Abstract: A reamer including; a generally cylindrical cutter body having (a) a flute formed in an outer circumferential surface of the cutter body and extending from an axially distal end of the cutter body toward an axially proximal end of the cutter body, (b) a cutting blade portion positioned at a longitudinally distal end of a downstream one of widthwise opposite edges of the flute as viewed in a rotating direction of the reamer, and (c) a guide portion having a guide surface which is circumferentially adjacent to the flute and which circumferentially extends over at least 240° about an axis of the cutter body. The guide surface is a part of the outer circumferential surface of the cutter body.

Abstract: A cutting tool assembly for cutting holes in a work piece is disclosed. The assembly includes a cutting tool member with a cylindrical cutting member, a shank member, and a guide means providing at least one guide surface tapering from the cutting member to the shank member to assist in removing the assembly from a hole cut in the work piece. Also disclosed is a conical guide member that fastens to a cutting tool providing a guide surface for the stated purpose.

Abstract: A reamer for material-removing finishing machining of drilled surfaces in workpieces made of metal. The reamer has a blade insert and two guide bars associated with the blade insert. The first guide bar trails the blade insert, as seen in the direction of rotation of the reamer, by approximately 40.degree. and the second guide bar is arranged opposite the blade insert. The reamer has at least one additional blade insert that leads the second guide bar by approximately 40.degree..

Abstract: The invention is a revolving pilot tool. The inventor's revolving pilot has a cylindrical shank which is attached to the tool usually in the center of the bottom of the tool. This shank has a threaded opening in its center. Over the shank is placed a cylindrical bearing. Over this bearing is placed another cylindrical piece that forms the outer surface of the pilot. To hold the bearing and the cylindrical piece upon the shank a screw and o-ring is usually used. This pilot is usually attached to the bottom of the tool to align the tool to an already drilled opening. However, it could be attached above a drill to align the tool to an opening being drilled. The pilot can also align the tool during line boring.

Abstract: A short-hole drill bit and short-hole drilling method in which a drill bit has a unitary body with a substantially V-shaped flute and a support pad are provided. The unitary body has a shank portion and a working portion. The flute extends axially along the working portion, and defines a cutting edge and a passive edge at the body periphery. The support pad is located along a portion of the body periphery. The support pad is located with respect to the cutting edge based on a normal cutting force and a tangential cutting force at the cutting edge. The resultant cutting force is directed at the support pad to cause the support pad to center the short-hole drill bit during operation.

Abstract: A boring tool assembly is provided and has a cutting tool mounted on one end thereof and permits the boring of a straight hole through a member. The boring tool assembly includes a boring bar having integral guide members disposed thereon that follows behind the cutting tool and maintains contact with the machined surface just cut in order to keep the cutting tool in proper alignment. To permit the continued use of the boring bar after the outer diameter of the cutting tool has been reduced due to wear, each of the integral guide members are resiliently mounted on the boring bar. This permits the guide members to collapses inwardly to maintain a perfect fit with the pilot pore. This collapse inwardly of the guide members is important to maintain bearing contact of the guide members with the pilot bore if the hole being cut by the cutting tool reduces in size due to wear or if the cutting tool has been re-sharpened or replaced with a different cutting tool.

Abstract: For influencing the run of a deep hole drilled passage in a metallic or non-metallic material a pusher pad (6) variable in strength and position is interposed between the drill rod (2) driving the drill tool (1) or the drill tool (1) itself and the inner wall of the drilled passage so that it causes a bending of the drill rod such that the drill tool assumes a changed run. The variation in the position and/or thickness of the pusher pad (6) can be fed back to the sensing of the corresponding position of the drill tool (1) and controlled by the results of sensing.

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 drilling tool includes a drill body having axially spaced front and rear ends. The front end includes tangential pockets for carrying cutting inserts spaced by respective radial distances from a center axis of rotation of the drill body. Two chip canals are formed in the front end surface adjacent respective pockets for conducting away chips. The canals are interconnected by a chip space located rearwardly of the front surface, to form in the drill body a bridge which extends diametrically and carries a plurality of the pockets. Each insert pocket includes an axially extending abutment surface against which a rear wall of a respective insert engages. Each of the abutment surfaces and rear walls is of semi-circular shape.

Abstract: Guide element for a cutting tool having a location hole (20) in the tool shank (4) having an internal thread (16, 10), which has a threaded bolt (14) having an external thread that can be screwed into the internal thread (16, 10) and is spring mounted in the screw-in direction when screwed in, and a guide head (13) fixed to a free end of the threaded bolt (14) and operating in the manner of a sliding rail.

