Abstract: A portable lathe is disclosed which has a compact arrangement of an automatic tool feed mechanism which facilitates the use of the lathe to machine an internal surface of a workpiece. An automatic cutting bit feed is located diametrically opposite the cutting bit holder and is connected to it by one or more rigid connecting bars. The bars transmit the feeding movement from a feed slide to the cutting bit holder across the face of the rotating cutting head. A feed screw is attached to an overrunning clutch which is advanced through contact with an actuating arm during each revolution of the cutting head. A clutch nut is provided on the feed screw to release the feed slide and the cutting bit holder from the feed screw to facilitate manual manipulation of these elements. The rate of feed may be adjusted by adjusting the stroke of a cam and overrunning clutch associated with the feed screw.

Abstract: A mandrel for fixedly supporting a tubular workpiece during a machine tool cutting operation on the end area of the workpiece includes a pivotally mounted shaft that engages the workpiece and is mounted so as to be angularly adjustable relative to the central body of the mandrel. The angular adjustment of the shaft permits cutting operations to be performed on the end of the tubular workpiece in planes that are offset from a plane that is perpendicular to the centerline of the workpiece. The shaft is constrained to move solely within a single plane about a pivot center located adjacent the end of the workpiece on which a cutting operation is to be performed. The mandrel assembly is geometrically proportioned so that the pivot center of the mandrel shaft can be located in the cutting plane of a machine tool with which the mandrel is intended to cooperate.

Abstract: A portable tube end preparation tool includes a right angle drive motor (44) for rotating the cutter head (16) and a right angle cutter feed nut drive shaft (78), both motor and feed nut drive shaft capable of being positioned in the same general plane to provide a narrow and short tool profile for enabling the tool to be used in very confined areas. The drive motor and feed nut drive system are mounted in separate sub-assemblies for enabling simple repair and inspection of the tool without complete or substantial disassembly of the tool, and to permit the feed nut drive to be rotated to different radial positions.

Abstract: A precision scribing tool for scribing a circumferential line around a tubular workpiece at a precise distance from the end of the workpiece includes an annular socket with a shoulder defining the bottom of the socket for receiving the end of a tubular workpiece to be socket welded, and a scriber assembly attached to the socket. The scriber assembly includes a hardened point that can be pressed against the surface of the tubular workpiece while the annular socket is manually rotated around the tube end. The scribing device includes a spring biased plunger mechanism that assures accuracy for scribing a line around the tube at a precise distance from the longest point on the end of the tube to permit inspection of a welded joint between the tube end and a socket element to insure that the tube end is located a precise distance within the socket.

Abstract: A portable machine tool for cutting pipe ends located within a confined area includes separable motor and tool housings, a mandrel and associated support shaft for coupling the tool to the pipe workpiece, a rotable cutter head movable coaxially around and axially along the mandrel support shaft for feeding the tool towards the workpiece, and a feed actuator arrangement that presents a very slim cross-sectional profile for the tool, the feed actuator including a thumb wheel that can be manipulated when the motor housing is grasped.

Abstract: A rotary reaming and counterboring tool includes a central body (28), a proximal mounting flange (30) and a distal end (36), longitudinal lands (44) and straight flutes (40) between the lands. The lands overhang the distal end of the cutter body and are provided with forward facing (relative to the cutting direction) radial reaming cutting edges (64) at the distal ends of the lands and counterboring radial cutting edges (68) at radially stepped portions of the lands. The lands are generally trapezoidal in cross section and a central bore (56) extends through the central body for accommodating a mandrel that supports the cutting tool and its driving head during operation of the tool to perform a reaming and counterboring operation.

Abstract: A tool carrier for a portable lathe includes a tool slide (84) upon which tool holders (18) are mounted. The tool holders (18) are rigidly secured to the slide surfaces by means of clamps (20) that include male gibs (70) that engage female gibs in the tool holder and the tool carrier. The clamps (20) provide a bearing surface for guiding the tool carrier along the tool slide while also functioning to clamp the carrier relative to the slide when the clamp fasteners (80) are secured.

