NASA NTRS · 19830000419
Mechanical Coal-Face Fracturer
Abstract
Radial points on proposed drill bit take advantage of natural fracture planes of coal. Radial fracture points retracted during drilling and impacted by piston to fracture coal once drilling halts. Group of bits attached to array of pneumatic drivers to fracture large areas of coal face.
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Collins, E. R., Jr.. 1984-04-01. Mechanical Coal-Face Fracturer. https://ntrs.nasa.gov/citations/19830000419
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