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: Improved, draw bar assisted, rotary hole sawing apparatus that provides the versatility and methods required whereby operator ingenuity can achieve a set up to accomplish the required hole sawing or similar type machine operation in a wide variety of positions, conditions and situations. The design provides for applying rotational force from either the cutter side or opposite side of the device, and can be applied by hand power or with power tools. Provision is made, with a backing plate, to facilitate sawing very thin materials and to increase stability. The setup can be arranged so that draw bar pressure can be applied from either end of the device. Provision is made so that compensating force can readily and constantly be applied to resist the side force which tilts the tool axis relative to the work piece as a result of the secondary force introduced by the ratchet type method of rotating the cutter.

Abstract: A hole preparation apparatus for back drilling, upsizing and reaming mating precision holes. The apparatus includes three main sections--a tubular body section, a base and a drive shaft assembly.The drive shaft assembly includes an upper portion sized to be received in the chuck of a conventional pneumatic or electric drill, a lower portion sized to be received in the bore of the tubular body. An internal threaded drill receiving socket is disposed at a lower end of the lower portion of the drive shaft. A coil retractor spring is located in the central bore of the tubular body section. A removable pilot drill is received in the drill receiving socket. A pilot drill bushing is located in the bottom end of the bore of the tubular body. An opener drill is changeable with the pilot drill and is received in the drill receiving socket when the pilot drill is removed. An opener drill bushing, is changeable with the pilot drill bushing.

Abstract: A heat exchanger fin remover includes a first hollow cylindrically shaped member having a closed end and an open end. The closed end is provided with a centrally disposed portion including a centrally disposed threaded aperture adapted to be received by a rotary source of power. The first member open end is provided with an annular cutting ring portion disposed of the distal edge thereof. A second cylindrically-shaped member has a first end and second end adapted to be received within the first hollow cylindrically-shaped member open end. A threaded centrally disposed extending portion is adapted to be received by and cooperate with the first member centrally disposed threaded aperture when the second member is inserted into the first member. The second member other end extends beyond the cutting ring portion disposed on the distal edge of the first member.

Abstract: A machine tool comprises a chuck mountable in a bore of a workpiece, a drive assembly attached to the chuck, and a tool head releasably attached to the drive assembly. The tool head has a tool head body, and a drive shaft extends through the tool head body and is coupled to an input shaft of the drive body. The input shaft of the drive assembly is connected through a reduction gear and an output shaft to the tool head body for supplying power thereto.

Abstract: A device and associated method for drilling a hole in the center of a broken element that is engaged within a bore, thereby enabling the broken element to be retracted by engaging the newly drilled hole. The present invention includes a collar member that defines an open central channel between two opposite ends. The collar member includes a male region adapted to engage the bore should the broken element be broken within the bore below the surface. The collar assembly also includes a female region adapted to engage the broken element, should the broken element extend out of the bore. Regardless of whether the male region engages the bore or the female region engages the broken element, the collar member aligns the open central channel over the center of the broken element. A drill bit is then advanced through the open central channel, whereby the open central channel acts as a drill guide and prevents the drill bit from wandering away from the center of the broken element.

Abstract: A threaded hole may be formed in a lid of an underground petrol tank without emptying the tank or removing the lid, using a tool (FIG. 3) having a taper tap section (61), an intermediate tap section (62) and a final tap section (63). At the leading end of the tool, there is a reamer section (60) and supported on the free end of the tool is a centerless hole cutter (50). A resilient mounting transmits drive from the main part of the tool to the cutter (50), but allows the cutter to float. A sleeve (23) surrounds the tool, so that a column of inert gas may be caused to lie in the cutting region. A magnet (57) mounted within the cutter (50) catches and holds a released disk of the cover. Also described is a rig (FIG. 1), for operating the tool (FIG. 3), and a method (FIG. 5) of securing a collar threaded into a hole formed by the tool.

