WITS SPECIAL EDITION - VOLUME I . A review of rock cutting for underground mining: past, present, and future . D. Vogt. Centre for Mechanised Mining Systems, University of the Witwatersrand Johannesburg, South Africa
Drill pipe for all types of drilling. Rotary, percussion, DTH, down the hole, water well, foundation, exploration, and blast hole drilling.
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Drill Bit Grading. Examining and grading the condition of a dull rock bit when it comes out of the hole is an important field operation that is often overlooked.
1 ROTARY DRILLING BITS This chapter covers the following items ¾ Roller cone bits ¾ The three cone bits • Principle features • Design factors