod is positioned in the shank by the fixing member to prevent the clamping sleeve from being loosened from the pull rod, so that the turning tool is clamped in the clamping sleeve closely and will not produce a vibration during operation of the turning tool, thereby preventing the turning tool from being broken due to the vibration.

Abstract: The invention concerns a device (1) for fixing a tool on a shaft (2), comprising a drawbar (3) which can slide axially inside the shaft (2) and which is used to releasably lock tools fixed on the shaft (2), in particular for automatically changing tools in automatic machine-tools. The drawbar (3) is housed in the shaft locked in rotation and has an external thread (4) whereon is urged to be pressed a threaded body (2) having a corresponding internal thread (6). The drawbar (3) is so arranged as to be able to slide in the shaft (2), by rotation of the threaded body (5), to enable change of tools.

Abstract: An apparatus for pneumatically amplifying the force acting upon a lock rod to retain a toolholder within a toolholder receiving member has a spindle extending from the toolholder receiving member and at least two in-line dual acting piston/cylinder modules within a cavity within the bore of the spindle. Each module has a piston within an associated cylinder and wherein the lock rod, through a drawbar, is attached to the piston of each module such that when each module is pressurized, the combined force of all of the pistons is applied to the lock rod. The invention is also directed to a method for achieving this task.

Abstract: A spindle assembly for a machine tool comprising a housing having at least one bearing seat, a bearing having inner and outer races mounted in the bearing seat, a sleeve disposed between a race of the bearing and the housing, adhesively bonded to the housing, and a spindle mounted on the other race of the bearing wherein the spindle is axially aligned relative to the bearing and the spindle and bearing are displaceable axially relative to the sleeve rigidly secured to the housing.

Abstract: A collet chuck configured to connect to a standard milling machine spindle, wherein the collet chuck includes a centering sleeve having a tapered outer peripheral surface for contact with an inside peripheral tapered surface of the spindle and has an outer end disposed adjacent the mounting end of the spindle, a chuck body having a base with an outer end including mounting end to mount to the end of the spindle, and a biasing element operably disposed between the outer end of the centering sleeve and a portion of a back side of the base in a manner such that the biasing element exerts a force on the back side prior to a direct connection of the base to the mounting end thereby providing for variances in connection of the base to the mounting end of the spindle and assuring concentricity is maintained when so connected.

Abstract: A release device for actuating a clamping device for tools has at least one release element and a drive drivingly connected to the at least one release element for moving the at least one release element from a rest position into a release position in which a draw bar of the clamping device is moved against a clamping force into a disengaged position. The drive is an electric motor. The axis of the electric motor can be aligned with the axis of the release device but an angled arrangement of the electric motor and of the release device relative to one another is also possible.

Abstract: A milling tool holder apparatus includes a tool holder having a male structure received in a female opening of a shank, and a camming plug received in a transverse plug-receiving opening in the shank and the tool holder. Turning the camming plug in one direction moves the male structure axially to a locked position. Turning the camming plug in the opposite direction moves the male structure axially to a release position.

Abstract: A machine tool includes a base having a spindle rotatably attached to a support for supporting a tool member, and a fluid supplying device for supplying fluid into the spindle, for cooling purposes. The fluid supplying device includes a housing secured to the support for rotatably receiving the spindle, a casing is secured to the housing and has a channel for communicating with the conduit of the housing, and a membrane is secured between the housing and the casing and disposed between the bore of the housing and a space of the casing for pumping the fluid from the space to the channel of the casing. A check valve is disposed in the casing and has a spring member for biasing a ball to selectively block or open a passage of the casing.

Abstract: To provide a tool mounting device for a turning center that allows a rotating tool to be clamped/fixed using a shared clamp mechanism (8), and a turning tool (1B) to be clamped/fixed in an engaged/locked state in a turning center.

Abstract: Disclosed is an apparatus for detecting a position of a drawbar unit installed in a spindle unit. The apparatus is a part of an automatic tool exchange device for exchanging tools in the spindle unit of a machine tool. The apparatus transmits a signal to a main controller after detecting the position of the drawbar such that the main controller checks a state of a tool clamped by the drawbar unit. The drawbar unit is installed in the spindle unit forming the automatic tool exchange device and clamps the tool at a front thereof. A core is installed at a rear peripheral portion of the drawbar unit and a coil section having a cylindrical shape is wound around an outer peripheral portion of the core. An LC oscillating circuit is provided such that the LC oscillating circuit includes the coil section as a part thereof.

Abstract: A chuck actuator has a hollow housing having a chamber and having a front end and a rear end. A ring in the chamber forms with the front end thereof a front compartment and a piston in the chamber between the ring and the rear end forms an intermediate compartment with the ring and a rear compartment with the rear end. A stem on the piston projecting forward through the ring and through the intermediate and front compartments is adapted to engage and open a chuck and is formed with a region of enlarged diameter. The piston is shiftable between a rear position with the enlarged-diameter region offset rearward from the ring and with the stem forming with the ring an axially extending passage between the front and intermediate compartments and a front position with the enlarged-diameter portion fitting snugly in the ring and substantially closing the passage.