Abstract: A clamping device includes a housing, removably connected to a drill motor, which has a first end portion adapted to be received within an aperture defined in a drill plate. The first end portion of the housing also defines a number of openings in which respective ones of a plurality of ball bearings are disposed. The clamping device also includes means for forcing each ball bearing outwardly within a respective opening defined in the first end portion of the housing such that portions of the ball bearings are extended outwardly beyond the housing and are urged against the drill plate. Thus, the drill motor can be securely clamped to the drill plate. The clamping device can also include a mandrel defining an internal bore through which the cutting element extends. The mandrel typically has an exterior surface in which a plurality of recesses are defined. Each recess can be aligned with a respective opening defined in the housing and can be adapted to receive a respective ball bearing.

Abstract: A drill bit centering device with a substantial intermediate open area between a top locking collar and a bottom centering cone is provided. A drill bit of the centering device is attached in an opening in the top collar and passes through the bottom cone and is surrounded by a spring. The area between the upper and lower members allows for the simple escape of shavings and chips from a drilling operation. The spring serves as the sole connecting member between the sleeves of the collar and cone. The spring, collar, attached bit, and cone rotate as an integral assembly.

Abstract: Apparatus for cutting a smooth concentric hole in a metal workpiece. The apparatus fits in a standard industrial drill chuck and has a pilot drill and tap at one end which drills and taps a pilot hole seating a mandrel on the metal workpiece. When the mandrel is seated, a cam plate and spring arrangement automatically advances the cutting teeth and provides the proper pressure on the cuttering teeth to cut the hole. The cutting teeth have a special anti-breakthrough portion which provides controlled drilling of a smooth hole. A clutch is provided which controls the torque delivered to the apparatus and allows the cam plate to function properly. The device may be adapted easily to accommodate various hole sizes by changing its faceplate.

Abstract: A double arbor has a shaft with a slideable first arbor at one end and a fixed second arbor at the other. A first hole saw of the already-cut, incorrect diameter is mounted on the first arbor. A second hole saw which is the size of the desired diameter hole is mounted on the second arbor. The assembly is attached to a drill or other rotating driving means and the first hole saw is placed into the existing opening where it acts as a pilot bit for the second hole saw. Use of the first hole saw as a pilot can also be applied to rabbeting, bevelling, grooving or sanding the existing hole by attaching different blades in place of the second hole saw.

Abstract: A spindle with a self-centering grip, or collet, and one or more pilots that the grip may engage. The grip has radially expandable and contractible portions for engaging a pilot between them. The pilot is inherently centered in the spindle because the gripping forces are equally distributed around the pilot. Each pilot consists of two adjacent, coaxial cylindrical guide portions of different diameters. A set of such pilots can be provided where each guide portion of each pilot has a diameter that is different from that of every other guide portion of the pilots in the set. The guide portion diameters may correspond to the diameters of the valve guides of particular engines or may increase incrementally over a predetermined range. A pilot can thus be selected from the set to fit the valve guides of a particular engine.

Abstract: A diamond core drill using a sealed core bit is fastened centrally by means of a hollow shaft with a slanted cut at one end, that is used in a wedging manner to secure the tool against the work surface. This eliminates the need for an exterior frame and thus permits the use of large hole saws up to 48", held by a simple and economical tool. The tool feed towards the surface is controled via an advance control nut that screws on the filleted part of the shaft. The tool has a water feed system that entraps the water in a chamber formed by the barrel of the saw and the surface to be cut, that forces the water to seep along the sawing gap thus facilitating lubrification of the core bit. The resulting configuration is such as to allow for a single tool operator.

Abstract: A tool, for preparing broken stud bolts or the like for extraction by screw extractors and more specifically is a guide for centering a center punch and/or a drill on a the broken face of a stud, comprises a nut and a shaft assembly. The nut has a central bore therethrough having a first portion threaded to mate with the stud threads and a second portion bored to just slide over the stud threads. The shaft assembly has a cylindrical shaft having a first end and a second end and an axial bore therethrough. The shaft includes a first externally threaded portion extending from the shaft first end of threads similar to those of the broken stud and an expandable sleeve attached to the shaft second end such that threading movement of the nut toward the shaft second end axially compresses the sleeve whereby the sleeve expands radially outward. The second end of the shaft has a conical end face.

