Abstract: A machine tool provided with a universal head free from restrictions on its swivel operation due to the presence of a power cable to a motor directly driving a spindle and consequently expanded in range of movement, provided with a ram serving as a support, a swivel member held by the ram to be able to swivel about a predetermined swivel axis, a tool mounting member held at the swivel member, rotatably holding at its front end a spindle to which a tool is mounted, and provided with a motor for driving the spindle, a generator provided at the swivel member and generating power used by the motor, and a power source provided at the ram and supplying power to the generator.

Abstract: A tool holder apparatus mountable on a machine spindle which apparatus is adjustable and provides a solid stable support for the tool holder to eliminate any gap or spacing between the end of a machine spindle and the support collar of the tool holder.

Abstract: A workpiece fixture for gear cutting machines and an interchangeable part for said workpiece fixture are adapted to each other. One end of the interchangeable part is used for fixation to the workpiece fixture and has on the one hand a face with at least one ramp extending in the circumferential direction relative to a rotation axis, and a locking element, the locking element cooperating with a locking element of the workpiece fixture so as to permit separation of the locked interchangeable part from the workpiece fixture only if a minimum force is overcome. The workpiece fixture has for its part in addition to the aforementioned locking element a surface formed cylindrically, at least in parts, relative to a rotation axis as a radial bearing surface for the interchangeable part, and a stop face or at least one radially protruding stop pin which cooperates axially with the ramp of the interchangeable part.

Abstract: A clamping system for detachably assembling two pieces. The clamping system includes a clamping device concentrically mounted in a receiving section which extends in a hollow shaft of one of the two pieces, when the two pieces are engaged. The clamping system further includes at least two clamping bodies which can move in opposite directions and an actuating device which actuates the clamping bodies. The clamping bodies can be engaged with an undercut clamping shoulder of the hollow shaft and disengaged therefrom, whereby a pressure force is applied between the flat surfaces of the two pieces to be assembled.

Abstract: A holder for a machine tool includes a cone-shaped base body. One end of the base body has a larger diameter than the other end and includes an annular flange extending therearound. The flange includes first and second recesses formed therein. Each recess includes a bottom surface. The first and second recesses respectively form identical first distances from the bottom surface to an outer periphery of the flange. One of the recesses includes a hole. A depth-reducing element is securable in the hole such that an outer surface of the element is disposed between the bottom surface and the outer periphery, wherein an effective depth of the recess having the depth-reducing element is shorter than an effective depth of the other recess.

Abstract: A vibration dampened spindle and tool holder assembly for a rotary cutting machine. The assembly includes a spindle and a tool holder retained therewith. The tool holder has an interfacing ledge with a top surface for abutment with a distal spindle surface, and a continuous channel disposed in a proximal portion of the top surface. A resilient dampening member, having a rectangular or a circular cross sectional configuration, resides in the channel for compressed abutment with the spindle surface. Because the dampening member is situated within the channel, the interfacing placement of the spindle surface and tool holder top surface meet as the dampening member is enshrouded in the channel by these abutting surfaces and thereby protected from contaminant entry during dampening action.

Abstract: A toolholder assembly is disclosed having an elongated spindle adapted to be rotatably driven about a longitudinal axis. The spindle also includes a longitudinally extending bore open at one end. A chuck has a collet at one end for holding a tool and an elongated shank at its other end adapted for insertion into the spindle bore. A ball lock assembly releasably coaxially secures the chuck to the spindle upon insertion of the chuck shank into the spindle bore to an operable position. The chuck also includes a conical surface at the free end of the shank. This free end of the shank engages a spring loaded piston positioned at the innermost end of the spindle bore when the chuck is inserted into the spindle to its operable position and this piston includes a conical surface complementary to the conical surface on the shank. The cooperation between the ball lock assembly and the piston coaxially and securely, but releasably, secures the chuck to the spindle.

Abstract: The present relates to a spindle unit for a machine tool having a spindle rotatably held in a housing and a hydraulic tool holding system at a forward end of the spindle and capable of holding a tool on the spindle without a tool holder. The spindle of the spindle unit is provided with a tool receiving bore formed in the forward end portion of the spindle along the rotational axis thereof, one or more pressure chambers disposed around the tool receiving bore in spaced relationship from the tool receiving bore by a thin wall elastically deformable in a radial direction of the spindle, and a working fluid passage formed in the spindle and in fluid communication with the one or more pressure chambers. The spindle unit further includes a pressure adjusting device arranged in the rear portion of the spindle unit and connected to the pressure chamber through the working fluid passage.

