Abstract
Keeping stability of operation or product quality is a required competency for quality control in manufacturing industry. For controlling the products quality, the relevant data must be measured and inspected to judge if the quality of products conforms to the specifications. Originally, the accuracy of the measured data varies from each other among different operators. Therefore, in this study the causes of measurement deviations among different operators were analyzed from ergonomics point of view. Improvements were proposed and implemented. This study started with observing and recording the operations performed by the operators in the laboratory, followed by analyzing the mental process of gage reading judgment during the inspection, and ended with identifying the factors that might affect the operation quality and suggesting the improvement of the measurement method. It was recommended that a standardized and easier feature identification technique should be helpful. The effects of the new method were verified by using the Gage Repeatability and Reproducibility as an indicator. The results showed that that the data deviations caused by operators were reduced after the new method was implemented. The new measurement method could be disseminated to other departments for improving the measurement quality.