铣床主轴(图1)精度要求很高,为了保证几个外圆的同心度,必须在一次安装中磨成。过去采用外径千分尺停车测量,精度不稳定,效率低(每个外圆常要测量三、四次)。后来,我们根据机床的特点,采用中原量仪厂的五外圆电感自动测量装置,并进行了改进,于1977年底开始使用,效果很好:主轴外径尺寸的分散度可控制在0.002～0.003毫米以内,外圆椭圆度0.002毫米以内,且减少了测量次数,提高工效25％左右。适合于中小批量的阶梯轴外径测量。 Milling machine spindle (Figure 1) high precision, in order to ensure the concentricity of a few cylindrical, must be ground into an installation. In the past the use of OD micrometer parking measurement, the accuracy of instability, low efficiency (each cylindrical often measure three or four times). Later, according to the characteristics of the machine tool, we adopted the automatic measurement device of five external inductors of Zhongyuan Metrology Factory and improved it and started to use it at the end of 1977. The dispersion of the outer diameter of the spindle can be controlled from 0.002 to 0.003 Within millimeters, the outer ovality of 0.002 mm or less, and reduce the number of measurements to improve work efficiency of about 25%. Suitable for small and medium-sized ladder shaft diameter measurement.