Abstract: According to at least one aspect of the present disclosure, a centering device includes a body including a first part and a second part connected by a hinge, the hinge structured to enable the first part and the second part to pivot relatively each other about the hinge to form a center channel extending through the body and defining a center axis. The body further includes a clasp, structured to reversibly hold the first part adjacent the second part in an assembled state, and a plurality of members extending radially from the body where, in the assembled state, the center channel and the clasp structured to reversibly attach to a body passing through the center channel.

Abstract: A paring and cutting tool, and a therewith associated method, for the stripping and paring of pre-insulated pipe ends, in particular of the outside diameter of the medium-conveying pipe comprising a clamping unit for the reception of the pipe end, a guide unit for the feed movement of the stripping and paring unit, wherein the guide unit extends through the clamping unit, a cutting unit for separating the outer pipe and the insulating layer, a carrier and a stripping and paring unit, wherein the stripping and paring unit has a paring element, preferably a paring blade, and a stripping element, preferably a stripping contour, for the simultaneous stripping and paring of the pipe end, in particular of the medium-conveying pipe end.

Abstract: The present invention provides an apparatus for facilitating enlargement of a circular opening in a door, the apparatus comprising a spacing means adapted to insert into the circular opening and contact the wall thereof, a guide means adapted to guide a bit portion of a hole saw, wherein the spacing means and guide means are arranged such that in use the guide means is capable of guiding the bit portion of the hole saw along the central longitudinal axis of the circular opening.

Abstract: Installation systems, apparatus, and methods for use in enlarging an opening in a surface and/or installing an object in an opening in a surface. A rotary bit adaptor is adapted for mounting a guide on a rotary bit for centering the rotary bit in an existing opening for enlarging the opening on center. A support system includes a connector having a retainer and a support in ratcheting engagement with the support for supporting an object in an opening. The installation systems, apparatus, and methods are disclosed with respect to installation of balusters in stairway balustrades.

Abstract: An apparatus having a body, a pilot, a blade, a shaft, and a guide. The body may have a first end and a second end. The pilot may extend from the first end of the body and the blade may be attached to the body and positioned longitudinally on the body at the first end. The shaft may extend from the second end of the body, and the guide may be configured to receive the pilot.

Abstract: The centering adaptor is configured to receive a spade type drill bit. The body of the adaptor has three centering arms to engage in a previously drilled smaller hole so that the spade type drill bit is guided along the same centerline to re-drill the hole to a larger diameter.

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: The invention is a non contact laser inspection self centering device to inspect the counter sink portion of a counter sunk fastener hole on a surface. In detail, the self centering and seating device includes a combination laser transmitter and receiver for transmitting a laser bean across a surface and for receiving the return signal from the surface. A self centering device is attached to the combination laser transmitter and receiver for aligning the laser transmitter with the fastener hole such that the transmitted and received laser beam passes across the center of the counter sink portion of the fastener hole. A computer system is connected to the combination laser transmitter and receiver for analyzing the transmitted and returned laser signal from the surface and determining if the counter sink portion of the hole is within tolerance.

Abstract: A boring tool capable of accurately forming a bored hole by securing the rigidity of a reamer to prevent turn out of the reamer at high speeds and enabling an increase in life by suppressing the breakage thereof by cutting resistance. The boring tool (21) is inserted into a pilot hole formed in a workpiece beforehand to cut the inner wall surface of the pilot hole. The boring tool comprises a shank part rotated about an axis (O), an edge part with a cutting edge (30) at the tip of the shank part, and a chip discharging groove (27) formed in the outer peripheral part of the edge part and extending from the tip side to the rear end side. The cutting edge (30) is formed at a crossed ridge part between the wall surface (28) of the chip discharging groove (27) facing forward in the tool rotating direction (T) and the outer peripheral surface (29) of the edge part. The boring tool is characterized in that the cross-section of the chip discharging groove (27) vertical to the axis (O) is formed in a U-shape.

