Abstract: A coupling, for joining shaft elements that rotate about a common axis to one another in a rotationally and bending-resistant manner includes fit bores, concentric to the axis of rotation, in both shaft elements, the fit bores being concentrically surrounded at one face end by engagement surfaces. A fit peg that includes connection elements, which cooperate with corresponding connection and counter elements in the two shaft elements, is inserted into the fit bores.

Abstract: In a precision adjustment head for a machine tool a slide (9) is radially adjustable in a radially extending guide (8) in a substantially cylindrical housing (1), on which slide a tool carrier (11) can be fixed. In the housing (1) the positioning member 5 is axially displaceable and a positioning element (14) is fixed to the slide (9), with a groove (15) extending obliquely to the housing axis A and tapering to its groove bottom (15a), in which engages a projecting insert (19) provided on the positioning member (5), tapering towards its free end in correspondence with the groove cross section. The insert (19) is adjustable and fixable relative to the positioning member (5) perpendicular to the groove bottom (15a).

Abstract: In a device for connecting two tool parts (1, 4) one tool part (1) is provided with a cylindrical fitting plug (2) which can be inserted in a fitting bore (5) provided in the other tool part (4). The fitting plug (2) has a transverse bore (6) with a radially displaceable tensioning pin (7) therein, which carries extensions (8) at its two ends, which engage in conical recesses (11) of two diametrically opposite tensioning elements (9, 10) arranged in the other tool part (4). The extensions (8) of the tensioning pin (7) have a hemispherical peripheral surface (8a) whose radius of curvature (R) as well as the apex angle (.alpha.

Abstract: The tool-changing device has a changing head (7). By means of this, tool holders (4) with cylindrical parts (5) of different diameters can be inserted into a tool holder receiver (1). The changing head (7) has, at the end thereof which faces towards the tool holder (4) concerned at any moment, a substantially segmental part (7a) and a first centering recess provided in the latter, which first centering recess is formed by a part-cylindrical centering surface (8) having a radius corresponding approximately to the radius (R1) of the cylindrical part (5) of a first tool holder (4).

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: 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: The machine tool spindle has a cylindrical receiving bore (3) and on its front end a plurality of concentric, annular supporting surfaces (4, 5, 6) which are separated from one another by annular grooves (7, 8) formed in the front end. The tool holders (9a) have mating projections (10) of equal diameter which fit accurately in the receiving bore (3) but shank diameters (D3) which differ stepwise from one another, the outside diameter (d1, d2, d3) of each supporting surface (4, 5, 6) being slightly smaller than the outside diameter (D3) of the annular surface (12a) of the corresponding tool holder (9a). When the annular surface (12a) (of a tool holder 9a), which is located at the transition between the shank and the mating projection (10), is in contact with the corresponding supporting surface (4, 5, 6), the or each further radially inwardly located supporting surface is located in axially spaced relationship to the opposite radial surface of the tool holder (9a).

Abstract: A tool holder with radial adjustment means. The tool holder has a connecting portion having a connecting shank, an intermediate portion and a head portion, and a tool receiving means for a tool, in particular a rotary tool. All three portions (2, 3, 4) are of substantially disc-like configuration and bear against each other with their faces (2a, 3a, 3b, 4a) which extend radially with respect to the axis (A) of the connecting shank. Provided at the periphery of the connecting portion (2) are two diametrally oppositely disposed recesses (8) into which two claws (9) arranged on the intermediate portion engage with radial play. Provided at the periphery of the intermediate portion (3) are two diametrally oppositely disposed recesses (14) which are displaced through 90.degree. relative to the claws (9) and into which two claws (15) disposed on the head portion (4) engage with radial play.

Abstract: The rotary disk for a lathe has near the circumference thereof a plurality of insert-receiving recesses (5) which are circumferentially spaced apart. For each insert-receiving recess (5) there is provided an insert disk (6) which can be removably inserted therein and within which a receiving bore is concentrically arranged. Each insert disk (6) has in the region of the cylindrical receiving bore (8) two diametrically opposite, radially extending screw-threaded bores (9, 10), a clamping screw (11) with a conical recess (12) being screwed into the screw-threaded bore (9) which is located more inwardly with respect to the axis of the rotary disk and a clamping screw (13) with a conical end part (14) being screwed into the screw-threaded bore (10) which is located more outwardly with respect to the said axis.

Abstract: In a tool change apparatus for a machine tool, a tool holder receiving means (3) is provided on the machine tool. A tool holder which is provided with a cylindrical portion for engagement of the change arm can be fitted into the tool holder receiving means (3), in the axial direction of the cylindrical portion. A radially extending screwthreaded bore (16) is provided in the cylindrical portion (4a). Provided at the free end of the change arm is a change head (17) which is movable radially with respect to the axis (S) of the cylindrical portion (4a) and which is provided at its outer end that is towards the tool holder (4) with a prism-shaped centering recess (18).

Abstract: An arrangement for supplying coolant to rotating cutting tools (1) for metal machining, in particular boring tools provided with coolant ducts (2,3), includes a coolant ring (4) arranged rotatably on the tool shank and sealed with respect thereto and having a radially projecting coupling piece (6) provided with a radial coolant bore. On a carrier piece (10) there are provided two intermediate parts (12) arranged at a distance from one another, each of which is swingable at one end (12a) with respect to the carrier piece (10) about an axis extending parallel to the boring tool axis (A), is slidable in a plane extending perpendicular to the boring tool axis (A) and can be clamped with respect to the carrier piece (10), and each of which has at its other end (12b) a bore (16) extending parallel to the boring tool axis (A) for a fixing bolt (17) which can be screwed into a stationary machine part (S).

