Abstract: A tool holder for a gun drill or reamer has internal and external cylindrical rear end pilot portions and a radial pilot flange for precisely connecting coaxially with a rotatable and axially moveable power source. A sleeve confined coaxially within the internal cylindrical portion has an axially extending flat spline surface for effecting driving engagement with a mating flat of a tool shank. A contractible conical split collet at the forward end of the holder coaxially clamps the tool shank when moved axially to a clamping position by means of a non-rotatable nut secured to the collet for cocking out of axial alignment therewith to assure precise coaxial clamping of the tool shaft. The nut is in screw threaded engagement with a rotatable and non-axially moveable collar provided with beveled gear teeth for rotation by a Jacobs type tool.

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: A memory is built in a tool holder to which a working tool such as drill or the like is attached. Various tool information such as kind of tool, dimensions of tool, tool use time, and the like is written into the memory. The tool holder having the memory therein is coupled with an external unit by contactless coupling means which doesn't need any electrical coupling, thereby allowing the tool information to be written into or read out of the memory. The information is transmitted between the memory in the tool holder and the external unit by way of the optical or magnetical coupling. The memory built in the tool holder consists of a non-volatile memory such that the memory content is not erased even if the power supply is shut off.

Abstract: A quick-change mechanism is provided between a male member and a female member which has a socket with an axis. A flange is provided on each member, and in the flange of the female member an eccentric circular cam is pivotably mounted on one side of the socket. The cam may be pivoted through an arc between a locked and an unlocked condition in a single plane. The unlocked condition moves the cam laterally outwardly beyond the cam follower surface in the male member. As the cam is rotated towards the locked condition, the cam locking surface moves in a single plane laterally inwardly and establishes an axially inward force on the cam follower surface. The quick-change mechanism is small and compact and contained entirely within the flange of the female member. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Abstract: An over-spindle quick-change assembly for releasably securing a tool holding adapter at an operative position with respect to a power rotatable shank spindle comprises a cylindrical sleeve sleeved over the tool holding end of the spindle. A collar rotatable on the sleeve has a threaded portion engageable with a nut on the adapter for screwing the nut and adapter to the operative position, whereat confronting annular surfaces of the nut and spindle end engage each other in sealing relationship. The sleeve is prevented from relative movement on the spindle by a set screw screwed radially into the spindle shank and having a reduced diameter extension confined within a radial hole in the sleeve. The threaded portion of the set screw is dimensioned to prevent its entry into the radial sleeve hole.

Abstract: An improved collet tool holder is disclosed characterized by use of formed cam surfaces upon the collet and tightening sleeve of the tool holder. Selective rotation of the sleeve relative to the collet causes selective, ramping, engagement of the complementary cam surfaces which causes selective compression of the collet to securely grip a cutting tool. The collet's internal aperture may optionally present a formed cam surface which engages a complementary cam surface formed upon the shank of the cutting tool.

Abstract: A clamping device for workpieces or tools with a high concentricity utilizes a shank part supported in a cylindrical borehole of a base body, and an adjusting device disposed in the support area of the shank part includes several tapped holes, especially tapered tapped holes in the base body, which are distributed in a radial plane, as well as tapered bolts which can be screwed into the tapped holes.

Abstract: A multi-component chucking system, in particular for concentric or true-rotation tools, has a recieving body (1) optionally having a chucking shaft, with an engagement surface (8) extending at right angles to the axis of rotation (2) and a coaxial retention bore (7) as well as a tool element (9), preferably embodied as a tool holder. On its end face, the tool element also has an engagement surface (11) at right angles to the axis of rotation and is formed with a coaxial retention stub (10) fitting into the retention bore (7), by means of which stub the tool element can be centered with respect to the receiving body. A chucking pin (18) associated with the retention stub and coaxial with the axis of rotation, along with chucking means actuatable from outside the receiving body, allows the clamping together of the tool element and the receiving body.

Abstract: A milling cutter having an internal thread in the end face of a shank thereof for preventing accidental detachment, wherein a small-diameter thread part provided in one end of an adapter is screwed in to the internal thread set forth above while a large-diameter thread part, or a large-diameter rod part provided in the other end of the adapter is screwed in to an internal thread, or inserted into a hole respectively arranged on the axis of a chuck, the rod part being secured with a set screw.

