The small drill bit is easy to show sign of wear and tear in mechanical manufacture.
在机械制造中，小钻头容易破损。
According to the cause of its wear and tear, some advice on the design and make of a small drill bit is presented in the paper.
文章根据小钻头破损的原因，对小钻头的设计、制造及其使用提出一些改进意见及措施。
When traditionally processing the parts with small deeper hole by the method of drill, there is certain difficulty in excluding bits and the bit is broken easily.
传统上采用钻孔方法加工小孔径深孔时，存在排屑困难、钻头易折断等缺陷。
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