Abstract: The invention relates to a tool-spindle arrangement comprising a main spindle rotatably supported in a spindle housing and an electrical drive motor drivingly connected to the main spindle. The main spindle is constructed hollow to receive operating elements of the spindle arrangement. It is suggested that the motor shaft of the electrical drive motor itself is constructed as a main spindle.The main spindle is part of the drive motor. It is preferably constructed in two parts, namely, a spindle section and a motor-shaft section which, when connecting the drive motor to the machine, are coupled with one another. The motor-shaft section is also constructed hollow to receive operating elements, for example clamping members for chucking of the tool, air-blast pipes, cooling-medium pipes, etc.

Abstract: The present invention relates to an automatic clamping unit of the type having a spring loaded lock rod that is movable between an unlocked and locked position. A pair of locking balls are confined about the locking rod and are operative to move outwardly for engagement with the shank of a tool holder in response to the locking rod moving from the unlocked position to the locked position. The lock rod of the present invention includes a variable sloped ramp for engagement with each locking ball. As each locking ball moves along the variable sloped locking ramp, the mechanical advantage applied to the locking balls through the ramp varies due to the variation in slope. Each locking ramp is particularly configured such that the resultant locking load exerted by the locking balls against the shank of the tool holder is relatively constant although the position of the locking rod and the force being applied to the locking rod varies.

Abstract: A coaxial shaft and housing assembly is adapted to be locked against relative rotation. It comprises a housing or hollow motor shaft (2) having a threaded internal cylindrical surface (5) of a first pitch (m), and a coaxial shaft (10) received in the housing (2) and having an intermediate threaded external portion (10') of the same pitch (m). A plurality of stud pins (7), externally threaded with the same first pitch (m) are positioned between the shaft (10) and the internal surface (5) of the housing (2), which stud pins are in meshing engagement both with the portion (10') of the shaft (10) and the surface (5) of the housing (2). The stud pins (7) are freely rotatably mounted in a carriage (9) mounted for axial translation between the inside of the housing (2) and the shaft (10).

Abstract: The drive means (3) is arranged directly on the tool (2) and can be moved together therewith about a plurality of axes (A, B, C and D). The drive means is provided with a tool holding means for automatically delivering or receiving tools in a tool magazine (5) which is arranged above the region of operation of the tool (2). In that way a plurality of tools can be operated with a single drive means, wherein the tool guidance, workpiece forward feed and interchange of tools can be fully automated and programmed.

Abstract: The operating mechanism of a tool retention and ejection mechanism for the spindle of a machine tool is located in an annular space between the spindle and the grill. A drawbar is slidably disposed in an axial bore formed in the spindle and is provided with a collet at the cutter end of the spindle for engaging a tool holder and drawing it into the socket of the spindle. The drawbar is shifted into its locking position by an annular array of balls that are forced against a bevel surface by a cam ring that is moved to a locking position by a spring. The bevel surface is formed on a ring that encircles the spindle and which is coupled to the drawbar by a crossbar that extends radially through the spindle. In order to increase the power available for releasing the mechanism, two annular pistons are provided in an annular cylinder disposed in the space between the spindle and the quill.

Abstract: This invention relates to an improved integral machined spring adapted to be used in high speed spindles employing a tool holding mechanism which rotates with the spindle. The spring assembly includes a plurality of lands and slots arranged circumferentially and in tiers and includes a top and bottom face. The axial width dimension of the slots adjacent to the end faces is less than the axial dimension of the slots between the end faces in order to distribute the stresses more uniformly. The lands form a plurality of circumferentially arranged lobes whose radial dimension is greater than the portion between the lobes, again to distribute the stresses more uniformly. Various forms of the invention are described including a spindle assembly having a non-rotating actuating rod.

