在万能工具显微镜上可借测长牙厚来决定螺纹中径,这方法的根据是螺牙厚度跟中径螺距及牙廓半角有着函数的关系,所以如果螺距S、半角(?)为已知,则测得牙厚就可决定中径。我们先讨论牙厚与中径的数学关系(参阅图1)。Z_1和 Z_2是在垂直于工件轴方向相隔 In the omnipotent tool microscope by measuring the thickness of the teeth to determine the diameter of the thread, the basis of this method is the thickness of the thread with the pitch diameter and the profile of a half-angle has a functional relationship, so if the pitch S, half-angle (?) Is known , Then the measured thickness can determine the diameter. We first discuss the mathematical relationship between caliper and caliper (see Figure 1). Z_1 and Z_2 are separated perpendicular to the workpiece axis