This paper introduces briefly the present internal and external state of drilling machining methods, drill material, new technology for making drills and some new types of deep hole making drills.

介绍了当前国内外钻削加工的方法、钻头材料、制造钻头的新工艺及一些新型的深孔加工钻头。

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The application of finite element method in torsion calculating of deep hole drill is introduced.

介绍了有限元法在深孔钻头扭转计算中的应用。

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Based on analyzing the demands of small-diameter deep-hole drill for vibration drilling, a new inner-chip removal drill was designed.

分析了小直径深孔振动钻削对钻头的要求；设计了一种新型内排屑深孔钻头；分析了该钻头的结构和刃磨特点，进行了振动钻削试验。

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So, the command was given to drill a second hole that was deep enough to push some cuttings into the tool's sample acquisition chamber.

BBC: Curiosity Mars rover takes historic drill sample