Abstract: A fluid bearing assembly, e.g., air or gas, of the hydrostatic or hydrodynamic type, for use as a spindle and the like, includes spaced journals mounted on a shaft for rotation therewith. The housing includes spaced support bearings cooperating with the journals to form a gas gap therebetween. The support bearings are resiliently mounted in the housing for axial, radial and angular movement through the use of continuous resilient support elements positioned between the housing and the support bearings and continuously in contact with each. The resilient support elements are preferably self-energizing and comprised of relatively low coefficient of friction materials to reduce the friction of the system thus allowing rapid adjustment of the bearing in response to loads on the shaft. Various details are described with respect to the various structures illustrated, including the details of an air bearing spindle assembly of relatively light weight and capable of operating at speeds in excess of 100,000 RPM.

Abstract: Quick change attachment for clamping chucks on a machine spindle in which a locking bush (32) is actuated by an axially shiftable locking piston for actuating the chuck clamping, while an adjusting rod (44) adjustable from the clamping cylinder is provided for actuating the clamping jaws of the chuck. Axially secured at the end of the adjusting rod to connect the clamping piston rod with the adjusting rod (44) are coupling pieces (50) which execute plier-like gripping and expanding movements by means of a tipping edge and are actuated from a control bush 58 overlapping them together with the locking bars for the chuck clamping driven by the locking bush (32).

Abstract: Described is a coupling device between a workpiece support or a tool support, such as for example a tool system module, for example in the form of a basic tool holding fixture, and a handling device, such as for example a machine tool, especially a spindle. For rapidly producing and releasing the connection between these components while making high axial forces available, a clamping device with an operating rod is provided by which a key mechanism is controlled, with which clamping elements provided in the part to be coupled can be pressed essentially radially outward into a suitably shaped recess on the other part to be coupled.

Abstract: An improved high-speed spindle assembly for a shank-driven cutting tool comprises a hollow spindle for a collet, a titanium alloy drawbar within the spindle for threadingly engaging the collet, and a tubular resilient member within the spindle surrounding the drawbar for damping vibrations. A transverse resilient member in a threaded portion of the collet resists rotation of the collet on the drawbar. A ten-tooth involute spline provides precise sliding engagement of the drawbar within the spindle. A pair of ball bearings are axially clamped to the spindle by a pair of titanium nuts, a lower nut having a flange closely spaced from an external annular surface of a spindle housing for excluding foreign matter, an upper nut having a cavity for axially retaining a flange of the drawbar.

Abstract: A lock rod is provided extending along and reciprocally movable along an axis Y-Y and having a cylindrical cross section near one end. Two circumferentially spaced depressions are located in the cylindrical surface for receiving locking elements in an unlocked position. Extending from the first depression is a ramp inclined with respect to axis Y-Y and from the second depression is a groove parallel to axis Y-Y for driving locking elements radially outwardly to abut against a toolholder shank to lock it onto a tool support member.

Abstract: To be able, in a machine for machining workpieces and showing a spindle with spindle draw bar, to use an arm (10) with a draw bar pin (2) in a machining device for several working operations or separate tool holders (3) or different types of tools, the draw bar pin (2) is arranged in one piece with or in communication with a tool element (4) including in the arm (10). The tool element is shaped to hold tools or the tool holder (3). The draw bar pin (2) and tool element (4) plus eventual existing connecting elements (5, 12, 13) between the draw bar pin and the tool element are arranged displaceable in the arm (10), whereby the draw bar force of the machine's spindle draw bar is utilized to retain the tools or tool holder in the arm.

Abstract: A tool change apparatus for a machining center and the like comprises a spindle head vertically slidably mounted on a column, and a spindle rotatably mounted in the spindle head. The spindle has at the lower end thereof a tapered tool reception bore in which a tool is releasably held. When a draw bar is shifted upwards, resilient clamper arms are forced to enter a reduced bore to be contracted thereby so that a head of the tool is clamped. When the draw bar is shifted downwards, engageable end portions are moved into an enlarged recess-like portion whereby the clamper arms are allowed to expand outwards to release the head of the tool. Even when the head is released, a stop pin urged by a spring continues to engage the head of the tool whereby the tool is still held by the spindle.Tools are held by a series of magazine pots. Each pot is indexed to a tool change station.

