Abstract: Provided is a boring tool which not only is lightweight but also has both abrasion resistance and high stiffness. More specifically, provided is a boring tool wherein a shaft-like tool body (10) is equipped with cutting bits, and wherein the tool body (10) makes a reciprocating motion, thereby reaming a hole provided to a workpiece to be machined. The tool body (10) is provided with a substrate (11) formed by a carbon fiber reinforced composite material, a hard plating layer (13) consisting of hard plating applied to the surface (10b) of the tool body (10), and a backing layer (12) which is applied between the substrate (11) and the hard plating layer (13) and serves to improve the wettability of the hard plating layer (13).

Abstract: An improved portable boring bar apparatus includes a small hydraulic motor and drive mechanism for rotating a cylindrical boring bar and axially advancing it in the cutting direction. The boring bar is received in a drive housing, and a support arm affixed to the drive housing includes a bearing for rotationally supporting the boring bar, and a mounting tongue that extends radially beyond the drive housing for attachment to a workpiece mounting arm. At set-up, the workpiece mounting arm is temporarily joined to a set-up support arm identical to the drive housing support arm, and the arms so joined are positioned such that the bearing of the set-up support arm is centered relative to a workpiece pilot hole. The workpiece mounting arm is tack-welded to the workpiece, and the drive housing support arm is joined to the workpiece mounting arm in place of the set-up support arm.

Abstract: A machine for boring spaced, axially-aligned surfaces of a part includes a frame and a boring apparatus associated with the frame. The boring apparatus is configured to bore at least one surface of the part and includes a boring bar associated with a cutting tool configured to rotate about a longitudinal axis of the boring bar. The machine further includes a mounting fixture associated with the frame configured to mount the part in a fixed relationship with respect to the frame. The machine also includes an alignment assembly including at least one pair of plates. At least one of the plates of the pair of plates is configured to pivot such that the longitudinal axis of the boring bar is aligned with an axis defined by the axially-aligned surfaces of the part.

Abstract: A horizontal boring machine tool is described that includes a boring bar equipped with a cutting bit and a counter-bar coupled in head-to-head rotation with the boring bar. This counter-bar is also equipped with a cutting bit, or a series of cutting bits destined to operate simultaneously on the same cylindrical seat to be bored. Both the bit or bits arranged on the bar, and the bit or bits arranged on the counter-bar are radially adjustable via an automatic adjustment system.

Abstract: A method is provided for forming enlarged cylinder bores in an engine based on a family of internal combustion engines having an original cylinder bore axis for each bore, wherein each cylinder bore is constrained against enlargement toward one side. The method includes providing an offset axis parallel to the original cylinder bore axis and spaced toward an opposite side of the cylinder bore by a dimension equal to one half of a predetermined bore diameter enlargement, and centering the enlarged cylinder bore on the offset axis. The method preserves a minimum wall thickness from the cylinders to camshaft bores between the cylinder banks while the outward enlargement dimension is preferably limited to a value which does not require changing the cylinder head bolt pattern or reduce the wall thickness below minimum values in other portions of the cylinders.

Abstract: An internal cavity cutting tool assembly includes a tool body, a tool hanger, and a bearing assembly. The tool hanger body has a through-bore that is adapted to receive the bearing assembly. The tool body has first and second body portions, each having an arbor bore, a cutting face having a plurality of indexable cutting inserts, and a bearing support surface. The bearing support surface of the second tool body portion is also received by end of the through-bore, such that the bearing support surfaces of the tool body portions oppose each other within tool hanger body. An arbor drive shaft and a support are operatively inserted though openings in a workpiece and through the arbor bore of the tool body. The arbor drive is retained in a milling device to operatively rotate the tool body assembly while precisely locating the tool hanger assembly, thereby sweeping the cutting inserts against the portions of the workpiece to be cut.

Abstract: A tool having a base body which carries cutters for machining bores in a workpiece, the cutters being arranged coaxially with one another. The base body further has at least one lifting element, with which the base body can be moved from an eccentric position in relation to an axis of the workpiece bores into a central position, in which the axis of the tool coincides with the axis of the workpiece bores.