Abstract: A tool is rotated by a spindle mounted on a Z-axis table carried on a column and moved in the direction of a Z-axis to process a workpiece, while moving an X-axis table supported on a column rising from a bed in the direction of an X-axis and moving a Y-axis table supported on the X-axis table in the direction of a Y-axis to move the workpiece supported on the Y-axis. By controlling the movement of the X-axis and Y-axis tables in a contouring manner to move the workpiece along any path, holes having various sizes and shapes can be made by one type of the tool. Moreover, the wear of a cutting blade of the tool can be compensated by correcting the path of movement of the workpiece.

Abstract: The present invention comprises an improved R-8 collet for insertion and attachment within a spindle of a milling machine. The R-8 collet comprises an elongated member having a first end of generally conical configuration with a bore arranged longitudinally therein. The R-8 collet has a second end with a gripping head thereon, for securement to a spindle in the machine. The gripping head comprises an enlarged member with a narrowed portion for gripping the R-8 collet within the spindle.

Abstract: A replaceable cutting head is adapted for co-axial coupling thereof, along a coupling axis, with a tool shank in a self-clamping fashion. Both the cutting head and the tool shank have a mounting portion comprising a centering section and a positioning section. The centering section is formed with a peripheral centering surface which extends circumferentially with respect to the coupling axis and has a substantially conical shape at least at two portions thereof. The positioning section has at least two peripherally disposed and circumferentially extending and spaced apart positioning surfaces adapted for the provision of an axial support of the cutting head on the tool shank. Each positioning surface is inclined with respect to the coupling axis so that an axial distance therefrom to a broad end of the peripheral centering surface increases in a direction generally corresponding to the direction of cutting forces acting on the cutting edge during a cutting operation.

Abstract: A two-surface constrainable tool has two retaining surfaces by which the two-surface constrainable tool retains itself on a spindle (10) of a machine tool. The two-surface constrainable tool comprises: a bottom grip taper shank (14) having a taper part (15) having a first retaining surface and capable of being closely fitted in a taper bore (12) formed in the spindle (10), and a flange (16) provided in one end surface (16a) thereof facing the end surface (10a) of the spindle (10) with a groove (18); and a collar (20) to be interposed between the end surface (16a) of the flange (16) and the end surface (10a) of the spindle (10), consisting of two symmetrical segments (20a, 20b) having ridges (22a, 22b) to be fitted in the groove (18) of the flange (16), and a second retaining surface to be brought into close contact with the end surface (10a) of the spindle (10). The bottom grip taper shank (14) retains itself by the first and the second retaining surface on the spindle (10).

Abstract: A description is given of a set (10) consisting of a spindle (1) and tool (2) for machining operations to remove shavings by means of rotation, wherein the clamping of tool (2) is accomplished by the action of centrifugal force acting on one or more of the parts that comprise the set, whereby said spindle (1) ends in a cylindrical cavity (3), inside of which is coaxially secured a cylindrical member (5), whose part that faces tool (2) has one or more diametral cuts (6) that divide it into two or more symmetrical portions (5s, 5t) that are able to bend outward in the radial direction under the action of centrifugal force, and wherein tang (7) of said tool (2) ends in a hollow cylindrical tube (7e) that is able to accommodate at least part of said portions (5s, 5t) of said cylindrical member (5), the walls of which have a thickness (S) that is equal to distance (D) between interior wall (3k) of said cylindrical cavity (3) of spindle (1) and the exterior wall of said cylindrical member (5), whereby during the ab

Abstract: An automatic spindle arresting device for hand tools, especially for drills, drill screwdrivers, angle grinders and the like, with a latching part (50; 120), which is connected to the spindle (20) or the housing (10) so that there cannot be any mutual rotation, and which can be coupled in both direction of rotation of the spindle (20) with at least one arresting part (40; 140), which is connected with the housing (10) or the spindle (20) so that there cannot be any mutual rotation, and with a driving part (34; 110), which is disposed equiaxially to the spindle (20) and has unlocking elements, by means of which the latching part (50; 120) and the arresting part (40; 140) can be uncoupled, is characterized in that the unlocking elements are one or more control paths (38; 116), which are disposed at the driving part (34; 110) and at which one or more control cams (54; 124) of the latching part (50; 120) slide due to a rotational motion of the driving part (34; 110) in such a manner, that the latching part (50; 1