Abstract: A chuck for a cylindrical rotary metal cutting tool, such as an end mill, is provided with a liquid coolant system. The chuck is constructed to direct cooling liquid onto a cutting tool secured in an axial bore defined therein with a plurality of converging liquid streams directed at the tool. The chuck is constructed with alternative passageways. Liquid coolant may be directed along a central, axial cooling liquid passageway remote from a transverse end face of the chuck. Liquid may pass radially outwardly therefrom through radial bores and into intersecting longitudinal cooling liquid distribution ducts which are inclined toward the axis of the tool holder and which terminate in outlet ports in the end face. The radial bores are plugged at locations radially outwardly from the intersection of the ducts with the radial bores.

Abstract: A quick change tool holder having a cutting head on which a cutting member is attached for attachment to a shank. A lockpin/locknut arrangement provides for quick and safe removal of the cutting head from the shank. The lockpin has radial projections that rotate in response to manual rotation of the lockpin in and out of recesses contained in the opening of the locknut. The lockpin is secured within a bore in the cutting head and extends out of that bore into a bore in the shank in which bore the locknut is secured. A spring and plunger combination is located in the bore of the shank in order to urge the cutting head away from the shank when the radial projections are not within the recesses of the locknut. The shank and the cutting head have corresponding mating teeth in order to prevent rotation of the cutting head relative to the shank when the cutting head and shank are attached.

Abstract: A tool-mounting assembly includes a tool head having a receiving bore and a basic tool holder having a receiving pin that is shaped for insertion into the bore. The bore has a groove with a sloping surface and the receiving pin includes movably mounted clamping elements having lugs. The assembly also includes a clamping device in the form of a screw with left-handed threads that engage one clamping element and right-handed threads that engage the other, so that the clamping elements can be moved away from each other to force the lugs into the groove and thereby clamp the tool head to the basic tool holder. In another embodiment an axially movable push rod is used as the clamping device to force the clamping elements away from each other.

Abstract: For correcting axial errors of a tool, the latter is held by a two-part tool holder, whose two parts are reciprocally displaceable by a setscrew along their engaging interfaces at right angles to the axis. For this purpose, the locking screws of a flange connection are correspondingly loosened. The axial correction can be simply and rapidly performed, in that the setscrew is provided on a setting ring rotatable about the axis.

Abstract: A pull stud detachably attached to a tool holder includes a tool data storing element for storing tool data. The arrangement being such that tool data of each tool can be stored in the tool data storing element within the pull stud attached to the tool holder holding the tool.

Abstract: Manually adjustable pivot head for a rotary boring bar having a spring steel mounting plate with two opposed arcuate slots terminating in yieldable webs extending between a rigidly mounted outer ring and deflectable central portion on which an annular flange of the boring bar is secured. A manually adjusted screw effects adjustment deflection of the central portion.

Abstract: A machine tool spindle (1) serving to receive toolholders (13) with different shanks (8, 16) by turns has a frustoconical receiving bore (3) in its head (1a) for receiving a steep-angle taper shank of a first toolholder. The spindle head (1a) is provided with an end face (4) surrounding the frustoconical receiving bore (3). Immediately adjoining this end face there is provided a first nesting bore (8) whose diameter (D) is slightly greater than the theoretical diameter of the frustoconical receiving bore (3) in the plane of the end face (4). The axial length of the nesting bore (8) is only about 10-15% of the theoretical diameter. The nesting bore (8) serves to receive a first cylindrical nesting shoulder (15) of the second toolholder (13). At the inner end of the receiving bore (3) there is provided a second nesting bore (40) into which a second nesting shoulder (41) is arranged at that end of the toolholder (13) which is located in the spindle fits.

Abstract: The present invention provides an apparatus and method of utilization of the same of a quick change tool coupling for a rotational metal working or like machine. The present invention provides a tool holding coupling for use with machines with an automatic tool exchanger. Use of the present invention allows the elimination of the drawbar mechanism commonly used in standard metal working machines, while providing axial bending rigidity for the tool.

Abstract: A quick-release tool holding device as a tool holder formed of a sleeve and a shoulder having an undercut annular tapered surface, with a tool holder retaining head that has a cylindrical bore into which the tool holder sleeve fits, with the tool holder shoulder abutting against an end of the sleeve. The retaining head has a quick-release retainer mechanism in which a plurality of button members releaseably engage the tapered surface of the tool holder. These button members are moved by rotating an annular collett or ring which induces cam action of the buttons into and out of engagement with the tool holder. This quick-release tool holder mechanism is favorably employed in a multiple spindle mechanism mounted on a tooling machine.

