Abstract: To provide a method for forming an anchor hole and a diameter expansion device by which a centrifugal force can be appropriately adjusted when a cutting-blade portion is moved in a radial direction by the centrifugal force to grind a diameter expansion portion. In a method for forming an anchor hole for a post-installed anchor in which a diameter expansion drill bit is inserted and rotated in a prepared-hole portion bored in a concrete fixing body and a cutting-blade portion of the diameter expansion drill bit is moved in a radial direction by a centrifugal force to grind a part of the prepared-hole portion to form a diameter expansion portion, the minimum value of the centrifugal force applied to grind the diameter expansion portion is 0.75 N and preferably 1.1 N.

Abstract: An instrument for cutting bone includes a hollow shaft having a sidewall. A cutting element is at least partially housed in the hollow shaft. The cutting element can include one or more cutting blades that are radially expandable through the sidewall. The instrument can also include a piercing tip on a distal end of the hollow shaft is located distally of the one or more cutting blades. In addition, the instrument can include an expansion element for radially expanding the one or more cutting blades through the sidewall.

Abstract: A material removal having a plurality of cartridges mounted on an active portion where a plurality of seating members mounted in each of the plurality of cartridges pivots about an axis between a retracted position and an extended position is disclosed. Alternative embodiments have a single pivotable seating member. The pivotable extending seating members operate to extend and retract in a scissors-like motion and enable compact and efficient machining operation, particularly for crank shaft bearing supports.

Abstract: A material removal tool with a cutting insert mounted in the seating pocket is disclosed. The translating bar is operably connected to the at least one radially pivotable arm by a mechanical linkage and translates under fluid pressure applied to one side of a piston head by an actuating fluid, where the actuating fluid is also coolant for the material removal tool. With the translating bar in a first position, the radially outermost edge of the cutting insert is radially inward from the first active volume, and with the translating bar in a second position, the radially outermost portion of the cutting insert is radially outward from the first active volume and the axially rearmost portion of the cutting insert is rearward of an axially rearmost portion of the arm. A method of removing material from a workpiece with the material removal tool, such as by backboring, is also disclosed.

Abstract: The machine tool lubrication device comprises connection means grippable automatically by a manipulator of the machine tool, lubricant dispensing means, and dispensing control means operable by the machine tool.

Abstract: Shaft tool with an adjustable cutting diameter, which permits improved handling. A rotating shaft tool, in particular a multi-stage reamer, with a first shaft part, equipped with a first cutting head comprising e.g. several cutting blades and a recess in the first shaft part, in which a second shaft part is positioned in the axis of the first shaft part, the second shaft part having a second cutting head with e.g. several blades and the diameter of the first cutting head being adjustable. The second shaft can be rotated in the first shaft part and the rotation in relation to one another creates a fixed connection between the shaft parts. This permits the connection between the two shaft parts and thus in particular the diameter of the first cutting head to be modified even though the shaft tool is inserted into e.g. a spindle of a machine tool.

Abstract: A longer life, low cost tool and tool holder enabling change of posture with respect to a spindle, having a high machining accuracy of a workpiece, and resistant to generation of vibration or heat, provided with a working tool for processing a workpiece, a motor having an output shaft to which the working tool is connected and rotating the working tool, a first holder for holding the working tool and the motor, a mount attached to the spindle, a generator to which rotational force is transmitted from the spindle through the mount and generating electric power for driving the motor, a second holder for holding the mount rotatably, holding the generator, and engaged with a nonrotating portion of the machine tool, and a posture adjustment mechanism which connects the first holder and the second holder and is able to change the posture of the working tool with respect to the spindle.