Abstract: A clamping apparatus for detachably connecting a tool unit to a tool supporter with increased holding force is provided. The clamping apparatus includes a housing, a pair of opposing locking spheres within the housing, a cylindrical canister member mounted within the housing that is matable with an insert-supporting tool unit and which has a pair of opposing apertures in its sidewalls for conducting the locking spheres from a locking to an unlocking position, and a lock rod reciprocally movable within the interior of the canister member along an axis A and having opposing cam portions for radially moving the locking spheres through the canister apertures into wedging engagement with opposing angled walls of sphere receiving openings in the tool unit.

Abstract: Tool extension and stability in milling machines is enhanced by providing a spindle extension having a housing attached to the mill head and an arbor rotatively mounted in a bore formed in the housing. The arbor, which is significantly longer than conventional arbors, is supported by first and second bearing assemblies and includes a substantially cylindrical body portion with an integral shank formed on one end thereof for connecting the arbor to a machine tool spindle. A cutting tool is attached to the other end of the arbor.

Abstract: A boring tool for use with compacted graphite iron materials includes at least one self-propelled rotating cutter insert. The insert is carried in a cartridge in which the insert is rotatable about is axis which is a secondary axis relative to a boring tool body in which the cartridge is mountable and which is rotatable about a primary axis. In the tool, the insert has its cutting point most distant from the tool axis that is the location at which axial and radial rake angles are defined to assure that the insert rotates during boring about its axis in the correct direction and at sufficient speed to assure cooling of the insert.

Abstract: Upper-and-lower cutouts (25a) and right-and-left cutouts are formed in a flange portion (23) of a holder main body (12). In a fore portion of the outer circumference of the flange portion (23), is provided a first operation ring (41), which is urged rearward by a compression spring (42). A taper portion (44) inwardly slanted as viewed toward the rear as well as a straight portion (45) are formed in the operation ring (41), and a drive key portion to be fitted to the key way of the spindle through the right-and-left cutouts are provided on both right and left sides of a rear face (45a) of the straight portion (45). In the rear of the operation ring (41), is provided a second operation ring (51) via two spacers (52).

Abstract: The present invention relates to an improved spindle. The spindle uses improved shrink fit technology. This spindle is heated by means of an electric heating coil. This causes the internal diameter of the spindle bore to expand large enough to fit a toolholder that is manufactured to the predetermined size of 0.0015 per inch of diameter larger than the internal diameter of the spindle bore when both are measured at room temperature. After the toolholder is placed in the spindle a refrigerant blast cools the internal diameter of the spindle bore. This causes the spindle to grip the toolholder in an extremely rigid fashion having a desirable effect on the overall concentricity of the toolholder. The improved shrink fit technology is apparent when removing the toolholder from the spindle. The toolholder is manufactured using a predetermined type of steel with a lower thermal expansion rate than that of the internal diameter of the spindle bore.

Abstract: A power rotary tool has a drive spindle and a chuck device mounted on the end of the spindle. The chuck device has a body member with an axial bore through an end thereof that defines a female pilot section and a threaded longitudinal section adjacent and rearward of the female pilot section. A flat shoulder is defined on the body member rearward of the threaded longitudinal section. The drive spindle has a male pilot section at a forward end thereof and a threaded longitudinal section adjacent and rearward of the male pilot section. A radial stop is defined on the drive spindle adjacent and rearward of the threaded section. Upon mounting of the chuck onto the drive spindle, the male pilot longitudinal section slides tightly within and uniformly contacts the female pilot longitudinal section and the shoulder of the body member abuts directly against the radially extending stop defined on the drive spindle.

Abstract: A cutting tool chuck comprises a spindle provided with a tapered bore having the shape of a regular hexagonal prismoid for receiving a shank of a tool holder or a cutting tool, a retainer placed in the tapered bore of the spindle, and a plurality of rollers held in place by the retainer so as to be in rolling contact with the surfaces defining the tapered bore and the surfaces of the shank. The retainer has a plurality of retaining ribs extending along ridge sections of the tapered bore, an upper connecting ring to which the upper ends of the retaining ribs are joined, and a lower connecting ring to which the lower ends of the retaining ribs are joined. Each roller has a pair of projections at its opposite ends, and the rollers are supported for rotation at their projections on the retaining ribs.

