xiacun factory , https://www.xiacunmetal.com In length measurement, sometimes the size can be directly measured, and sometimes an indirect method is required to obtain the measurement result. As shown in the figure, the measurement of the size of the intersection of the cylindrical end face and the small angle, we improve the measurement accuracy by means of indirect measurement. (1) After the outer circle size is accurately measured, the angle α is measured using a universal tool microscope angle measuring eyepiece.