Abstract: The invention relates to a device for clamping a hollow shaft tool (1) or tool holder provided with a conical hollow shaft (3) in a machine spindle (2) provided with a taper bore (4), especially for use in a machine tool. The device comprises a clamping sleeve (7), axially displaceable inside the machine spindle (2), a tow-rod (8) for displacing the clamping sleeve (7) and being movable between a release position and a clamping position, and a plurality of pincer elements (19) associated with the clamping sleeve (7). The pincer elements are radially displaced by the displacement of the clamping sleeve (7) and have clamping faces (21, 24) to be placed on a conical inner surface (22) of the conical hollow shaft (3) and an opposite surface (26) on the work spindle (1). The aim of the invention is to provide a clamping device of the aforementioned kind wherein the hollow shaft tool is reliably retained in the machine spindle even when the tow-bar is already released.

Abstract: A spindle of a machining center is equipped with a clutch, which is fitted to a main spindle housing, and directly connected to a power source for separable engagement with a shaft coupling sleeve, and which is guided by sloping guiding trenches of a clutch disk such that a pull rod of the spindle is actuated for a tool shank housing to be changed between a clamped position and a released one; thus, power of the power source can be usually provided to the spindle to effect rotation of the spindle for machining a work piece, and the clutch can be operated for allowing the pull rod to be directly actuated with power of the power source without hydraulic mechanisms.

Abstract: A holder for a collar having an axially forwardly directed shoulder and axially rearward thereof a radially outwardly directed centering surface has a drive sleeve fitted over the collar and a plurality of angularly spaced jaws each formed with an axially rearwardly directed face and displaceable between an outer position with their faces bearing on the shoulder and an inner position with their faces out of engagement with the collar. An axially displaceable actuating member can move the jaws between their inner and outer positions. A plurality of retaining fingers each have an axially rearwardly directed face and axially rearward thereof a radially outwardly directed centering face. These fingers are each radially elastically deformable between an outer position with the front-end faces bearing axially rearward on the shoulder and the centering faces bearing radially outward on the collar centering surface and an inner position out of contact with the collar.

Abstract: A force limiting workpiece holding device for holding a workpiece in a workpiece processing assembly having a spindle and a closer that applies a force, comprises a workpiece holder slidably mounted to the spindle. The workpiece holder includes a plurality of circumferentially-spaced gripping segments that are movable between expanded and contracted positions to grip and release a workpiece. A force limiting coupling structure includes a biasing structure having a spring force. The coupling structure is operatively mountable between the workpiece holder and the closer such that a force applied by the closer to move the gripping segments of the workpiece holder between the expanded and contracted positions is transferred to the workpiece holder through the coupling structure and the biasing structure thereof, whereby a resultant force being applied to the workpiece holder by the closer is limited to the spring force of the biasing structure.

Abstract: A digitally controlled machine for bending, forming, folding or coiling a bar conventionally includes a frame, and a rotary bending tool for producing bends in different planes. A bar is moved along an axis and is brought through a bending snout associated with the frame, and then through a bending tool which is movable relative to the axis by a motor-driven turner. The bending tool is received by a standard conical tool support, and the turner is combined with means for automatically clamping and unclamping the jaws of a gripper associated with the turner. The jaws of the gripper are automatically unclamped when the turner reaches the end of its axial stroke, away from the bending station, and are automatically clamped when the turner begins its axial movement in the opposite direction, toward the bending station.

Abstract: A machine tool has a spindle which has a tool receptacle for an interchangeable tool holder. The tool holder is chucked into the tool receptacle during operation of the machine tool. A first passage having an outlet opening is arranged in the interior of the spindle. The outlet opening opens out inside the tool receptacle. The tool holder has a coolant tube which engages in the outlet opening of the first passage. According to the invention, the first passage comprises a continuous inner tube, the first end of which is connected to a connection for a coolant source and the second end of which is designed for connection to the coolant tube.

Abstract: Eccentricity is not allowed to occur in a blade section, and a blade section is maintained in a stable installation state. A hook section 124, which is composed of a shaft section 125 and an end section 126 provided with a corner section 132 that protrudes as a ledge farther to the outside in the radial direction than this shaft section 125, is formed in a blade section 120. A hook hole 144, which allows the passage of end section 126 of hook section 124, is formed in a bolt section 140. Engaging sections 150 are formed around hook hole 144.

Abstract: A tool such as a milling or drilling tool includes a shaft having a front recess in which a cutting head is disposed. A drawbar disposed in the shaft includes a plurality of flexible tongues disposed in the recess. The tongues form a recess in which a rear knob of the cutting head is received. A retainer urges the drawbar axially rearwardly to retain the cutting head in the recess. The shaft includes axial projections at its front end which are received in respective rearwardly open recesses of the cutting head to prevent relative rotation between the shaft and the cutting head.

Abstract: A column (4) is provided with a hanging jig (holding mechanism) (50) for holding an unclamping apparatus (30) and a spindle head (15) is made to be able to move in an up and down direction by itself by removing a bolt (43) in a state of hanging to hold the unclamping apparatus (30) by the hanging jig (50).

Abstract: A machine spindle includes a casing and a clamping mechanism disposed in the casing. The clamping mechanism includes front and rear drawbars which are relatively movable axially within the casing. A gas spring biases the rear drawbar rearwardly, and a force transmitting mechanism transmits such rearward motion to the front drawbar for moving the front drawbar rearwardly. In response to its rearward movement, the front drawbar actuates a clamp for clamping a tool. The gas spring includes a housing disposed in the casing and defining a gas chamber having a front wall through which the rear drawbar extends. The gas spring also includes a piston disposed in the gas chamber for axial movement therein. The piston is releasably connected to a rear end of the rear drawbar by a releasable coupling disposed in the chamber.