Abstract: The invention relates to a procedure for the fastening of objects, e.g. working tools and work pieces, and to a holding device. The invention comprises a self-locking holding collet (2, 22) which fastens the object by means of an actuating element (3) which moves the holding collet to fasten and unfasten the object.

Abstract: A double cutting spindle unit comprising a main spindle unit and a sub-spindle unit mounted on the main spindle unit and vertically slidable relative to the main spindle unit. The chucking member is normally biased toward its fastening direction by a fastening spring formed by a plurality of spiral belleville springs arranged around the chuck actuating shaft. A two-stage hydraulic cylinder comprising two coaxially arranged cylinders is mounted on a supporting frame arranged on the top cover, and the actuating rod of the hydraulic cylinder is arranged with its free end being opposite to the end of the chuck actuating shaft.

Abstract: A device for holding and securing a rotating tool to be attached to the spindle shaft of a machine tool, that can realize ultra-precise cutting or grinding work under conditions of high rotation speed and rapid feeding. A tool holder consists of an outer cylinder having a tapered outside peripheral surface which comes into contact with the inside peripheral surface in a tapered hole of a spindle shaft; an inner cylinder which fits in such a manner that the outer cylinder can slide in an axial direction; a retainer having an outer armor which is formed at the front end of the inner cylinder and can contact the top end of said spindle shaft; and an elasticity-accelerating member which imparts elastic force to the retainer such that the outer cylinder can move towards its base end.

Abstract: A hollow cone device for gripping attachments, essentially constituted by a bit-carrying socket (1) for blocking the member (2) to be fixed, prolonged by a securement element (3) in a support (4), such as a spindle or the like. The securement element is in the form of a screw-threaded element connected to the socket (1) and screwed into the support (4). The bit-carrying socket (1) comprises two radial recesses extending perpendicularly to its axis and in which are mounted two gripping bits (5) actuated simultaneously, to slide radially in a symmetrical manner, by a screw (6) maintained in translation by a stud screw (7) co-acting with a circular throat provided in the central region of the screw (6). An ejector (12) is guided in translation in a bore in the bit-carrying socket (1) and actuated by symmetrical pressure of the bits (5). The device also includes an element (15) for relative angular displacement between the bit-carrying socket (1) and the screw-threaded element.

Abstract: The present invention comprises a quick-change tool system for a collet in alignment with a spindle of a milling machine. The collet comprises an elongated member having a first end of generally conical configuration with a bore arranged longitudinally therein. The collet has a second end for securement to a spindle in the machine. The quick charge tool system comprises a tightenable securement coupling for securing a tool in the collet and also for aligning the collet and a tool within the spindle. Subsequent requirement for re-adjustment of the "Z" axis coordinates of the tool within the collet and with respect to the spindle is eliminated.

Abstract: An Improved Collet Assembly and Manufacturing Process is disclosed. Also disclosed is an improved collet that includes a spindle, a center portion comprising several tabs and a collar. The disclosed collet is manufactured from a single piece of stock, and as such, that the tabs are formed from this unitary piece. The disclosed collet is inserted into a collet housing that is further defined by a bore in its center. The preferred collet housing bore is further defined by a sloped portion that cooperates with the tabs formed on the collet to restrain a burr shaft from rotational or axial movement. The collet assembly of the present invention provides improved balance and therefore wear properties over previous collet assembly. In particular, the disclosed collet assembly is well suited for application inside a cannister assembly of a air-powered dental tool handpiece.

Abstract: High speed machining of parts is greatly enhanced when the axial alignment between the machining tool, its tool holder assembly, and a tool driver assembly can be precisely maintained, preferably within about one ten thousandths of an inch, in order to achieve the utmost in machining precision in the parts being machined. In order to maintain this desired degree of alignment, the machining tool is mounted in an angularly adjustable holder assembly which mates with a complementary socket that forms a part of the tool driver assembly. The tool holder assembly can also be used to move the tool radially sideways in a rectilinear fashion relative to the tool driver assembly, if desired. The tool holder assembly, besides being able to adjust the alignment of the tool relative to the tool driver assembly, is also operative to securely clamp the tool to the tool driver assembly.

Abstract: The present invention relates to a tool/collet alignment and securement arrangement for a vertical milling machine having a J-head and a manually adjustable spindle for the secure and rapid change of a tool held in a collet in a lower end of the spindle. An arrangement of receiving bores are spaced annularly around the lower end of the spindle. An arrangement of locating pins are correspondingly arranged about the tool/collet so as to mate with the receiving bores in the spindle, to provide secure and efficient engagement of the collet/tool with the spindle in the vertical milling machine.