Abstract: A method for repairing boiler tube walls by cutting out and replacing a worn or damaged section thereof involves the use of a power tool having a rotary milling head specially adapted to remove membrane material from between tube ends which are exposed when the damaged section is removed. The method and apparatus of the invention allows for the rapid and precise removal of membrane material from between the exposed tube ends to facilitate subsequent bevelling and welding operations, while substantially reducing the risk of weakening or damaging the tube wall by avoiding excess removal of material therefrom.

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: The method centers a guide rod, which is inserted in a valve guide of a valve seat to be machined and which serves as a guide rod for a shaping tool. By hand, or with a mechanical, pneumatic, hydraulic or electro-mechanical device, the guide rod is centered in the valve guide by means of a pivoting ball which is mounted in a manner such that it can pivot in all directions between two clamping plates and which is held with the possibility of translation between the clamping ring and the bottom of a housing. For this purpose, the pivoting ball is displaced circularly such that the guide rod sweeps all around the valve guide. By means of the follower levers, the shape of the valve guide is determined and, by means of a precise mechanical device, the pivoting ball is placed at the center of the swept shape, where it can be fixed by means of plates and of the clamping ring.

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 drilling apparatus for producing undercut drilled holes and comprising a drill shaft including a bulge portion located between a stop ring mounted on the drill shaft and a drilling head mounted at the free end of the drill shaft, and which narrows towards opposite ends of the drill shaft.

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: Apparatus and methods for alignment and mounting in position of a drill stem provided at one end with a cutting tool for use in removing coke from a coke drum. The drill stem is provided in the vicinity of the cutting tool with a drill stem guide carried on a slidably mounted plate. A flange on the drill stem is provided to prevent movement of the plate below a particular point. In a preferred embodiment, automatic clamping means are provided to attach the plate to an end flange on the coke drum when the drill stem guide has been lowered into the coke drum a sufficient distance so that the flange on the drill stem is disengaged from direct or indirect contact with the plate and/or connecting elements of the clamping means provided on an upper surface of the plate.

Abstract: An oil field cutting tool (10) for progressively cutting away a tubular member (14) installed within a well from the upper annular end (12) of the tubular member (14). The cutting tool (10) includes a plurality of elongate blades (32) spaced about the periphery of the cylindrical body (18) of the cutting tool (10). A plurality of cutting elements (42) of a predetermined size and shape are secured in a predetermined pattern on the leading surface of the blades (32) in a plurality of closely spaced parallel rows extending transversely between the sides of the blades (32) and in a plurality of closely spaced parallel columns extending generally longitudinally between the ends of the blades (32).

Abstract: Apparatus for reboring a damaged portion in the first of first and second bores (14,15) in a counterbored workpiece (12) contemplates a first pilot (35) for extending through the second bore and engaging the first bore interiorly of the damaged portion, a cylinder (41) for supporting and axially driving the first pilot and the workpiece, a second pilot (55) for engaging the first bore exteriorly of the damaged portion, a cylinder and motor (52) for supporting and axially driving the second pilot in opposed relation to the cylinder for supporting and axially driving the first pilot, whereby the first bore is concentrically aligned, and a boring device (53) mounted on the cylinder and motor for supporting and axially driving the second pilot for reboring a portion of the first bore in the workpiece.

Abstract: A process for manufacturing a cylindrical body and a device for carrying out the process.With this process, in particular sample bodies of absorbents are obtained.The intention with this process is that the nature of the bodies taken is not falsified. A device, which allows this process to be carried out rationally, is to be specified. This is achieved by the fact that firstly a plane-parallel board (1) is cut out of the material, which board (1) is provided with a guide opening (4a). Inserted into the guide opening (4a) is a guide part (5) which guides a cutting element (9) concentrically to the said guide opening (4a), which cutting element (9) separates a sleeve-shaped body (13). This body (13) is then introduced into a measurement device.

