Abstract: Device for making a hole in a workpiece, including a drilling tool, a supporting apparatus that is or can be assigned to the drilling tool and is configured for supporting the drilling tool on at least one supporting region, wherein the supporting apparatus includes an elongate main body that includes at least two main-body elements, at least one main-body element being mounted so as to be movable relative to at least one additional main-body element in order to change the length measurement of the main body.

Abstract: The present disclosure provides methods for forming or enlarging holes in objects. Objects may include bone tissue and methods for fixing matched medical plates to bodies. The movable trocar with toroidal interface is adjustable relative to the surface. The present disclosure also provides for products produced by the methods of the present disclosure and for apparatuses used to perform the methods of the present disclosure.

Abstract: A device (25) for drilling holes in bone and configured to determine bone screw length, the device (25) including a surgical power drill (2) comprising: a) a housing (12) and; b) a measuring device (1) releasably attached or fixed to the housing (12), wherein the measuring device (1) is configured to measure the distance (x) covered by the housing (12) in the direction of the longitudinal axis (7) and relative to a surface of an implant (26) or a bone during a drilling process, wherein the measuring device (1) comprises a processing unit (14) to record the distance (x) covered with respect to time; the processing unit (14) comprises one or more differentiators to determine at least the first and second derivatives of the distance (x) covered with respect to time; and the processing unit (14) further comprises a peak detector to analyze one or more peaks occurring in the graph of the highest derivative with respect to time, and wherein the measuring device (1) comprises a laser device or an ultrasound position

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: Use of measurement system and detection module with a burr instrument for surgical procedures. The measurement system may include sensors (e.g., displacement, acceleration, and/or force sensors) that may be utilized to detect potentially hazardous operation of the burr instrument. For example, when penetrating through the cortex of the bone the measurement system may be operated in a unicortical mode such that when the burr passes through the cortex of the bone, the instrument operating may be arrested to avoid damage to surrounding tissue. Moreover, the system may be utilized to detect a slip or sudden loss of contact of the burr instrument such that the instrument may be arrested to avoid damage to surrounding tissue. Furthermore, the burr instrument may have a predetermined ramp-up speed.

Abstract: Unicortical path detection for a measurement system for monitoring a depth of penetration of a working portion of an instrument in a bone of a patient. The unicortical detection may compare an average cortex thickness in a bicortical path to an actual measured depth of penetration. If the actual depth of penetration exceeds the average thickness, a unicortical path may be detected. Upon detection of a unicortical path, an alert may be provided and/or the instrument may be arrested upon subsequent breaching of the cortex.

Abstract: A device (25) for drilling holes in bone and configured to determine bone screw length, the device (25) including a surgical power drill (2) comprising: a) a housing (12) and; b) a measuring device (1) releasably attached or fixed to the housing (12), wherein the measuring device (1) is configured to measure the distance (x) covered by the housing (12) in the direction of the longitudinal axis (7) and relative to a surface of an implant (26) or a bone during a drilling process, wherein the measuring device (1) comprises a processing unit (14) to record the distance (x) covered with respect to time; the processing unit (14) comprises one or more differentiators to determine at least the first and second derivatives of the distance (x) covered with respect to time; and the processing unit (14) further comprises a peak detector to analyze one or more peaks occurring in the graph of the highest derivative with respect to time, and wherein the measuring device (1) comprises a laser device or an ultrasound position

Abstract: A fastener removal aid device for removing a self-locking fastener having a pin with a head and a collar, such as a Hi-Lok® fastener, that includes at least one drill opening to receive and position a drill bit and a fastener opening for receiving at least part of the fastener. The fastener opening is designed to fit over either the collar or the pin, and the drill opening then may be centered in axial alignment with the pin, and the drill bit may then drill into either a threaded shaft end or head end of the fastener. Alternatively, the drill opening may be positioned on the sides of the fastener removal aid device to laterally break the fastener, or may also be positioned off-center to drill axially into the collar when the fastener removal aid device is positioned over the collar of the fastener and break the collar.

Abstract: A head unit for a stop holder for a drilling machine for purposes of compensating for a height displacement between two adjacent components during the introduction and/or machining of a component hole. The stop holder has a front rest section for purposes of resting on the components. The rest section has an axial projection, which forms a second contact surface displaced relative to a first contact surface in the axial direction, i.e., the tool longitudinal direction. Also disclosed is a stop holder, and a method for compensating for a height displacement between two adjacent components during the introduction and/or machining of a component hole.

