Abstract: A method removes a fuel injector pole piece from bar stock and provides a cutoff tool having a first cutting surface and a second cutting surface separate from the first cutting surface. The pole piece and bar stock are caused to rotate about a longitudinal axis. The tool is advanced with respect to the pole piece so that the first cutting surface severs the pole piece from the bar stock and defines an unfinished end surface of the pole piece, with a certain cutting force being exerted on the tool. The tool is further advanced with respect to the pole piece so that the second cutting surface removes material from the unfinished end surface to define a finished end surface of the pole piece, with a cutting force on the tool being substantially less than the certain cutting force.

Abstract: A thread whirling device for producing a thread on a workpiece on a numerically controlled turning machine by a thread whirling method, having a retention structure for fitting the thread whirling device to the turning machine, a whirling head which is retained on the retention structure, has an opening and carries one or more cutters which are arranged peripherally on the edge of the opening, having a first drive device which is configured to drive the whirling head in a rotational manner about a first rotation axis which extends through the opening. The thread whirling device further includes a second drive device which is configured to drive the whirling head in a rotational manner about a second rotation axis which extends transversely relative to the first rotation axis, in order to orientate an angle between the first rotation axis and the spindle axis of the turning machine work spindle.

Abstract: A outer diameter shaft reducer tool includes a cutter head and main body capable of assembly together through the use of a pair of set screws. The assembly can then easily be connected to a hand-held drill through a common extension thereby allowing for the provision of automated rotation of the cutting assembly. To reduce the outside diameter of a shaft, a user inserts the bar or rod into a lumen within the main body and applies pressure to cause a number of cutting teeth to engage the end portion of the bar or rod near the outer portion of the end face. As the teeth cut, the outside diameter of the shaft is thereby reduced.

Abstract: The bar is machined, according to a required longitudinal and/or circumferential profile, by rotating tools carried by a main plate driven in rotation on the frame, the tools being connected to the plate by tool supports radially mobile on this plate, and depending on the required profile, a radial movement of the tool supports is controlled according to the axial position of the bar in relation to the chassis and/or the circumferential positions of the tools in relation to the bar. To control the radial movement, a secondary plate is driven in rotation coaxially to the main plate. The secondary plate including a device for actuating tool supports, arranged so that the positions of the tool supports depend on the relative angular position between the main plate and the secondary plate and, to permanently adjust the radial positioning of the tools during the rotation of the main plate, the relative angular position is modified.

Abstract: A machining device has a stationary member and a rotating member. A plurality of bearings on one of the members engages a surface of the other. At least one of the bearings is radially fixed, while the remainder of the bearings are radially adjustable. In another aspect of the invention, the bearings are rotatable on a first cylindrical portion of a mounting shaft that has a second cylindrical portion attachable to the machine. A radial undercut is provided around a flange between the first cylindrical portion and the second cylindrical portion.

Abstract: In order to make available a peeling device and a peeling machine, respectively, in which peeling diameters that are set can be changed even under load, the invention proposes a peeling device having a rotating peeling head and having peeling chisels disposed on the latter, which chisels are radially adjustable by way of at least one setting drive, whereby the setting drive comprises a module that rotates with the peeling head, which module controls a setting gear mechanism by means of a relative movement that is undertaken with regard to the peeling head, in the direction of rotation.

Abstract: A device for cutting bar-shaped or tubular workpieces (1, 27), for example a peeling machine, is presented, in which, for the first time, the advance of the tools (7, 26, 44, 46) is brought about by a relative rotation between a toolholder (3, 25, 45) carrying the tools (7, 26, 44, 46) and an advancing sleeve (4, 24, 47). The toolholder (3, 25, 45) and advancing sleeve (4, 24, 47) are driven via gearwheels (19, 18) arranged on the same gear shaft (17) and having an oppositely oriented helical toothing. By means of an axial movement of the gear shaft (17), a relative rotation between the toolholder (3, 25, 45) and advancing sleeve (4, 24, 47) is achieved on account of the helical toothing. Moreover, it is proposed to use milling cutters (26, 44) as tools.

