Abstract: A cutter includes: a cutter main body rotated; and cutting edges disposed on an outer periphery of a front of the cutter main body, wherein a mounting hole penetrating through the cutter main body is formed, an opening portion opening in a front of the cutter main body, a housing portion provided on a rear of the opening portion to house a head portion of a headed bolt, and a female thread portion are formed in the mounting hole, a mounting part including a male thread portion in an outer periphery is mounted to the female thread portion, the male thread portion screwable to the female thread portion, and a through hole having a smaller inner diameter than the head portion is formed in the mounting part.

Abstract: A cutting tool includes a base body and a cutting head at least partially disposed within a modular pocket of the base body. The modular pocket is formed by at least one wall section removably attached to the base body. In one variation, a non-removable portion of the base body also forms part of the modular pocket. In another variation, the modular pocket is formed by two removable wall sections on opposite sides of the modular pocket. In yet another variation, the removable wall sections include a clamping portion to exert a downward force on the cutting head to enable mounting the cutting head in the modular pocket using an interference fit.

Abstract: A tube deburring apparatus is disclosed and configured for deburring and beveling a terminal end of a tube. In at least one embodiment, the apparatus provides a deburring mechanism configured for use with a torque mechanism. The deburring mechanism provides a plurality of spaced apart bearings radially arranged about a center axis of rotation of a deburring body of the deburring mechanism and defining an imaginary receiving boundary sized for coaxially receiving the terminal end of the tube therewithin. The deburring body further provides a deburring bit positioned radially inwardly from the bearings, a deburring end of the deburring bit providing a cutting edge configured for selectively contacting the terminal end of the tube when the terminal end of the tube is coaxially positioned within the receiving boundary between the bearings.

Abstract: The present invention concerns an ultrasonic welding installation comprising an ultrasonic vibration unit having a sonotrode and a converter, wherein the sonotrode and the converter are arranged in mutually adjacent relationship along a longitudinal axis and the ultrasonic vibration unit can be caused to resonate with an ultrasonic vibration in the direction of the longitudinal axis with a wavelength ?/2, wherein there is provided a holder for holding the ultrasonic vibration unit.

Abstract: In a T-shaped tool (10) in which a head (30) having cutting edges (36, 38) and a cylindrical shank (20) are fastened together: the shank comprises a super-hard alloy, and an engaging portion which engages with a tool main body is formed in a distal end portion thereof; the tool main body comprises a steel material, and an engaged portion which engages with the engaging portion of the shank is formed therein; and the engaging portion and the engaged portion are fastened in such a way as to be retained and prevented from rotating.

Abstract: A filing and fastener driving bit assembly for deburring the end of a pipe includes a shaft that has a first end and a second end. A first section of the shaft that is positioned adjacent to the first end is hexagonally shaped. The first section is insertable into a chuck of a rotary tool to couple the shaft to the rotary tool. A second section of the shaft that is positioned between the first section and a second end of the shaft is textured. The second section is used to file an edge of a tubular substrate, such as Electrical Metallic Tubing, as the shaft is rotated by the rotary tool. A screwdriver tip that is coupled to the second end of the shaft is insertable into a complementary head of a fastener, positioning a user to utilize the rotary tool to drive the fastener.

Abstract: A cutting tool comprises a shank having an insertion portion protruding from a shank main body, a head in which an insertion hole into which the insertion portion is inserted is formed, and a spacer disposed in a gap between the shank main body and the head. The insertion portion has a tapered outer circumferential surface which gradually decreases in diameter from the other side toward one side in the axial direction. The insertion hole has a tapered inner circumferential surface coming into surface contact with the tapered outer circumferential surface. A head end surface of the head which faces the other side in the axial direction comes into surface contact with a surface facing one side in the axial direction of the spacer.