Abstract: A spindle assembly has inner and outer coaxial shafts having front and rear ends and extending along a common axis with the inner shaft axially displaceable in the outer shaft, a holding assembly on the front ends adapted to grip a tool or workpiece in an axially forwardly displaced position of the inner shaft relative to the outer shaft, a coupling ring fixed on the rear end of the outer shaft, and an actuator having a piston axially engageable with the rear end of the inner shaft and operable to axially shift the inner shaft in the outer shaft. In accordance with the invention complementarily interengaging formations on the actuator and the coupling ring including a groove and a projection are displaceable between a holding position axially securing the ring on the actuator and a freeing position allowing the ring to be axially separated from the actuator.

Abstract: A tool mount for a tool holder having a tubular collar with an inwardly projecting rim has a shaft centered on an axis and formed with an axially centered main bore having an outer end formed as a seat complementarily engageable around the collar and a transverse bore crossing the main bore. An actuating bolt in the main bore has a head engaged in the collar in the seat and is formed with a transverse bore aligned with the shaft transverse bore. A retaining element is engageable between the bolt head and the holder rim and the bolt is axially displaceable between an inner position pressing the retaining element radially outward into locking engagement with the holder rim and an outer position with the retaining element retracted radially inward out of locking engagement with the holder rim. An ejector sleeve axially displaceable on the bolt in the bore is axially outwardly engageable with the holder collar in the seat.

Abstract: An improved coupling system for lockably coupling machine tool components is provided that includes a male coupling, a female coupling having an axis, a pair of opposing jaw members having lock surfaces for engaging ledge surfaces in the male coupling when the jaw members are moved apart, and a drive train having first and second drive spheres for simultaneously moving proximal and distal ends of the jaw members apart. The drive spheres engage ramps on the inner surfaces of the jaw members that have cylindrical profiles to provide lenticular contact between the spheres and the jaw members. Cam and follower surfaces are provided between the jaw members and one of the male or female couplings to enhance the locking force between the couplings. The invention provides a more rigid coupling between the male and female components by providing two locking spheres that operate in tandem to simultaneously spread the distal and proximal ends of the jaw members apart.

Abstract: A milling cutter is provided with a base body that can be driven in a rotating manner around its longitudinal axis. Support bodies are distributed over the surface of the base body and are supported from centrifugal forces by a base body stopper and are positioned in tension against the base body stopper. The base body has an end face with a central area and a peripheral area around the central area, which central area is recessed with respect to the peripheral area. The central area and peripheral area together forming a step which acts as the base body stopper. The support bodies comprise a counter-step which can interlock with the base body, and a mounting plate is positioned at the end face to support the support bodies.

Abstract: A spindle apparatus comprises a main shaft mounted for rotary movement, a rotating device for rotating the main shaft about an axis, a vibration device for vibrating the main shaft, a detecting device for detecting a displacement of the main shaft when the main shaft is vibrated by the vibration device and providing an output signal indicative of the displacement of the main shaft, a calculating device for calculating an allowable revolution speed of the main shaft on the basis of the output signal of the detecting device, and a drive source for driving the rotating device to rotate the main shaft within a speed range which does not exceed the allowable revolution speed. When an end of the main shaft is vibrated by the vibration device, a displacement of the vibrated main shaft is detected by the detecting device which provides an output signal indicative of the detected displacement.

Abstract: An apparatus and method for securely, mechanically retaining an elongated tool holding arbor in the tapered bore formed in the spindle of a conventional, rotatable, power driven spindle machine. The arbor is mechanically secured to the spindle by bridging it to a key via a threaded fastener. The arbor includes a longitudinal hole formed therethrough having at least first and second concentric passageways of different diameters. The rectangularly shaped key is sized to be operatively received within and set upon shoulders formed by first and second diametrically opposed openings formed through the spindle. The key includes a tapped hole formed centrally, transversely therethrough. The arbor may be inserted into the spindle's bore, and a fastener having an enlarged head and a threaded shaft may be inserted through the arbor's hole with the threaded shaft passing freely through both first and second passageways, and the head passing through the first passageway but not the second.