Abstract: The invention is a journal turning lathe (10) for machining a tapered work piece (12). The lathe (10) includes a drive housing (18) which is an annular member housing an annular drive gear (32) journaled for rotation with respect to the annular member. A support housing (20) is disposed at the opposite end of the work piece (12). The support housing (20) comprises a second annular member and an annular driven gear (42) journaled for rotation with respect to the second annular member. A plurality of spacer rails (22) maintain the drive housing (18) in parallel, spaced-apart relation to the support housing (20). A motor (not shown) is attached to the drive housing (18) to turn the annular drive gear (32). A coupling shaft (52) extends from the drive gear (32) to the driven gear (42), and gear trains at opposed ends of the coupling shaft (52) are arranged such that rotation of the drive gear (32) is transmitted to the driven gear (42).

Abstract: The Metal Lathe, Core Drill Adaptor and Rate of Cut Device are simple lathing and drilling devices including a device that restricts the advancement of the drilling and lathing motions. These devices are attached to a most any common standard upright drilling machine in a secure method to allow a person with little or no experience to operate these devices.

Abstract: The present invention provides a CNC central cutting and turning machine includes a holding head, wherein the rear end of the holding head has a holder, which can turn, mounted thereon, and the holder has at least three claws mounted thereon for jointly holding an object to turn; and a cutter holder for cutting the object, wherein the cutter holder has circular shape and is pivoted on a rear seat for turning, a central hole of the cutter holder is capable of accommodating the object therein, and the front side of the cutter holder has a lathe tool installed thereon. Through turning the object and also the lathe tool circling around the object, the speed for cutting the object can be significantly increased and also the cutting efficiency.

Abstract: A portable journal turning lathe for machining a shaft at a job site, including a pair of clamping rings that are adapted to be centered at spaced apart locations along the length of the shaft to be machined. Extending between the clamping rings is a plurality of guide shafts which slidingly support a split ring clamshell assembly. A cutting tool carrier is affixed to the rotatable ring portion of the clamshell assembly so that when the movable ring is driven the tool carrier orbits the shaft being machined. A plurality of feed screws driven by a servomotor translates the clamshell assembly along the guide shafts.

Abstract: The invention is a new boring unit for complex parts, including a fixing pin, suitable for holding the piece in its hole, and two concentric cylinders coaxial with the pin that are set rotating in the same direction by two electric motors. The inner cylinder is provided, at its end facing the grip of the pin, with a conical toothing, and the outer cylinder is provided, at its end facing the grip of the pin, with a tool-holder with radial translation mechanisms of the tools and a bevel gear wheel meshing with the conical toothing of the inner cylinder and connected with the radial translation mechanism of the tools. The radial translation of the tools is obtained by rotating the cylinders at different speeds by means of the electric motors, that is, by generating a relative motion between them.

Abstract: A tool head for use in machine tools comprising a base body coupled to a machine spindle, comprising at least one tool-receiving means for a cutting tool, and comprising a rotatable slide mechanism, which eccentrically carries the tool-receiving means, and is rotated about an eccentric axis parallel to the base-body axis with respect to the base body in order to facilitate an adjusting of the cutting radius of the cutting tool. A second rotatable slide mechanism is provided which carries a second eccentric tool-receiving means, and is rotated about a second eccentric axis parallel to the base-body axis with respect to the base body in order to facilitate an adjusting of the cutting radius of the respective cutting tool. Furthermore, transmission means is arranged in the base body to facilitate a simultaneous driving of the two rotatable slide mechanisms.

Abstract: A tool for removing material from a workpiece includes a tool body equipped with at least one roughing head and at least one finishing head. The finishing head includes a holder containing at least first and second finishing inserts. The first finishing insert has a cutting edge which extends a distance F1 from the tool body. The second finishing insert has a cutting edge which extends a distance F2 from the tool body. The distance F1 is less than the distance F2.

Abstract: A cutter for flexible tubing supported on a mandrel having a peripheral groove at the location of the intended cut has an annulus (10) coaxially surrounding the mandrel and arranged for rotation thereabout. A blade carrier (16) is pivoted on the annulus (10) for supporting a cutting blade (17) moveable between withdrawn and cutting positions. The carrier (16) has an armature including a permanent magnet (19) which is arranged between one of the electromagnets but may be moved to the other electromagnet by an appropriate pulse of electrical energy to the other electromagnet.

Abstract: An apparatus for simultaneously forming a plurality of closely spaced, parallel grooves having a web between them in a thin-walled tube is described. The apparatus includes a tube holding mechanism, a rotating cutting tool and a device for driving the cutting tool. The cutting tool includes a single insert form cutter for forming the grooves. The insert includes a plurality of cutting blades and chip relief members which prevent chips from building up in the tool. The chip relief members are generally triangle-shaped and are disposed on the cutting edge of the insert form cutter.