Abstract: A drill for forming undercuts in cylindrical bores formed in stone or concrete and including a drilling member (2;22) having a stem (3;23) provided, at its opposite longitudinal ends, respectively, with a shank (4;24) receivable in a chuck of a hand-held drilling tool and a cutting head (5;25) with abrasive cutting bodies, and a sleeve (7;27) for receiving the drilling member (2;22) and having, at its end adjacent to the shank (4;24), a radial collar (8;28), a drag bearing (11) arranged in side the sleeve for supporting the drilling member (2;22), and at least one opening (15;35, 36, 37) formed in a front, in a direction toward the cutting head (5;25), section of the sleeve and spaced axially from the drag bearing (11) by a distance (a) amounting to from about 0.05×D to about 0.6×D, where D is an outer diameter of the sleeve in the drag bearing region of the sleeve.

Abstract: A tool assembly affording a wider range of adjustment of machining diameter, comprises a boring bar and a tool cartridge supporting a cutting tip and attached to the boring bar. The tool cartridge chassis is pivotably attached via a pin within a recess formed in boring bar; an adjustment screw is provided to a first side of the pivot axis, the screw being threaded into the cartridge chassis and situated in abutment with a surface of the bar. A compression spring is provided to a second side of the pivot axis, interposed between the boring bar and the cartridge chassis. Appreciable pivotal motion can be imparted to the cartridge chassis by loosening or tightening the adjustment screw. Adjustments can be made automatically by providing a draw-bar.

Abstract: A tool having a base body is proposed, on which at least one cutter holder, preferably a rocker-type cutter holder, is mounted such that it can be adjusted transversely with respect to the axis of the tool. The cutter holder carries a cutter and rests via a pressure piece on a control chamfer, which is provided on a control sleeve which is mounted in the base body such that it can be displaced axially in relation to the pressure force. The tool is defined in that the movement of the cutter holder (35) is controlled by at least one centrifugal force-actuated element (44, 66).

Abstract: A tool assembly affording a wider range of adjustment of machining diameter, comprises a boring bar and a tool cartridge supporting a cutting tip and attached to the boring bar. The tool cartridge chassis is pivotably attached via a pin within a recess formed in boring bar; an adjustment screw is provided to a first side of the pivot axis, the screw being threaded into the cartridge chassis and situated in abutment with a surface of the bar. A compression spring is provided to a second side of the pivot axis, interposed between the boring bar and the cartridge chassis. Appreciable pivotal motion can be imparted to the cartridge chassis by loosening or tightening the adjustment screw. Adjustments can be made automatically by providing a draw-bar.

Abstract: A tool holder, which has a tool bit pivotal in a recess in one end thereof, extends coaxially through a generally bell shaped piston housing, and through the center of a piston slidably mounted on the holder for limited reciprocation in the housing axially thereof. The piston is urged by a compressing spring to a retracted position against one end of the housing, and has a reduced diameter annular wall that projects coaxially toward the end of the holder containing the tool bit. A tool actuating rod, which is pivotal in an axial bore in the holder, has on one end a lever which extends slidably into an axially extending helical slot formed in the annular piston wall, and is connected at its opposite end to the tool bit. When the piston is in its retracted position, the helical slot in its annular wall causes the actuating rod to swing the tool bit to an inoperative position within the holder recess.

Abstract: In a surgical instrument for forming a flared region of a hole, a tool radially extends in response to the instrument engaging a surface of a hole in a substrate. The instrument can include a passage sized to receive a guide wire.

Abstract: A spotfacing and counterboring tool has therethrough an axial bore communicating at one end with a recess containing a pivotal cutter blade connected to an actuator which is reciprocable on the tool between a first limited position in which it moves the cutter blade to an inoperative position within the recess, and to a second limited position in which it moves the cutter blade to an operative position in which the blade projects out of the recess. An expansion chamber in the tool communicates at one end with the axial bore in the tool, and at its opposite end is closed by the reciprocable actuator, which normally is urged resiliently into its first position, when the tool is not being used, and in which position it places the chamber in its contracted mode.

Abstract: A deburring machine essentially comprising a cutting tool (13) which pivots on an axis (16) that is perpendicular to the axis of rotation (X) and which may be retracted inside the cover (11) by a wedge (10) so that the cover (11) may be inserted through a hole; the cutting tool (13) may then be extended and opened out to deburr the edge of the hole situated on the hidden face of the part. The cutting tool pivots freely in order to adopt the correct angle for the edge to be deburred.