Abstract: A face-driver assembly and method for accurate coupling of a face driver with the spindle of a rotary-drive machining device. The assembly includes a face driver, a hub on the spindle defining a prealignment bore, a pair of self-centering coacting tooth sets on the hub and face driver, an engagement post extending into the hub and forming a prealignment shaft closely complementary to the prealignment bore, and a releasable coupling to hold and draw the engagement post rearwardly and thereby join the tooth sets in a manner facilitating final accurate centering.

Abstract: A spindle device for detecting the completion of an automatic tool changing procedure comprising a spindle (11) having a tool holder support portion (22) formed at the forward end thereof, a drawing bolt (17) with a through-hole (18) through which an air is blown in the vicinity of a tool holder support portion (22) of the spindle (11) for cleaning in the automatic tool changing procedure, and a pressure detection means (21) disposed in association with the through-hole (18) of the drawing bolt (17), wherein whether or not a tool holder (9) is suitably mounted on the tool holder mounting portion (22) is judged on the basis of an air blow pressure detected by the pressure detection means (21).

Abstract: A method for automatically removing a tool from a rotational shank shaft of a three-dimensional robot by indexing the shank shaft, disposing a tool tightening member provided in connection with the indexed shank shaft to a releasing device by movement of the robot, the releasing device being disposed during this operation inside the movement range of the robot; using the releasing device to release the tool; and removing the tool from the shank shaft of the robot by a movement of the robot.

Abstract: A short-stroke clamping apparatus for detachably connecting a tool unit to a tool supporter is provided of the type having a canister member which includes apertures for admitting spherical locking elements, and a lock rod that is reciprocally movable a stroke distance along an axis and which has cam portions for moving the spherical locking elements through the canister apertures into engagement with the tool unit. In the clamping apparatus, the canister member apertures are elongated along the stroke axis. This allows the spherical locking elements to move axially along the cam portions of the lock rod as well as radially, such that locking engagement can be achieved with a shorter axial stroke movement of the lock rod. The aperture walls may also be angled to allow even greater axial movement of the locking elements, which not only further shortens the lock rod stroke, but can increase the gripping force that the clamping apparatus applies to the tool unit.

Abstract: Apparatus for cutting a workpiece includes a rotatable cutting tool, a rotatable spindle for rotating the cutting tool, and a quick-connect and disconnect kinematic coupler for releasably coupling together the rotatable cutting tool and the rotatable spindle. The kinematic coupler includes a plurality of projections which cooperate with and enter a corresponding number of grooves to precisely place the cutting tool relative to the spindle and prevent relative movement between the cutting tool and the spindle.

Abstract: An apparatus is disclosed for receiving a rotary body (412) in a centered and axially fixed manner, in particular a grinding wheel, on a supporting part (410) with an axial centering spike (418) which projects in to the central opening (416) of the rotary body (412) and a substantially radial collar (480) adjacent thereto, against which the rotary body (412) may be axially clamped. In order to allow extremely rapidly rotating bodies (412) to be clamped extremely accurately with simple hand grips, an elastically expandable, preferably thin-walled axial extension (440) is arranged between the centering spike (418) and the opening (416). The axial extension (440) is supported on the outer surface of the centering spike (418) and on the inner surface of the opening (416) and together with a clamping plate (436) forms a single adapter piece (434).

Abstract: A mounting apparatus for securing alternative grinding wheels to a threaded portion of an output shaft of a portable rotary grinding machine, the mounting apparatus comprising a threaded clamping device which cooperates with the threaded portion of the output shaft; a support hub which rigidly mounts on the output shaft, the support hub having an inner annular contact surface and an outer annular contact surface for backing grinding wheels mounted on the output shaft. The inner and outer annular contact surfaces are disposed concentrically relative to each other as well as relative to the output shaft, and the inner and outer annular contact surfaces are disposed at different axial levels such that the outer annular contact surface protrudes in front of the inner annular contact surface.

Abstract: A toolhead assembly for a machine tool generally consisting of a housing supportable on the machine tool and having at least one elongated bore therein, a liner formed of a structural polymer material disposed in the bore, adhesively secured to the housing and having a cylindrical inner wall surface, a spindle shaft journal in the housing and disposed coaxially in the liner for axial displacement therein, the spindle shaft having a head section rigidly mounted on the spindle shaft and engagable in sliding relation to the liner inner wall to provide fluid chambers on either side thereof, means for injecting fluid under pressure selectively into the chambers for axially displacing the spindle shaft, means for spinning the spindle shaft about its axis and means for securing a tool bit to the spindle shaft.

