车架测量基准的建立方法

摘要

It is important to upbuild measurement norm by selecting appropriate measured practical features when measuring position of mo-torcycle frame fitting holes by three-coordinate measuring machine. It is ideal to unite measurement norm with design norm when building up coor-dinate series according to design norm, but it will result in big repeatability errors at frame measuring. To ensure the accuracy and reliability of measurement, coordinate series must be rebuilt by the six-point orientation principle.%使用三坐标测量机测量摩托车车架各安装孔位置时，选择合适的被测实际要素并建立测量基准非常重要。通常按设计基准建立坐标系，使测量基准与设计基准统一是理想的，但在车架测量中这样建立坐标系，重复性误差很大。为确保测量准确可靠，须根据六点定位原则重新建立坐标系。