Abstract: A planing apparatus which has an elongated bladelike member having a thickness, a width and a length, which bladelike member is symmetrical about an imaginary central longitudinal axis, and which bladelike member comprises (i) a shoulder portion comprised of two beveled cutting areas and (ii) a body portion forming a leading edge which is convex relative to the body portion. The planing apparatus has an elongated shank member for coupling the planing apparatus to a rotational driver, which shank member is attached to and axially aligned with the shoulder portion of the bladelike member.

Abstract: A reaming tool for reaming a socket in a broken end portion of a cylindrical conduit enlarges the internal diameter of the broken end portion to provide a socket for receiving a male end portion on a repair coupling. The reaming tool is guided by the inner diameter of the conduit while reaming out the broken end portion to a socket diameter that is about midway between the original internal and outer diameters of the conduit.

Abstract: A device for centering a work piece with respect to a centerline of a tool includes a radially-stationary component rigidly secured with respect to the tool such that the radially-stationary component and the tool are concentric. A biasing mechanism is biased away from the radially-stationary component to apply substantially equally-distributed radial force at a periphery of the work piece to thereby center the work piece with respect to the tool. A method of broaching a work piece having an inner and an outer diameter includes machining the outer diameter and then applying circumferentially-distributed radial force to the inner diameter or the outer diameter to thereby center the work piece with respect to a broach tool. After the applying step, the method includes broaching the inner diameter of the work piece using the broach tool.

Abstract: A system is disclosed to use a first rotary milling head to break or cut the bond of a heat transfer fin base to a boiler tube, thereby removing the heat transfer fins from the boiler tube, and a second rotary milling head to bevel the exposed end of the boiler tube, thereby facilitating the more efficient repair of the boiler tube.

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 tapered reamer is disclosed. The reamer is used to make a tapered opening in a cylinder used in a crossing gate repair kit. A straight reamer is also disclosed.

Abstract: A line transfer system with a contour machining head. The system includes a transmission arbor, a housing, a contour machining head, a driving system, and a system controller. The transmission arbor mounts within the housing, with the transmission arbor and housing sharing a common central axis. At least one contour machining head mounts to the housing. The contour machining head includes a bit tool, a slidable carriage, a linkage, a counterweight, and a pilot. The bit tool is configured for machining the workpiece, and mounts to the slidable carriage. The linkage connects to the carriage and transfers a force from the transmission arbor to the slidable carriage resulting in an independent radial movement of the bit tool with respect to the central axis. The counterweight links to the transmission arbor to dynamically counterbalance the radial movement of the slidable carriage and bit tool. Finally, the pilot connects to the contour machining head and aligns the contour machining head with the workpiece.

Abstract: The machining head for machining valve seats comprises a driving system, a housing, a carriage feed assembly, a cutting tip mounted on the carriage, and a counterweight assembly. The driving system rotates a machining head on a spindle axis, and further provides independent vertical translation of each of a driving arbor and a spindle, both of which are independent of the rotation of the spindle. The carriage has both forward and backward feed capability for moving the cutting tip radially inward or outward as it cuts. Vertical movement of the arbor is converted into force for moving the carriage by a cantilever pivoting around a fixed point. The counterweight assembly, linked to the arbor by a second cantilever, counterbalances the shift in weight caused by the movement of the carriage in order to maintain dynamic balancing as the machining head rotates.

Abstract: A hole-finishing hole finishing tool includes a pilot cone within which a quarter round section is free to be displaced in an axial direction. The quarter round section is resiliently biased away from a workpiece. When the tip of the pilot cone is inserted into a hole in a workpiece and force is applied, the quarter round section having a cutting element at its tip is displaced forward into contact with the perimeter of the hole, whereby chamfering is performed. The use of a single lip quarter-round cutting edge permits the tool to be used on small holes.

