不少兵器在设计和生产定型时都需要进行成套的尺寸链计算，以便对零件的可装配性进行检验，保证系统的精度要求。

Many arms demand dimensional chain calculation in process of design and finalize the design in order to test the assembly characters of the parts and assure the system precision requirement.

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成套丝锥由一支或者更多在用精加工丝锥最终加工到尺寸之前移除大多数材料的较小尺寸的粗切丝锥组成。

Serial taps comprise of one or more undersized roughing taps which remove most ot the material before final sizing with a finishing tap.

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