Point-to-point systems are suitable for hole-machining operations such as drilling, countersinking, counterboring, reaming,Boring, and tapping.

点位系统适用于钻、、、铰、镗、攻丝加工。

A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.

设计了一装置和一反刀杆，介绍了其结构原理。