Abstract: A drill tip may include a first part and a second part. The first part includes a cutting edge located at a side of a first end, and a recess located at a side of a second end, where the first end is one side of a central axis and the second end is another side of the central axis. The second part includes a shank portion extending along the central axis, and an engaging portion which connects to the shank portion at a side of the first end and includes a diameter greater than the shank portion. The engaging portion is located in the recess.

Abstract: The embodiments described herein relate to methods, systems, and structures for cutting a part to form a highly reflective and smooth surface. In some embodiments, the part includes substantially horizontal and vertical surfaces with edges and corners. In described embodiments, a diamond cutter can be used to cut a surface of the part during a milling operation where the diamond cutter contacts the part a number of times with each rotation of the spindle of a milling machine. In some embodiments, a complex feature having planar and curved surfaces is cut into a part.

Abstract: A side milling cutter arbor for mounting a selected milling cutter on a vertical milling machine that includes first, second and third interconnected members. The first member has a generally cylindrical body portion and a reduced diameter shank portion connected to the body portion. The body portion is provided with a longitudinal bore having a first portion having a key way and a second portion, the second portion being generally rectangular in cross-section. The second member has a flange portion, an intermediate portion having a key receivable within the key way and an end portion, the end portion being generally rectangular in cross-section and being closely receivable within the second portion of the longitudinal bore of the first member. The third member functions to removably interconnect the first and second members.

Abstract: A rotary cutting tool includes a replaceable cutting tip having a cutting portion structured to perform cutting operations on a workpiece and a first threaded portion disposed generally opposite the cutting portion. The cutting tool further includes a generally cylindrical tool body disposed about a central longitudinal axis. The tool body has a first end portion adapted to be coupled to a machine tool and an opposite second end portion having a second threaded portion cooperatively engaged to the first threaded portion. The second threaded portion is moveable with respect to the tool body in a manner that selectively couples the cutting tip to the tool body.

Abstract: An adjustable drill is provided comprising a drill body having at least one face surface with a plurality of serrations provided therewith. The drill further has at least one cartridge having a cooperating plurality of second serrations, to be driven with the drill body when assembled therewith. The at least one cartridge includes at least one insert pocket, and at least one insert is releasably affixed in the insert pocket provided in the cartridge. In further examples, the adjustable drill may have a central cutting system in combination with the adjustable cartridge type system, wherein the central cutting system may be modular. There may also be provided a modular type of holder arrangement to provide flexibility to adapt the system for various applications.

Abstract: The invention relates to a modular drill including a shank part with an end side. A cutting part can be connected to the shank part at its end side. The shank part has at least one torque transmission element which projects on the end side and has at least one torque transmission face for transmitting a torque in the rotational direction from the shank part to the cutting part. The cutting part has at least one torque receiving region for receiving the torque. The at least one torque receiving region has at least one torque receiving face which corresponds with the torque transmission face. The cutting part has at least one centering element for radially centering the cutting part in relation to the shank part. The cutting part is clamped to the shank part via a clamping element which acts at least predominantly in the axial direction.

Abstract: A rotary-driven tool for cutting machining, in particular a drilling tool with a cutting body and a holder with a shaft piece is disclosed, with at least a cutter and a dovetail-shaped region on the cutting body and a matching dovetail recess on the holder. The cutting body can only be inserted in the holder laterally to a longitudinal axis of the holder. In order to fix the cutting body, opposing flank sections of the dovetail recess, between which the dovetail-shaped region fits can be moved over each other by means of a screw connection in the holder and on fixing the cutting body said body is subjected to a force on the axial direction by the screw connection. In one aspect, the cutting body is a cutting head and the axial force is exclusively generated by the dovetail-shaped region in cooperation with the dovetail recess in the holder.

Abstract: In a drilling tool including: a shank located at a tip side of a tool main body; and a bit located at a tip side of the shank, the shank and the bit (connection body) are connected to each other via screws, and a guide part for center alignment for aligning the centers of the shank and the bit is formed in the vicinity of screw portions of the shank and the bit.