Abstract: A countersink cage for controlling a rotating countersink cutter to penetrate to a predetermined depth through a curved surface along a cutting axis. More specifically, the countersink cage comprises a top cage member with a top aperture which is formed for receiving the rotating countersink cutter axially therethrough. Rotatably attached to the top cage member is a bottom cage member. The bottom cage member has a bottom aperture aligning itself with the top aperture for receiving the rotating countersink cutter axially therethrough. Further, two contact members extend from the bottom cage member. The two contact members are sized and configured to contact the curved surface when the countersink cutter penetrates therethrough along the cutting axis to the predetermined depth.

Abstract: A pipe end chamfering tool for creating a bevel on the inside diameter or the outside diameter, or the inside and the outside diameter of a pipe end. The tool includes a body, one or more first projections, and at least one chamfering region at the juncture of the body and each first projection. The chamfering region is configured to cut either an inside bevel, or an outside bevel, or both an inside and an outside bevel on a pipe end. The first projection has a proximal, a middle and a terminal segment. The middle segment has a width essentially equal to the inside diameter of the pipe to be chamfered and stabilizes the pipe during chamfering. The terminal segment is semicircular and is oriented perpendicular to the plane of the proximal and middle segments. The terminal segment collects and allows removal of chips or shavings created on the inside of the pipe during chamfering.

Abstract: The cutting tool for machining valve seats comprises a driving system, a spindle assembly, and a system controller. The driving system provides rotational movement and vertical movement for the spindle assembly which is controlled by the system controller. The spindle assembly further comprises a spherical sheath providing capability to align a spindle to any valve seat orientation, the spindle for rotating a universal cutting blade, a machining head attachable to the spindle, a tool holder carriage for holding the universal cutting blade, and a pinion feed driving assembly or set of connecting rods for controlling the cutting radius of the universal cutting blade. The pinion feed driving assembly is driven by a servo motor which moves the spindle vertically and independent from the vertical movement of the spindle assembly and the rotational movement of the spindle. The system controller includes memory and programming for controlling the operation of the universal cutting blade.

Abstract: The present invention provides for a readily exchangeable flex tool for machining a workpiece. The flex tool includes a driver and an tool carrying body. The driver is coupled to the tool carrying body in a manner which allows the tool carrying body to have at least two degrees of freedom with respect to the driver. The tool carrying body includes an elongate pilot shaft, the elongate pilot shaft and tool carrying body having a longitudinal axis. The at least two rotational degrees of freedom allowing the longitudinal axis of the tool carrying body and elongate pilot shaft to be aligned with a longitudinal axis of a reference bore contained in the workpiece and slidably inserted therein.

Abstract: A kit for repairing a worn out of round aperture. The kit includes a template which is later utilized as a part of the repair. In a first embodiment, the template is precisely located by means of utilizing the bottom of the aperture which does not become out of round as does the upper portion thereof and is fixedly attached to the structure containing the out of round aperture. A sacrificial pin is inserted in the out of round aperture, centered therein by means of the bottom non-out of round portion and adhered thereto. A drill is then passed through the boring guide enlarging the out of round aperture to a true round bore and the sacrificial pin is drilled out at the same time. The boring guide is then removed and an enlarged precision pin is inserted into the re-bored aperture. The new pin is fixedly secured in the new aperture by any convenient means such as peening between the pin outer surface and the adjacent structure.

Abstract: The cutting tool for machining valve seats comprises a driving system, a machining head, a pilot, a depth gauge, and a system controller. The driving system provides rotational movement and vertical movement for the machining head which is controlled by the system controller. The machining head further comprises a pinion feed driving assembly and a universal cutting blade. The pinion feed driving assembly causes the cutting radius of the cutting tool to decrease as the machining head rotates. The pilot is attached to the bottom of the machining head to provide a means for centering the cutting tool. The depth gauge is disposed on the driving system and is electrically connected to the system controller. The depth gauge measures the distance between a valve seat and the cutting blade. The system controller includes memory and programming for controlling the operation of the cutting tool. An operator can input the parameters that define the geometry of the valve seat profile.

