Abstract: A tool head, in particular a fine adjustment head for use in machine-tools, may be coupled to a rotary machine spindle (26) and has a slide (16) that may be adjusted transversely to the axis (12) of the base body and is provided with a projecting tool-receiving part (14) on its front face. A measurement arrangement (18) is provided for directly measuring the adjustment path of the slide (16) in relation to the base body (10). The tool head further has an adjustment motor (20) that acts on the slide (16) in the direction of adjustment and an external current supply arrangement (22) for electronic components integrated into the tool head and for the adjustment motor (20). In order to obtain a compact design with high adjustment precision, the adjustment motor (20) is arranged with its cylindrical housing (45) in a recess (46) of the base body (10) that extends transversely to the direction of adjustment of the slide (45) and to the axis of the base body.

Abstract: A clamp for indexable inserts used especially for turning. The clamp consists essentially of a clamp shaft and a clamp head combined with it in one piece. The clamp shaft can be secured to an axis-parallel clamping surface of a tool holder by a supporting surface obliquely transfixed by a clamping screw. The clamp head has an open-edged recess to take the indexable insert, one effective cutting corner of which projects on one side beyond the outer surface away from the support surface. In order to be able to adjust the distance between the clamping surface and the cutting corner, the clamp head has, in the free region between the recess, the supporting surface and the clamp shaft, a slot-like aperture having a curved cross-sectional shape open towards the clamp shaft. The clamp head can be elastically bent with respect to the clamp shaft under the effect of an adjuster.

Abstract: A machining tool for the fine machining of internal surfaces, with a blade carrier and cutting inserts preferably attached releasably thereto. An adjusting device for the precision adjustment of the cutting edge is provided. The blade carrier has at least one slit located closer to the longitudinal axis of the machining tool than is the cutting insert, thus creating a blade carrier segment which can be essentially radially adjusted and which carries the cutting insert and which is connected in one piece with the remaining blade carrier. The degree of freedom of the blade carrier segment permitted by the slit can be stabilized via adjusting device.

Abstract: A drill including a bit having an extension received in and axially extending groove formed in the end face of the drill base body, a side cutting edge projecting beyond the base body circumference, and two active end cutting edges projecting beyond the end face of the base body, with the drill further including clamping elements for securing the bit extension in the base body groove with a possibility of radial adjustment.

Abstract: In known tool holders only a single screw is used to compensate for axiality faults which exist. It is true that this is a simple construction, but it is not adequate for sensitive compensation of axiality faults requiring attention, particularly in fine drilling. According to the invention this is achieved in the case of the invention by using a tangential tension screw 73 to move towards one another the two sectors 78, 79 of a compensator ring 13, so that the adapter 14 can be sensitively moved into a position in which the geometrical longitudinal axis 17 of the tool 93 becomes coaxial to the spindle axis.

Abstract: A deburring tool, and a cutting tool blade and pivot member therefor. The arbor is formed with a cutting blade recess for a cutting tool having a flat resilient blade. The blade is releasably secured in the recess by a pivot member extending transversely through the recess. The cutting tool blade includes an open-ended slot having an arcuate closed end and one or more flat surfaces. The pivot member has a shank portion with arcuate and flat sides, and is selectively rotatable in the cutting blade slot between a locked position preventing separation of the blade from the pivot member, and an unlocked position permitting separation of the blade and pivot member.

Abstract: An adjustable cartridge assembly is provided for a cutting head of a machine tool. The cartridge fixes the back rake angle of the cutting blade so that mere radial adjustment is required to adjust the blade. Moreover, the cartridge includes a support portion that matingly receives the blade and provides support along three contiguous surfaces.

Abstract: A removable boring tool cartridge has a cylindrical tool carrier axially adjustable in a bore in a cartridge housing by means of an adjusting screw having a head rotatably adjustable in the bore of an annular thrust bearing, which is secured around the outside thereof in one end of the bore in the housing by an injection molded plastic safety ring. The adjusting screw has an externally threaded shank that projects in radially spaced coaxial relation into a bore in one end of the tool carrier, to the opposite end of which is fastened an insert holder. A plastic sleeve nut is injection molded into the radial space in the bore in said tool carrier to surround and have driving engagement with the externally threaded shank of said screw.

