1. Point-to-point systems are suitable for hole-machining operations such as drilling, countersinking, counterboring, reaming,Boring, and tapping.
   点位系统适用于钻孔、锪孔、扩孔、铰孔、镗孔、攻丝等孔加工。
2. A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.
   设计了一种锁紧装置和一反锪孔刀杆，介绍了其结构原理。

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