Abstract: A cylindrical tool body is chucked at one end in a drive spindle, and has in its opposite end a cutter blade pivotal into and out of a recess in the tool body between inoperative and operative positions, respectively. The pivoted end the cutter has thereon spaced teeth drivingly engaged with the teeth of a rack formed on one end of an elongate operating rod which reciprocates in an axial bore in the tool body. The opposite end of the rod is secured to one end of a radial pin, the opposite end of which projects slidably into a helical groove formed in the inner peripheral surface of an actuating ring which surrounds the tool body adjacent its chucked end. A friction ring which is rotatable on the tool body adjacent the actuating ring is frictionally engaged with the actuating ring by a friction clutch device which also surrounds the tool body adjacent the friction ring.

Abstract: An undercutting surgical instrument comprises a housing disposed along a longitudinal axis between a proximal region and a distal section which is sized to be inserted into a hole in a bone. A passage with an open end at the distal section is disposed through the housing along an axis to receive a guide wire for positioning the distal section adjacent to the bone. A plurality of axially extending slots in walls of the housing are arranged around the passage and extend between the proximal region and the distal section of the housing, and receive a plurality of axially extending arms. A proximal region of each arm is pivotally mounted to the housing, and a distal end of each arm carries a cutting tool so that the cutting tools are arranged around the open end of the passage (and the guide wire).

Abstract: It is the object of the present invention to drill a hole and, at the same time, transmitting an application force exactly to an undercutter for forming an undercut space in the cylindrical wall of the hole at a position near the hole bottom. An apparatus according to the present invention includes a rear circular member 1, a sleeve 10 supported in telescopic engagement with the rear member 1, an undercutter 5, and a front annular member 15 linking and movable with the undercutter 5. The sleeve 10 has an inner flange 13 forward from the rear member 1. An application force transmission mechanism 18 comprises a cam 20 supported by the rear member 1. The cam 20 has a pair of steps 21 and 22. The transmission mechanism 18 also comprises a first impact transmission rod 23 extending between the cam step 21 and sleeve flange 13, and a second impact transmission rod 24 extending between the step 22 and front member 15.

Abstract: An expansible drill is provided for drilling and undercutting holes. The drill comprises a rotatable tubular drill body having a drill head at one end for cutting a bore. At least one undercutting arm is located within a slot in the drill body and attached by a hinge such that at least a part of the arm is pivotal radially outwards. A guide is provided for moving the arm radially outwards, the guide comprising a shaft which is located within the drill body and constrained to rotate therewith. A locking mechanism selectively prevents or allows the shaft to move axially relative to the drill body as force is applied to an end of the shaft.

Abstract: A deburring tool which has a holder from which an elongated sleeve extends. A blade is arranged in the sleeve close to the free end thereof which can be moved inside or outside the sleeve with a movable pin. The blade extends outside the sleeve through a close fitting opening made in the wall of the sleeve in such a way that its cutting side abuts a limiting edge of the opening in the sleeve thereby closing the opening.

Abstract: The drilling apparatus for making a drilled hole with an undercut includes a drive device for rotating a hollow drilling shaft (3); a drill bit holder (23,38) held in the hollow drilling shaft (3); a drill bit (4,26) having a drilling head provided with laterally projecting cutting edges (25) projecting from the drill bit holder (23,38); a device for swivelling out the drill bit holder (23, 38) with the drill bit from a drilling center line (5) including at least one control element of the drill bit holder, a sliding sleeve (11) surrounding the drilling shaft (3) and a swivelling-out element (21,39) connected to the movable sliding sleeve and engaging the control element to swivel out the drill bit holder (23, 38); and a device for raising and lowering the drive device (2) together with the drill bit holder (23,38) and the drill bit (4,26). In one embodiment the swivelling-out element is a sliding block and the control element is a cam surface in a slot provided in the drill bit holder.

