Abstract: A pipe cutting system includes an annular pipe encircling band member with parallel edge surfaces for encircling the pipe to be cut, releasable structure for securing the band member in pipe encircling configuration, and structure for spacing the edge surfaces of the band from the outer surface of the pipe. A carriage assembly includes two pairs of opposed spaced guide members for engaging opposed edges of the band and providing stable guidance of the carriage assembly around the pipe and structure for fixedly mounting a cutting tool on the carriage assembly. The cutting tool assembly is secured to the carriage assembly for movement relative to the pipe, preferably about a pivot axis parallel to the axis of the pipe, and includes a drive motor, a manual motor control, and a cutter disc coupled to the drive motor and adapted to be driven in rotation by the drive motor in response to the manual motor control.

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: 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: Boiler tube panel removal apparatus includes elongated guide rail structure for securing to a boiler tube panel adjacent a desired cut region, and a cutting tool assembly for mounting on the guide rail structure. The cutting tool assembly includes a support carriage with spaced guide structure for engaging the guide rail structure, main pivot structure secured to the support carriage having a pivot axis extending transversely to the guide rail structure, secondary pivot structure secured to the support carriage, and plunge cut link structure mounted on the secondary pivot structure. A cutting tool that is mounted on the main pivot includes a drive motor, a manual motor control, a drive shaft and a tube cutter disc mounted on the drive shaft. Manual operation of the plunge cut link structure rotates the cutting tool about the main pivot axis in plunge cutting action through a panel of tubes adjacent the guide rail structure.

Abstract: A portable tube end cutting tool includes a tool support shaft with an alignment assembly at one end for insertion into the tube whose end surface is to be machined and a cutter head assembly mounted for rotation about the support shaft. The tool portion to be inserted into the tube space adjacent the tube end to be machined is compact and is adapted to be locked in accurate alignment by incremental rotation of the support shaft over small angular increments, and is particularly useful where the tube surfaces to be machined are located in confined or relatively inaccessible working places.