Abstract: A portable tube end preparation tool includes an improved drive shaft for the cutter head of the tool, the drive shaft comprising a compact, three-piece assembly including two shaft portions that are axially aligned with respect to each other along the tool axis, and a coupling sleeve that fits over and joins the shaft portions together through threaded connections at adjoining ends of the shaft portions. The shaft portions and coupling sleeve cooperate with rolling bearing assemblies to react operational load forces into the tool housing through the bearing assemblies.

Abstract: A cutting tool bit holder for a machine tool removably secures a bit having a dovetail base in cutting position on a rotary tool fixture by means of a removable clamp bar and an opposed gib surface. The clamp bar is secured by removable fasteners and the tool bit may be reversable and standardized.

Abstract: A pipe end preparation and cutoff tool includes a generally annular, fixed housing and a relatively rotatable tool carrying ring that is connected to the housing by means of orthogonal sets of roller bearings travelling in continuous bearing races that are likewise disposed in orthogonal planes. The bearing arrangement enables the ring to transmit radial and thrust loads to the housing and the structural arrangement of elements is intended to prevent gross contamination of the bearing assemblies.

Abstract: A main body, including a tube holding portion, a tube end squaring and deburring portion and a tool bit actuating portion, is provided with a side handle which can be gripped for support and concurrently rotated to advance the tool bit into engagement with the tube end. A conventional electrical drill rotates the tool bit and a cam converts handle rotation to tool bit advance.

Abstract: A mandrel arrangement for mounting a pipe machining tool for rotation relative to at least one end of a pipe bend to be machined. Locating plate means are detachably mountable on the mandrel for positioning the mandrel in the pipe bend in a predetermined location. Clamping means are provided on the mandrel for clamping the pipe means in the predetermined location. A mandrel shaft means is detachably mounted to the mandrel adjacent one or both of the ends thereof for receiving the pipe machining tool to machine the ends of the pipe bend. The locking means is cam actuated to frictionally clamp the mandrel in the pipe bend at the predetermined position and the structure of the cam operated locking means allows utilization of the pipe mandrel in comparatively small internal diameter pipe bends.

Abstract: A mandrel arrangement for mounting a pipe machining tool for rotation relative to at least one end of a pipe elbow or other bend to be machined. A mandrel frame is provided with first and second flange portions having outer surfaces located within planes which intersect to form a predetermined angle approximately equal to the angle of the pipe bend. The frame is adapted to be positioned within the pipe bend with an outer surface of the first flange portion adjacent a first end of the pipe bend and an outer surface of the second flange portion adjacent a second end of the pipe bend. A locking means connected to the mandrel frame is adjustable between a first radially retracted condition in which the frame is free to move relative to the pipe, and a second radially extended condition in which the frame exerts an outward force against the interior of the pipe to frictionally retain the frame from movement relative thereto.

Abstract: A pipe bevelling tool arrangement for providing a predetermined bevel on the end surface of a pipe. The arrangement described herein provides an orbital cam follower bevelling tool that provides a constant bevel leaving a radially extending land on the end surface of a pipe having a predetermined minimal radial extent regardless of the "out-of-round" condition of the pipe. A cam is mounted to engage the exterior surface of the pipe and a bevelling tool is rigidly coupled to the cam and the cam and bevelling tool orbit around the nominal center line of the pipe. The cam and the pipe bevelling tool are resiliently mounted on a rigid arm rotating about the nominal center line of the pipe and the pipe bevelling tool follows movement of the cam in a radial direction. The pipe bevelling tool is set in a preselected position with respect to the cam to provide the desired bevel portion and extent of the radially extending portion on the end surface of the pipe.

Abstract: A mandrel arrangement for mounting a pipe machining tool for rotation relative to at least one end of a pipe elbow or other bend to be machined. A mandrel frame is provided with first and second flange portions having outer surfaces located within planes which intersect to form a predetermined angle approximately equal to the angle of the pipe bend. The frame is adapted to be positioned within the pipe bend with an outer surface of the first flange portion adjacent a first end of the pipe bend and an outer surface of the second flange portion adjacent a second end of the pipe bend. A locking means connected to the mandrel frame is adjustable between a first radially retracted condition in which the frame is free to move relative to the pipe, and a second radially extended condition in which the frame exerts an outward force against the interior of the pipe to frictionally retain the frame from movement relative thereto.