Abstract: A milling tool assembly has a replaceable cutter and a reusable shank connected to the cutter with a detachable joint. The joint may be, for example, a threaded connection. An intermediate alignment sleeve made of an elastic or semi-elastic material, is positioned between the cutter and the shank about the axis of rotation of the shank.

Abstract: A cutting tool has a cutting insert secured in a tool shank by means of a clamping bolt, whereby two opposing side surfaces of a body portion of the cutting insert are located between two spaced apart protuberances of the tool shank. The body portion includes a cut-out extending between the two opposing side surfaces and opening out to a bottom surface. The cut-out includes an undercut with at least one undercut sub-surface with respect to a forward direction. The clamping bolt can be rotated from a locked position wherein the bolt shank has a threaded portion engaged in one of the protuberances and a bolt locking portion located directly forward of the at least one undercut sub-surface, to an un-locked position wherein the threaded portion remains engaged in the protuberance and no portion of the bolt shank is located directly forward of the at least one undercut sub-surface.

Abstract: A bevel head replaceable rotary tool is provided. The rotary tool includes a coupling protrusion and a coupling recess, plural sets of serrations provided on an outer circumferential surface of the coupling protrusion and an inner wall surface of the coupling recess, circumferential abutting portions provided on the tool body and the bevel head, and axial tight-contact portions, provided on the tool body and the bevel head. The serrations of the coupling protrusion and the serrations of the coupling recess arranged such that curvatures of circumferential circular arcs of the serrations of the coupling protrusion are greater than those of the serrations of the coupling recess or the serrations of the coupling protrusion and the serrations of the coupling recess have circumferential circular arcs with centers deviated from each other.

Abstract: Reaming tool includes a head and one or more detachable cutting inserts fixed in seats. The seat includes radial, tangential and axial support surfaces, while the cutting insert has a mirror-symmetrical polyhedron shape comprising six limiting surfaces, viz. two chip surfaces and four clearance surfaces, a number of alternately usable identical cutting edges formed in the transitions between the chip and clearance surfaces. The cutting insert has a rhombic cross-sectional shape with four clearance surfaces, which meet each other in pairs at obtuse angles in two opposite corners, and which, along each individual chip surface, form two cutting edges alternately usable by indexing the cutting insert. The seat additionally includes a slope surface forming an obtuse angle with the radial support surface, suitably of the same magnitude as the obtuse angle between the clearance surfaces of the cutting insert. Tool head and reaming insert for the tool are disclosed.

Abstract: A drilling tool of the loose top type includes a basic body having two bendable branches having inner support surfaces that are resiliently pressable against side contact surfaces of a replaceable loose top. The mounting of the loose top is affected by turning-in from an initial position to an operative end position. An abutting edge along each side contact surface then bends out the branches and subjects the branches to a spring force that reaches a maximum in a dead position so as to then decrease somewhat up to the operative end position. During the final phase of the rotary motion, the operator obtains, in a tactile and/or auditory way, confirmation of the loose top indeed reaching its operative end position.

Abstract: A step drill bit comprises a body. A cutting edge insert is removably attached to the body. The body may be made of a first material and the cutting edge insert may be made of a second material where the second material is different than the first material. The cutting edge insert may define a plurality of progressively larger cutting diameters.

Abstract: A rotary cutting tool includes a cutting tip having a cutting portion adapted to perform cutting operations on a workpiece and a threaded aperture defined therein generally opposite the cutting portion. The cutting tool further includes a generally cylindrical tool body disposed about a central longitudinal axis, the tool body having a first end portion adapted to be coupled to a machine tool and an opposite second end portion including an aperture having a coupling mechanism disposed therein. The coupling mechanism includes a first threaded portion cooperatively engaged to the threaded aperture of the cutting tip. The first threaded portion is moveable with respect to the tool body in a manner that selectively couples the cutting tip to the tool body.