Abstract: The collet includes a compressible basket having a central opening to receive a tool shank and two exterior surfaces tapering in opposite directions. One tapered exterior surface engages a matching tapered interior surface of a hollow rotatable shaft that receives it. The other tapered exterior surface engages a matching tapered interior surface of a wedge received in the shaft and movable axially relative to it. The angles of the tapers are such that they are self holding. The collet is closed by moving the wedge which compresses the basket sequentially at the two tapered surfaces, locking the tapers. The force on the wedge is released after this, leaving the tapers locked without external force as the tool is gripped in two locations during operation of it.

Abstract: To produce a connection without play between the shaft or shank (3) of a tool head (1) and a corresponding bore (4) of a tool holder (2), the shank includes an abutment collar (5), an adjacent short conical portion (3a), a cylindrical pin portion (3b), and a guide portion (3c) at the end of the shank. The short conical portion adjacent the collar is slightly overdimensioned compared to a corresponding conical portion (4a) of the bore. When the shank is forced into the bore at least one of these parts is elastically deformed and the abutment of the shank comes into planar contact with an end face of the tool holder. The guide portion (3c) at the end of the shank may be either cylindrical or conical.

Abstract: The present invention relates to an improved toolholder for releasably mounting on a tool support member. The toolholder is provided with a forward end for receiving a tool and a shank extending from the forward end for being releasably received in a bore of a tool support member. The shank has a first section for interference fitting with the bore of the tool support member when a rearwardly facing face on the toolholder is in abutment with a forwardly facing surface on the tool support member. The shank has a second section, rearwardly of its first section, for expansible abutment with the bore of the tool support member.

Abstract: In the present invention a tubular toolholder shank is releasably held in the bore of a tool support member by a releasable locking mechanism mounted in the bore of the tool support member and receivable in the tubular toolholder shank. The locking mechanism has an actuating member radially extending through the wall of the tubular shank.

Abstract: A divided milling cutter comprises a first cutter half and a second cutter half which are adjustable in relation to each other with respect to their mutual distance and are both connected to a first, common, hydraulic sleeve which has an internal, annular pressure chamber and is threadable on to and securable to a cutter spindle or the like. To make possible a continous or step-less variation of the distance between the cutter halves in a simple way even when they are mounted on the cutter spindle said second cutter half is fastened to a second sleeve which is in threaded engagement with a third, threaded sleeve having a substantially annular flange which abuts an end of, or shoulder on, the first sleeve.

Abstract: A tool clamping device is provided for quickly and securely clamping rotary tooling adaptors to tool clamp blocks. The device is adaptable to semi-automatic or robotic tool switching operations and minimizes machine downtime.

Abstract: An apparatus for holding a tubular shank of a toolholder is provided with a tool support member bore for receiving the shank and first and second radially reciprocal movable clamping jaws for holding the shank in the bore. The movement of the clamping jaws is radially activated by rotation of a radially aligned differentially threaded member engaging both clamping jaws.

Abstract: The present invention relates to a tool coupling device comprising a coupling element (10) attachable to a machine tool and a tool adapter (11) intended to clamp a tool for chip forming machining. A plug (18) on the adapter (11) is related to a contact surface (30;38) that is intended to be in engagement with a corresponding contact surface (29;37) related to the coupling element (10), said engagement clamping the adapter (11) against the coupling element (10).

Abstract: The invention relates to a toolholder for holding a tool at one end and having a tubular shank at its other end for mounting it into the bore of a support member. The shank has at least two circumferentially spaced perforations in its tubular wall. Each of the perforations extends obliquely toward the front of the shank as it extends from the inner to the outer surface of the tubular wall.A locking element is located partially within each of said perforations and the recess formed by the inner surface of the tubular shank. An actuating mechanism is located within the recess to drive the locking elements outwardly against the walls, thereby expanding the rear of the tubular shank to lock the shank in the support member bore.

Abstract: A clamping device for releasably securing a tooling adaptor in a tool clamp block which includes a generally cylindrical member having an eccentric slot formed about the periphery of the member for engaging the tooling adaptor in the cylindrical member whereby when the cylindrical member is rotated the tooling adaptor is drawn into and secured within the tool clamp block.

Abstract: A system for marking and identifying objects, particularly work implements such as tools and work piece holders required in manufacturing processes, which has modules (4) with electronically readable markings, which modules (4) are to be arranged on the objects (1) to be marked, as well as an evaluating device having at least one pick-up capable of reading the markings. Each module contains at least one oscillating circuit (5, 6, 7) to produce a characteristic resonant frequency or resonant frequency combination. The number of different resonant frequencies or resonant frequency combinations provided corresponds to the number of different elements in the selected characterizing code, and the resonant frequency or resonant frequency combination of each module (4) is selected according to one of these frequencies or frequency combinations.

