Pawel Pawlus is a Full Professor of Technical Sciences at the Rzeszow University of Technology; Department of Manufacturing Processes and Production Engineering in Poland. His research interests include tribology and technical metrology.Andrzej Dzierwa has a PhD in Technical Sciences and is a researcher at Rzeszow University of Technology, Department of Manufacturing Processes and Production Engineering, Poland. His research interests include tribology and technical metrology. He is a member of Polish Tribological Society; The Society of Tribologists and Lubrication Engineers (STLE) and Hong Kong Society of Mechanical Engineering (HKSME).