Iyi mashini yabugenewe hagamijwe kwishyiriraho inzira ntoya, igoye-gufata cyangwa ingero zidasanzwe mbere yo gusya no gusya.Nyuma yo gushiraho, birashobora koroshya gusya no gusya byintangarugero, kandi biroroshye no kureba imiterere yibintu munsi ya microscope metallographic, cyangwa gupima ubukana bwibikoresho ukoresheje testinger.