双象目镜可用来测量两对称轮廓的中心距离,也可以测量轮廓本身的尺寸。它有中心对称和轴对称两种。前者的测量对象如孔一类的中心对称轮廓,后者的测量对象如狭缝、刻线等轴对称轮廓。利用后者达一特点,即可对螺距、中径进行测量。在万工显上,应用双象目镜测量螺纹螺距,其步骤如下: 1.将螺纹夹持在顶针架上,照明光阑放 Binocular eyepieces can be used to measure the center distance between two symmetrical contours, as well as to measure the size of the contours themselves. It has a center symmetry and axisymmetric two. The former measurement objects such as the center hole symmetrical profile, the latter measurement objects such as slits, etched axisymmetric contour. Using the latter up to a feature, you can pitch, diameter measurements. In all work, the use of double eyepiece to measure the thread pitch, the steps are as follows: 1. The thread clamp in the thimble holder, lighting diaphragm