Abstract: A reamer for precision machining of holes includes a reamer body and a knife plate supported above the exterior of the body and extending along the exterior. The knife plate has a front lower radial height cutting region and a rear taller radial height cutting region joined by an inclined step so that the first front region does the major cutting and the second rearward region does the finer machining. The front cutting region has an entrance bevel. The inclined flank shapes of the cutting regions are disclosed. Reamer guide strips supported along the support have a similarly shaped bevel and step as the knife plate.

Abstract: A drilling tool having a cylindrical body with a central axis. A first cutting insert with a cutting edge extending from a datum plane from a position about half way between the central axis and the outer edge of the holes and extending toward the first end of the tool at a first acute angle and a second cutting insert extending from the datum plane extending generally outwardly at a second acute angle substantially less than the first acute angle so that the cutting path of the second insert intersects the cutting path of the first insert whereby four chips are cut by the cutting tool.

Abstract: The invention relates to a drilling tool (11) for bores in solid material, comprising a drill shank (26) which has a radially inner indexable insert (13) at an inner chip space (21) and a radially outer indexable insert (14) at an outer chip space (22), the working areas of which indexable inserts (13, 14) overlap, the inner chip space (21) having a cover (36) which extends at least partly along the shank longitudinal axis (20), and the inner chip space (21) merging into the outer chip space (22), so that the chip discharge is effected via a common chip space (23) in the rear area (32) of the drilling tool (11).

Abstract: A drill includes support pads for supporting and guiding the drill in the drill hole. The support pads are formed as parallelepiped-shaped cemented carbide bodies which each have two wing-shaped protrusions on their longitudinal sides. In a corresponding way, the drill head of the drill includes recesses with two bulged parts on the long sides. This gives the support pad a determined axial position and strengthens the support pad at the weakening caused by the central hole. Further, the support pad can be turned half a revolution if one of its ends becomes damaged since the end spaces do not have to function as abutment surfaces.

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: A single-blade reamer is guided in a hole by means of at least one guide fillet. The guide fillet is provided with a coating of cubical boron nitride (CBN) in the region of its guide surface facing the wall of the hole. The guide fillet thus withstands heavier loads, so that the reamer is suitable in particular for the economical machining of hardened steel alloys.

Abstract: A valve adapted for insertion in a pressurized fluid flow line for blocking and sealing the flow of fluid through the line without disconnecting the line and to maintain the pressure in the upstream end of the line. The valve includes two body portions which may be clamped on the fluid flow line to form a valve body in which is adjustably mounted an elongated tubular outer shaft, and an elongated cylindrical inner shaft that is rotatably mounted through the tubular outer shaft and carries an annular hole cutter and a tubular seal. The inner shaft is rotatable for driving the annular hole cutter through the line and the outer shaft is rotatable for advancing the inner shaft and annular hole cutter and for positioning the tubular seal in the hole cut through the line to block and seal flow through the downstream portion of the line.

Abstract: A reamer tip including a main cutting edge and a auxiliary cutting edge adjoining the first main cutting edge; and a flank provided in a region of the main and auxiliary cutting edges and including a first inclined flank region having a first back angle of about 7.degree., and a second inclined flank region directly adjoining the auxiliary cutting edge, extending from the auxiliary cutting edge to the first flank region, and having a second back angle substantially smaller than the first back angle.

Abstract: A drilling tool has a drilling crown (12) removably arranged on a shank (10) at its front face, provided with two complementary regions that are mutually separated by chip channels (20) and that have partially circumferential surfaces (48). The drilling tool also has at least two cutting plates (14, 14', 16, 16') secured to the regions of the drilling crown and spaced apart by an angle of 180.degree., as well as a centering drill (26) centrally arranged in the drilling crown in the axial direction that projects over the front face of the latter. The cutting edge (18) of the outermost cutting plate (14) in the radial direction radially projects over the circumferential surfaces (48) of the drilling crown (18), whereas the working area of the innermost cutting plate radially approaches or overlaps the working area of the centering drill (26).

Abstract: A drilling tool for drilling a curved hole. The tool includes a curved guide tube for positioning the tube in drilling position against a wall and a flexible shaft extending through the guide tube having a drill bit on the end thereof adjacent the outlet end of the tube and a shank on the opposite end engaged in a drill tool chuck. Operation of the drill tool rotates the drill bit and the tube guides and directs the bit to drill a curved or angled hole. The drill bit can be a spade bit, a spiral bit or a ball mill.

Abstract: A reamer includes a cutting tip mounted in the circumferential wall of the base body of the cutting head of the reamer, and at least one guide bead located in a groove formed in the base body and extending in the longitudinal direction of the base body. The guide bead has a contact surface containing at least regionwise a diamond material.

Abstract: This invention concerns a pull boring cutter head assembly for machining long bores such as hydraulic cylinders and includes the use of support bearing blocks projecting from the cutter head to support the latter during cutting operations. The blocks are automatically radially adjustable under suitable biasing.

