一、引言目前人们对主轴径向误差运动的研究已进入高潮,不满足于利用标准球(环) 在机床空转情况下的轴心轨迹研究,而倾向于在线或在位测量。如何从检测信号中分离工件的形状和主轴径向误差信号呢?三传感器(以下简称三点法) 测量法是其中一种有效方法。作者认为国际现行的三点法误差分离技术存在着失误之处,即此方法中的理论公式无法分离主轴本身一次谐波信号与工件安装偏心等一次谐波信号。 I. INTRODUCTION At present, the research on radial error motion of spindle has come to a climax. It is not satisfied with the use of standard ball (ring) in the case of machine tool idling, but tends to be measured online or in situ. How to separate the shape of the workpiece from the detection signal and the spindle radial error signal? Three sensors (hereinafter referred to as three-point method) is one of the effective measurement methods. The author thinks that the current international three-point error separation technique has some mistakes. That is to say, the theoretical formula in this method can not separate the first harmonic signal such as the principal harmonic signal of the principal axis and the eccentricity of the workpiece installation.