;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
、锪、扩、铰、
、攻丝等加工。
钻)扩[锪，
，
梯]；沉，埋头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、锪、扩、铰、、攻丝等加工。
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
，
绍了其结构原理。
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