Abstract: A method, machine tool and boring bar for machining bores in a series of concentric journals for a camshaft in a cylinder head or block of an engine. The boring bar has an elongate and cylindrical body with a single cutting insert at one end for machining all of the journals one at a time and a plurality of circumferentially spaced and longitudinally extending bearing pads on the body which, when the insert is machining one journal, are received in the previously machined journals to radially constrain and support the boring bar. The other end of the bar is received in a chuck or drive spindle of the machine tool which rotates and advances the boring bar through the journals to machine them. Each workpiece is located and clamped in the machine tool with its series of journals to be machined substantially concentric with the axis of rotation of the insert of the boring bar.

Abstract: A drill bit for drilling a hole in layered material where the first layer encountered by the bit is softer than the second layer and where the second layer encountered by the bit produces chips capable of abrading the first layer. The drill bit comprises a solid shaft having a cutting tip, an internal bore for conducting flushing fluid to the tip and a flute for conveying the fluid and the chips away from the tip. A collar fixed to the outer surface of the shaft prevents the chips from contacting the bore drilled in the first layer.

Abstract: A drill bit for producing drill holes with an undercut and comprising a drill bit shank, a drill bit tip mounted at an end of the drill bit shank and projecting laterally beyond the shank diameter, a rounded collar spaced from the drill bit tip and integrally formed on the drill bit shank, and a longitudinally displaceable sleeve mounted between the drill bit tip and the collar and having an internal diameter which is smaller than the diameter of the collar and the maximum width of the drill bit tip, and a method of manufacturing such a drill bit.

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

Abstract: The invention relates to a method of and apparatus for making an undercut in a drilled hole in a fixed base, such as concrete, masonry or the like. The shank of a milling cutter is supported and held eccentrically in the drill hole by means of a supporting sleeve which can be extended into the drill hole when the milling cutter is running. The supporting sleeve has an outside diameter slightly less than the diameter of the cylindrical drill hole so as to fit therein, and is formed with a receptacle groove extending longitudinally of the sleeve and opening at the periphery of the sleeve. The shank of the milling cutter is positioned in the groove, the axis of which is parallel to but radially outwardly spaced from the coaxial axes of the drill hole and sleeve. Rotation of the sleeve can be by a hand wheel interconnected to the sleeve, with the milling cutter rotating with the sleeve to form the undercut.

Abstract: A surfacing machine mountable within a bore of a workpiece includes a turning bar supported by a bearing arrangement which permits rotational and axial movement of the turning bar relative to support chucks mounted on a workpiece. The arrangement facilitates both visual and physical access to the work site such that an operator may switch surfacing operations without changing the mounting alignment of the surfacing machine within the bore.

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: The invention concerns a process for machining a joint element for steel tubes, intended in particular for the petroleum industry, containing a truncated surface (2) and at least one screw stop.

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: An ice removal auger is lowered by a winch into a generally cylindrical ice containment structure from an open upper end of the structure and is controlled remotely from the exterior of the structure, for cutting and removing a body of ice therewithin. The auger comprises a power drive assembly mounted on a carriage for relative translational and nonrotational movement with respect thereto, the carriage including selectively operable engagement means which are remotely controlled from the exterior of the ice containment structure for engaging the interior cylindrical wall surface thereof to stabilize the power drive assembly against rotation relative to the ice containment structure, the power drive assembly including a motor connected through a shaft to a cutter at the lower end of the shaft which drives same in rotation, while the assembly moves axially downwardly in translation relative to the carriage for gradual and continuous cutting and removing of the body of ice.

Abstract: The operating life of the two guide members in a single bit reamer is increased by shaping the peripheral surface of the guide members with a radius of curvature less than the radius of the bore being machined. Contact between each guide member and the bore wall takes place only along a central quest area extending in the lengthwise direction of each guide member. This allows coating of the peripheral surfaces of the guide members with a hard, wear resistant material. Further, the guide members may be fastened to the cutter head by means of a screw situated in a groove extending in the tangential direction along the peripheral surface of each guide member. This increases the lubricating and cooling effect.

Abstract: A guide member is removably, but self lockingly, mounted on a cutter head. The cutter head has a dovetailed recess which receives the guide member. One side of the recess has bores which accommodate elastic elements which protrude into the recess. Friction coupling between the guide member and the elastic elements prevents axial movement of the guide member.

Abstract: Apparatus is described for insertion into a branch pipe to cut an aperture in a liner provided within the main pipe for repairing the latter. The apparatus has a body together with a cutting device and a clamping member (e.g. an inflatable sleeve) both supported by the body. Means are provided for actuating the clamping member so that it presses against the inside of the branch pipe and jams the body in a fixed position within the branch pipe. The cutting device may be advanced relative to the body, to cut an aperture in the liner. Also described is an inflatable plug which may be used to provide a seal so that a grouting operation may be performed without grout being able to escape into the branch pipe or into the interior of the liner.

