Proficiency Testing for Surface Roughness Standardudand Groove Depth Standard

摘要

Surface finish of products indicates the quality of machining process in manufacturing industry.Surface texture measurements provide index of quality of manufacturing stability. National Physical Laboratory, New Delhi, India (NPLI) maintains reference surface roughness standards and measuring equipment and established traceability in surface roughness measurement rendering the surface roughness calibration services. National accreditation board for testing, calibration laboratories (NABL)conducted proficiency testing (PT) program among NABL accredited laboratories for the measurement of surface roughness standard and groove depth. NPLI has coordinated the PT Program and acting as reference laboratory among ten accredited laboratories. A technical protocol is designed in line with internationally adopted method. In this paper, the results are analyzed statistically by arithmetic mean methods. The performance of the laboratories is described using the calculated normalized error (En)value as an index.