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Keywords: hole depth
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Proceedings Papers
Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-109
.... For a similar reason, single chisel bits of integral steels provide lower penetration rates than cross bits. Number of drillings rods In drifter drilling the hole depth has also an influence on the penetration rate. In each meter of rod, 0' 2–0 '4% of the shock wave energy is converted into heat as a result...