Abstract: A portable machine tool for preparing pipe or other annular workpiece ends for welding includes a central mandrel shaft, a cutting head rotatably mounted on the mandrel shaft and a rotary drive connector on the cutting head arranged to concentrically fit within an annular drive head of a modular drive motor unit. The drive motor unit is restrained against torque reactive rotation by a torque reaction bar secured to the mandrel shaft so that relative rotation between the drive motor unit and the mandrel shaft is prevented. The tool is configured so that the annulus of the annular driving head of the drive motor unit can fit axially over the rearward portion of the tool for quick assembly and disassembly. The torque reaction bar is connected by a quick disconnect to the mandrel shaft to facilitate assembly and disassembly of the drive motor unit with a cutting head.

Abstract: A portable tool for squaring the ends of tubes is adapted to be coupled to an electrically powered hand drill for driving a shaft carrying a cutting tool at the free end thereof. The shaft is journaled for rotation in a tubular torque housing that is effectively clamped to the drive motor partially. Surrounding the torque housing is an axial feed housing that is keyed to the torque housing by elongated keys disposed in axially aligned keyways formed in both the torque housing and the axial feed housing. A portion of the axial feed housing has external threads adapted to mate with internal threads on a manually rotatable feed ring. A workpiece clamping collet assembly is affixed to the end of the axial feed housing such that when the feed ring is rotated, the workpiece is may be axially displaced against the spinning/cutting tool.

Abstract: A hub assembly includes a sector gear with teeth that extend over a segment of a gear circle. The sector gear has a lip along an interior circle within the gear circle and concentric therewith. The sector gear is bracketed by a pair of sector plates that have the general shape of a portion of a hollow cylinder. The lip and the plates are substantially a portion of a hollow cylinder with an inside that is a boundary of the interior of the hub assembly. A spring urges a pair of rotatable bearings into contact with a pipe that is within the hub assembly. A spring urges the blade into contact with the pipe the pipe. A motor causes a rotation of the hub assembly about the pipe, thereby cutting the pipe.

Abstract: An orbital lathe for resurfacing a fifth wheel kingpin having a support column insertable between the kingpin and an underlying surface generally axially aligned with the kingpin. A cutting tool is mounted for rotation about a pin axis and has a first positioner for moving the cutting tool radially relative to the pin axis and a second positioner for rotating the cutting tool about an axis generally orthoginal to the pin axis. A driver is provided for rotating the cutting tool about the pin axis to cause the cutting tool to remove material from the kingpin. A transport mechanism acts between the support column and the first and second positioner to move the first and second positioners and in turn the cutting tool along the pin axis.

Abstract: In a mounting mechanism for a pin mirror cutter 22, the cutter body 22 is mounted with its outer periphery inserted into the inner periphery of a cutter mounting portion. an inclined surface of a tapered portion 22 formed on the cutter body and an inclined surface of a tapered portion formed on the cutter mounting portion are in surface-contact with each other, and the diameters of the contact surfaces gradually decrease in the direction of insertion of the cutter body into the cutter mounting portion. Furthermore, these inclined surfaces and are formed by a plurality of flat surfaces so as to form regular octagonal pyramid surfaces.

Abstract: The portable lathe 10 for turning a shaft at a job site in the field includes a pair of clamping rings 12 and 14 that are adapted to be centered at spaced-apart locations along a length of a shaft to be refurbished. Extending between the clamping rings are a plurality of glide shafts 40, 42, 56, 58 which slidingly support a split-ring clamshell assembly 68. A cutting tool carrier 100 is affixed to the rotatable ring portion 74 of the clamshell assembly so that when the movable ring is driven, the tool carrier orbits the shaft being refurbished. A feed screw 98 driven by a servo motor 92 translates the clamshell assembly along the glide shafts.

Abstract: The machining unit is composed mainly of three essential elements which are the rotor, the phase displacement device and the tool drive mechanism. The rotor (100) includes a rotating shaft (1) and is equipped, for example, with four bores, extending parallel to the axis of rotation, into which the cutter carrier axles (9a, 9b, 9c and 9d) are supported. A plunge of the cutters into the material to be machined is controlled by the movement of a command sleeve (19) supporting, at its end, two surfaces (20a and 20b) of ellipsoidal form located to move, in conjunction with the inclined surfaces (14a, 14b, 14c and 14d), the command levers of the tool carrier. The command sleeve can occupy two extreme positions and one intermediary position. A phase displacement device includes a pulley (22) and a reverse pulley (25) mounted rotatably on a shaft (31) to allow angular phase change of the command sleeve (19) with respect to the spindle.