Abstract: The turning tool has a disc-shaped base element 1 connectable to the spindle of a lathe and four toolholders 6, 7, each with one or more cutting plate supports 12, adjustable radially relative to the rotary axis (D-D), clampable with an adjusting screw 25, and carrying a cutting plate 23. The base element 1 has a housing bore parallel to the axis (D-D) of rotation to receive a cylindrical shank 5 of each toolholder 6 or 7. Each toolholder 6, 7 has an axial adjusting screw 14 screwable parallel to the rotary axis D-D. A pin 8 in the shank 5 cooperates with an axial groove 9 and is fixed by means of a screw 10 cooperating with a recess 11 in the pin 8 to clamp the shank 5 in the adjusted axial position. Different cutting plate supports 12a, 12b and 12c can be used to enable a variety of machining operations to be carried out.

Abstract: In a triangular turnround cutting plate, in particular for precision machining, a main cutting edge (3, 3a, 3b) defines an acute angle with the adjoining auxiliary cutting edge (4a, 4b, 4). A continuous radius (R) is provided between the two cutting edges (3, 3a, 3b and 4a, 4b, 4, respectively) and the length (L) of all three sides is the same. The radius (R) is in the range of 0.15 to 0.3 times the size of the length (L) of the sides of the turnround cutting plate (1) and the center (M) of this radius (R) is arranged offset from the main cutting edge (3, 3a, 3b) at a distance (a, a1) towards the center of the turnround cutting plate (1) which is in the range of 0 to 0.3 times the radius (R).

Abstract: A cutting plate carrier insertable in a holder of a machine tool, in particular a lathe tool. The carrier has a plane base surface and a substantially circular plan, the axis of which coincides with the axis of a central screw thread. The cutting plate carrier is provided with a recess for a polygonal cutting plate having a central bore. The cutting plate can be fixed in the recess by means of a clamping screw which can be screwed into the central screw thread. For the cutting plate, the recess has a plane supporting surface arranged parallel to the base surface and a number of bearing surfaces corresponding to the number of lateral surfaces of the cutting plate and extending parallel thereto. These bearing surfaces are arranged at the same distance (a) from the central screw thread. A second screw thread for screwing in a retaining screw inserted into the holder from below is provided parallel to the central screw thread.

Abstract: An apparatus for supplying a fluid to a passageway in a cutting tool includes a housing having a rotatable spindle thereon, the tool being releasably supported on the spindle for rotation therewith. A cooling medium supply ring rotatably supported on a shank portion of the tool has a first surface which faces substantially radially outwardly and slightly in the direction of rotation of the tool. A coupling head on the housing has a second surface thereon positioned for sealing engagement with the first surface when they are brought into angular alignment through rotation of the supply ring caused by frictional engagement of the supply ring and rotating tool. Fluid passes from a passageway in the coupling head through aligned openings in the first and second surfaces, into passageways in the supply ring, and then through an opening in the shank portion of the tool and into the passageway therein.

Abstract: The turning head comprises a support member (1) which is to be secured to the spindle of a machine tool. The support member (1) has a radially adjustable slider (4) which carries a tool (5). An adjusting rod (7) is displaceable coaxially with respect to the support member (1) and acts on at least one helically toothed rack (8) which is axially movable in the support member (1). Arranged on the slider (4) is a toothed bar (10) which extends in the direction of movement thereof and whose inclined teeth (10a) mesh with those of the rack (8) and are inclined at the same angle (.beta.) as the teeth of the rack (8), with respect to the axis of rotation of the support member (1).

Abstract: A tool insert for boring operations, particularly for a boring bar, comprising a housing which can be inserted in a recess in a toolholder, for example the boring bar, and which has a cutting tip support slidably mounted in a longitudinal bore therein, the said cutting tip support having a cylindrical shank, the outer end of the support bearing in a recess a replaceable cutting tip which is staggered laterally relative to the shank axis and the rear end having a thread which is engaged by the thread of an adjusting element rotatably mounted free of play in the housing between axially loaded ball bearings.

Abstract: For clamping a turnable cutter blade on a tool holder a clamping jaw is provided which has a two-arm lever construction. The clamping jaw has in its center part a substantially cylindrical projection. This projection engages a cylindrical recess of the tool holder. A locking screw extends through an opening in the center part and in the projection of the clamping jaw and is threadedly received in an internally threaded opening of the tool holder. The locking screw urges the clamping jaw into clamping engagement with the cutter blade.

Abstract: A combined boring and milling tool has at least three triangularly shaped turnable cutter blades. The effective cutting edge of the first turnable cutter blade extends as bit (or drilling cutting edge) from the periphery of the shank at least to its axis. A second turnable cutter blade is offset 180.degree. peripherally from the first and its effective cutting edge extends as cutting edge on the periphery of the shank parallel to the shank axis. A third turnable cutter blade is offset axially from the first so that its effective cutting edge extends as a cutting edge parallel to the shank axis. The two effective cutting edges of the second and third turnable cutter blades lie on the same flight circle and their working ranges overlap axially. The first and third turnable cutter blades have a common chip space.

Abstract: In a boring tool for making borings in solid metal material of workpieces, at least one cutting bit is interchangeably arranged in a recess, at the end of the borer shank. The polygonal cutting bit has a plurality of cutting edges of equal length, of which two are in engagement with the workpiece at each time. For the purposes of improved centering of the borer, these two operative cutting edges each form approximately the same angle to a line parallel to the borer axis. A plurality of cutting bits at different radial distances may also be arranged in the boring tool, with two cutting edges of each cutting bit being in engagement with the workpiece and the working regions of the cutting edges of adjacent cutting bits each overlapping somewhat.