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许多精密仪器仪表零件上分布有相互位置关系的一组孔,如图1所示。手表主夹板就是集中孔组、位置精度要求高的典型零件,其上孔组的位置度测量是生产中的重要环节。目前,国内各表厂均用直角坐标系统的坐标显微镜或工具显微镜来测量其坐标位置误差,然后换算成位置度误差。测量时,通常选取两个孔作为定位基准孔,即定心孔和定向孔,这样就在测量系统中形成测量基准坐标系,使被测夹板定位。由于在实际加工中,夹板孔组中各孔包括定位孔本身的位置,不可避免地产生坐标误差,而作为定位孔的误差就会传播到各被测
Many precision instrumentation parts are arranged in a set of holes that are related to each other, as shown in FIG. 1. The watch main plate is the central hole group, the typical parts with high position accuracy requirements, the position of the hole group measurement is an important part of the production. At present, all domestic watch factories use Cartesian coordinate system coordinate microscope or tool microscope to measure the coordinate position error, and then converted into positional error. When measuring, usually select two holes as the positioning reference hole, namely the centering hole and directional hole, thus forming a measurement reference coordinate system in the measurement system, the measured splint positioning. Because in the actual processing, each hole in the plywood hole group includes the location of the positioning hole itself, inevitably produce coordinate error, and the error as a positioning hole will spread to each measured