Reliability analysis of checking and measuring thread ring-gaugeLIANG Ping Guangdong Institute of Metrology,Guangzhou 510405,ChinaAbstract:At present there are problems in thread ring-gauge checking and measuring, so the reliability of its checking and measuring is analyzed according to its measurement principle. And relatively new method for thread ring-gauge checking and measuring has been proposed. In the case of that the pitch is not more than 0.5 mm, the calibration gauge has been used to inspect the functional diameter and the single pitch diameter. And in the case of that the pitch is over 0.5 mm, the calibration gauge has been used to inspect the functional diameter and the double-ball method has been used to measure the single pitch diameter. This method can overcome the shortcomings of the current ways for thread ring-gauge checking and measuring, reduce the risks of wrong estimation and get more reliable measurement results.[著者文摘]