Component Hole 零件孔 指板子上零件脚插装的通孔，这种脚孔的孔径平均在 40 mil 左右。现在SMT盛行之后，大孔径的插孔已逐渐减少，只剩下少数连接器的金针孔还需要插焊，其余多数 SMD 零件都已改采表面粘装了。
此种方法亦可应用于其它一些机械零件孔中心距的测量。
This method can be applied to the measuring of centre distance of holes in other machine elements.
本文通过机械优化设计理念，对零件孔加工的路线和数控程序的编制进行了优化设计。
In this thesis, the thought of optimal design of the machine, the processing route of parts and the program of the NC program are excellently designed.
大多数工厂设有搬运零件的起吊孔。
Most plants are provided with hoist Wells for handing parts.
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