Abstract: A rotating cutting tool configured to rotate around an axis of rotation in a rotary direction, and a support pad for such a tool is disclosed. The support pad defines a central longitudinal axis and has a first longitudinal edge side, an opposite second longitudinal edge side, a first transversal edge side and an opposite second transversal edge side. The support pad includes a first support surface, which is convexly curved as viewed in a plane perpendicular to the central longitudinal axis and a first recess, which extends into the first support surface in a direction from the first longitudinal edge side towards the second longitudinal edge side. The first recess extends to a final position on the first support surface.

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: A guide pad with high flexibility of arrangement is provided. The guide pad in a plate-like shape is provided, including an upper surface and a lower surface which face each other, and a side surface extending between the upper surface and the lower surface, and being removably attached to a tool body of a cutting tool, in which the upper surface includes at least one guide surface that extends in a longitudinal direction of the guide pad and curves convexly, and the upper surface and the lower surface have left-right asymmetrical external shapes, respectively.

Abstract: The invention is directed to a drill system that better uses the power curve of modern machine tools. The drill system uses a two-step drill, utilizing IC inserts to perform the major hole diameter cutting, and a central drilling system. In examples, the IC inserts can be set in a drill head in a single or double effective configuration. A central drilling system cuts the remaining minor diameter portion of the hole, and is configured to see less cutting surface footage, due to its position from the rotating center of the tool. The central drilling system may include a “self-centering” geometry, such that the drill head of the tool with be guided throughout the depth of the hole. The drill system allows for a large diameter deep hole that remains straight throughout to be drilled at higher speed and lighter feed rates thus offering a more productive tool that takes advantage of the power curves and lower thrust capabilities of modern machine tools.

Abstract: An apparatus and method for removing a fitting from a pipe having a central axis. The apparatus includes a guide member which defines a guide passage and a means for supporting the guide member within at least a portion of the pipe with the longitudinal axis of the guide passage in a coaxial relationship with the central axis of the pipe. The apparatus also includes a rotary hole saw having a cylindrical wall provided with a plurality of cutting teeth on an open end thereof and a central axis of rotation. The cylindrical wall defines a cylindrical chamber. A guide rod is connected to the rotary hole saw such that the guide rod extends through the cylindrical chamber of the hole saw and beyond the open end thereof in coaxial alignment with the central axis of rotation. The guide rod is slidingly receivable in the guide passage of the guide member.

Abstract: The reaming tool (2) comprises a cutting part (8) having a peripherally arranged reaming cutter (10) which, upon rotation about a center axis (4) of the reaming tool (2), defines a cutting circle (16) of nominal diameter (D1). The reaming tool (2) further comprises at least two peripherally arranged guide elements (12A, 12B), which lie on a guide circle (18) arranged eccentrically to the center axis (4) or having a larger diameter (D2) than the cutting circle (16). As a result of this measure, high surface quality is obtained, in particular even in soft materials, since the reaming tool is clamped in the direction of the reaming cutter (10).

Abstract: A hole saw that includes a saw body including a circular cutting edge having a cutting edge diameter, and the saw body is coupled to a guide member for rotation with the guide member. A pilot is coupled to the guide member for movement relative to the guide member and the saw body, and the pilot includes an outer guide surface having a diameter that increases in a direction from a second end portion of the guide member toward a first end portion of the guide member. The pilot is coupled to the guide member such that at least a portion of the outer guide surface extends past the circular cutting edge of the saw body in a direction from the first end portion of the guide member toward the second end portion of the guide member.

Abstract: An undercut anchor system designed for effecting a drill hole and enlarging a lowermost end thereof for insertion and setting of an anchor therein, which utilizes interlocked components surrounding a rod body which can be used as a setting tool in a one-step process to position a bore hole sleeve and an anchor in position within the bore hole. An anchor is positioned on the rod body below the bore sleeve. A cutting tip protrudes from a lower end of the rod body. The cutting tip portion has an operational cutting radius greater than a radius of the rod body. In this manner, an anchor can be inserted within the pre-drilled hole, and, when the anchor has been flanged outwardly by conventional means within the hole, the flange portions of the anchor will rest within the enlarged area, thus securely retaining the anchor in place.

Abstract: The invention relates to a single-lip drill (10) having at least one cutting edge (160) for solid drilling, comprising a drill head (13) arranged on a shaft (12), a chip removal channel (151) extending substantially along the axis of the drill head (13) and of the shaft (12) and arranged in both the drill head (13) and the shaft (12), and a plurality of guiding elements (170, 171, 172, 173) arranged on the circumference of the drill head (13), wherein the single-lip drill is characterized in that at least one guiding element (170) is arranged at least partially in an angle range of greater than or equal to 245°, measured from the cutting edge (160) arranged at 0° in a direction opposite the rotational direction of the single-lip drill.