Abstract: A fluted drill has a drill body with a fluted drill cutting head removably secured thereto. The cutting head has two drilling portions facing axially opposite directions. In axial view, the cutting head has at least four through openings. Each drilling portion includes a plurality of head flute portions and a plurality of cutting head coupling portions.

Abstract: A throw-away rotating tool improves workability of detaching a throw-away tip and prevents from damaging a body. In the throw-away tool, a convex connection for the throw-away tip has protrusions, each of the protrusion includes a sliding contact portion detachably fitted into the inner peripheral groove recessed in the inner peripheral wall of a body. The protrusion has a first tilt portion continuous to the sliding contact portion. In detaching the throw-away tip from the body, the first tilt portion rotates ahead of the sliding contact portion, and a standing portion is elastically deformed due to a wedge effect of the first tilt portion. As a result, the protrusion can be gently removed from the inner peripheral groove.

Abstract: A rotatable tool for chip removing machining, including a basic body having front and rear ends between which a first center axis (C1) extends around which the basic body is rotatable, and a loose top having front and rear ends between which a second center axis (C2) extends. The front end of the basic body includes a jaw which is delimited by two torque-transferring drivers and an intermediate bottom in which a part of the loose top is receivable, and a center hole that mouths in the bottom of the jaw and has a hole wall which extends axially inside the basic body and in which a threaded hole mouths for a screw to co-operate with a centering pin that protrudes axially rearward from the loose top, the centering pin being insertable into the center hole. The centering pin has a cross-sectional area that is less than a cross-sectional area of the center hole.

Abstract: A twist drill includes a drill body having a chip flute extending a distance along the drill body. The chip flute has a leading edge and a run-out edge running along the chip flute. The run-out edge is disposed behind the leading edge in a direction of rotation of the twist drill. The chip flute, viewed cross-sectionally in a direction perpendicular to the longitudinal axis, includes a first wall portion and a second wall portion. The first wall portion extends along a curve between the run-out edge and the second wall portion. The second wall portion extends in a straight line from between the leading edge and the first wall portion. The first wall portion and the second wall portion are disposed adjoining one another and together define a J-shaped cross-sectional profile perpendicular to the longitudinal axis.

Abstract: A rotary cutting tool for reaming operations, including a generally cylindrically shaped tool shank with a longitudinal axis having a plurality of radially protruding and generally axially extending clamping wings, and a cylindrically shaped cutting head having a central bore and a plurality of axially extending cutting edges with an outer cutting diameter. The central bore has a plurality of circumferentially and alternately spaced bore sectors and bore recesses, where each bore sector has an outwardly inclined female clamping surface in clamping contact with an outwardly inclined male clamping surface of each clamping wing. A cylindrical shaped locking sleeve and a cylindrical shaped clamping nut assembled to the tool shank provide a means to adjust the clamping contact forces and the cutting diameter of the cutting head, and also enable removal and replacement of the cutting head without removal of the locking sleeve and clamping nut.

Abstract: In a tool coupling in the form of a cutting tool used for internal machining operations, a second component having a single cutting portion is clamped to a first component by means of a clamping screw. The second component has a mounted surface with three male engaging members interfacing with three female engagement members on a mounting surface of the first component. Each of the three female engagement members has two sets of side surfaces located on a shared portion, the shared portion exhibiting mirror symmetry about a first plane, and each set of side surfaces having two opposing flank surfaces separated by the first plane. Only one of the two flank surfaces of each of the two sets of side surfaces is in clamping contact with a corresponding abutment surface on each of the three male engaging members.

Abstract: An adjustable drill has a drill body having a face surface with a directional feature provided therewith. At least one cartridge is mounted adjacent the face surface and selectively slidable along the directional feature to provide adjustment. At least one insert is releasably affixed in an insert pocket provided in the cartridge. In further examples, the adjustable drill may have a central cutting system in combination with the adjustable cartridge type system, wherein the central cutting system may be modular. There may also be provided a modular type of holder arrangement to provide flexibility to adapt the system for various applications.