Abstract: A deburring tool including an elongated arbor formed with a cutting blade recess, a unitary cutting tool having a cutting head, a trailing terminal portion, an elongated, flat resilient blade extending therefrom which is received in the recess and a mounting mechanism securing the cutting tool to the arbor. The mounting mechanism includes an adjustable screw threadably mounted in the arbor transversely of the longitudinal axis of the arbor for fixedly engaging the terminal portion of the cutting tool. The mounting mechanism also includes an adjustable locking screw extending transversely through the recess and the blade to define a pivot point about which the cutting tool can pivot and has a non-threaded hemispherical portion which terminates in a flat edge. The resilient blade includes an open ended slot having an arcuately closed end which presents a flat at one end of the arc of the slot.

Abstract: An insert for chip removing tools has a housing (10) that can be inserted in a recess in the base body of a tool. A threaded sleeve (16) is rotatably mounted in the housing (10) so as not to slide under the effect of an axial force. A machining blade insert holder (14) is non-rotatably guided in the housing (1) and is provided with an adjustment thread (21) that engages the threaded sleeve (16). The machining blade insert holder (14) is axially moved by rotating the threaded sleeve (16) and carries a reversible machining blade insert (12) on its head (18) that projects beyond the housing (10).

Abstract: The invention concerns an adjustable tool for use in machine tools, with a slide (14) which can be fitted with at least one cutting tool and which can be displaced relative to the rotating main body (10) perpendicularly to the axis of rotation. The invention also calls for a device (20) for the direct measurement of the displacement of the slide (14), the slide being fitted with an electronically read measurement scale (24). This device comprises battery-powered data-processing electronics (20) and is located inside the main body (10). The displacement reading can be presented on a digital display (26) which is also mounted in the tool head.

Abstract: A tool holding fixture having a rotationally symmetrical holding body and a shaft that form one piece. The one piece has an axially directed first annular groove which is concentric with the shaft and is positioned in a transition area between the holding body and the shaft. The shaft has an annular collar with a flank which is inclined in a direction toward the first groove. The rotatable clamping ring encompasses the collar and engages the first annular groove. The rotatable clamping ring is seated on the shaft. The clamping ring has a second annular groove in which wedge-shaped sliding blocks are seated and are radially and axially moveable, but secured against canting within the second groove. The sliding blocks are supported on the inclined flank of the collar. A pressure screw is threadedly engaged within the clamping ring.

Abstract: A machining tool for adjustably securing a replaceable cutting member thereto. A tool head is provided with a flat ledge portion at one end, a positioning screw assembly for adjusting the position of a cutting member on the flat ledge portion, and a securement screw assembly for securing the cutting member to the tool head.

Abstract: A reamer having a single cutting blade with parallel clamping and seating surfaces seated in an anvil having converging radially outward extending planar surfaces for enhancing the clamping effectiveness of an installed anvil/cutting blade adjustably positioned radially by a pair of set screws angled to provide fine adjustment.

Abstract: There is provided by the present invention a surface contouring tool useful for reaching otherwise inaccessible working surfaces such as large diameter gas turbine engine rotor inner surfaces, the invention including a machining head means extendable from a nonworking position to a working position relative to the working surface and when the machining head means is useful for EDM or ECM machining further includes a fluid flow path for providing a machining fluid to the working surface head and means for rotating the machining head means.

Abstract: An adjustable boring head that includes a main body member having a longitudinal axis, and a boring bar holder adjustably mounted in the main body member for slidable adjustments transversely across the longitudinal axis. A square cross-sectioned slideway is formed in an end face of the main body member for precise guidance and rigid support of the boring bar holder. The boring bar holder is a unitary one piece structure having a deep socket opening for rigidly mounting the boring bar.

Abstract: A boring and surfacing machine (12) has a rotatable carriage (15) on which a tool carriage (16) is axially moveable. The tool carriage (16) supports a tool post (18). The tool carriage (16) and the tool post (18) can be driven axially and radially respectively, by means of lead screws (46) and (58). The rotatable carriage (15) can comprise two or more rails (36) enabling the dimensions of a work piece to be measured while the machine is in position and also to provide a relatively high moment of inertia.

