Blaster's Training Modules - Module 4 - Blasthole Drilling
2008-5-22u2002·u2002Rotary drills cut the rock by a rotating bit. The overall performance of rotary drills is most effective when bit load, bit rotation, bit selection, and operator performance all are optimized. Rotary drills work best in holes sized from 6 to 22 inches in diameter. Optimal hole depths range from 15 to 150 feet (typical) and average from 30 to 60 ...
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