Abstract: A process is proposed for chip-removing machining of bore surfaces spaced at a distance from one another in axial direction, particularly of crankshaft and/or camshaft bearing bores, in which at least one of the two outermost bore surfaces is machined to produce a bearing surface for the machining of additional bore surfaces, and a boring bar is inserted through one of the machined outermost bores into at least one bore lying between the outermost bore surfaces.

Abstract: A portable boring/facing machine having a rotatable boring bar on which is supported a cutting head assembly that is adapted to be axially translated by a lead screw drive powered by an AC variable speed servo motor is provided with mounting brackets attachable to the work piece that incorporate a swivel mechanism for facilitating alignment of the boring bar with the centerline of the work piece.

Abstract: A device for machining bores in a workpiece has a tool with a base member and cutting blades mounted on the base member for machining coaxial bores in the workpiece. At least one guide bearing for supporting the tool is provided. The at least one guide bearing has a guide bearing axis coaxial to the workpiece axis. The tool and the at least one guide bearing are shaped such that the tool is guided and centered in the machining position of the tool by the at least one guide bearing and is insertable and removable in a radial offset position from the bores and the at least one guide bearing.

Abstract: A line boring apparatus comprising a motorized spindle and tool support mounted on a support frame for motion along two axes perpendicular to a rotational spindle axis. The spindle is also supported for motion along the spindle axis relative to the tool support. A tool cradle is supported beneath the spindle on the support frame and stores boring bars of differing outside diameters equipped with support bushings having outside diameters equal to an inner diameter of the tool support. A CNC is programmed to actuate an axes drive to cause the spindle to select a boring bar and bushing from the cradle. The CNC and axes drive then move the bar and bushing to a predetermined boring position axially aligned with an interrupted line bore to be machined in a workpiece.

Abstract: A precise finish machining of bearing bores (25) at crankcases (26) is made feasible by way of a device with tow skid-guided spindle boxes (1, 2), the drivable spindles of which are in flush alignment. One spindle is designed as a working spindle (3) carrying a radially adjustable tool (11), while the other spindle is designed as a guide spindle (4) engaging with a guide pin (6) into a front-end bore (5) of the working spindle (3). The guide pin (6) is succeeded by a cone (7) on which the adjustable tool (11) is supported, and where a measuring key (14) is located between the cone (7) and the base (12) of the bore (5), the measuring signal from said measuring key serving for control of the distance between both spindle boxes (1, 2) and thus for control of the radial excursion of the tool (11).

Abstract: A boring bar for machining of borehole surfaces which are arranged axially spaced from each other, in particular crank-shaft and/or cam-shaft bearing holes. The bar has at least one, and preferably a plurality, of cutting devices and at least one, and preferably a plurality of, guide devices each associated with a cutting device. A fluid pressure actuating device acts on both the cutting devices and the guide devices. The actuating device effects a setting movement of each of those devices against a respective defined stop by application of fluid pressure through the boring bar to the cutting devices and the guide devices.

Abstract: A method and machine for repairing overhead cam engine cylinder heads and the like. The method includes the steps of removing the caps from the bases of the bearing towers or housings, removing material from the legs of the caps to reduce their height, replacing the caps on the bases, and boring the resulting bearings to produce bearings of the proper diameter. The machine includes a device for machining a bearing cap and a device for boring the bearings. The device for boring the bearings has a boring bar that is supported only at opposite ends of the cylinder head. The bar does not sag or chatter because it is made of an extremely hard and dense material such as a dense tungsten alloy or a ceramic-coated metal.

