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.

Abstract: A lathe-type machine tool for removing axially irregular material from the periphery of a cylindrical or tubular workpiece having a variable peripheral contour on either side of the material to be removed utilizes a chordwise extending set of support arms for a pair of roller guides that are caused to follow eccentricities on the periphery of a workpiece and to provide axially spaced reference points for guiding the cutter element of the tool. The cutter is mounted on a similar chordwise extending support arm that is caused to traverse an imaginary reference line intersecting the aforementioned reference points so that a radially and axially extending irregularity can be removed between the reference points with a smooth transition zone between the reference points. Since the reference points are caused to continuously move around the periphery of the workpiece, the cutter removes material from the periphery of the workpiece between the reference points completely around the periphery of the workpiece.

Abstract: An adjustable mandrel for securing a portable lathe adjacent the end of a pipe to be prepared for welding includes a lathe support plate that is adjustable about a single miter axis relative to the body of the mandrel which is arranged to engage the I.D. of a pipe. The portable lathe is connectable to the support plate by means of a mandrel engaging fixture that enables the cutting plane of the lathe to be located adjacent the pipe end. The miter axis of the mandrel is always located so that it lies in a direction that is parallel to the cutting plane of the portable lathe. The miter angle can be set within a range of positions so that the pipe end can be cut at a precise miter angle in preparation for welding to another pipe section.

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 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 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.