Abstract: A method and apparatus for machining the inside surface of the two halves of the hollow casing of a machine or the like with the two halves positioned and mated together to form the closed hollow casing thereby providing machined areas on the inside surface of the two halves which are symmetrical and in line. The apparatus comprises a support structure in the form of a boring bar extending through the closed housing. A pair of spaced bearings in the closed hollow casing rotatably support the boring bar. Positioning apparatus is operatively attached to the boring bar for rotating and axially positioning the boring bar within the closed hollow casing. Support assemblies are positioned within the closed hollow casing and are attached to the boring bar to move with the boring bar. Cutter devices are attached to the support assemblies and are movable in a radial direction with respect to the boring bar to machine the inside surface of the closed hollow casing.

Abstract: A boring bar has a body formed with an axial cut at the portion near its tip to define a pair of cut-apart portions. Insert mounting portions are provided on mutually opposite ends of the cut-apart portions at a tip end of the cut. A dimension adjusting mechanism is provided at an intermediate portion of the cut-apart portions. A dimension adjusting mechanism is provided at an intermediate portion of the cut-apart portions to change a boring diameter between the tips of cutting edges of inserts mounted on the insert mounting portions by moving the cut-apart portions along surfaces of the cut. A fixing screw is provided between a tip of the cut-apart portions and the dimension adjusting mechanism to fix the cut-apart portions together after adjusting the dimensions.In another arrangement, another cut is formed in the bar body at its end opposite from the end on which the inserts are mounted. A covering member is mounted on the bar body to cover this cut.

Abstract: The present invention relates to a boring head constituted by a body (1) provided with a radial piston (2) for reception of a boring tool (3) gripped by means of a screw (4), said piston (2) being adjustable in position by means of a micrometric screw (5), characterized in that the body (1) is provided also with a slide block (6) effecting the guidance, the orientation and an end-of-movement abutment for the piston (2) for reception of the boring tool (3) and with a balancing device (7) with independent counterweights (8 and 9).

Abstract: A boring head with a longitudinal axis includes a leading cutting portion and a trailing portion. A pair of adjustable work engagement devices are releasably secured to the leading portion by individual fasteners. Individual mechanisms for adjusting the position of each of the work engagement devices in a first direction generally parallel to the longitudinal axis of the boring head, and individual mechanisms for adjusting the position of each of the work engagement devices in a second direction, generally transverse to the first direction, are provided. The first and second direction adjusting mechanisms are positioned coaxially of each other in the boring head. Each work engagement device is adjustable in the first and second directions individually and independently of the other.

Abstract: A mechanism for clamping a tool (e.g. a probe) and a shank together comprises a clamping pin (144), which bears against an annular lip (142) in the rear face of the probe. A shaft (148) of the pin (144) extends into the shank (150), and two diametrically opposite, radially extending clamping bolts (160) supported by the shank (150), bears against a frusto-conical clamping surface (158). The action of the bolts (160) on the surfaces (158) urges the probe and shank together. The probe and shank are adjusted laterally relative to each other by four adjusting bolts (166) supported in the annular lip (142) which bear against a flange (152). The flange (152) is provided on the shank (150) and extends into the probe (140).

Abstract: A compact boring system 20 for machining the interior surface of cylindrical shapes, such as steam turbine valves and rotors in a field situation. The apparatus is designed to set up in the object itself. A boring bar 26 is rotatably disposed in a pair of roller bearing supports 23. A plurality of locating buttons 29 extend radially from the bearing supports 23 to contact the interior of the object and support the apparatus therein. The bearing supports 23 can be secured to the boring bar 26 at any axial location thereon. A machining head 35 is also securable to the boring bar 26 at any axial location, and includes a threaded drive shaft 38 for translating the machining head 35 axially along the bar 26. A cutting tool 56 is disposed in the machining head 35 so as to be radially adjustable with respect to the axis of the bar.