Abstract: A spindle apparatus capable of exhibiting a good interchangeability of a tool holder without any necessity for managing a gap between an end surface of the tool holder and an end surface of a spindle shaft and, besides, obtaining a high tool holding rigidity. Small- and large-diameter portions are formed in the outer surface of the spindle shaft having a taper hole formed in the shaft end. A sleeve formed with a fluid passageway communicating with the outside is fitted, with interferences, to the outer surface thereof. On the other hand, a flange having a diameter larger than a taper shank is provided at a proximal portion of the taper shank of the tool holder. A fluid pressure is applied to the fluid passageway of the sleeve, thereby making the sleeve contact with the flange of the tool holder that is fitted to the spindle shaft. Thereafter, the sleeve is fixed to the spindle shaft by removing the fluid pressure, and the tool holder is supported with a high rigidity.

Abstract: A coupling system (1) is provided for lockably coupling together machine tool components that comprises a male coupling (3) having a recess (19) at a distal end that includes follower surfaces (24), and female coupling (9) having an opening (31) disposed along its longitudinal axis for receiving the distal end of the male coupling (3), and a pair of opposing jaw members (12) pivotally mounted in the opening (31) and having cam surfaces (44) engagable with the follower surfaces (24) of the male coupling (3).

Abstract: This invention provides a tool clamping/unclamping device which allows a tool to be replaced simply and securely by another one in short time, and which prevents a lock nut from being loosened, from yielding a difference in phase, and from dropping off with respect to a main shaft. The tool clamping/unclamping device comprises a tool urging means for holding a tool holding member in its clamped state, a nut positioning means for adjusting the lock nut in its phase in rotation angle position with respect to the main shaft, a nut drop-off preventing means for regulating the amount of rotation angle of the nut, a nut loosening detection means for detecting the position of the nut in the direction of the main shaft, and/or a locking mechanism for engaging a steel ball urged by a spring with a lock hole to thereby lock the lock nut in the direction of rotation.

Abstract: A universal spindle head device for machine tools, comprising a spindle head with a main spindle, a built-in motor, a first rotating spindle with the end fixed to said spindle head and appearing an inclined angle of 45 degrees toward the main spindle of the machine tool, and its center having a hollow passage; a second rotating spindle with its center axial line located on identical plane to center axial line of said main spindle and first rotating spindle and appearing at an inclined angle of 45 degrees toward the spindle center of the first rotating spindle; and a drive device for driving the spindle head to enable it to rotate centering around the first rotating spindle and second rotating spindle and to change over in direction in order to perform five-side processing of workpiece.

Abstract: A tool holder coupling apparatus for attaching a tool holder to a machine spindle, has a tool holder which includes a support portion and a pull stud bolt. The support portion has a tapered surface portion of relatively large diameters, a straight portion of a relatively small diameter near the pull stud bolt, and a relief portion between the taper portion and the straight portion. The machine spindle of the coupling apparatus has a hollow interior defined by a tapered reception interior surface portion corresponding to the tapered surface portion of the tool holder, a straight interior surface portion corresponding to the straight surface portion of the tool holder, and a middle interior surface portion between the tapered surface portion and the straight surface portion. The tool holder attaches to the machine spindle in such a manner that the relief surface portion of the tool holder is spaced from the middle surface portion of the machine spindle.

Abstract: The present invention is a tool holder and quick change adaptor which permits very tight tolerances to be kept when operations are being performed while at the same time permitting quick change of the tool holder. The tool holder and quick change adaptor of the present invention employs a cone and conical recess which are dimensioned such that the two mate with surface to surface contact without locking and provide limited deflection of the tool for precise tool operation.

Abstract: An mounting arrangement of a tool holder in a machine tool comprises a main shaft and the tool holder each having an extending end face formed by extending a given reference end face of the main shaft and a given collar end face of the tool holder, toward one another, respectively, both of which end faces are normally separated with a prescribed clearance, with required extensions so as to come into contact with one another when a tapered shank of the tool holder is fitted into a flared hole of the main shaft, so that the tool holder can be mounted in the main shaft securely owing to a high degree of integration, without the occurrence of friction due to the phenomenon of a fretting corrosion or the like in the contact surfaces between the flared hole and the tapered shank. Such a high degree of integration of the main shaft and the tool holder enables a deep cutting to be readily performed in relation to a workpiece.