Abstract: This repair device includes a casing, a slide shaft slidably arranged with respect to the casing, a turn table rotatably arranged with respect to the slide shaft, and a cutting mechanism installed on the turn table and including cutting tools. The turn table is rotationally displaced while the slide shaft slides in an axial direction, so that the cutting tools helically turn to cut an inner periphery of a nozzle. The cutting mechanism includes a cutting-tool switching unit that switches the cutting tools.

Abstract: A system and method to remove a bushing from a bore includes an alignment tool that fits within an inner cavity of the bushing and a cutter tool aligned by the alignment tool. The method includes forming a groove on an inner surface of the bushing with the cutter tool and guiding the cutter tool with a guide associated with the alignment tool.

Abstract: This repair device includes a casing, a slide shaft slidably arranged with respect to the casing, a turn table rotatably arranged with respect to the slide shaft, a cutting mechanism installed on the turn table and including a cutting tool, and an advancing and retracting mechanism that displaces a radius of rotation of the cutting mechanism with respect to rotations of the turn table forward and backward. In a state where the casing is centered and positioned with respect to the pipe, the turn table is rotationally displaced while the slide shaft slides in an axial direction, and the advancing and retracting mechanism displaces the cutting mechanism forward and backward. Accordingly, the cutting tool helically turns along an inner peripheral shape of the pipe to cut an inner periphery of the pipe.

Abstract: A rotating tool includes a plurality of elongated members, and a support for holding the elongated members relative to an axis of rotation of the tool, wherein a guiding pad extends from at least one of the elongated members.

Abstract: The bushing replacement kit includes components for reaming out a bushing passage in a mechanical structure, and for installing a new bushing in the passage. The reamer portion of the kit includes a reamer guide, which is secured precisely and immovably to the seal sleeve of the passage, the reamer having a pilot shaft that fits precisely within the guide. The guide is held in place by a guide retaining plate, which is clamped to the mechanical structure over the guide. When the reaming operation has been completed, the ream is removed and a threaded bushing installation shaft is passed through the guide and bushing passage. A new bushing is placed at the back of the passage, with a bushing installer placed in back of the bushing. A threaded fastener is installed on the installation shaft and tightened to force the new bushing into its passage.

Abstract: A reamer has a center axis and includes a single cutting edge, provided for a cutting part that is arranged at a leading end side. The reamer includes three guide pads in the cutting part. The first guide pad is formed so as to project to the side almost opposite that where the single cutting edge is formed.

Abstract: A short-hole drill, including a drill body being rotatable about a center axis and having a rotationally symmetrical envelope surface, one or more replaceable cutting inserts mounted in pockets in a front end of the drill body, one or more outwardly open flutes being countersunk in the envelope surface and extending rearwardly from the front end of the drill body to evacuate chips from the cutting inserts, and a number of replaceable first support pads being mounted in countersunk seats proximate the front end of the drill body to support and guide the drill against a hole wall generated by the cutting inserts. A number of second support pads are mounted in countersunk seats that are axially spaced apart from the first support pads by an envelope surface portion having a predetermined axial extension to support and guide the drill when the first support pads leave the hole wall.

Abstract: A seismic tool assembly for effecting a drill hole and enlarging a lowermost end thereof whereby an anchor can be set more securely therein. A drill bit is inserted through an opening in a stabilizer, which is positioned over a surface where the drill hole is to be made. The bit is placed into the drill hole, attaining a position at the lowermost end thereof. The lower end of the bit has a cutting portion having a cutting radius greater than that of the bit body whereby, when the bit is inserted fully into a lowermost end of the hole and rotated, the cutting portion enlarges the lowermost end of the hole, whereby flanged portions of an anchor will rest within the enlarged area, retaining the anchor in place. The stabilizer has a flanged portion extending into the hole, which provides a space between the bit and the stabilizer to permit limited tilting movement of the bit during drilling to enlarge a lowermost end of the hole, and for aiding in accurately inserting the bit into position.

Abstract: There are provided an expanded hole drilling device, a component for the expanded hole drilling device, and an expanded hole drilling method, capable of expanding the diameter of a previously bored hole to a large diameter without causing decentering. The expanded hole drilling device 10 includes a drill holder 22 that is attached to a drill grasping part 18 in place of a drill 16 and grasps the drill 16, and a centering attachment 24 having a conical tip end part, which is attached to the drill holder 22. The expanded hole drilling method includes a step of arranging a bored workpiece displaceably on a table 14, a step of performing centering by inserting the tip end part of the centering attachment 24 into a bored hole, a step of fixing the centered workpiece on the table 14, and a step of drilling the workpiece to expand the hole by using the drill 16 after the centering attachment 24 has been removed.