Abstract: A tool for enlarging the size of an existing bore to a selected enlarged size. The tool has a drill sized to define the enlarged bore, and a guide having a cylindrical body sized so that the guide can be rotated in the existing bore. The guide and drill including cooperating structures for releasably interconnecting the guide and the drill with the guide and drill coaxially aligned whereby, with the guide releasable secured to the drill, the guide can be located within the original hole to guide the cutting action of the drill as it enlarges the original hole.

Abstract: This invention is a portable pneumatic cutter tool for cutting countersinks into a workpiece 17 having pre-drilled holes 15. When pressure is applied, a piston return cylinder 57 and a feed rate cylinder 79 are also pressurized, which sets a body piston 72 and spindle piston 80 reacts against a spindle bar 82 which holds nose 94 in its outer-most limit position. A pistol grip drill 44 drives a geared belt 34 to cut the countersink after actuation by trigger 45. A flare tube shaft 14 expands a multiple finger and pad arrangement of a collet 12 to provide clamp-up on the back side of workpiece 17. Clamp-up on the front side of workpiece 17 is provided by pneumnatic pressure and solid mechanical stops 16. The countersink cutter 18 advances into workpiece 17, reaching its depth, and returns automatically to its start position.

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: This invention is a countersink, counterbore or spotface, external pilot guide 98 which aligns a countersink cutter's edges 170, 171 and 172 into the center of a pre-drilled hole 15. The pilot guide indexes and attaches by lock down screw 165 to the countersink cutter 18 external body hole 160, three pilot legs 100 are recessed into the countersink cutter 18's flute pockets 150 and allows the cutting edges 170, 171 and 172 to extend through the pilot countersink cut-outs 140. Button nose 110 outside diameter comes in a range of sizes dependent on the pre-drilled hole 15 size (example: Pre-drilled hole size 0.375", button nose size 0.372") this allows clearance for friction expansion. All button nose 110 outside diameter's fit the same countersink cutter 18 and all have a hole in the center which allows the flare tube shaft 14 to move freely during the countersinking operation.

Abstract: This invention discloses an improved cutting tool such as a counterbore cutter or piloted reamer that is comprised of a free-spinning pilot connected to the cutting tool. The free-spinning pilot allows the cutting tool to rotate within it while it makes firm contact with a pre-drilled hole in material to be cut improving the location of the cutter relative to the hole.

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 and apparatus 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 and optionally to simultaneously bevel the end of a tube as membrane material is being 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 beveling and welding operations or for concurrent beveling and membrane removal, while substantially reducing the risk of weakening or damaging the tube wall by avoiding excess removal of material therefrom.

Abstract: An end finishing tool includes a mandrel with a plurality of ribs at its distal end; an actuator longitudinally moveable in a first direction relative to the mandrel for moving the ribs radially outwardly in the installation mode to grip the inner surface of a conduit to be finished and in a second opposite direction for enabling the ribs to move radially inwardly in the extraction mode; an actuator driver threadably engaged with the actuator for driving the actuator in the first and second directions and a clamp release device for arresting movement of the actuator driver in the extraction mode for compelling the actuator to move in the second direction for enabling the ribs to move radially inwardly and release the inner surface of the conduit.

Abstract: A bit usable in combination with a rotatory driver, such as a drill, for extracting a remnant of a cut-off pipe from a pipe socket. The bit comprises a forward portion which is a pilot to keep the bit centered in the remnant and thereby centered in the pipe socket, a forward-facing ring cutter whose inner and outer diameters generally match the inner and outer diameters of the pipe remnant being extracted, said ring cutter being operable to cut and/or scrape the remnant edgewise from the socket, and a forward facing ring scraper operable to stop the bit from excessive penetration into the pipe socket and operable to scrape bonding material remnants from the end face of the pipe coupling.

