three-fluted drill

The field verification indicates that cutting life of straight stem twist drill treated with "LHH" tempering can be increased about 30% when compared with that by conventional three times tempering, and thus the energy and man-hour may be saved.

直柄麻花钻用DGG回火处理，其切削寿命比常规三次回火的约提高30%，且可以降低能耗。

Moving from Thailand to the Persian Gulf now, where Iran is running a massive military drill expected to last three days.

现在让我们离开泰国，将目光转向波斯湾。伊朗正在进行大规模的军事训练，总统将持续三天时间。

The drill takes about three hours to recharge.

钻机充一次电大约要三个小时。

Swirling water jet is a high-pressure water through the nozzle from the orientated impeller inside the drill which is a diffusive jet with the three-dimension speed moving along the spiral line and has a particular structural properties and high rock-breaking efficiency.

旋转水射流是高压水经过钻头内部的导向叶轮从喷嘴脱离后形成的具有三维速度、沿螺旋线运动的扩散性射流，其结构特性独特，破岩效率高。

This paper introduced the application of new Hall sensor in the voltage and current regulation of the speed-regulation system of rotary three-cone bit drill and analyzed the mode of operation, the structural characteristic and the use result of the component element.

文章介绍了在牙轮钻机调速系统的电压、电流调节中，采用了新型霍尔元件，并具体分析了其工作方式、构成特性以及使用效果。