Roundness Deviations and Diameter Measurements for Diameter Standards

Diameter standards have clear importance at both laboratory and industrial levels. The calibration of such standards acts as a challenge to be carried out in high accuracy and to fulfill all related parameters.  Diameter measurements and roundness deviations of diameter standards are basic parameters that shall be measured in precise ways. In this work, a proposed method is used to measure the diameter and roundness errors of set of diameter standards; 50 mm ring and plug gauges. A length-measuring machine and roundness roundness-measuring machine are used for diameter and roundness measurements respectively. The internal/outer diameters are measured at different thicknesses and angles inside/outside the standard. The roundness deviations are measured at the same thickness values that the diameter measurements are carried out. Four algorithms of Least Squares Reference (LS) Circle, Minimum Zone Reference (MZ) Circles, Minimum Circumscribed (MC) Circle and Maximum Inscribed (MI) Circle are used in analysis of measurements of roundness deviations. The measurement results of diameter and roundness in different types and positions are analyzed and evaluated