Abstract: A chuck allowing to mount a cutting tool on the spindle of a machine tool. The chuck includes an ahead projecting chuck cylinder provided on the one side of a chuck body in a mated fashion to each other, and a tightening rotary sleeve mounted through needle rollers outside the chuck sleeve, in addition, slits configured in the top end part of the chuck cylinder, wherein the rotation of the tightening rotary sleeve causes the slits to contract so that a cutting tool is gripped.

Abstract: The cutting tool comprises a cutting head and a holding shank and, for transferring the torque introduced on the cutting head during machining, faces are provided in a recess of the bearing surface of the holding shank on which engage the stop faces of the cutting head. A fixed connection between the cutting head and the holding shank is brought about by a threaded pin screwed into a tapped hole on the holding shank and which projects into a conical blind hole on the cutting head. As the torque is transferred in the vicinity of the bearing surface, the threaded pin is only loaded to the extent that there is a clearance-free connection between the cutting head and the holding shank.

Abstract: A coupling for connecting a tool head and a tool holder. The tool head is inserted with an at least partially conical receiving pin into a correspondingly configured receiving bore in the tool holder. Tool head and tool holder are actuated by clamping elements so that a contact collar on the tool head rests against the counterface of the tool holder. The clamping device is composed of a clamping slide which is movable in the longitudinal direction of the tool holder. In the front part of the clamping slide, movable clamping jaws are provided which cooperate with a pin fixedly disposed in the tool holder in such a manner that movement of the clamping slide initiated during insertion of the receiving pin into the receiving bore causes the clamping jaws to be pushed onto the pin and to thus grip behind an annular groove in the blind bore of the tool head, thus causing the tool head to be locked to the tool holder.

Abstract: An improved cutter head in a machine tool includes a cutter head main body, a cutter spindle that is rotatably supported by the cutter head main body and adapted to be rotatably driven, a cutter support carried by the cutter head main body so as to be rotatable and movable along the axial direction of the cutter spindle, and a support shaft that is rotatably supported by the cutter support so as to be coaxial with the cutter spindle. At the tip end of the support shaft is formed a collet section having an expansible and contractible diameter so that the tip end of the cutter spindle can be fitted in the inner circumference of the collet section, resulting in expansion of the diameter of the collet section, and a cutter can be fitted around the outer circumference of the collet section.

Abstract: The mounting body (1) of the boring tool, which is of a hub-like configuration, is provided, at locations which are diametrally oppositely disposed with respect to the axis of rotation (D) of the mounting body, with a respective mounting bore (3) with its axis (A) extending radially with respect to the axis of rotation (D), the mounting bore being surrounded by a respective abutment surface (4) extending perpendicularly with respect to the axis (A) of the mounting bore (3). A tool head (5) is provided with a fitting spigot (6) which fits into the mounting bore (3) and which is concentrically surrounded by an annular surface (7) extending perpendicularly with respect to the axis (A) of the fitting spigot. A respective intermediate portion can optionally be fitted between the mounting body (1) and the respective tool head (5), the connecting parts of the intermediate portion corresponding to those of the mounting body (1) and the tool head (5).

Abstract: In a quick change spindle adapter including a power rotated spindle having a bore adapted to receive a tool holder, a body secured upon the spindle and a retractable spring biased sleeve mounted on the body having a tapered inner wall. A tool holder mounting a tool projects into the body and has a shank loosely positioned within the spindle. A tapered collar on the tool holder extends into the body and is retainingly engaged by a series of spaced balls in the body with the balls projecting into engagement with the sleeve tapered wall retaining the tool holder and shank upon the spindle. The improvement comprises a conical recess within the end of the spindle defining an axial bearing and a centering cone on the tool holder is in snug engagement and axial registry with the bearing maintaining a self-alignment of the tool holder and spindle.

Abstract: A lathe-mounting apparatus defining a cylindrical core having an enlarged cylindrical termination at one end thereof and a separate slidably-mounted cone at the opposite end. The cone is adapted to slide onto the smaller end of the cylindrical core, the smaller end of the cone preceding the larger end, whereby a brake disk, or other similarly shaped cylindrical article, mounted on the cylindrical core between the enlarged termination and the cone, may be cut or resurfaced without significant vibration during rotation of the article.