Abstract: A tool set for gauging and repairing concentricity of a workpiece bore axial section with the pitch diameter of the internal threads in the bore includes a gauge sleeve, a gauge rod, a reamer, and a stop collar. For gauging concentricity of the internal threads with the axial section, the sleeve is first inserted within the bore and threaded into a concentric relationship with the bore internal threads, and, then, the rod is inserted through the sleeve. The rod has an inner end which can extend from the sleeve and within the bore axial section such that the rod inner end will extend through a predetermined distance if the axial section of the bore is concentric with the sleeve and thus with the pitch diameter of the internal threads within the bore.

Abstract: A device is disclosed for driving conventional hole saws and for extruding sawed material from within said saws after sawing. An internally right hand threaded shank is attached to the outer base end of a conventional hole saw. A cooperating mandrel is threaded into the shank from within the hole saw. The end of the mandrel remaining in the hole saw forms wing-like projections which spiral into the hole saw as the mandrel is threaded into the shank. A sleeve freely mounted on the shank contains pins which protrude into the saw through complimentary holes provided in the base of the conventional hole saw to obstruct the spiral motion of the mandrel projections to transfer torque from the mandrel to the saw for sawing, and the sleeve is moved away from the hole saw on the shank, withdrawing the pins from within the saw to free the mandrel to thread out through the saw to extrude sawed contents therefrom.

Abstract: A chamfering reamer for reaming the inside diameter of pipe or conduit comprises a generally cylindrical body having a truncated conical forward end to be received within the inside diameter of a pipe or conduit and a rearward end adapted to be secured in a chaser holder of a threading machine and a plurality of longitudinal flutes extending rearwardly from the forward end defining a plurality of circumferentially spaced longitudinal wings. Each wing has a conical reaming portion to ream the interior diameter at the end of the pipe or conduit and a conical trip shoulder extending from the conical reaming portion to the outer surface of each wing to activate the chaser holder to release the chamfered piece and provide clearance between the end surface of the pipe or conduit being reamed.

Abstract: A muzzle brake and tool for effectively installing the brake on the muzzle end of a rifle without the necessity of engaging the services of a gunsmith. The tool for installation includes a handle assembly, a bore pilot and an insertable threading die and cutter and cutter holder by which the owner of the rifle can effectively trim the end of the barrel and then form threads on the external surface of the barrel onto which the muzzle brake can be screw threaded. The muzzle brake is a hollow cylindrical member having an internally threaded end engaged with the externally threaded end of the muzzle of the rifle together with two flat sides and four vents extending horizontally when installed on the rifle barrel with the vents being equally spaced and equally sized and communicating the hollow interior of the muzzle brake with the atmosphere to release gases thereby reducing recoil felt when the gun is fired.

Abstract: A method for fabricating an internal combustion engine cylinder head, comprises the steps: (a) forming a cast cylinder head with a passage having implanted in the walls of such passage a valve stem guide sleeve insert and a valve seat insert, the inserts being formed of fused powder metal and each having an internal cylindrical surface prepared to near net shape no longer requiring macroscale sizing; and (b) microsizing both of the internal cylindrical surfaces by a single pass of a common rotary abrasive tool inflexible along its axis and supported for accurate alignment independent of the guide sleeve. The cylinder head may be first formed with such passage having a recess for a valve seat insert and a guide bore for a guide sleeve; preshaped inserts are then press-fit into such recess and guide bore. Near net shape means an overside tolerance of plus 0.002-0.003 inches; macroscale means measurements in increments or units greater than 0.01 inches.

