用机器钻出安装指针的中心孔及导向孔，以确保铜条在冲切工序固定位置。
The machine drills the "center holes" for the hands as well as the "pilot holes" which will guarantee the positioning of the strip during blanking operations.
给出一种计算定位误差的简便方法，笔者称之为工序基准极位简图法。
A simple and convenient method to calculate the location error is given, which is named by this author the process data extreme positions diagram method.
尽可能在多数工序中用同一个定位基准。
Uses the identical localization datum as far as possible in the most working procedures.
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