The box taps is a special external tool cutting thread and fishing externally from dropped object such as tubing, drill pipe.

母锥是一种专门从油管、钻杆等管状落物外壁进行造扣打捞的工具。

This paper discussed the methods about cutting thread on nc Lathe. The cutting errors was analyzed. The program about cutting thread and the notices in cutting process were concluded.

本文首先介绍了螺纹数控切削的编程方法，并就其对加工误差的影响进行了分析，最后根据实际工作总结出数控车床螺纹切削编程及加工时的注意事项。

Doug Cutting has posted on the topic of thread safety a couple of times.

Doug Cutting曾几次发表线程安全性的主题。

The cutting should be so precise and smooth that even a thread of hair cannot slip through the cracks.

削木需要非常精准和平滑，甚至一根头发丝的缝隙都不能有。

As previously mentioned, the axial feed is automatically generated when cutting a thread by means of the lead screw, which drives the carriage.

如前所述，当依靠驱动大拖板的丝杆切削螺纹时轴向进给是自动产生的。