Abstract: The invention relates to improvements in rotary groove-cutting tools of the type having a rotatable center shaft and two or more generally arcuate flyweight subassemblies mounted for rotational movement with the center shaft, each such subassembly when thus rotated being also mounted for pivotally-hinged door-like movement between a retracted inoperative position and an extended operative one in contact with the wall of the bore to be grooved about eccentrically-located axes paralleling the center shaft but displaced radially therefrom, such improvements relating to the design and placement of the abrasive-surfaced cutters carried by each of the flyweight subassemblies which especially adapts them for use in grooving concrete bores. More specifically, the invention encompasses such cutters which are circumferentially elongate to an angular extent in which they are adapted to bridge most voids in the bore wall without jamming.

Abstract: Apparatus is provided for re-boring the cylinder of a single cylinder engine. The apparatus comprises upper and lower alignment components accurately positionable upon the axis of the cylinder by interaction with fixed features of the engine. The alignment components retain the bar or shaft of a rotating cutting tool.

Abstract: Given is a device for cutting a thread in a cup-shaped bone, in particular in the acetabulum of a human pelvis bone, which includes a cutter holder on a drive shaft, with a radially, outwardly directed cutting blade being disposed on the cutter holder. In order to cut, in simple fashion, a correctly dimensioned threading into the bone tissue with a desired depth of cut, the device includes a cutter gauge capable of being fixed in the cup space, with the cutter gauge having a central boring and an open cutting channel running spirally about the longitudinal axis of the boring. The cutter holder is capable of being introduced centrally into the boring of the cutter gauge and is capable of being set into a forcefully guided, spiral cutting movement with introduction of the blade into the cutting channel, during the course of which the cutting blade cuts the thread precisely in the bone tissue.

Abstract: A surfacing machine mountable within a valve body includes a tubular turning bar supported by chucks engaging the valve body and having independently adjustable legs and a bearing arrangement which permits rotational and axial movement of the turning bar relative to the chucks. Hoses and control rods are routed through the tubular turning bar to a removable tool head which may be accessed when deep within the valve body. The arrangement facilitates both visual and physical access to the work site such that an operator may exchange tool heads to switch surfacing operations without changing the mounting alignment of the surfacing machine within the valve body.

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 device for cutting a precise angle into the end of a tube. The device includes a tool having a pilot member insertable into the end of the tube, a plurality of spaced apart cutting members for engaging the end of the tube, and a body rigidly joining the pilot member and cutting members to one another. A drive mechanism is attached to the body for selectively rotating the tool.

Abstract: A machine for forming a chamfer on an edge portion of a cylindrical workpiece. The machine includes a table, a chuck mounted on the table for holding the workpiece and track means mounted on the table and extending parallel to the axis of the chuck. A carriage runs on the track means. A motor is carried by the carriage. A cutter head is driven by the motor. Cutter blade means mounted on the cutter head forms a chamfer on the workpiece as the carriage and the cutter head are advanced.

Abstract: A milling tool (10) for processively cutting away a section of casing (14) installed within a well from the upper annular end (12) of the casing (14). The milling tool (10) includes a plurality of elongate blades (32) equally spaced from each other at intervals between one and three inches about the periphery of the cylindrical body (18) of the milling tool (10). The blades (32) are inclined with respect to the axis of rotation and hard carbide cutting discs (34) arranged in horizontal rows on the blades (32) form the inclined leading planar face of the blades (32), and the lowermost row of discs (34) forms a cutting edge with a negative rake engaging the upper end (12) of the casing (14) in a cutting operation.

Abstract: A reamer is provided with teeth (3) having a cutting portion (4) and a smoothing portion (5), wherein at least part of the rear surface of the latter portion is fashioned as a strip. Each tooth (3) has its front angle smoothly decreasing in the direction away from the head portion (6) of the reamer.

Abstract: A tool is provided for drilling a hole in a construction material precisely concentric to a nearly inaccessible reference aperture situated opposite the side of the construction material from which the hole must be cut. A typical application is in cutting a sprinkler head receiving hole concentric with the open end of a downwardly directed drop of a sprinkler distribution system. The tool includes an elongated rod which carries a sliding guide member constrained between a stop positioned at one end of the rod and a compression spring urging the guide member toward the stop. Intermediate the length of the rod, there is provided a hole saw retaining shoulder against which a conventional hole saw of the desired diameter cut to receive a sprinkler head may be affixed with its teeth directed toward the rod first end.