Abstract: A tool feed module for a portable lathe machine tool includes a tool block carrying a cutting tool driven by a feed screw incrementally advanced during a cutting procedure by an actuator arm contacting a striker device located on the tool housing. The actuator arm drives the feed screw through an actuator shaft and a one-way drive device permits the actuator arm to pivot in opposite directions while driving the feed screw in increments during pivotal motion in a single direction. To enable reverse rotation of the feed screw and withdrawal of the cutting tool to a starting position rapidly, the actuator shaft is connected to the one-way drive device through a releasable connection that permits rotation of the drive screw by the actuator shaft independently of the one-way drive device.

Abstract: The apparatus for scraping a cylindrical part includes a rotor and a stator. The rotor is equipped with power-driven arrangements which cooperate with power-driving arrangements on the stator for turning of the rotor relative to the stator. The rotor is formed of two parts which are joined together to form a rigid annular rotor. The rotor is freely rotatably mounted and is equipped with a set of support rollers and a set of scrapers which are controlled by centrifugal force during rotation of the rotor.

Abstract: A tube squaring tool includes a housing having forward and rearward end areas and a tubular workpiece clamping device located at the forward end area for securing and retaining a tubular workpiece relative to the housing so that the end of the workpiece can be machined by a rotary cutting head carried by the housing and movable towards and away from the end of the workpiece by manipulation of a feed mechanism. The tubular workpiece clamping device includes a pair of saddle members carried within a saddle mounting ring with one of the saddle members being frictionally secured within the mounting ring using a detent mechanism and the other saddle member being movable relative to the mounting ring and the opposing saddle member by a threaded connector that enables clamping of a tubular workpiece between the saddle members when the moveable saddle member is moved in a clamping direction towards the opposed fixed saddle member.

Abstract: A milling cutter for performing milling work on a work comprises a cutter body having a ring-shaped structure. A plurality of first tips are disposed on an inner peripheral surface of the cutter body along the circumferential direction thereof with a distance between adjacent ones and adapted to perform rough cutting work on a pin, a journal of the work and journal thrusts disposed at both ends of the journal. A plurality of second tips are disposed on both side portions of the inner peripheral surface of the cutter body along a circumferential direction thereof with a distance between adjacent ones and adapted to perform rough cutting work on side surfaces of counterweights disposed at both end sides of the pin and the journal of the work. A flat drag disposed on an inner peripheral portion of the cutter body and adapted to perform a flat cutting work on the journal thrusts.

Abstract: A thermo-shrinking film cutting mechanism used in a labeling machine, including a plurality of cutter units mounted on locating frames and equiangularly spaced around a center guide shaft, each cutter unit including a crank shaft, axle bearings, a coupling plate, an index plate, a locating plate, a cutter holder, a cutter blade and a clamping plate, a transmission mechanism driven to rotate said cutter units, causing said cutter units to cut a thermo-shrinking film, the transmission mechanism including a transmission disk having a plurality of receiving holes, which hold a respective axle bearing, which supports the eccentric upper section of one crank shaft, enabling the crank shafts of the cutter units to be rotated synchronously when the crank shaft of one cutter unit is rotated by a transmission belt through a transmission wheel, the cutter holder being slidably mounted in a transverse bottom groove on the locating plate and fixed in place by an adjustment screw to hold the respective cutter blade at the

Abstract: A cylinder member holder is used to subject the outer circumferential surface of a cylinder member to cutting machining by non-rotatably supporting left and right ends of a tubular cylinder member by left and right holders and feeding a cutting tool longitudinally of the cylinder member while causing the cutting tool to rotate about the outer circumferential surface of the cylinder member. A plurality of discontinuous solid bodies which fill the inner diameter portion of the cylinder body so as to lie along the longitudinal direction thereof are inserted via a resilient body, thereby reducing or eliminating chatter vibration produced at cutting.

Abstract: There are disclosed a cylindrical member, constituting the main body of an electrophotographic photosensitive drum or a developing sleeve adapted for use in an image forming apparatus such as electrophotographic copying machine, laser beam printer, facsimile or printer, and a producing method therefor. A work obtained by cutting a tube, is worked to a predetermined internal diameter at the left-hand end, and is supported by an opening collet of the left arbor, while the other end is supported by a closing collet of the right arbor. A cutting tool holder, supporting a rough cutting tool and a finish cutting tool, rotates around the work at a high speed, and the work is moved axially by the table. Thus, the rough cutting tool and the finish cutting tool move in the axial direction of the work while rotating along the external curved surface thereof, thus cutting the surface.

