Roundness is a property of a surface of revolution where all points on the surface are equidistant from the axis. The roundness of any profile can only be specified if the same center is found for the measurement. Diameter and roundness are measured by different methods and instruments. For diameter

Roundness measurementRoundness is defined as the condition of a surface of revolution. In the case of cylinders and cones, all points of the surface intersect any plane perpendicular to a common axis.Equipment for measuring roundness 1) Diameter gauge. 2) Circumferential conferring gauge=> the shaf

According to the requirements of out of roundness measurement​, the roundness tester must have three characteristics: (1) It has a high-precision spindle to realize the centering of parts and determine the center of the theoretical circle at the same time. (2) A sensor with high sensitivity. When it revolves around the center of the spindle, it can measure the small out of roundness error of the part. (3) A device with continuous indication or recording. In order to record the actual contour of the part for analysis and evaluation.