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机床夹具的定位误差计算，是一项较繁琐的工作。综合典型的定位方式建立了一组计算定位误差的数学模型，设计了相应的程序。一、建立数学模型１．一面双孔定位（见图１）假设两销均为垂直放置，销１为圆柱销，销２为菱形销（见图１），此时工件在Ｙ方向的定位基准为双孔中心的
Machine tool fixture positioning error calculation is a more cumbersome work. A set of mathematical model for calculating the positioning error is established based on the typical positioning method, and the corresponding program is designed. First, establish a mathematical model 1. Assuming that the two pins are vertically placed, the pin 1 is a cylindrical pin and the pin 2 is a diamond pin (see FIG. 1). In this case, the work piece is positioned in the center of the two holes in the Y direction