Abstract: Support pad for a long hole drill head wherein the support pad includes a base body with a bottom surface, at least one side surface and a top surface. The top surface is arranged to function as a wear surface and is defined by a titanium-free wear-resistant coating, whereas the remaining surfaces of the support pad are defined by a titanium-containing wear-resisting coating.

Abstract: A drill clamp comprising a clamp mechanism and a hole-locating pin. The clamp mechanism has a first clamp portion and a second clamp portion. The second clamp portion includes a drill-receiving opening sized for receiving a drill bit. The hole-locating pin is operatively connected to the first clamp portion. The clamp mechanism is adapted and configured for movement of the first and second clamp portions relative to each other between clamped and unclamped positions. The hole-locating pin is farther from the drill-receiving opening when the clamp mechanism is in the unclamped position than when the clamp mechanism is in the clamped position. The hole-locating pin and the drill-receiving opening are aligned with one another when the clamp mechanism is in the clamped position.

Abstract: Support pad for a long hole drill head wherein the support pad includes a base body with a bottom surface, at least one side surface and a top surface. The top surface is arranged to function as a wear surface and is defined by a titanium-free wear-resistant coating, whereas the remaining surfaces of the support pad are defined by a titanium-containing wear-resisting coating.

Abstract: Boiler tubes are removed from a boiler vessel without damaging the vessel by severing the boiler tube near the exterior periphery of the vessel, and using a piloted rotary cutting tool fixtured with respect to the longitudinal axis of the severed boiler tube to remove all but a very thin shell of the severed tube. The rotary cutting tool is then withdrawn, and the remaining thin shell of the boiler tube is manually peeled away from the periphery of the boiler vessel opening. In a preferred implementation, the rotary cutting tool is annular, and a tapered cylindrical pilot having an outside diameter slightly smaller than the inside diameter of the expanded portion of the boiler tube is retractably mounted within the annulus of the cutting tool.

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 rotary cutter (A) adapted to open a pre-drilled hole to a larger diameter, comprises a shank (3) of industry-standard external profile adapted to fit into a chuck, arbor, etc of a drilling machine, a co-axial cutting section (5) extending from the shank (3) and a co-axial, non-cutting pilot boss (9) extending from the cutting section (5), the latter being of the required larger diameter (D) for the pre-drilled hole, and the pilot boss (9) being of smaller diameter (d) and, hence, undersize with respect to the pre-drilled hole.

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 drill for drilling crossties, particularly for use in the railroad sector, comprising a protective enclosure which is formed by a movable portion and by a fixed portion and is suitable to completely cover a chuck of the drill and a drilling bit coupled to the chuck; sliding means which allow the sliding of the movable portion with respect to the fixed portion when the movable portion is placed at an area to be drilled and at the beginning of the drilling operation; and resilient means adapted to bias the sliding of the movable portion with respect to the fixed portion and suitable to be loaded by the penetration of the drilling bit and, at the end of the drilling operation, to be released for the quick disengagement of the bit from a hole formed during the drilling operation.

Abstract: A tool for aligning a portable boring bar for reboring of a bore at a location relative to a further bore including at least first and second "H"-shaped rigid guide members that are hingedly connected to permit their outboard ends to be selectively spaced apart. Each guide member includes first and second side members adapted to be disposed on opposite surfaces of an equipment component which is to be rebored, each side member for the first guide member having an outboard end designed to be aligned with a first bore, and each of the side members of the second guide member being designed to be aligned with a further bore spaced apart from the first bore. The tool serves as an alignment tool and/or as a mount for the drive unit of a portable boring bar.

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: The present invention is a self centering drilling device and is more particularly concerned with the aspect of precise location for removal of material with various sizes of drill bits, using the same drill bit holder.

Abstract: A method for restoring worn bores in a turret or other tool punch press is disclosed. The worn turret bore is refurbished by using a special boring bar and drive mechanism to enlarge the diameter of the worn section of the bore. A cylindrical sleeve is inserted into the re-bored bore and secured therein. The internal diameter of the sleeve has been machined to correspond to the unworn internal diameter of the bore. The outside diameter of the sleeve is sized to provide a slipfit with the enlarged diameter of the bore. Axial alignment of the worn turret bore is restored according to the invention by locating the boring bar along an axial centerline of an unworn region of the bore. The unworn region of the bore is the lower portion thereof and is the same diameter and in alignment with bore as originally machined. The boring bar utilizes the unworn portion of the bore as a reference when re-boring the worn portion of the bore.