Abstract: An improved tool holder system and method of using the same is disclosed, characterized by use of a plural extension member assemblies which permit the rapid adaptation of conventional machine tool holders for use in both automated machine tool changers as well as manual machine tool changer systems. In addition, the present invention discloses an improved method of mounting a cutting tool within a tool holder to accurately position the cutting tool height within the tool holder and subsequently prevent any backing out of the cutting tool from the tool holder during the cutting operation. Further, an improved appartus and method of ensuring concentric mounting cutting tool within a tool holder is disclosed.

Abstract: An exchange mechanism enables removable members such as a tool member to be secured to an irremovable machining center. The exchange mechanism comprises a cassette connectible to the tool member, and a plurality of locking members and associated actuator carried by the machining center. The actuator slides the locking members radially outwardly such that inclined faces on the locking members abut corresponding inclined faces on the cassette. The inclined faces are oriented such that a force is exerted on the cassette which has an axial component urging the cassette toward the machining center, and a radial component tending to center the cassette.

Abstract: Central drawbar operated tooling connection system wherein a pair of wedges are positively driven laterally outward and retracted by reciprocation of a central drawbar. Mechanical advantage of a key slot between drawbar and wedges plus mechanical advantage of the wedge angle amplifies a drawbar force for producing axial loading in the order of 5:1. Alternative forms of drawbar actuation such as by screw thread feed, preloaded spring with hydraulic release are optional.

Abstract: A typical machine tool utilizes a horizontally disposed, elongated, substantially planar worktable which is supported by a knee between the ends of the worktable. When a workpiece is placed on the worktable and the worktable is moved relative to the knee in performing of the machining operations, the outer ends of the worktable will slightly sag. The structure of this invention is for a support apparatus to slightly raise the ends of the worktable so that the planar operating surface of the worktable is accurately maintained horizontal along the entire longitudinal length of the worktable.

Abstract: This invention relates to an improved integral machined spring adapted to be used in high speed spindles employing a tool holding mechanism which rotates with the spindle. The spring assembly includes a plurality of lands and slots arranged circumferentially and in tiers and includes a top and bottom face. The axial width dimension of the slots adjacent to the end faces is less than the axial dimension of the slots between the end faces in order to distribute the stresses more uniformly. The lands form a plurality of circumferentially arranged lobes whose radial dimension is greater than the portion between the lobes, again to distribute the stresses more uniformly. Various forms of the invention are described including a spindle assembly having a non-rotating actuating rod.

Abstract: A tooling assembly (10) is disclosed having a plurality of tool holders (18, 20) for independently driven cutting tools (14, 16), the tooling assembly adapted for automatic insertion and removal from a spindle assembly (12). The plurality of cutting tools (14, 16) are disclosed as arranged to be able to simultaneously machine concentric round features on a workpiece (8), such as a valve stem guide bore (9) and valve seat (7). The tooling assembly (10) includes inner and outer tool bodies (30, 24) rotatably mounted together, each carrying a tool holder (20, 18), the tool bodies (30, 24) rotated at different speeds. A coupling arrangement for the tooling assembly includes an outer draw bar (82) moveable to couple the tooling assembly (10) to the spindle assembly (12), and an inner draw bar (84) separately coupled to moveable element (20) to enable independent axial advance of one of the cutting tools (14) by axial movement of the inner draw bar (84) and coupled moveable element (20).

Abstract: A machine tool has a spindle head pivotable through 180 degrees and having a spindle rotatably mounted in its housing. As a result of the pivoting movement, the spindle head can be shifted from a vertical to a horizontal working position. The spindle head has a toolholder and an axially displaceable tension rod. Through the tension rod runs a coolant bore extending into the working zone of the clamped tool. The coolant bore is connected to a line in a transfer piston displaceable in the spindle-head housing. The coolant bore and the transfer piston line are constantly in communication so that coolant flows uninterruptedly during displacement of the transfer piston. The line communicates with a coolant supply system. The coolant can be conveyed into the working zone of the tool in any position of the tool spindle and without any appreciable increase in size of the spindle head.