Abstract: Device for the automatic engagement of the feed movement and of the return movement of the tool slide of a boring head, in which a gear rim is arranged on the inside of the head housing, which gear rim is provided with radially projecting pins, on which camlike thickenings of a ring are mounted, which interacts with vertically arranged cylindrical pins, which are acted upon via spring means, the cylindrical pins being arranged in a position which is pressed downwards in such a manner that they act upon a control disc, which is in work connection with a control cylinder which has a peg, which interacts with a displaceable sleeve and serves to bring a toothed wheel with spur gearing or a second toothed wheel with spur gearing into work connection with a first gear arrangement or with a second gear arrangement respectively and that furthermore means are provided, which form part of a gear arrangement, in order to carry out the feed movement or the return movement of the tool slide.

Abstract: Apparatus for adjusting the radial displacement of a member, such as a tool bit, from a rotational shaft, such as a boring bar used in a boring operation. An aperture in the boring bar supports the tool bit, allowing it to protrude radially outwardly from the boring bar. An adjustable feed mechanism in the aperture adjustably feeds the tool bit along the aperture. An adjusting mechanism couples with and facilitates adjustment of the feed mechanism. A calibrating mechanism on the adjusting mechanism, and on the boring bar, calibrates adjustment of the feed mechanism by the adjusting mechanism.

Abstract: A boring attachment has a boring head with a transversely adjustable slide for setting the boring cutter. The slide has a bore for receiving (clamping) a holding device, at a length which is adjustable in the axial direction, so that the holding device is longitudinally displaceable by an amount equaling at least twice the diameter of the recess. Loading at the cutter holder is essentially completely eliminated when the holding device is located in a transversely displaced position which is within the principle operating range of the boring head by providing appropriate bores in the body of the boring head. A relatively small overall height for the boring head contributes to optimal stability of the boring attachment.

Abstract: To center a tool restrained within a collet coupled to a driven portion (9) which, in turn, is coupled to a driving portion (2), and to compensate for possible axial offsets of the respective portions, a coupling element connects the driving and driven portions and two first spring elements (23, 24) are located on the driving portion, two further spring elements (31, 32) are located on the driving portions offset with respect to the first spring elements of 90 degrees. Each one of the spring elements can be adjusted with respect to a centrally located counter support portion (29, 31) by adjustment screws passing through the spring elements and bearing against the counter support, to thereby position the axis of the driven portion (9) carrying the collet, in congruence with the axis of the driving portion (2) even if there are manufacturing tolerances or other offset conditions, such as tolerances in the tool clamped in the collet.

Abstract: A valve seat refitting apparatus. A cylindrical main body portion has a longitudinal bore which receives a centering guide. Longitudinal slots around the outer periphery of the main body portion receive cutting blades rigidly attached to cutting blade support. Radial and longitudinal positioning screws serve to position the supports and cutting blades to refit a variety of valve seats. Set screws lock the blade supports in the desired position. A bushing removably attached to the centering guide also allows the centering guide to be adapted to fit different size valve seats.

Abstract: In a drill bar having a transverse slot, in which a cutter assembly having two diametrically oppositely positioned cutters is inserted, the cutter assembly has a housing from which the outer cutting edges of the cutters are outwardly extended. Each cutter is formed of a one-piece made of high-strength material and has an inner cutting edge and an inner and outer inclined wall adjusted to an inclined wall of the tapered tip of the adjustment bolt which is inserted into the recess formed in the housing to adjust the distance between the outer cutting edges of the two cutters in dependence on a hole to be drilled.

Abstract: Coarse/fine adjustment boring head employing a transverse sleeve threaded into and extending through a boring head body providing coarse incremental radial adjustment of an insert cartridge, axially oriented within a sleeve, together with a fine radial adjustment of the cartridge relative to the sleeve effected through a differential screw having differential pitch threads with lead in the same direction.

Abstract: A boring head for precision jig boring and characterized by a body with a transverse bore and carrier lapped therein to carry a boring bar eccentric to a turning axis and held erect by an adjustment, and a micrometer adjustment anchored by an anti-backlash adjustment and positionably engaging the carrier through an anti-backlash adjustment, there being a lock for the adjusted position of the carrier.