Abstract: A feed control for a tool bit carried by a headstock of a lathe includes a driving cam having a profiled lobe that permits automatic quick return of the tool bit following each cutting operation. The cam is driven in a forward feed direction by a cam actuator arm carried by the headstock of the lathe that is connected to the cam through a one-way drive clutch that converts oscillating motion of the cam actuator arm into unidirectional intermittent rotational motion of the cam. A control device is provided to adjust the incremental feed rate of the tool bit by controlling the motion of the cam actuator arm and the staring position of the tool bit between cutting cycles is adjustable.

Abstract: A rotary tubing cutter enables automatic tube cutting without requiring manual rotation of the cutter. The apparatus includes a motor driven gear assembly including a blade gear and a feed gear. The feed gear includes a plurality of cam slots that receive pins attached to the cutting blades of the blade gear. Rotation of the feed gear relative to the blade gear effects feeding of the cutting blades. The apparatus is particularly useful for fuel rod tubing of nuclear fuel assemblies.

Abstract: A cable stripping apparatus designed to strip an end of a cable that includes an outer shield and a layer of insulation surrounding a center conductor. The stripping is accomplished by removing the outer shield at a first predetermined location and by removing the insulating layer at second predetermined location. The apparatus comprises a cutting head which includes a cable guide port, one or more cutting blades with their cutting edges facing into the cable guide port and one or more blade actuating mechanisms which drive the blades into the cable guide port and into the surface of the cable to strip the cable when the cutting head is rotated about the cable end. The end of the curing head about the cable guide port is compact, permitting it to be used to strip the ends of cables located in area where larger devices could not be accommodated. The advantage of the compact head end is maintained even though centrifugal force is used to automatically actuate the cutting blades as the cutting head is rotated.

Abstract: A bar peeling tool includes a rotatable cutter head with circumferentially spaced cassettes. Each cassette comprises a toolholder and an adjusting device. The adjustment device comprises a setting unit provided with a protrusion which fits into an end of the toolholder. The protrusion includes a recess in which a wedge element is slidable. By sliding the wedge element, the toolholder is adjusted along a longitudinal axis of the cassette. Sliding of the wedge element is performed by means of set screws mounted in the toolholder at opposite ends of the wedge element. A clamping screw extends between the setting unit and the toolholder for clamping the wedge in the radial direction.

Abstract: The present invention provides a tool for bar peeling comprising a rotatable cutter head with circumferentially spaced toolholders each of which is provided with a U-shaped recess along one of its side surfaces. A wedge shaped element is longitudinally displaceable in the U-shaped recess so that an insert carried by the toolholder in subjected to radial adjustment upon a longitudinal displacement of said wedge shaped element.

Abstract: A clamping device is furnished, in particular for peeling machines for metallic bars (21) and tubes. The clamping device clamps the workpieces in a defined way at a preselected position (99) and independent of the diameter of the workpieces. The clamping device includes means for synchronization (64-69) of the motion of the clamping rollers (31, 32). The clamping position of the bar to be clamped can be varied by an adjustment device. The means for synchronization (64-69) of the clamping motion transfer a preselectable part of the clamping force, which is furnished such that the means for synchronization are held free from play via preclamping, during in all clamping phases. This eliminates vibrations of the bar (21) together with the clamping means (31, 62; 32, 63) or any undesired shifting of the clamping position.

Abstract: A tool for bar peeling of solid or hollow bars includes a rotatable cutter head and a plurality of toolholders distributed around its periphery. Each toolholder is provided with a roughing insert and a finishing insert. The edge surface of each roughing insert intersect with the top surface to define three separate cutting edges whereby adjacent pair of these edges intersect at obtuse angles ranging from 120-140 degrees. The cutting edges of the roughing insert are convexly curved, whereas the cutting edges of the finishing insert are basically linear.

Abstract: A peeling machine (1) includes individual device groups (2, 5, 63, 7) which can be centered and clamped at guide rails (23, 24). The guide rails also furnish a particular sliding possibility for a selective moving apart of individual device groups (2, 5, 63). This allows for maintenance, inspection, and repair of the device groups, which are made accessible by moving the individual device groups apart without any heavy equipment. The device groups, which are not to be separated during the pulling apart of the peeling machine at the guide rails, are connected to each other (64, 65) such that the peeling machine can be separated and subdivided at the desired location. The guide rails extend parallel to the rotation axis (62) of the cutter head (26) of the peeling machine and can be quickly bolted and released.