Abstract: A rotatable cutting tool for cutting a spherical seat carries a plurality of indexable cutting inserts at the front end of the cutter body. The inserts are located in pockets and retained in the pockets by respective retainer members mounted on the body and overlying the exposed face of the insert. A reduced diameter section at the rearward end of the cutter body is dimensional to be rotatably received in a bore extending through a plate-like hanger. A retainer plate is cooperable with headed cap screws projecting from the rear end of the reduced diameter section of the body to constitute a quick disconnect coupling for rapid mounting and dismounting of the cutter upon its hanger. The cutting edges of the inserts lie in respective axial planes offset forwardly, with respect to the direction of rotation of the tool, from the axis of rotation and angularly offset from each other by unequal angles.

Abstract: A bearing may consist of one or more components where relative motion can take place between the bearing surface and a mating surface and where the mating surface may be a component of the bearing. Many bearings are circular and may be installed and secured in a housing by swaging an annular outer lip into an annular chamfer of the housing. A tool is provided for facilitating the removal of the bearing. The tool employs one or more cutter teeth which engage the swaged lip of the bearing. Axial force applied to the cutter while it is rotated effectively cuts away the annular lip thereby allowing the bearing to be pressed out of the housing. The cutter may be used in conjunction with other tool components which include (a) a bolt which extends through the center of the circular bearing, (b) centering rings which correctly orient the bolt relative to the annular lip of the bearing, (c) a nut and (d) Belleville washers which are disposed between the nut and the cutter.

Abstract: An apparatus (10,100) for counterboring a pipe is attached to a pipe end surfacing machine (12) and is comprised of a frame (14) pivotally mounted to a flywheel (16). A cutting tool (50) and guide wheel (72) are attached to said frame (14). Means (91) for positioning the frame so as to locate the guide wheel (72) and cutting tool (50) relative to the pipe for machining is connected between said flywheel and said frame. In operation, the apparatus (10,100) is inserted into said pipe and the cutting tool (50) is positioned to contact the inner surface of the pipe adjacent the end of said pipe. The flywheel is activated and rotates, thereby rotating the cutting tool (50).

Abstract: A counterbore for enlarging an existing hole in the presence of a wire having an end extending through the hole. The counterbore includes a twist drill bit of a size of the enlarged hole to be drilled, a shank at the rear end of the bit for engagement with a drill chuck, and a pilot shank extending from the cutting end of said bit. A swivel is mounted at the leading end of the pilot for engagement with the wire during counterbore drilling. The swivel and pilot guides the wire into the hole without twisting during drilling of the counterbore and extracts the wire from the counterbore as the twist drill bit and pilot shank is withdrawn.

Abstract: Counterbore milling cutter employing Trigon inserts mounted with the active cutting edge extending radially to provide right angle counterbore corners with 84.degree. included angle cutting points for greater strength and support than possible with conventional triangular inserts. A pair of pocket shoulders at the end of the body adjacent a pilot extension locate each insert held by a central screw offset toward the pocket shoulders, preferably configured to best resist torque imposed by axial force against the cutting edge.

Abstract: A plastic closet flange reboring tool having an elongated arbor, a cutting member and two exchangeable non-circular guide members. The arbor having a first end structured of a D-shaped threaded extension, and a second end structured for releasable connection to a rotatable tool chuck. The cutting member is generally concavo-convex in structure with the guide member being generally rectangular and flat with rounded terminal ends. Both the cutting member and guide member have central D-shaped apertures sized for receiving the D-shaped threaded extension of the arbor. Both the cutting member and guide member are releasably adjustably retained on the D-shaped threaded extension of the arbor with threaded nuts.

Abstract: A self-centering plastic pipe router tool is described for routing of a sawed-off end of pipe from the interior surface of a salvageable pipe. The router tool is a disk with an axial shank on one side of the disk. A pair of cutting flanges extend radially outwardly and upwardly in the direction of the axial shank from the disk perimeter to form first and second cutting edges. A concentric cylindrical skirt extends downwardly from the disk for axial centering of the router tool within the waste pipe ID. The first cutting edges are sized for routing of the waste pipe and the second cutting edges are sized to plane and re-finish the interior surface of the salvageable pipe for re-use.