Abstract: A rotary cutting tool holder and method for precise generation of a radial cutting bit under high speed settings includes a rotary housing having an axially mounted actuating bar, a cylindrical shank with attached cutting bit rotatably mounted in a second recess within the housing and extending outwardly from the bar axis. Coupling and engaging means are matingly disposed on the bar and shank for translating axial actuating bar movement into rotational shank movement for radial generation of the cutting bit.

Abstract: A releasable coupling especially for quick inter-changeable tool mounting purposes comprises a socket member, e.g. for mounting in a machine tool drive spindle and a spigot shown of taper form and received by a corresponding socket in the socket member. The socket member has a driving engagement with the spigot and a shank of the latter may consist of or carry any one of a variety of tooling. A collar movable between locking and release positions about the socket member has internal cam formation acting on retaining elements such as balls in bores through the socket member which balls engage an annular groove about the spigot to retain it in the socket. Release movement of the collar enables the balls to radially retract for withdrawal of the spigot.

Abstract: The present invention relates to an automatic tool assembly apparatus for a modular constituted tool. The automatic tool assembly apparatus has a tool stock unit for storing a plurality of types of modular constituted tools for a machine tool disassembled in units of modules, a tool transfer unit for assembling a predetermined modular constituted tool from a plurality of modules in the tool stock unit and conveying the assembled modular constituted tool from the tool stock unit, and a control unit. The tool stock unit holds the modular constituted tool disassembled in units of modules. The stock position of each module required for assembling a tool requested by the machine tool is indexed from a signal from the control unit. The modules are then sequentially positioned at the assembly position. The tool transfer unit has an assembly head which is movable in a direction to approach and separate from the assembly position in response to an instruction from the control unit.

Abstract: The present invention relates to a method for attaching a shell-type milling cutter wherein an area for fastening the shell-type milling cutter to its cutter arbor is increased to raise rigidity and attachment strength thereby making high-speed and heavy-duty cutting possible, so that the cutting efficiency thereof becomes substantially identical to that of an integral structure type milling cutter, besides exchange of the milling cutter can very simply be attained.The method for attaching a shell-type milling cutter according to the present invention is conducted by such a manner that the inside diameter portion of a shell-type milling cutter is formed into a tapered hole, and a bush is forcibly inserted in a gap defined between the tapered hole and a fitting shaft of a cutter arbor, whereby the milling cutter is fixed to the cutter arbor.

Abstract: A machine tool spindle, which serves for interchangeably receiving tool holders (13) having different shanks (8,16), has in the spindle head (1a) thereof a frusto-conical receiving bore (3) for the reception of a steeply tapered conical shank of a first tool holder. The spindle head (1a) is provided with an end surface (4) which surrounds the frusto-conical receiving bore (3). Immediately adjacent this end surface there is provided a mating bore (8), the diameter (D) of which is slightly greater than the theoretical diameter of the frusto-conical receiving bore (3) in the plane of the end surface (4). The axial length of the mating bore (8) is equal to about 10 to 15% of the theoretical diameter. The mating bore (8) serves for the reception of a cylindrical mating extension (15) of the second tool holder (13).

Abstract: A major-minor tool shank for a machine tool including a major tool shank for fitting a minor stool shank therein. One end of the major tool shank is a minor taper pot provided with a lock mechanism for locking the minor tool shank, the lock mechanism including lock pins installed in holes opening through the wall of the minor taper pot. A cylindrical tool grip and a sleeve cap cover the minor taper pot, and a coil spring is provided between the tool grip and the sleeve cap. With the aid of spring force, the inner end of the lock sleeve pushes the lock pins in the radial direction and the pins latch the pull stud of the minor tool shank to connect and hold the minor tool shank in the major tool shank. When the lock sleeve is pushed in the axial direction, overcoming the spring force, the lock pins are released from the pull stud of the minor tool shank. Thus, the minor tool shank can snap off the major tool shank.

Abstract: A chuck for a cylindrical, rotary, metal cutting tool, such as an end mill, is provided with a liquid coolant system. The chuck has a stationary, annular collar within which a tool holder rotates at high speed. An annular channel is defined between the collar and the tool holder and liquid coolant is pumped into the collar to the channel through an inlet on the collar. Internal ducts within the tool holder are directed inwardly at an angle from the annular channel toward an end face from which a rotary tool, such as an end mill protrudes. The ducts are also oriented at an angle corresponding to the helical spiral of flutes on the end mill and are radially aligned with troughs between the flutes. Liquid coolant, such as water, is forced from the annular channel through the ducts toward the troughs between the flutes. The liquid coolant travels all the way to the tip of the end mill to cool the bit and wash chips of metal therefrom with a minimum of water being thrown from the end mill by centrifugal force.

