Medição e análise de planeza de superfícies metrológicas usando nível eletrônico e os métodos de Moody e malha retangular

Abstract

Surface tables are extremely important in engineering due to the fact that they serve as a primary reference in both the measurement and inspection of workpieces. Such surfaces must be properly calibrated to provide high quality level in the measurement and inspection tests. Flatness is the metrological characteristic used to evaluate the accuracy level of the surface tables. There are several norms that deals with surface tables flatness and establish tolerance limit or accuracy degrees regarding to the surface tables dimensions. This study aims to measure and analyze the surface table flatness by using electronic level along with Moody and rectangular grid methods according to the ISO 8512 standard. An electronic level was used to measure the inclining level of the surface tables, using the well-known Moody and rectangular grid methods. The Optical Analysis Software calculated all flatness deviations, showing them in isometric and numeric charts. The calculated closure errors show the high quality in the measurement data acquisition because the values showed in all tests satisfy the electronic level manufacturer’s recommendation, which means that the closure errors did not exceed 90% of the maximum peak. Therefore, the results of evaluated surface tables are validated as regards metrological quality. The results point out that the surface tables belongs to the “0” accuracy degree according to the ISO 8512 norms. This classification is extremely important in the determination and analysis of uncertainty and of traceability since surface tables are primary reference to obtain tolerance measures and analysis of engineering workpieces. Additionally, a computer system developed for determining the flatness was used to assess its capacity as a system alternative for data analysis and determination of flatness. Their results were satisfactory, with reliable values.