Abstract: A contour head apparatus for effecting a radial adjustment of a cutting edge tool is disclosed. The contouring head apparatus is adapted for use with a numerically controlled spindle and sleeve, the sleeve capable of rotation about a first axis and the spindle capable of longitudinal movement along the first axis. A housing is rotatable about the first axis when driven by the sleeve and is held longitudinally stationary with respect to the first axis. The housing has a longitudinal aperture therethrough coaxial with the first axis allowing access to an outer end of the spindle. A yoke is disposed within the housing and pivotally connected to the housing for pivotal movement between first and second end limits of travel. The yoke is connected to the spindle at a first end and has a second end driven in rotation about the pivotal connection in response to longitudinal movement of the spindle.

Abstract: Drilling apparatus (50) for producing drilled holes with undercuts, with a drill (15), the drill shank (19) of which has a side cutting edge (14) protruding radially beyond the periphery (18) of the drill shank, and, on its circumference, opposite the side cutting edge (14), has a flattening, which makes possible the insertion of the side cutting edge (14) into the drilled hole, and the drill shank (19) of which is firmly connected with a connecting coupling (20), which is disposed in an articulated fashion between the drill (15) and a drill driving mechanism, permits wobbling motions of the shank as the drill (15) is rotating and has a drill shank-side coupling (29) with an axially movable indentor (85), which can be supported on an inclined plane (17) of a coupling (29) connected with the drill shank (19), which inclined plane (17) brings about the radial advance of the side cutting edge (14).

Abstract: Alternative tool wear compensation modules employing drawbar actuated tool position adjustment or electrically activated solid-state prime mover adjustment including means for physically sensing and verifying the extent of adjustment without awaiting the gaging of successive work piece dimensions following compensation adjustment. In one embodiment, a piezoelectric stack is employed with a flexure unit mounted tool to produce adjustment deflection through controlled voltage applied to the piezoelectric stack.

Abstract: Rotating drill head with a boring bar which is swivel able by small amounts transversely to the rotational axis by fluidic means, with a base, a driven member located opposite the base, a pressure chamber arranged between the base and driven member and having a fluid inlet, and with an expanding lever gearing in a working connection with the driven member and serving for the synchronous and oppositely directed swiveling of a tool carrier and a compensating member which are constructed so as to be geometrically similar and constitute the boring bar.

Abstract: A machine tool is disclosed having an inverted spotfacer chucked in a rotatable tapered spindle socket. The inverted spotfacer comprises an actuation shaft being rigidly axially connected to a tapered shank which, in turn, is chucked in the socket. A shoulder element can be displaced on the actuation shaft against the force of a spring. Further, a positive control mechanism acts between the actuation shaft and the shoulder element. Due to the action of the positive control mechanism, when axially displacing the actuation shaft relative to the shoulder element, a cutting tool arranged tiltably at the lower end of the actuation shaft may be tilted between two operational positions. In the first operational position the cutting tool extends parallel to the longitudinal axis of the spotfacer, whereas in the second operational position the cutting tool extends perpendicularly to the spotfacer axis, the second operational position being the position in which the spotfacer may make countersunk bores on workpieces.

Abstract: A tool is described for boring spherically curved inner surfaces consisting of a main body which rotates about its longitudinal axis during the boring operation. A swivel housing is mounted on an axle bolt in the main body and can thus be swiveled about an axis at right angles to the longitudinal axis. The swivel motion is produced with the aid of a linkage arrangement provided in the tool. A cutting tool holder is guided for longitudinal displacement in the swivel housing at right angles to the axle bolt. The cutting tool holder is supported lateral wedge surfaces on a mating wedge surface of the axle bolt and extends with a shank part through the axle bolt. With the aid of a compression spring and an adjusting screw, the axle bolt can be displaced in the longitudinal direction relative to the cutting tool holder to adjust the radial spacing of the cutter from the axle bolt by the mating wedge surface.