Abstract: An axle pivot boring tool is disclosed. Such tool comprises a plate having an enlarged circular aperture in a central extent thereof. A plurality of small apertures are symmetrically located therearound. A plurality of peripheral holes for mounting the plate on the upper extent of a tractor are provided. A cylindrical nut with an enlarged head and a cylindrical section is positionable in the large aperture for alignment purposes. A housing with a central bore and a radial flange is adapted to be bolted to the interior surface of the plate through the small apertures with bolts and nuts coupled therebetween. The central bore is adapted to receive the cylindrical section of the nut with a bearing sleeve therebetween. A primary shaft is positionable through the nut with an external end adapted to be coupled to a half-inch drill and an internal end with an axial recess and radial set screws.

Abstract: A kit for reaming the governor bores of used motor vehicle transmissions includes several cutting tools having cutting heads of different diameter. The diameters of the cutting heads are matched to the differing diameters of the governor bores of different transmissions. Each of the cutting heads is generally flat and has two pairs of flat parallel edge faces. The edge faces of the two pairs are normal to but do not intersect one another. Cutting tips project outward from the zones between neighboring edge faces. The kit further includes a guide for the cutting tools, and the guide has a centering element as well as several pairs of holes. The holes of different pairs have differing relative positions which correspond to the differing relative positions of threaded holes in the different transmissions. This allows the guide to be connected to any of the transmissions. The kit also includes several adapters each of which is provided with first and second centering elements.

Abstract: An improved tool and method for the machining (e.g., boring, cutting, grinding and the like) of a workpiece. The tool includes a body that can be connected in a cantilevered arrangement to a machine for rotating machining operations and has fluid distribution channels formed in the body in a predetermined arrangement. The tool also includes a machining surface and at least one bearing surface formed on the peripheral surface of the tool. Pressurized fluid is provided through the fluid distribution channels in use, which, enable creation of a fluid bearing between the tool and an opening in the workpiece which has been machined by the tool. In addition, the tool can also include additional fluid distribution openings for cooling and cleaning of machining surfaces.

Abstract: Burrs formed at the ends of a bore during a honing operation performed by a single pass honing tool are removed by a deburring attachment which is carried on the leading end of the tool. The attachment includes one set of spring-loaded blades which remove burrs at one end of the bore as the tool is retracted from the bore and further includes an axially spaced set of spring-loaded blades which remove burrs at the opposite end of the bore during retraction of the tool.

Abstract: The method, apparatus and system utilize the saddle on which the stationary head of an automatic screw machine is normally mounted, for supporting a cylindrical boring bar. Rotation and advancement of the bar on the saddle surface enables reboring of the cylindrical opening through the rotary head-mounting section of the machine, which rebored opening will be precisely coaxial with the surface of the saddle.

Abstract: An improved support mechanism for supporting a boring bar at spaced locations along its length within a workpiece during a boring operation, the present support mechanism being particularly adaptable for precision in-line boring of the cam shaft bores associated with overhead cam cylinder heads such as the Ford Escort overhead cylinder head presently in use and being specifically directed to centrally supporting the boring bar intermediate the respective opposite end portions of the cylinder head or other workpiece, the present support mechanism including a first annular member slidably positionable on the boring bar at an intermediate location along its length, the annular member being constructed to enable the boring bar to rotate freely therein, a second member slidably positionable within any one of the lifter bores associated with the particular cylinder head or other workpiece to be re-bored, the second member including a locking mechanism for locking the second member within any one of the lifter bores

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 machine includes a power unit having a housing, a drive member for engaging a boring bar, and a motor for driving the drive member to rotate relative to the housing. The boring machine also includes a bearing assembly comprising an inner bearing member defining a passage through which the boring bar extends, and an outer bearing member in which the inner bearing member is fitted in a manner permitting angular movement of the inner bearing member relative to the outer bearing member about axes perpendicular to the axis of the passage defined by the inner bearing member. In use, the bearing assembly is attached to a workpiece in a manner preventing movement of the outer bearing member relative to the workpiece, and a collapsible torque transmission linkage connects the housing of the power unit to the outer bearing member, whereby the housing unit is held against rotation relative to the outer bearing member.

