... Linear and angular measurements 线性角度测量 Drill jigs 钻夹具 Micrometer heads 测微计顶点 ...
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Of these, drill jigs are, by far, the most common.
其中，钻夹具是，到目前为止，最常见的。
A fixture holds the work during machining operations but does not contain special arrangements for guiding the cutting tool, as drill jigs do.
夹具在机加工作业时夹持工件，但它不象钻模那样包含引导切削刀具的特殊布置。
Jigs make it possible to drill, ream, and tap holes at much greater speeds and with greater accuracy than when the holes are produced by conventional hand methods.
相对于用常规的手工方法加工孔，钻模使得钻孔、铰孔和攻丝速度快很多而且精度更高成为可能。
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