Abstract: A tool mechanism for machining a hole side surface, and for chamfering the ends of the hole, includes a boring cutter and two chamfer cutters oriented so that during an axial infeed of the cutter assembly the hole side surface is machined and a chamfer is formed at one end of the hole. The cutter assembly can be shifted transversely to position a chamfer cutter for machining a second chamfer on the other end of the hole. The cutter assembly is carried on a cutter support member that is swingably mounted on a tool body secured to the spindle of the cutting machine. An actuator device is movable along the tool body axis to adjust the position of the cutter support member.

Abstract: Safe and structurally simple design for a finebore machine with a turning tool (3) mounted on a boring bar (2), whereby the excursion of the turning tool is produced by a piezoelectric servomotor without any magnetic actuation. This is achieved in the following manner: (a) the turning tool (3) is lodged in a spring-mounted tool holder (4) which is made to deflect by a translatory driving servomotor (6); (b) the driving direction of the servomotor (6) is perpendicular to the operating direction of the turning tool (3); (c) the driving strength of the servomotor (6) acts on the one end of a connecting rod (8) which is lodged separately from the servomotor (6); (d) the other end of the connecting rod (8) abuts on the free mobile end of the tool holder (4) in a fixed position relative to the latter. The shape of the bore to be produced can be preset as an electronic image.

Abstract: The invention relates to improvements in drills for undercutting holes and in particular to expansible drills. The drill according to the invention comprises a rotatable tubular drill body having an axial bore, at least one radially extending arm attached by hinge means at one end to the drill body such that the arm is pivotal radially outwards, cutting means formed in the arm, guide means for moving the arm radially outwards, said guide means comprising a non-rotating shaft, and means for moving the shaft axially relative to the drill body towards said one end, so as to cause the arm to pivot radially outwards.

Abstract: A device for forming an undercut in a drilled hole comprises a stem having a pivotal reaming element at a lower end thereof, and a guide tube in which the stem is longitudinally displaceable with the reaming element pivoting radially outwards from the guide tube in a lower end position of the stem.

Abstract: An adjustable tool holder for cutting tools in boring machines having an internal drawbar includes a housing pivotally connected to a rotary spindle and a forwardly disposed cutting tool. A wedged camming surface is positioned forwardly on the drawbar for contact against an internal drive lever axially disposed for pivotal contact against the housing. Upon actuation of the drawbar the housing is stressed to a canted position causing pivotal adjustment of the cutting tool.

Abstract: Stitch-machining the walls of a cylindrical blind cavity of a workpiece, the cavity being deep and narrow with respect to the axis of the cavity, is carried out by: (a) supporting a tubular housing for axial movement throughout substantially the axial extent of the cavity interior and in close-fitting tolerance to the walls of the cavity, the tubular housing having a free end; (b) rotationally driving a spindle (10,000-40,000 rpm) in the tubular housing for conjoint axial movement with the tubular housing, the spindle extending beyond the housing end for carrying a radially adjustable cutting tool; (c) inserting the tubular housing together with the rotationally driven spindle into the cavity (at lineal speeds of 400-800 inches/minute) with a cutting tool radially positioned for rough boring of the cavity walls, while guiding and steering the tubular housing and spindle to accurately concentrically position the cutting tool with respect to the cavity axis; (d) substantially immediately upon the execution of r

Abstract: A rotary cutting tool useful for remotely machining tube ends, and method for using the tool to remotely machine a tube end portion such as for weld preparation. The cutting tool comprises an elongated main body having a reduced diameter front end portion and provided with three equally-spaced longitudinal grooves, each groove containing a spring-actuated cutting blade pivotally attached to the tool body. The cutting blades are adjustable radially relative to the tool body by spring and axially movable collar means, which collar is connected to and operated by an actuating piston means located at the opposite end of the tool. In use, the tool forward end with cutting blades retracted is first remotely inserted through an opening, after which the tool forward end with blades extended is inserted into a tube. The cutting tool is then rotated for trimming the end of the tube to a desired angle, and cleaning the tube end outer surface such as in preparation for welding a new mating replacement tube in place.

