In this paper, the controlling system to improve ordinary vertical drill to automatic drilling machine based on PLC is introduced, and the automatic drill is suitable for batch production.

本文给出了用可编程控制器(PLC)将普通立式钻床改造成可批量加工的专用自动钻床的控制方法。

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For bedrock drilling ordinary hard alloy driller can be adopted for vertical core-drilling with the addition of clear water during rotation. for overburden dry drilling process can be adopted.

基岩钻探方法以采取普通硬质合金清水回转垂直取心钻进，覆盖层采用干钻。

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This paper analyses the ordinary technical problems in drilling perfusion stake and puts forward practical precautions and measures.

分析了钻孔灌注桩施工中常见技术问题，提出了切实可行的预防处理措施。

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He said vibrations caused by drilling for ordinary fillings could damage the nerve and cause root canal work later in life.

BBC: 'No need for dentist's drill'