Abstract: An improved plastic pipe reboring tool having an elongated shank, a generally concavo-convex cutting head, and changeable guide discs effective for cleaning residue glue and plastic from used plastic pipe and fittings so they can be used over again. The reboring tool is operational with both powered and manual chuck rotating devices and can be effectively used on different sizes of plastic pipe.

Abstract: A milling and countersinking fixture for machining cylindrical openings includes a spindle head having a central opening formed therein and a tool holder disposed on the spindle head having an end surface and having a central opening formed therein defining an inner surface. A clamping mandrel is supported in the central opening formed in the spindle head and guided through the central opening formed in the tool holder. The tool holder has at least one recess formed therein having a given cross-sectional shape and is open only toward the end surface and toward the inner surface. At least one cutting body has a cross-sectional shape adapted to the given cross-sectional shape for insertion in the at least one recess.

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

Abstract: Method for the non-destructive removal of tubes or of portions of tubes from heat exchangers, comprising:(a) the lengthwise cutting along at least one generatrix of one tube or of a plurality of tubes of said exchanger, to a depth at least equal to the thickness of the tube plate and to a width of up to 2% of the outer perimeter of the tubes;(b) the approaching to each other of the edges of the so-obtained cut section up to the complete release of the tube, or of the tubes, from the tube plate;(c) the possible crossways cutting of the tube, or of the tubes, to a height at least equal to double the thickness of the tube plate; and(d) the recovery of the tube, or of the tubes, by sliding same out of the said plate.

Abstract: Boiler tube repair apparatus includes elongated guide rail structure for securing to a boiler tube panel adjacent a desired cut region, and three tool assemblies for mounting on the guide rail structure. Each tool assembly includes carriage structure with guide structure for engaging the guide rail structure and support structure on which a tube machining tool is mounted and that defines a tool movement axis dedicated to and coordinated with that tool. Each machining tool includes a drive motor, a manual motor control, a drive shaft and a machining member such as a cutter disc or head.

Abstract: A portable milling tool for milling pipes, tubes, cylinders, and the like has an expandable sleeve at one end thereof for securing and centering the tool to a workpiece. An adjustable in-line rod connects the sleeve to the tool and permits the sleeve to release or secure the workpiece. An in-line shaft moves the tool into or out of engagement with the workpiece. The tool also is of compact design allowing it to be used in on-site situations wherein tool size is a problem as in milling boiler tubes.

Abstract: Disclosed is apparatus and method for a system useful in establishing a metal to metal seal between conduit joints in wells. A milling tool having means controlling down force on and positioning the cutter is used to cut and/or finish a seat on a shoulder in a well conduit, which will mate and seal with metal seal surfaces on seal units lowered on conduits into the well. One seal unit has elastomeric seals in addition to the metal seals.

Abstract: This planing device is operable for progressively planing or cutting the end of a plastic pipe to the desired length, or for reaming out a piece of plastic pipe fixed in a plastic pipe fitting in such a manner that the plastic pipe fitting can be reused. The pipe planing device is portable and is rotated by an electric drill or the like and includes a cylindrical pilot removably supported on radially spaced-apart spider-like cutter arms having cutter blades attached to their outer ends and extending outwardly beyond the cylindrical pilot a distance which is equal to the thickness of the plastic pipe to be cut or reamed. The outer circumference of the cylindrical pilot is dimensioned to provide a snug rotatable fit within the end of the plastic pipe to be planed and operates to center the planing device along the longitudinal axis of the plastic pipe.

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: The invention relates to a drill jig assembly for use in the removing a tube from a wall structure. the device fits within the tube and defines drill guide grooves along its length such that, a rotating drill inserted into the guide grooves will cut away a portion of the wall thickness of the tube. When portions of the tubing wall thickness have been reduced, the tube may be readily inwardly collapsed so as to easily remove it from the wall structure.