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Probe Drill Guidance System. Volume 1.

Rubin LA; Hipkins DL
NTIS: PB 247 064 Available for Reference At Bureau Libraries :126 pages
Research was conducted to develop, demonstrate, and deliver a field test model of a probe drill guidance system. This system was to be applicable to a transportable drill built for the Bureau of Mines to locate and aid trapped miners through a 28-inch-diameter hole from the surface. The drill guidance system was required to be operable to a depth of 2,500 feet and to enable the probe drill to hit a 5- foot-diameter target at a depth of 1,500 feet. A unique cableless system was developed that employed the drill pipe as one conductor and the earth as the other conductor, constituting a complete electrical circuit. The field test model proved every aspect of system performance but was unreliable as an operationally ready system.
Publication Date
Document Type
CP; Final Contract Report;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
OFR 82(1)-75
Source Name
NTIS: PB 247 064 Available for Reference At Bureau Libraries
Performing Organization
Telcom, Inc.
Page last reviewed: December 3, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division