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Drilling Machines, Underground.
Subsection 11 6 in SME Min Engr Handbook 1973 1:11-60to11-78
This description of underground drilling methods covers percussive, rotary, and rotary-percussive techniques. Topics specifically treated are types of drills, power sources, drill rods, types of bits, circulation or flushing systems, operating and performance specifications, and unit costs.
Subsection 11.6 in SME Min. Engr. Handbook, V. 1, 1973, PP. 11-60 to 11-78
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division