Abstract: A portable multipurpose device for refacing both the make-up shoulder and the secondary shoulder of a two-shoulder tool joint, and for milling the outside surfaces of tool joints and pipes. The device uses a fixed cutting blade and rotates the tool joint to reface the make-up shoulder. The device holds the tool joint steady and uses rotating cutting blades to reface the secondary shoulder.

Abstract: A pipe shaver having an elongated mandrel and a plurality of cutting tools is used to shave the outer surface of a predetermined length of a pipe. The mandrel is secured to a cup-shaped body having a plurality of lugs for carrying circular cutting tools. The mandrel and body are separated from each other to provide an annular space for accommodating the shaved end of the pipe. A power unit having an electric motor is used to rotate the shaver.

Abstract: A stabilizing attachment for a boring head is provided. The attachment includes a clamp for engaging a rotatable head plate of the boring head, a pair of support arms extending axially of the annular clamping ring, and a transverse plate carried by the support arms at their outer ends. The transverse plate supports a shaft on which is mounted an anti-friction bearing, the outer race of which engages an opening in the wall of a pressure vessel. A bit carried by the head plate of the boring head moves in an annular path to cut a gasket seat about the opening. A method of cutting an annular groove in a wall, utilizing a stabilizing attachment for a boring head which engages in an opening in the wall.

Abstract: A cutting tool is manually operable from above the water level in a reactor cavity pool to sever locking cups from the socket-head cap screws which hold guide tubes to the upper support plate of the upper internals of the reactor. The tool includes a support assembly adapted to be mounted on the guide tube. A motor frame is mounted on the support assembly for limited vertical movement with respect thereto and carries a hydraulic motor coupled by a vertically depending shaft to a tubular cutter for rotating same about its axis. The shaft extends through an opening in the support assembly and through a locating tube which surrounds the cutter and is receivable over the associated locking cup when the support assembly is mounted in place. A drive screw is coupled to the frame and to a shaft which extends up to the coupling tube to a manually operable crank to effect vertical movement of the frame and the cutting means coaxially with respect to the locking cup to sever its top wall from its side wall.

Abstract: Apparatus for machining a stop valve seat ring while the valve remains piped to a turbine comprises a pair of spiders with adjustable arms which fit within the valve and a shaft rotatably supported by the spiders and driven through a gear train by a motor attached to one of the spiders, the shaft having a tool support which holds and is capable of moving a single edge cutting tool axially to machine the seat ring.

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: 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: A device for automatic advance of a rotating tool towards a workpiece, which includes a rotating tool holder for holding a cutting tool for operation on the workpiece. A gear wheel bears against the rotating tool holder which forces it toward the workpiece. A holder is provided to secure the gear wheel with respect to the workpiece. A device associated with the rotating tool holder engages the gear wheel and rotates it as the tool holder rotates. Associated with the holder and the gear wheel is a mechanism for advancing the gear wheel towards the workpiece as the gear wheel rotates. A stop motion apparatus associated with the gear wheel and the rotating tool holder is included for stopping the rotational movement of the gear wheel. The stop motion apparatus consists of a non-rotatable cam which operates on the cam follower to disengage it from the gear wheel, stopping the rotating movement thereof during a segment of the rotation of the tool holder.

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: 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: An apparatus for cutting away outer portions of the housing of a lock assembly in order to "pull" the lock assembly and gain entry into a safety deposit box or into an enclosure locked with a cam or similar lock, the invention allows entry into a locked enclosure with a minimum of damage to the lock. The apparatus comprises an annular guide member which fits about a safety deposit box lock or cam lock to position an annular cutting element relative to the lock so that a portion of the lock housing can be cut away to allow subsequent opening of the safety deposit box door. The annular cutting element extends through a central opening formed in the guide member and rotates within this opening, the depth of cut being controlled by a post member disposed internally of the cutting element.