Abstract: A tool holder for supporting an end mill tool. The tool holder has a main body portion, a collet and a collar operable together to apply radial forces to hold the tool. The tool holder also has a threaded adjustment device operable with the tool to hold the tool in a predetermined axial position. A set screw is operable with the adjustment device to further insure against undesired axial movement of the tool.

Abstract: The present invention is a device for adjusting eccentricity of the design axis of rotation of a rotary tool (12) with regard to the axis of rotation of a drive spindle (10). The device includes male and female members (22, 24), one matable to each of the spindle (10) and the tool (12). The male and female members (22, 24) are adjustable relative to each other to vary the eccentricity and to maintain the tool (12) wherein it is not canted relative to the axis of rotation of the spindle (10).

Abstract: In a chuck comprising a holding cylinder having a tapered outer circumferential surface and an objective tool or an adapter for holding such a tool inserted therein, and a clamping cylinder rotatably mounted at a predetermined distance from the outer circumferential surface of the holding cylinder, a number of needle rollers being arranged in a plurality of stages along the entire circumference of a gap between the two cylinders to extend along a direction at a predetermined inclined angle .alpha. with respect to the common axis of the cylinders, and the needle rollers rotating and revolving upon rotation of the clamping cylinder, thereby contracting and recoverying the holding cylinder, slits are formed in the holding cylinder to allow elasticity of the holding cylinder and to improve oil throwing performance and clamping force of the holding cylinder. The slits will not interfere with smooth rotation of the needle rollers.

Abstract: A router bit having an adjustable blade for cutting various widths of grooves includes a mechanism for maintaining static balance about the axis of rotation for all positions of the cutting blade within the range of adjustment. The router bit includes a main body adapted to be held and rotated by a chuck, and which includes a bore whose axis is parallel to but displaced from the axis of rotation of the main body. An arbor with an offset cutting blade is adjustably mounted in the bore, and the width of the groove is determined by the angular position of the arbor within the bore. However, such adjustment alters the static balance of the router bit about its axis of rotation. In accordance with the present invention, this source of unbalance is compensated by providing a counterweight whose position is dependent on the angular position of the arbor within the bore. In the preferred embodiment a cam on the shaft of the arbor bears against and determines the position of the counterweight.

Abstract: A tool support, or an extension or reduction part holding a tool support, is held by its shank in an axial bore of a socket of the tool-holding device. The socket has one or more further bores, the longitudinal axes of which each form an angle of from 0.degree. to about 5.degree. with a straight line perpendicular to the longitudinal axis of the socket. A setscrew disposed in one such further bore cooperates by means of a beveled or faceted surface at its lower end with a chucking surface running on the outside of the shank at an angle to the longitudinal axis thereof. Another setscrew may cooperate with a second such chucking surface forming an angle of about 45.degree. with the first chucking surface.

Abstract: A holder for a rotary cutting tools has a holder body fixed to a spindle of a machine tool. A rotatable shaft concentric with the holder body and having a tool-mounting portion at one end thereof is coupled at its other end portion to the holder body to receive torque from the holder body. The rotatable shaft is so mounted as to be radially displaceable and inclinable relative to the holder body. A positioning member is fixedly disposed on the machine tool body radially outwardly of the spindle. A cylindrical casing disposed radially outwardly of and rotatably engaged with the rotatable shaft such that the casing and the shaft are rotatable relative to each other, the casing being engageable with the positioning member for accurate positioning thereof by the positioning member, and thereby positioning the rotatable shaft.

Abstract: A tool holder for holding a rotary cutting tool, attachable to a spindle of a machine tool, has a holder body fixed to the machine spindle. A rotatable shaft having a tool-mounting portion is coupled to the holder body such that the shaft is axially and radially displaceable relative to the holder body. A positioning member is fixedly disposed on the machine tool body radially outwardly of the machine spindle. A casing is disposed radially outwardly of the rotatable shaft such that the casing and the rotatable shaft are rotatable relative to each other, the casing being engageable with the positioning member to accurately position the rotatable shaft when the holder body is fixed to the machine spindle. A guide bushing is fixedly supported at one axial end portion of the casing remote from the holder body.