Abstract: An adjustable drill has a drill body having a face surface with a directional feature provided therewith. At least one cartridge is mounted adjacent the face surface and selectively slidable along the directional feature to provide adjustment. At least one insert is releasably affixed in an insert pocket provided in the cartridge. In further examples, the adjustable drill may have a central cutting system in combination with the adjustable cartridge type system, wherein the central cutting system may be modular. There may also be provided a modular type of holder arrangement to provide flexibility to adapt the system for various applications.

Abstract: An indexable insert for solid drills has four identical cutting edges (30) arranged at a distance above a supporting base (42) and each extending between two cutting-edge corners (28?, 28?). The cutting edges are each bounded by a cutting face (46) and a clearance face (48), with the inclusion of a wedge angle (b). Of the cutting edges (30), one in each case is in an active operating position during the drilling operation. To permit optimum adaptation to the cutting conditions and drilling characteristics, varying over the length of the cutting edge of the drilling tool, it is proposed according to the invention that the height (h) of the four cutting edges (30), measured from the plane of the supporting base (42), and/or the clearance angle (a) varies over the length of the respective cutting edges (30).

Abstract: An adjustable drill having a drill body having a longitudinal axis, and a face surface including an aperture extending into the drill body. A directional feature adjacent the aperture extends toward an edge of the drill body, and a longitudinal gullet extends from the face surface along at least a portion of the drill body. A cartridge adjacent the face surface is selectively slidable along the directional feature, and a cutting face having an insert pocket positioned adjacent the edge of the drill body in which an insert is releasably affixed.

Abstract: A drill has inner and outer inserts. The drill includes a drill body having a rotational axis; an inner insert mounted adjacent to the axis at a proximal end of the drill body having an axis-symmetrical contour having four cutting edges and four rounded corners; and an outer insert identical to the inner insert being mounted farther away from the axis than the inner insert. Loci of the inner and the outer insert partially overlap. At the overlapping region, the cutting edge of the inner insert and the cutting edge of the outer insert extend toward the axis in a direction to a workpiece and the locus of the cutting edge of the inner insert protrudes in a direction to the workpiece along the axis of the drill body compared to the locus of the cutting edge of the outer insert.

Abstract: A rotatable tool for chip removing machining including a basic body and a loose top; the body includes two torque-transferring drivers and an intermediate bottom in which a rear coupling part of the loose top is receivable, and a center hole that mouths in the intermediate bottom. A centric pin is insertable into the center hole, and a screw is accessible from the outside of the basic body. The coupling part includes a pair of side contact surfaces which cooperate with a pair of side support surfaces on the drivers of the basic body for the transfer of torque and negative axial forces between the coupling part and the drivers.

Abstract: Rotatable multi-operation tool including replaceable cutting inserts of different types, and a basic body rotatable around a center axis with rear and front ends from which there is extending rearward an envelope surface in which at least one chip space is countersunk, which opens in the envelope surface and in the front end. A first cutting insert type is mounted in a first insert seat formed in one side surface of the chip space in the immediate vicinity of the front end and included in a cavity opening in the front end for the cutting insert to partly protrude axially forward from the front end. A second cutting insert type is mounted in a second insert seat formed in the same side surface as the first insert seat and situated axially behind the first insert seat and included in a cavity opening in a part of the envelope surface.

Abstract: An indexable drill includes an insert attachment seat and a chip discharging groove formed so as to extend from a leading end surface to a trailing end side of the drill in the direction of the axis of rotation and through which chips generated by the cutting insert are discharged, and in that a wall surface defining the chip discharging groove at least partly includes a smoothed surface with a surface roughness of at most 0.5 ?m in terms of arithmetic average roughness Ra, the wall surface of the chip discharging groove is partly formed on a thinned wall portion thinned by the central edge attachment seat and the outer peripheral edge attachment seat, and a crossing portion between the first wall surface and the second wall surface in the thinned wall portion is rounded.