Abstract: A rotary cutting tool including an elongated generally cylindrical holder having a recess into which is fitted a disposable cutting insert. The insert is held in place by a clamping member which bears against a surface of the insert and which is attached to the holder by a clamping screw. Radial adjustment of the insert can be effected by adjusting screws which have camming surfaces which bear against a corresponding camming surface of the insert. In axial cross section, the axis of each adjustment screw is parallel to the axis of the clamping screw and to a horizontal axis of the holder, and an axis of the insert is at an angle relative to a vertical axis of the holder.

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

Abstract: A boring head having a diametrical bore adjacent the working end thereof for insertion and removal of two or more interchangeable cutter holders. The cutter holders are restrained against rotational movement within the bore but not axial movement, whereby rotation of a first drive member having threaded engagement with an internally threaded longitudinal bore in the cutter holder will cause radial adjustment of the cutter holder relative to the boring head. Rotation of the first device member is accomplished by rotation of a second drive member having a gear drive connection with the first drive member. A first micrometer dial on the outer end of the first drive member provides for rough orientation of the cutter holder during such radial adjustment thereof, whereas a second micrometer dial on the outer end of the second drive member provides for extremely precise measurements of such radial adjustment.

Abstract: The present invention is directed to a boring head tool apparatus. A new method of making the tool as well as structure which allows use of the indicated method and leads to several advantages combine to overcome problems of the art to increase boring accuracy to at least 0.0001 inch. The tool includes a slide which is moved with respect to the body of a primary member using a differential screw technique. The differential screw is located within the dovetail, while the tensioning screw is located beneath the dovetail.

Abstract: The invention has as an object to provide a reliable, failure-free tool holding apparatus which allows digitization of a tool holding apparatus having a tool moving function, is free from various problems encountered upon digitization, and does not cause an erroneous operation upon scattering and attachment of chips or cutting oil. In order to achieve this object, a scale member and a moving amount detecting means are arranged to oppose each other. The scale member is arranged at the side of a slide movable in a predetermined direction, and is moved following the movement of the slide. The moving amount detecting means is arranged at the side of the main body and supplies a predetermined number of oscillation pulses to a display in accordance with the moving amount of the scale member. The scale member is enclosed with stretchable members such as bellows members, and is moved in the enclosed, sealed space.

Abstract: A tool kit is provided for repairing the snap ring grooves of a cam follower bore in a diesel engine cylinder head without removing the cylinder head from the cylinder block. The tool kit includes a cutting tool which will both enlarge the cam follower bore to allow the use of an oversized spring retainer and cut an enlarged snap ring groove to allow the use of a more substantial plate-type snap ring. A snap ring installation tool allows for easy placement of the snap ring in the cam follower bore. A concentric wrench having concentric yet independently movable sockets for quick valve and fuel injector clearance adjustment is included.

Abstract: An automatic feed device for a facing head comprising a shank mounted to the main shaft of a machine tool, a body coaxial with the shank, a tool holder slidably fitted thereto, and an operating ring rotatably fitted between the shank and the body is disclosed. The automatic feed device comprises a worm shaft disposed at the body, clutches and worm wheels, a gear meshing with a stationary gear of the operating ring, a feed gear engageable with feed pins thereof, an internally threaded worm wheel meshing with the worm wheel, a feed screw engageable with the internally threaded worm wheel, a shifter connected to the clutches, a shifter driving shaft engageable therewith, a shift lever constituting a cam, a forked connecting member connected to the shifter driving shaft, a press lever adapted to press a cam roller against the cam, and a feed direction detecting lever connected to the shift lever.

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: 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 machine tool (10) with a rotating cutting tool (24) has a spindle assembly (20,48) mounted for rotation in a longitudinally movable headstock (18). The spindle assembly includes a spindle (48), driven by a motor (50) and an integral machining head (20) having a rotatably mounted drive screw (62). The drive screw carries a radially positionable follower (72) to which is connected a tool block (22) to define a radial slide for supporting the cutting tool. A drive shaft (82) extending through the spindle is in driving engagement with the drive screw such that rotation of the drive shaft relative to the spindle produces rotation of the drive screw and consequential radial movement of the follower and tool block. A motor (76) mounted on the spindle for rotation with the spindle is connected to the drive shaft for rotating it either a clockwise or counterclockwise sense to produce radial movement of the follower and tool block.