Abstract: A tool for removing burrs from around both the upper and lower openings of a drilled hole 12 in a flange F comprising a collar 2, a rod-shaped main body R slidable within said collar 2 and projectable and retractable with respect to said collar 2, an upper tip 10 on the outer wall of said collar 2, the back end of said tip 10 protruding inwardly from the inner wall of said collar 2 and engaging slidably into a key flute 7 in the main body R, a lower tip 1 on the side of the lower end of the main body R and protruding laterally thereof, coiled spring 3 interposed between the the coller 2 and a washer 5 on the lower face of an adjusting nut 6 screwed at the main body R to urge the main body R into the retracted position and to maintain both the tips 1, 10 in predeterminate pressure engagement with the drilled hole 12, and a handle 4 to rotate both the main body R and the collar 2 simultaneously, whereby to enable to remove burrs from around the upper and lower openings of the drilled hole 12.

Abstract: A hole saw guide for alignment of a hole saw used to enlarge an existing hole. The hole saw guide includes a perforated cylindrical plug fitted to an existing hole. The perforation accepts the hole saw pilot drill member permitting free rotation. The perforated cylindrical plug includes a stop which prevent passage of the plug through the existing hole. The hole saw guide may include mechanisms for diametric adjustment to lock the plug in the existing hole.

Abstract: A drilling device for producing drilled holes with an undercut has a drill bit having a drilling head, a depth stop, an enlargement provided between the the drilling head and the depth stop and acting as a swivel bearing, a suction bell rotatably mounted on the depth stop, a bearing washer, and a resilient, ring-shaped cushioning element provided on the depth stop. The cushioning element abuts against the bearing washer and is connected to the suction bell. The depth stop of the drill shank has a concavely curved end face and the bearing washer has a convexly curved sliding face which rests on the concavely curved end face of the depth stop.

Abstract: A boring tool for refinishing the bearing seat of a limited slip differential case having a side opening and having upper and lower bores which are concentric with the bearing seat. Generally frustoconical centering bushings are wedged into the upper and lower bores of the case, and the boring head is inserted into the case through the side opening. Thereafter, a boring bar is slid downwardly through the upper bushing and the boring head and is slid into the lower bushing, the boring head then being secured to the boring bar. When the boring bar is rotated, the bushings hold the boring head in concentric relation with the bearing seat.

Abstract: A scraper tool particularly useful for hand deburring internal rounded corners, holes an concave surfaces includes a scraper blade integrally formed with a front part having a scraping edge, and a back part joined to a shank at the back end fixed to the handle. The front face of the front part is of circular configuration and is cut at an oblique angle to the plane passing perpendicularly to the scraper blade to define a continuous oblong scraping edge.

Abstract: A portable system for reworking the inside diameter of heavy oil field casing, and especially casing that has irregularities on the inner surface thereof that render the casing unsuitable for use in deep wells. A cutting head assembly is rotated as it is forced into the interior of a joint of casing. The cutting head assembly includes a mandrel which turns a special cutting device having a plurality of cutters for engaging and cutting the inner wall of the pipe as the entire cutterhead is forced to travel through the pipe. Alignment members attached to the mandrel on either side of the cutting device maintain the longitudinal axis of the cutters in proper alignment to produce the desired new pipe inside diameter. After the first half of the pipe is sized or trued, the joint of casing is reversed and the other half is cut to the same new desired inside diameter. Included in the system is a special grinder for reworking pipe having only marginal imperfections.

Abstract: A cutting tool for forming undercuts in boreholes includes a cutting member pivotally and rotatably supported in a tubular drive shaft. The combination of the drive shaft and cutting tool provide a ball joint so that the cutting tool is pivotally supported relative to the drive shaft axis. The drive shaft has an guidance bore for the cutting tool. Guidance stop faces in the guidance bore transmit rotational movement to a head forming a cutting member on the cutting tool. The head forms the undercut. The head rolls over the surface to be undercut.

Abstract: A portable system for reworking the inside diameter of heavy oil field casing, and especially casing that has irregularities on the inner surface thereof that render the casing unsuitable for use in deep wells. A cutting head assembly is rotated as it is forced into the interior of a joint of casing. The cutting head assembly includes a mandrel which turns a special cutting device having a plurality of cutters of engaging and cutting the inner wall of the pipe as the entire cutterhead is forced to travel through the pipe. Alignment members attached to the mandrel on either side of the cutting device maintain the longitudinal axis of the cutters in proper alignment to produce the desired new pipe inside diameter. After the first half of the pipe is sized or trued, the joint of casing is reversed and the other half is cut to the same new desired inside diameter.