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HOW TO SUCCESSFULLY DRILL RAISE PILOT HOLES AND MINIMIZE DEVIATION - 1.
被引：0
作者：
Worden, Euclid P.
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来源：
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1978年
/
31卷
/
08期
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摘要：
This installment outlines the key factors to be considered in optimizing pilot hole drilling programs, analyzes the causes of deviation from straight hole drilling, and deals with the first two of five factors which affect straightness of a pilot-hole - bit selection, and bit weight and rotary speed.
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页码：42 / 45
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