Abstract: A floating knife of a boring tool for machining the inner surfaces of cylinders, has a cutter member and a support element arranged on both sides of the floating knife. The support elements are arranged for cooperation with the respective cutter member. The support elements are arranged behind the cutter member as viewed in the feed advance direction. The support surface of the support element is spaced behind the cutter member in the floating direction of the floating knife by a spacing corresponding to the extent of the allowable yielding of the cutter member in the radial direction, whereby the cutter member is able to machine the inner surface of a cylinder even if the latter has cross-apertures in its wall because the support member limits the radial floating of the knife to a safe extent.

Abstract: A device for machining the internal wall of a cylinder has a tool head with a shank securable to a rotary and axial movable boring bar. Mounted on the periphery of the tool head are a deep hole boring bit, a paring bit and a pair of obliquely mounted smoothing rolls. There is a passage for coolant to the boring bit which decreases in size in a direction opposite to the machining direction so that the coolant is accelerated in the passage to enhance cooling and flushing of swarf. A pair of radially adjustable supporting blocks assist in supporting the tool head in the cylinder and are substantially coplanar with the boring bit. The paring bit is disposed closely behind the plane in which the blocks and the boring bit lie. Downstream of the boring bit, the coolant passage is wider and has a constant cross-section area for a limited extent. The tool head further includes a bush having a helical channel therein for passage of some of the coolant to act as a lubricant.

Abstract: A pipe reaming tool for use with a bit driver includes a hollow cylindrical member having a plurality of cutting teeth disposed along the edge of one end of the cutting member and extending outwardly therefrom. A stop member is connected to the other end for limiting the depth of the ream to a predetermined length and a rod is connected to the stop member for engagement by a bit driver for rotating the tool.

Abstract: The boring bar of a boring plate lathe is provided with a device for maintaining the concentricity of the boring bar within the workpiece. This stabilizer assembly consists of a guide mounted on a piston shaft which is resiliently mounted in a cylindrical housing. The exterior surface of the housing is threaded and is provided with an adjustment nut. The entire stabilizer assembly is fitted into a cavity in the tool head to a depth limited by engagement with the adjustment nut. The stabilizer assembly is positioned on the tool head to enable the guide to extend radially outward to engage the work surface. The resilient force which is exerted by the guide on the work surface can be set by rotation of the adjustment nut to extend or retract the housing in the tool head cavity.

Abstract: An apparatus and method for precision overboring a variable diameter existing bore through a metal shaft supported in a position that causes the shaft to sag along its longitudinal axis. A plurality of precision-formed tool pilots are selectively mounted ahead of a spade bit on a rotary boring tool to maintain the path of the bit through the shaft-workpiece within a predetermined tolerance of the path followed by an existing bore. A plurality of fluted follower bearings are positioned around the tool driving shaft to minimize its vibration as the bit proceeds through the workpiece. Liquid coolant is passed at high volume into engagement with the bit and thence through the follower bearing exhaust passageways to flush metal shavings and chips from the overbore. According to the method of the invention, tool vibration is carefully monitored as the bit is forced into the workpiece.

Abstract: A substantially cylindrical hole is drilled into a support structure, and the end of the hole remote from the point of entry of the drilling tool into the structure is enlarged in its cross-sectional area so as to provide abutment surfaces for spreading portions of a fastening element inserted into the hole subsequently to the drilling thereof. The drilling tool includes a drill shaft, and a drill bit connected to the free end of the drill shaft and having lateral cutting edges. The cutting edges may diverge in direction axially away from the drill shaft and a collar may be provided on the drill shaft which, in cooperation with the inner surface bounding the hole forms a fulcrum for a lever-type angular displacement of the drilling tool for increasing the cross-sectional area of the remote end of the hole.

Abstract: A cutting tooth is carried on the outer end portion of a shaft which is eccentrically mounted within a power-rotated boring bar and which may be selectively turned within the bar to enable the tooth to be adjusted between an inactive retracted position and an active cutting position. By sliding the shaft in one direction, serrated rings mounted on the outer end portion of the shaft and within the outer end portion of the bar may be uncoupled to permit turning of the shaft. When the shaft is slid in the opposite direction, the rings are recoupled to establish a torsionally stiff rotational drive to the tooth by way of the outer end portions of the bar and the shaft. Turning of the shaft to adjust the tooth to its cutting position also effects outward adjustment of support pads for maintaining the outer end portion of the bar in a stable radial position during the boring operation.