Abstract: A sleeve is axially aligned with the bore which is to be cut by a cutting bar rotated in the sleeve. The sleeve is placed and held in proper position by radially projecting brackets having holes in them. These holes are aligned with holes in a member having its holes in preselected positions remote from the axis of the bore. The sleeve also serves as a stop to prevent excessive forward or rearward longitudinal travel of the cutting bar by abutment with collars detachably secured at suitable positions on the bar.

Abstract: A process and apparatus for centering a pilot shaft which is inserted into a valve guide of a valve seat to be machined, and serves therein as a guide mandrel for a rotary shaping tool. By electronically controlled drive mechanisms, the pilot shaft is supported in a central position by a swiveling ball maintained in a swivelable manner between two clamping shells, and is held between two displaceable clamping plates and centered in the valve guide. To center the pilot shaft, it is moved in two crossing directions by the drive mechanisms through the horizontal displacement of the clamping shells. The clamping shells are successively moved to their two end positions of their two crossing displacement directions. The displacement path lying between these end positions is electronically measured. The drive mechanisms then move the clamping shells into the electronically determined central position of the two measured displacement ranges.

Abstract: A self-centering and aligning attachment assembly for attaching a portable align boring machine to a workpiece or associated support for machining a bore in the workpiece includes first and second attachment sub-assemblies. The a first attachment sub-assembly has a first tubular member through which the boring bar can pass and which is securable to the boring machine. The second attachment sub-assembly has a second tubular member through which the boring bar can pass, and which is securable to the workpiece or associated support with an inner bearing member in alignment with the bore in the workpiece to be machined.

Abstract: Method and apparatus for conducting boring of a series of spaced walls on a workpiece using a self-adjusting boring bar.

Abstract: An engine block reboring system for main bearings in which the block is mounted on a pair of rails extending laterally on a workbed and is rebored by a tool driven by a right-angle drive extension on a vertical boring machine after the position of the block has been adjusted so that the vertical axis of the boring machine spindle and the desired reboring axis are in the same vertical plane, and the proper height for the tool is set for reference, so that the bearings can be rebored by manipulating the spindle vertically and horizontally in said vertical plane with respect to the height reference. Apparatus is provided for initially properly aligning the block and keeping it in aligned position during the reboring operation.

Abstract: A portable cambearing line boring tool for an internal combustion engine with an aluminum head or a cast iron block with aluminum caps and an overhead camshaft with non-replaceable bearings that are cast in as an integral part of the cylinder head which utilizes a cutting bar formed with blind openings for receiving spring loaded cutters. Centering of the cutting bar is by the use of locating bushings selected to fit a plurality of different cam-oil-seal and/or oil-plug openings at either end of the cylinder head. The bushings remain in place during the line boring. Horizontal alignment is by alignment ears secured to the upper valve cover gasket surface. For long heads a center bar support is provided. Rotation of the bar is by a portable hand held drill.

Abstract: A boring apparatus and process comprising suspending a boring bar for boring a hole in a workpiece for universal pivotal movement in all directions. Then, the workpiece is brought below the boring bar with the axis of the hole being vertical. Thereafter, the boring bar is lowered and eccentrically passed through the hole in the workpiece and slidably and rotatably supported at least at two points thereof axially spaced apart. Then, the boring is effected by the rotation and axial relative movement of the boring bar with respect to the workpiece, with the axis of the boring bar aligned with the axis of the workpiece.

Abstract: A line boring machine adapted for high speed line boring of engine blocks or the like featuring a series of spaced crankcase bulkheads, employes a motorized spindle capable of advancing, and boring bar from one end of the block therethrough to the other end to penetrate a remote cutting end of the bar serially through the bulkheads.

