Abstract: An apparatus for mounting a cutting tool or grinding tool in substantially perpendicular orientation with a pipe is provided. The apparatus comprises a support arm with a clamp for engaging the pipe; a pivot means on the support arm; and a tool mounting arm with a tool mount means for engaging the pivot. The clamp is positioned to grip the pipe, with the pivot means extending generally parallel to the pipe; the tool mounting arm is engaged with the support arm; then the cutting or grinding tool is mounted on the tool arm. A tool so mounted may then be swivelled in a generally arcuate path towards and away from the pipe to be cut in a plane generally perpendicular to the orientation of the pipe. A method for severing a service tee with the mounting apparatus is also provided.

Abstract: A system and method of cutting a core out of a finished surface for keyhole excavation provides a truck with a turret to which a support arm supporting the cutter assembly is mounted, and a stabilizing member remote from the turret, which allows the turret to be rotated about its complete arc of motion while stabilizing the support arm at any desired position about the truck. In a first embodiment the invention comprises an upstanding support rim affixed to or integrated into the bed of the truck. In a further embodiment the invention comprises a support member affixed to the horizontal arm and supported by the truck bed. This makes the keyhole excavation procedure safer and more precise, and allows a larger-depth cutting head to be used in order to penetrate thicker finished surfaces. In the preferred embodiment the cutter head is provided with a pilot which creates a pilot hole in the core that facilitates removal, manipulation and replacement of the core, and improves the integrity of the reinstated core.