Abstract: The invention relates to a tool (1) for machining workpieces, having a base body (3), at least one geometrically defined culling edge (15, 17) on which a face (21) abuts, a chip space (47, 53) associated with the cutting edge for receiving the chips removed by the cutting edge (15, 17), and a chip guide element (27, 29) associated with the cutting edge (15, 17). The tool is characterized in that the cutting edge (15, 17) together with the chip guide element (27, 29) forms a receiving gap (43, 45) which merges into the chip space (47, 53) and into which the chips removed by the cutting edge (15, 17) are introduced, and the chip guide element (27, 29) has a guide surface (39, 41) which, together with the face (21), forms a receiving channel (51) which abuts the receiving gap (43, 45).

Abstract: A drill includes a tool body having a fluted portion having a second end and a tool head portion, having a cutting tip and at least one cutting edge, removably connected to the second end of the fluted portion. The fluted portion includes a receiving pocket disposed in the second end and is defined by a peripheral side wall extending about the periphery of the receiving pocket. The tool head portion includes a driving projection configured to be inserted into the receiving pocket. The driving projection and receiving pocket have corresponding elongated, curvilinear, dog-bone shapes. The driving projection includes a first end portion, a second end portion, and a central portion disposed between connecting the first end portion and the second end portion. The first end portion and the second end portion each have a width that is substantially greater than a width of the central portion.

Abstract: A cutting tool insert and holder therefore, the drill insert having a helical geometry corresponding to helical flutes in a drill body holder which enable the drill tool assembly to more efficiently remove chips from a hole during operation, the drill insert comprising a drill insert body having a first end opposite a second end, a plurality of helical flutes formed in the drill insert body, a plurality of cutting edges formed at the interfaces of the plurality of helical flutes and the first end of the drill insert body, and an aperture formed in each helical flute.

Abstract: A cutting tool including a body, a blade, a feed shaft, and a locking member. The body defines an axis and is adapted to be received by a spindle of a power tool. The blade is removably supportable on the body and rotatable about the axis for cutting a workpiece. A feed shaft is removably supportable in the body and rotatable about the axis for engaging a workpiece, the feed shaft being mountable in the cutting tool to engage and at least partially restrain the blade. The feed shaft further includes an opening transverse to the axis. The locking member is engageable with the body and with the opening in the feed shaft. Advancement of the locking member into the opening tightens both the blade and the feed shaft to the body.

Abstract: A rotatable multi-operation tool for chip removing machining, including a plurality of replaceable cutting inserts of different types, and a basic body that is rotatable around a center axis and includes a rear end and a front end from which there is extending rearward an envelope surface in which at least one chip space, delimited by two opposite side surfaces, is countersunk, which opens in the envelope surface and in the front end. A first cutting insert is mounted in a first insert seat that is formed in one side surface of the chip space and situated in the immediate vicinity of the front end and included in a cavity that opens in the front end for the cutting insert to partly protrude axially forward from the front end. A second cutting insert, of a type other than the first cutting insert, is mounted in a second insert seat, which is formed in the same side surface as the first insert seat and situated axially behind the first insert seat.

Abstract: In one advantageous embodiment, an apparatus may comprise a boring bar, a slot, a channel, a centering pin, and an adjustment system. The slot may extend substantially perpendicular to an axis extending through the boring bar. The slot may be configured to receive a cutting unit. The channel may be located within the boring bar extending substantially along the axis. The centering pin may be moveably located within the channel and configured to selectively engage a centering feature in the cutting unit. The adjustment system may be configured to position the centering pin relative to the channel in a plurality of axes.

Abstract: A cutting tool including a body, a blade, a feed shaft, and a locking member. The body defines an axis and is adapted to be received by a spindle of a power tool. The blade is removably supportable on the body and rotatable about the axis for cutting a workpiece. A feed shaft is removably supportable in the body and rotatable about the axis for engaging a workpiece, the feed shaft being mountable in the cutting tool to engage and at least partially restrain the blade. The feed shaft further includes an opening transverse to the axis. The locking member is engageable with the body and with the opening in the feed shaft. Advancement of the locking member into the opening tightens both the blade and the feed shaft to the body.