Abstract: A simple, strong and fast acting tool retention subsystem is intended for both original equipment and retrofit applications in machining centers with automatic tool changer systems. A machining center incorporating the invention is described. The invention is compatible with ANSI standards for spindles, tapered tool shanks and knobs, and is configured to eliminate the tool chatter and tool shank taper unseating and release commonly occurring in conventional spring actuated tool retention subsystems when spiral fluted cutters are used. The tool shank is positively jam locked by a rotary bolt actuator means that generates a very high value of axial pre-load tension, comparable to that which was furnished by the very successful historic manual draw-in bolt retention subsystem used in milling machines. A bi-directional free wheeling impact motor drives the rotary bolt actuator means between open and closed positions of a maximally strong collet.

Abstract: A tool changer formed by a power assisted draw bar to obtain and lock, as well as release and expel, standard tapered tool holders used with machine tools. Two components, a collet cylinder and a flared stem, together comprise the locking mechanism and protrude through the unmodified spindle cylinder of a commercially available machine tool. The powered actuator assembly, which can separately translate these components, is mounted on top of the machine tool's power head.

Abstract: Threading apparatus for a vertical milling machine includes a threaded sleeve at the upper portion of a milling machine draw bar and a split nut thread guide secured to the top of the milling machine and about the upper portion of the draw bar. When the split nut engages the threads on the draw bar, rotation of the draw bar causes the draw bar to move vertically in response to the mating threads of the sleeve and the split nut so that a thread cutting tool on the opposite end of the draw bar will cut threads in a work piece. By changing sleeves and split nuts, virtually any pitch thread may be cut.

Abstract: A numerically controlled automatic tool changing machining center is provided with a rotary driven spindle concentric within which is a spindle bar that may be reciprocated out from or into the spindle by a hydraulic cylinder. Located at the forward end of the spindle bar is a tool receiving socket which is operative to releasably engage the shank of a single toolholder or multiple spindle toolhead transferred to the spindle bar from the machine tool storage magazine by a tool transfer arm. When a large, single toolholder is engaged by the spindle bar, the spindle bar is retracted into the spindle to urge the large single toolholder against the nose of the spindle.

Abstract: A tensioner having screw threads tightened by rotation of a hob drive (15) is used for applying clamping pressure to a hob (10) in a working position in a hobbing machine. The tensioner extends through the hob between the end supports (11 and 12) of the hobbing machine and has threads arranged so that a wrench system can hold part of the tensioner against rotation while the hob drive tightens the threads to a predetermined clamping torque. The tensioner can be a single draw rod (20) extending from driving end support (11), through hob (10), and into threaded engagement with idler end support (12); and the tensioner can include a hob mounting arbor (45) having threaded ends into which a pair of opposed tensioner rods (20 and 46) are threaded.

Abstract: A clamping apparatus for clamping the attachment for mounting the tool to the part to which the tool is mounted of the machine tools is disclosed. The attachment for mounting the tool is coaxially provided with the taper extruding shafts which are fitted into the taper hole of the part to which the tool is mounted and the holding shafts the peripheral part on the tip end of which has the holding claw being laterally extruded. The clamping cylindrical article equipped with the claw to be held whose engagement with the holding claw, introduced by the fixed angular amount of forward rotation of the clamping cylindrical article, allows the attachment for mounting the tool to be prevented from coming off, is disposed in the part to which the tool is mounted such that the clamping cylindrical article may be rotatable and axially movable.

Abstract: A collet attachment and release mechanism for a vertical milling machine includes a movable plate vertically supporting a pneumatic, hand-held, bidirectional, rotary impact wrench above the drive head of a drawbar. The movable plate is spring-biased to keep the socket of the impact wrench out of engagement with the drive head and is manually movable vertically along parallel guide posts by means of a handle. The handle is rotatable about one of the posts to actuate a pivotally mounted switch plate on the impact wrench for rotating the socket in a counter-clockwise or clockwise direction. The mechanism may also be used as a hammer to impart a sharp blow to the drive head to free a collet that sticks in the spindle.

Abstract: An electromechanical apparatus for producing an axial force for the actuation of a clamping device, such as a chuck that rotates with the arbor of a machining tool. The apparatus includes an electric motor that has a stator and a rotor, with the relative movement between the rotor and stator being transferable, via a gear system and a shaft drive as an axial movement, to a tie rod which is preferably hollow. In order to have a small overall size, and to reduce the frictional forces that occur during actuation, the rotor is connected with a gear wheel in which meshes at least one pinion that is secured to a shaft that is mounted in a housing in such a way that it cannot shift axially. Disposed on the shaft is a nut that in turn is connected to the tie rod, which is axially movably mounted in the housing.

