Levelling is usually carried out with verticaldrill holes.
整平爆破通常用垂直炮眼进行。
2
In this paper, the controlling system to improve ordinary verticaldrill 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。
3
Many modern oil and gas wells are drilled directionally. At first, loggers had to run their tools somehow attached to the drill pipe if the well was not vertical.