Abstract: A twist drill having at least two cutting inserts at the tip each with its own J-shaped chip guiding flute and a method for the production thereof.

Abstract: Reaming tool includes a head and one or more detachable cutting inserts fixed in seats. The seat includes radial, tangential and axial support surfaces, while the cutting insert has a mirror-symmetrical polyhedron shape comprising six limiting surfaces, viz. two chip surfaces and four clearance surfaces, a number of alternately usable identical cutting edges formed in the transitions between the chip and clearance surfaces. The cutting insert has a rhombic cross-sectional shape with four clearance surfaces, which meet each other in pairs at obtuse angles in two opposite corners, and which, along each individual chip surface, form two cutting edges alternately usable by indexing the cutting insert. The seat additionally includes a slope surface forming an obtuse angle with the radial support surface, suitably of the same magnitude as the obtuse angle between the clearance surfaces of the cutting insert. Tool head and reaming insert for the tool are disclosed.

Abstract: A tool system having at least two tool parts with opposed end contact surfaces which bear against one another in the region of an interface. The contact surfaces have a tooth system thereon including intermeshing teeth and recesses. The tooth system is shaped and positioned such that the contact surfaces can be fitted together only in at least one defined rotary angle position with respect to the center axis of the tool parts.

Abstract: A cutting tool, and a loose top therefore, includes two parts detachably connected to each other via a threaded joint in which co-operating male and female threads are included in the form of helicoidal ridges. The profile shape of each helicoidal ridge is defined by a top and two flanks, which delimit a helicoidal groove having a bottom. The first flank is inclined in relation to a center axis of the tool at a first angle that is smaller than a second angle of the second flank in relation to the center axis. Accordingly, the thread ridge is reinforced in comparison with thread ridges having a symmetrical profile shape, whereby larger tensile forces than compressive forces can be applied to the threaded joint while avoiding damage to the thread ridges.

Abstract: A drill holding tool includes a shaft and a drill-holding portion which has a recess defined axially in an outer periphery thereof so as to receive a flat center drill therein which has one end protrudes out from the distal end of the drill-holding portion. The recess is defined by two sidewalls and a bottom surface, and a threaded hole is defined through the bottom surface. Two semi-circular reception holes are defined in two insides of the two sidewalls and two positioning pieces are received in the reception holes. The center drill includes a positioning hole corresponding to the threaded hole in the recess and two semi-circular positioning notches in which the two positioning pieces are partially received. The center drill is a flat piece which saves material required and the positioning notches allow the center drill to be quickly and precisely positioned.

Abstract: An indexable drill is offered which enables suitable integration of a drill body and cutting insert. The crosshatch angles of clamp receiving faces of a cutting insert which are respectively pressed by clamp faces and of torque receiving faces which cross the clamp receiving faces and are adjacent thereto and to which is transmitted the rotary force of the drill body from the torque transmission faces are formed smaller within a range of 2° or less which is less than the crosshatch angles of clamp faces which clamp and hold the cutting insert of the drill body and torque transmission faces which cross these clamp faces and are adjacent thereto and which transmit the rotary force of the drill body to the cutting insert.

Abstract: The invention relates to a machine tool, particularly a machine reamer, comprising a shaft-type base and a replaceable cutter head which frontally protrudes from the base. An axially protruding extension of said cutter head engages into a frontal receptacle that is fixed to the base, the cutter head being removably clamped in said receptacle by means of a clamping screw which penetrates the replaceable cutter head in a truly axial direction. The screw head of the clamping screw rests against a face of the replaceable cutter head. The extension of the replaceable cutter head is provided with a polygonal part which is complementary to a truly axial polygonal hole that is fixed to the base and is penetrated by the polygonal part.