Abstract: A computer-integrated survey system which is useful in the location of underground obstacles, such as rocks, concrete, steel and ice is disclosed. Specifically, the detection system of the present invention is operated by a microcomputer, having a series of sensors, which integrate position-determining systems, time, sub-surface radar, sonar, seismograph, laser equipment and earth-resistivity functions to accomplish its stated purpose. The system is specially designed in a compact fashion so that it may easily be hand-held, if so desired. Simultaneous with the detection and measurement of underground obstacles, in a preferred embodiment of the present invention, a permanent record of all information may be constructed for subsequent review and print-out.

Abstract: The tool is especially adapted for field use for spiral machining annular and solid work members of any geometric configuration, including but not limited to pipes, valves, flanges, etc., and comprises a stand carrying a hollow main shaft which rotatably supports a face plate which, in use, is positioned opposite to the work member. A tool holder is mounted for radial travel on the face plate. A motor rotates the face plate. The rotary motion of the face plate causes the tool holder to rotate and linearly travel. Preferably, the tool holder is mounted on a frame disposed for adjustable pivotal movement relative to the face plate.