钻孔偏心一直是孔加工中难以避免的技术难题。
It is difficult to avoid technique problem for drill eccentricity in hole machining all along.
所有深孔钻都是直出屑槽的,并且均为单切削刃。
All gun drills are straight-fluted, and each has a single cutting edge.
所有深孔钻都是直出屑槽的,并且均为单切削刃。
All gun drills are straight-fluted, and each has a single cutting edge.
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