Abstract: A circular cutter 10 has a drive shaft 11 that turns a beam 30 bearing one or two cutter knives 50 rotated within a drum 20 mounted on shaft 11 to surround beam 30. A pressure shoe 25 on the bottom of drum 20 has a central opening 26 within which cutter knives 50 can turn, and drum 20 is biased downward relative to shaft 11 and beam 30 so that pressure shoe 25 engages and holds a work piece 60 as it is cut. Pressure shoe 25 is preferably interchangeable to afford different sizes of central openings 26 for different radii of cuts, knives 50 are preferably radially adjustable along beam 30, and drum 20 is preferably transparent to serve as a guard that the user can see through.

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 cam-controlled boring bar system (100) includes a first housing (152) which is rotatable about its longitudinal axis (154), and a second housing in the form of a cam-controlled slide (158) which is also rotatable about the axis (154) as well as being translatable therealong. A tool-holder (180) is mounted within the slide (158) for holding a single point cutting tool. Slide (158) has a rectangular configuration and is disposed within a rectangularly configured portion of the first housing (152). Arcuate cam slots (192) are defined within a side plate (172) of the housing (152), while cam followers (194) are mounted upon the cam slide (158) for cooperative engagement with the cam slots (192). In this manner, as the housing (152) and slide (158) rotate, and as the slide (158) also translates, a through-bore (14) having an hourglass configuration will be formed within a workpiece (16) which may be, for example, a nuclear reactor steam generator tube support plate.

Abstract: A reamer comprises a single, adjustable, elongate carbide blade clamped in position in an axial slot in the reamer periphery by means of a clamping plate, with the slot having a positive rake blade supporting fade so that the blade is adjustable along a line parallel to a tangent to the reamer periphery.

Abstract: A diamond point type dressing tool with means for adjustment to dead center within a tolerance of .+-.0.0001" is mounted to a control head assembly capable of producing horizontal, rotary and vertical movements of the tool either independently or simultaneously to reproduce from a remotely disposed associated template any desired contour of angles and radii on the peripheral edge of a grinding wheel. A tracing rod, snugly but slidably journalled through a support ball, has a tracing end adapted for manual movement over the profile of the template and a control end operatively associated with the control head for reproducing the template profile in the movement of the dressing tool and for rotating the diamond point where necessary on the profile. The ball support is seated in the control head and is fixed against lateral or vertical movement but has the capablility of turning in place as the orientation of the axis of the rod is changed during movement over the profile.

Abstract: A tool is disclosed that offers precision fine adjustment of a cutting tool bit on the tool, having an opening provided with a conical seat, an internally-threaded tool adjustment cartridge having a conical surface engageable with the conical seat, an externally-threaded tool ajustment member threadably engaged within the cartridge, a tensioning mechanism for maintaining the conical surface in self-centering engagement with the conical seat, external gear teeth on the cartridge, and a worm wheel engageable with the external gear teeth of the cartridge to provide for very small movements of the cartridge. Fine adjustment can be performed automatically or manually, and may be performed by access to either axial end of the tool, or to the side thereof adjacent the tool bit.

Abstract: A boring machine comprises a hollow rotary spindle, a pair of swing arms attached to the front end of the rotary spindle to extend in symmetric radial directions with respect to the rotary spindle, and a driving mechanism disposed within the rotary spindle for driving the swing arms. A pair of rams can be assembled respectively in the swing arms to be symmetrically movable in radial directions and a ram driving mechanism is also disposed in the rotary spindle. Cutters are supported to the front ends of the swing arms or rams.

Abstract: A boring tool or like rotating tool, especially for a NC machine, is provided with a laterally projecting plunger which can be brought into contact with an abutment of the machine by the tool position mechanism therein to operate a stepping mechanism within the tool and correct the position of the cutting edge therein.

Abstract: A reamer comprises a single, adjustable, elongate carbide blade clamped in position in an axial slot in the reamer periphery by means of a clamping plate, with the slot having a positive rake blade supporting fade so that the blade is adjustable along a line parallel to a tangent to the reamer periphery.