Abstract: A suture anchor system that includes a drill for turning into a bone mass with sissoring blades pivotally connected in a longitudinal drill shaft slot proximate to a cutting end thereof, the blade ends to sissor to extend cutting edges outwardly therefrom, which sissoring occurs at a certain depth of penetration into the bone mass, cutting a flared or skirted hole therein, to receive a suture anchor whereto a suture is secured. The suture anchor consists of a suture rivet and slotted ring and is formed by moving the suture rivet into the slotted ring, that ring breaking at spaced apart slots formed therein and flaring into a skirt, the anchor rivet and slotted ring thereby locked together as the suture anchor, which suture anchor has approximately the same shape but a slightly lessor diameter than the hole formed in the bone mass.

Abstract: The device comprises a body longitudinally provided with a stem which is suitable for being inserted into the hole of a part being machined. On the body an element is slideably coupled which has an element for attachment to the mandrel of the machine tool, which element is adapted for imparting rotation to the body itself. On the stem is slideably mounted a shaft which is articulated at its end with a tool and is coupled to the attachment element so that an axial sliding of the same element towards the part being machined actuates a sliding motion in the opposite direction of the shaft adapted for actuating the radial projection of said tool from said stem.

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 rotating head or the like having a drilling spindle and a tool carrier with an arrangement to finely adjust the tool carrier in a direction transverse to the axis of rotation of the spindle characterized by a wedge carrier which is mounted on the spindle for movement along the axis of rotation and has a bevel engaging a sliding surface of the tool carrier to shift the carrier transverse to the axis of rotation in response to movement of the wedge carrier and an arrangement for maintaining contact between the sliding surface and the bevel of the tool carrier preferably including the center of gravity of the tool carrier being offset relative to the axis of rotation on a side opposite the sliding surface so that centrifugal forces occurring during rotation of the rotating head press the sliding surface against the bevel.

Abstract: The invention relates to a cutter head having a substantially cylindrical main body and a plurality of replaceably cutting elements disposed at the periphery of said main body and having at least one cutting edge in the axial and/or radial direction of said main body. For achieving a reliable three-dimensional adjustment of the cutting members within extremely close tolerances, each cutting member is mounted on a carrier member itself mounted on said main body and adapted to be radially and axially adjusted relative to the main body by means of separate adjustment means disposed between said main body and said carrier member, and to be fixed relative to said main body with the aid of clamping means.

Abstract: Deburring apparatus for removing the burrs which are formed at the intersecting inner edges of at least two intersecting bores of a workpiece comprises; a frame having means for holding the workpiece; a cutter spindle borne rotatably in the frame; a cutter hinged to the leading end portion of the cutter spindle and biased to swing outwardly of the side thereof for cutting off the burrs at the inner edges of the bores of the workpiece held by the holding means of the frame when the cutter spindle is inserted into one of the bores and rotated; and a guide sleeve fitted slidably on the cutter spindle for sheathing the cutter, when the cutter spindle is inserted into or retracted out of the one of the bores, to protect the inner walls of the workpiece from damage, and for exposing the edge of the cutter to the outside when in the deburring operation. The cutter is directed along a curve of the inner edges of the bore of the workpiece by a cam on the frame engaged by a follower on the cutter spindle.

Abstract: A tool for cleaning or repairing the screw threads on studs, bolts and the like comprises inner and outer relatively slidable sleeve members and a series of die elements rockably mounted between the sleeve members adjacent one end or mouth of the tool so as to be urged by relative sliding movement between the members in opposite directions between the expanded position and a contracted position in which inwardly facing thread cutting teeth on the die elements are urged into a thread engaging position with a threaded member inserted into the mouth of the tool.