Abstract: A spindle of a machine tool is mounted for rotation about a longitudinal axis. The spindle comprises clamping means for clamping and releasing a tool. An energy accumulator is charged when the tool is not clamped and is at least partly discharged to tighten the clamping means when the tool is clamped. An actuating unit serves to charge the energy accumulator by means of an external force supplied via a connection. To enable employment of the spindle at very high speeds, the actuating unit and the connection are arranged in the rotating part of the spindle. The spindle rotates at at least 30,000 revolutions per minute and the connection is a releasable plug or screw connection.

Abstract: A spindle head unit having a bell crank lever (24) mounted pivotally on a spindle head (10) of a machining center to depress a drawbar (18) inserted through a spindle (14) mounted on the spindle head (10). One of arms of the bell crank lever (24) is located so as to be capable of being engaged with a guide cam (28) and a depressing end (24a) in the shape of a spherical protrusion which is not connected mechanically to an upper end (18a) of the drawbar (18) is formed in a free end of the other arm of the bell crank lever (24). The bell crank lever (24) is urged continuously by a spring means (32) so that the former arm is urged toward the guide cam (28).

Abstract: A cutting tool holder wherein a cutting tool can be released from a drawbar by selectively causing the drawbar to move along a longitudinal axis in a first direction. The drawbar is positively locked in place to prevent such movement during the cutting operation.

Abstract: A power operated wrench for acuating the drawbars on machine tools, such as vertical spindle milling machines, which permits the operator to move a single handle, and after release of a safety interlock move a pneumatic wrench into position to engage the drawbar nut and either tighten or loosen the drawbar depending on the direction of motion of the operator handle. The mechanical operation permits the operator to rotate the operator handle in the same direction as would be done if the drawbar was being manually tightened or loosened, in order to tighten or loosen the drawbar under power. The safety interlock prevents movement of the power motor into engagement with the drawbar until the machine has been shut off.

Abstract: It is a tool-replacing device to be mounted on a milling machine for automatically replacing a tool or locking a tool in place in a safe manner. The device mainly comprises a driving spindle, a motor, a reducing gear train, a transmission shaft, a sliding transmission cylinder, a spring, an attraction cylinder, and a solenoid, for actuation of a reach rod, and an electrical control case.

Abstract: A drive unit for a rotary tool, which unit includes a housing, a drive shaft mounted in the housing for transferring rotational drive force from a rotary drive to the tool, and a clamping mechanism mounted in the housing for generating a tool clamping movement along the axis of the drive shaft. The drive shaft is a hollow shaft, the clamping mechanism includes a pull rod mounted in the drive shaft and coaxially positioned relative to the drive shaft, the pull rod being mounted to be axially displaceable and fixed against rotation relative to the drive shaft, and the unit further includes a blocking device operative between the drive shaft and the housing for permitting the drive shaft to rotate relative to the housing only when the drive shaft is coupled to the rotary drive.

Abstract: For the attachment of a tool provided with a cylindrical or frusto-conical shank to a rotating machine spindle at one end of the machine spindle a complementary reception opening for the shank is provided. The shank contains a coaxial bore and a plurality of slots distributed in the circumferential direction and extending through radially to the bore, which divide the shank within the reception opening into segments. In the region of the slots the shank widens out under the influence of centrifugal forces more than does the region of the spindle surrounding the shank. Thus the radial guidance of the tool is not lost even at very high rotation rates of 10,000 r.p.m. and above. A support shoulder on an annular collar of the tool prevents axial reshifting of the shank by reason of the axial stress of a clamping device and improves the rigidity of the tool-spindle connection. The bore extends through the annular collar.