Abstract: A multi-cornered cutting insert includes a corner cutting edge at each corner, and a chipbreaking recess spaced inwardly of each corner cutting edge. The recess is curved as the insert is viewed in plan. A clearance face for each corner cutting edge has a clearance angle which progressively increases toward the respective corner.

Abstract: A rotary driven spindle (6) comprises sliders (14, 64) arranged on its front face, which can be adjusted radially as the spindle (6) rotates. To this end, an adjustment mechanism (21) comprises a device component (8) which rotates with the spindle and which can be moved relative to the spindle in order to adjust the slider (14). The radial centrifugal, frictional and working forces transmitted to the bearing housing (7) by the adjustment mechanism during adjustment of the slider (14) are compensated to a controllable extent by compensation of the centrifugal forces directly between the spindle and the device component (8). The compensation is effected by means of centrifugal weights (16, 66), the centrifugal force of which is deflected into axial forces. In one embodiment, the centrifugal weights (16, 66) penetrate a gap (12, 13) which tapers outward between two front faces (12, 13) of the component and the spindle.

Abstract: A machining unit, in particular in a numerically controlled lathe, has a rotary head equipped with four pivoting tools for machining parts which pass axially through this head without rotating. Each tool is mounted on a respective pivoting support (6a-6d) provided with a helicoidal guiding surface (26a-26d) the axis of which coincides with the pivoting axis (7a-7d) of the support. The four tools are controlled by means of two concentric annular sockets (30, 42) controlled in translation. The inner socket (30) has two outer surfaces which rest against the guiding surfaces (26a, 26b) of two of the supports. The guiding surfaces are helixes of opposite pitch, and therefore one of the corresponding tools moves toward the part as the second tool moves away from it. The outer socket (42) controls the other two tools in the same manner.

Abstract: A pipe machining apparatus includes a tool carrier, with a frame attachable to a pipe for rotatably mounting the tool carrier. The tool carrier is circumferentially rotatable about the pipe and carries a tool for performing cutting or machining operations on the pipe. A plurality of rotatable bearings are provided between the frame and the tool carrier, and the bearings are individually adjustable in a radial direction to compensate for wear of the bearings during use of the apparatus.

Abstract: A centerless turning machine for rods. The machine includes a cutter-head mounted at the front end of a rotating hollow shaft, and further includes a plurality of advancing rollers of an infeed device operatively mounted at the inlet end of the turning machine. The turning machine further includes a front guide mechanism and a rear guide mechanism, respectively mounted on opposite sides of the cutter head, and also includes a clamping carriage which is mounted on the outlet side of the turning machine. The rear guide mechanism takes the form of a tubular support which is provided with a flange mounted in the machine housing and which extends into the rotating hollow shaft. The rear guide mechanism has, at its free end, which protrudes into the hollow shaft, three individually spring biased guide elements for the rod. The springs for each individual guide element form a first resilient abutment for each guide element. The movements of the three guide elements are synchronized by a rotatable ring.

Abstract: A tool head (12) through which work bars (35) to be machined can be pushed and which is adapted to be driven in rotation is supported on a head stock (11). The head stock (11) is disposed between a rear feeding means (57) and a front chuck means (25). The rear feeding means (57) is designed for steadily advancing one work bar (35) at a time up to the chuck means (25) and is movable into a position ready to take up another work bar (35) before the preceding work bar (35) has been used up. The front chuck means (25) is designed to grip a portion of the work bar (35) pushed through the head stock (11) and the tool head (12) and to exert forwardly directed axial pull on the same, and it can be pushed axially back and forth by its own feed drive means (27) independently of the rear feeding means (57). That makes it possible to replace a used up work bar (35) by a new one in simple manner, in little time, and without any risk of an accident.

Abstract: The invention is a method and apparatus for sawing bar-shaped workpieces o slices by means of an annular saw. The saw blade deviation, from its nominal position in the axial direction during the sawing operation, is compensated for. According to the invention, the deviation can be compensated for by the workpiece and the clamping system of the saw blade performing an appropriate relative translatory axial movement in accordance with the measured deviation. This movement is conveniently controlled by a computer, which compares the actual and nominal position of the saw blade with one another. The method can be used especially in the sawing of semiconductor bars.