Abstract: A precisely adjustable cutting tool holder for a machine tool employs an eccentric shaft to directly engage and thereby to pivot a tool holding part with respect to a stationary part that is secured to the machine tool. Threaded members that engage another eccentrically oriented member may be used to minimize backlash between moving parts of the mechanism.

Abstract: A boring machine having a tapered shank received in a spindle with a pre-loaded adjustable boring bar carrying said tapered shank and a non-rotating torque arm for controlling a pre-loaded adjustable boring bar pivotally secured to a tapered shank to pivot the boring bar.

Abstract: An adjustable boring bar is disclosed having a hollow case with an integral shank and a tool supporting nose receivable in the case. An adjusting pin is mounted on the case and threadably received in the nose such that it can be pivoted between adjusted positions, and precisely moved between lateral positions in the case. A draw pin in the case passes through a lateral opening in the nose for preventing removal of the nose from the case. A collar locks the draw pin in a locking position. The position of the tool can be adjusted longitudinally, transversely, and pivotally with respect to the shank.

Abstract: A cutting tool for forming a tapered bore in a workpiece includes a pair of cutting blades pivotally supported in a slot at one end of a member and pivoted by an axially movable expander. In one embodiment, the member also has a drill bit configuration on the end of the member with the slot to initially produce the bore.

Abstract: A boring tool is disclosed capable of positioning a tool element between a radial cutting position and a radial retracted position out of contact with the finished workpiece bore to avoid tool mark formation on the finished bore during tool withdrawal. The boring tool is simple and low cost in construction and includes a resilient tool-carrying member which extends transversely of the spindle axis in cantilever fashion for deflection by a spindle draw bar relative to a stop means on a fixed support member attachable to the spindle. During boring, the tool-carrying member is in deflecting engagement with the drawbar and, in conjunction with stop means, positions the tool thereon in a radial cutting position. For tool withdrawal, deflecting engagement is released so that the resiliency of the tool-carrying member positions the tool in a radial retracted position out of contact with the finished workpiece bore.

Abstract: A boring head (10; 50) for internal machining of bores in workpieces comprising an insert holder (16; 41) and an operating means (18; 27; 51, 52) resting thereagainst. The operating means is adapted to adjust the insert holder (16; 41) radially when turned about its longitudinal axis. The boring head (10; 50) is associated with control means (21; 28; 63), which are adapted to turn the operating means (18; 27; 51, 52). To advantage the boring head might be provided with a cutting insert, the cutting edge of which comprises a straight forward portion (68) and a convex rear portion (69).

Abstract: A bore hole wall undercutting or reaming device in which a rotatable tubular support housing (1) (61) is adapted for rotation by drive means, has at least one circumferential guide slot in its side wall for receiving and guidingly supporting a cutting tool (4) (60) for movement outwardly to and inwardly from a cutting position. The cutting tool may comprise either a rigid and/or resilient slide or pivot lever (9) having a trailing end portion supporting a cutting member (10) thereon and a leading end portion connected to the housing by a single rigid, or pivotal pull type connection by which the housing tensions and pulls the cutting tool (4) around during a cutting operation.

Abstract: A retractable rotary cutting tool is disclosed in which the tool is adapted to be connected to a chuck or a tool holder of a machine tool such as an automobile tool changer on a numerically controlled machining center or the like. The cutting tool support is arranged to have a cutter which is recessed into the support and is pivotally connected to an actuating shaft coaxially within the tool support, which shaft reciprocates relative to the tool support when a thrust collar located about the tool support engages the work or another fixed external surface and will withdraw when the thrust collar engages for a second time an external surface or the work.

Abstract: A machine tool includes a tool holder supporting a cutting tool and receivable in a tool spindle. A device is provided in the tool holder to be engageable with a work table for adjusting the radial position of the cutting tool by utilizing the relative movement between the tool spindle and the work table. A contact detecting device detects the contact between the work table and the adjusting device. Relative movement between the tool spindle and the work table is caused to adjust the radial position of the cutting tool after the contact between the work table and the adjusting device is detected.