Abstract: In a cutting machine tool, a spindle head rotatably carries a vertical tool spindle, and an angle spindle attachment is detachably mounted on the lower surface of the spindle head. The angle spindle attachment carries an attachment spindle adapted to receive a cutting tool holder and rotatable by the tool spindle about an axis inclined relative to the axis of the tool spindle. The attachment spindle incorporates therein a draw bar mechanism wherein a draw bar is axially rearwardly urged by the resilient force of springs. To advance the draw bar against the springs, the angle spindle attachment is provided with a push rod movable in a horizontal direction. A thrust direction converting mechanism is further provided in the angle spindle attachment to axially moves the draw bar when the push rod is axially moved by an unclamping device. The unclamping device has an actuation rod, which is horizontally moved by a cylinder device to effect the axial movement of the push rod.

Abstract: A tool holder (1) which can be inserted into the main spindle of a machine-tool is provided on the front region of its shank portion (2) with a cylindrical guide portion (11) for a tapered ring (12) which can be braced elastically and on the rear region of the shank portion (2) there is provided a second cylindrical guide portion (12) for a second tapered ring (14) which can also be braced elastically. At least one of the tapered rings (13, 14) is advantageously provided with a longitudinal slot or partial slots. A flange portion (3) is provided on the front portion which is applied against the front end face (27) of the main spindle (5) .

Abstract: A device for the internal deburring of a pipe or shaped tubular member, such as for removing the inwardly projecting portion of an axially extending seam, includes a support body elongated in the axial direction of the pipe. A cutting ring is clamped externally to the support body adjacent one of its ends. The cutting ring has an axis extending transversely of the axis of the pipe. The support body is constructed so that the cutting ring can turn in the rotational direction around the axis of the pipe.

Abstract: A lock rod is provided extending along and reciprocally movable along an axis Y--Y and having a cylindrical cross section near one end. Two circumferentially spaced depressions are located in the cylindrical surface for receiving locking elements in an unlocked position. Extending from the first depression is a ramp inclined with respect to axis Y--Y and from the second depression is a groove parallel to axis Y--Y for driving locking elements radially outwardly to abut against a toolholder shank to lock it onto a tool support member.

Abstract: The present invention relates to a safety tool-holder for machine-tools, comprising:a quill in which is axially cut a through-opening, said quill being mounted in a body integral with the machine-tool;a rod placed in the axial opening of the quill, a first end of which rod comprises gripping means adapted to grip a tool head, whereas the second end comprises a threaded portion;axial elastic return movement means, resting, first against the quill, and second, against a nut screwed on the threaded portion of the rod and making it possible to hold the latter in working position;means for continuously controlling the rod in its working position, which means detect the variation of the elastic deformation of the nut under the action of the elastic return means.The invention finds an application in machine-tools, such as milling machines.

Abstract: The subject matter of the invention is a tool-clamping device, more particularly for milling and drilling machines, consisting of a clamping arrangement (5) with clamping tongues (6), arranged centrally and longitudinally displaceably in the tool spindle (2), of a rotational position indicator for presetting the clamping jaws into their tool-change position, and of a positioning mechanism (11, 15) for finely adjusting and fixing the tool spindle (2) in the tool-change position. In order to achieve automatic positioning of the tool spindle (2) in its tool-change position after presetting by means of the rotational position indicator, the positioning device has a cross pin (11) which is secured to the clamping arrangement (5), projects through an elongated axial hole (13) in the tool spindle (2), and is guided between two guide surfaces of a guide member (15) on longitudinal movement of the clamping arrangement (5).

Abstract: The subject of the invention is a device for clamping tools in the spindle of a machine tool, said device comprising a collet chuck located centrally in the spindle with clamping jaws at the forward end, a spring assembly to generate the necessary closing force and a mechanism overcoming the closing force to open the collet chuck. To avoid the supplying of pressure medium to the spindle and to be able to orient the spindle simply to change tools, the mechanism is located laterally next to the spindle in the spindle head and engages the collet chuck externally as well as an outer ring on the spindle. The outer ring has two notches for engagement of two noses for spindle orientation.

