“…In addition, it is clear that the roughness reduction rate is bigger between the beginning of the process and the grit #400, after that, the roughness reduction rate is smoothed. That behavior is characterized by the changing of material removal mode, from brittle to ductile removal (Olenburg et al, 2014;S anchez et al, 2002). The Kruskal-Wallis test provided very strong evidence that there is a difference between waste incorporation percentages, but the test is not capable of revealing exactly which among them.…”