用工具显微镜的双像目镜来测量孔心距时,被测量的工件的孔心距不得超出显微镜的测量范围,同时被测孔径不得大于14毫米,否则双像重叠在视场边缘,无法进行正确瞄准。这里,推荐一种测量方法,它可以用双像目镜测出孔径大于14毫米的孔心距,方法是:在图1所示的被测工件的两孔φ14和φ20 When measuring bore center distance with the double eyepiece of the tool microscope, the hole center distance of the workpiece to be measured should not exceed the measuring range of the microscope, and the measured aperture should not exceed 14 mm, otherwise the double images overlap on the edge of the field of view and can not be correctly aim. Here, a measurement method is recommended, which can use double eyepiece aperture measured hole diameter greater than 14 mm, the method is: in the workpiece shown in Figure 1 two holes φ14 and φ20