Abstract: A tool coupling arrangement is disclosed for a tooling assembly (10) adapted for automatic tool insertion into a spindle assembly (12), the tooling assembly (10) having an axially moveable element (20) for causing movement independently of the spindle assembly (12). In the particular disclosed applications, a pair of cutting tools (14, 16) are provided to simultaneously machine concentric features on a workpiece (8), disclosed as a valve stem guide bore (9) and valve seat (7) of an engine cylinder head. A first coupling arrangement secures this tooling assembly (10) after it is inserted within the spindle assembly (12), while a second coupling arrangement automatically couples the separately moveable element (20) to an inner draw bar (84) of the spindle assembly (12).

Abstract: A stone guide for guiding the honing stone of a superfinishing machine. The stone guide receives a honing stone unit which comprises a honing stone and a honing stone holder. The honing stone holder defines a shoulder and a contact surface. The stone guide includes a piston and a piston rod, at one end of which there is disposed a contact surface, and a rapid-clamping device displaceable in the piston rod. The rapid-clamping device includes a further piston, a further piston rod connected to the further piston and a clamping element which defines a shoulder. Both pistons are displaceable by means of a pressure medium such that displacement of the piston effects lowering of the honing stone unit unto a workpiece and the upward movement of the further piston effects engagement of the contact surfaces.

Abstract: The disclosure is of a spreadable keeper for use in the cooperative slots in a machine tool spindle and its associated shank or tang. In use, the slots are partly aligned crosswise of the spindle axis of rotation and the keeper is inserted in the slots and screw-expanded to force the tang or shank more tightly into the tapered bore of the spindle. The keeper comprises a base on which are mounted cooperative camming members operable by a screw to expand lengthwise of the spindle for exporting the tightening force.

Abstract: A replaceable tool is comprised of a tool holder forming a hole providing an engageable ditch on the insert end of the shank, a fitted hole for detachably fitting the shank of this tool holder therein and a sleeve providing a plurality of locking balls to be engaged and removed from the fitted ditch of the tool holder in the fitted hole. In the interior of the fitted hole of the sleeve, the locking balls are pressed on the engageable ditch and the draw collar for applying attraction in the axial direction of the sleeve is slidably provided. When the shank of the tool holder is fitted in the fitted hole of the sleeve, the head portion end of the tool holder is designed to be pressed on the end flange portion of the fitted hole of the sleeve, and when the draw collar is pulled in the axial direction of the sleeve, the shank portion is expanded through locking balls so as to be pressed on the inner wall surface of the fitted hole of the sleeve.

Abstract: A tool carrier for lathes, in particular a tool turret, having a plurality of stations for holding tools, at least one of which is provided with a driven tool spindle designed as a hollow shaft and rotatably mounted in a housing. This tool spindle accommodates a tool chuck which is coaxial to and non-rotatably connected with the tool spindle and is displaceable in axial direction relative to the tool spindle for opening and closing. The tool carrier also has a threaded spindle connected in axial direction with the chuck and a nut arranged thereon for opening and closing the chuck. To simplify the construction only one drive shaft is provided and this shaft is constantly coupled with the nut and connected with the tool spindle via a releasable coupling.

Abstract: This invention is characterized by that the high-frequency motor is adapted to provide the tapered surface engagements in both engaging parts between a draw bar set in a rotary shaft of the motor and a slit hook engaged with the draw bar, and between this hook and a holder for the hook, and to reverse mutually the inclined directions of these tapered surfaces so as to obtain a large clamp force.

Abstract: A quick disconnect coupling mechanism for a collet and collet tube facilitates connection and disconnection of the two members to and from one another. In a preferred form, the collet is provided with circumferentially spaced external threaded portions which are separated by unthreaded portions. The collet tube is provided with internally threaded, circumferentially spaced mating threaded portions which are separated by unthreaded portions. The collet tube can be quickly slipped over the collet, and located at a predetermined axial position thereon, and the two components can be rotated relative to one another to cause the threads to be moved into engagement with each other. The invention provides an indicator system for providing initial alignment of the collet tube with the collet. In a independently limits axial movement of the members relative to one another beyond a preset torque limit.

Abstract: A portable lathe device is modular in character and can be employed for flange facing, line boring or other purposes. The spindle carrying the tool means is readily axially adjustable, and the radial feed rate for a facing head tool carrier is infinitely variable and reversable.