Abstract: An improved boring bar for machining bearings in an engine block or the like includes a plurality of circumferentially spaced wear pads which extend radially beyond the surface of the bar and form the sole points of support between the bar and the inner race of a bearing in which the bar is slideably received. Preferably, at least two of the wear pads are radially displaceable within slots on oposite circumferential sides of longitudinally aligned cutting tools which are secured to the bar. The pads are removably mounted in the slots within the bar by screws to allow rapid replacement of the pads due to wear. A thin layer of resilient material, such as neoprene rubber, is captured between the radially displaceable pads and the bottom of the slot, and urge the pads away from the bar, thereby biasing the bar in a direction away from the cutting tools and toward one side of the inner race of the bearing. The constant lateral biasing of the bar eliminates tool chatter and improves machining accuracy.

Abstract: A boring machine used for a line boring bearing housings of an automotive engine block which provides for very secure mounting and precise operation by having rigidity built into the mounting table but yet is low cost, easy to fabricate, and readily adapted to a wide variety of different sizes of engine heads.

Abstract: A portable boring machine for boring bearing housings in situ includes a pair of spaced apart mounting members for adjustably positioning a boring bar within a row of bearing housings. The spaced apart mounting members are removably positionable on the boring bar and permit rotation of the boring bar with respect to the housings. The mounting members include radially adjustable jaws which enable the space between the boring bar and an adjacent bearing housing to be adjusted by the user in order to adjust the position of the boring bar within the housing and to vary the inclination of the boring bar with respect to the row of housings to be reconditioned. In this way the user has complete control between the relative positions of the boring bar and the bedplate. Moreover, since the support members are removably positionable on the boring bar they may be adjusted in position with respect to the particular housing to be bored.

Abstract: An in situ machine is provided for refurbishing a bore in a workpiece. The achine includes a shaft which is adapted to be fixed to the workpiece in axial alignment therewith. A tubular boring element is concentrically mounted for rotation about the fixed shaft and is adapted to extend into the workpiece bore. A cutting head is slidably mounted on the boring element for reciprocable movement therealong. A device is provided for rotating the boring element and cutting means, and another device, which is responsive to the rotating device, is provided for advancing the cutting head along the boring element.

Abstract: An apparatus and method is provided for an air bearing support of a rotatable tooling bar, such as a boring bar. One or two mandrels may be provided for this tooling bar to form a complete mandrel assembly with the tooling bar. An air pressure expansible collet is provided on each mandrel so that each may be clamped within a clamping aperture, such as an aperture on the workpiece itself. Air under pressure is supplied to the two mandrels simultaneously to accomplish, first, an air bearing centering of each mandrel around the tooling bar as a guide; second, an expansion of the collet on each mandrel for clamping of each mandrel within the clamping apertures; and, third, provision of an air bearing support and centering of the tooling bar within the two mandrels during machining for precise machining of the workpiece by the continued air supply.

Abstract: A tool for use in the line boring of diesel engine cylinder blocks. The tool includes a mounting pad having a pair of holes for fitting over dowel pins projecting from the end of the cylinder block. A central opening of the pad is then centered in alignment with the bores of the engine block to receive a bearing providing rotative support for a shaft. The shaft extends through the center of each bore to permit accurate cutting of damaged bore areas with a cutting tool on the shaft. The bearing can be adjusted in limited fashion by an adjustment mechanism on the pad to assure that the shaft is centered in any undamaged bores that are present. An adapter plate permits mounting of the pad on engine blocks having locating openings instead of dowel pins.

Abstract: An align boring machine for boring bearing housings of an automotive engine block wherein a boring bar is rotatably suspended by and rotatably driven between two columns positioned upon machine ways, and the engine block is mounted for aligned movement along said ways.

Abstract: An align boring machine for boring bearing housings of an automotive engine block wherein a boring bar is rotably suspended by and rotably driven between two columns positioned upon machine ways, and the engine block is mounted for aligned movement along said ways.

Abstract: An align boring machine for boring .Iadd.a plurality of generally aligned .Iaddend.bearing .[.housings.]. .Iadd.units .Iaddend.of an automotive engine .[.block.]. wherein a boring bar is rotatably suspended by and rotatably driven between two columns positioned upon machine ways, and the engine .[.block.]. .Iadd.unit having the bearing units .Iaddend.is mounted for aligned movement along said ways.