Yi nazarin gazawar inda zoben riƙe da karkace ya 'fito' daga cikin ramin duk da kasancewar yana cikin iyaka.

Lokacin da zobe na karkace ya gaza ƙasa da ƙimar ƙarfinsa da aka ƙididdige shi, tushen sanadin galibi shine 'lalacewar tsagi' ko 'tashin zobe.' Idan kayan tsagi (misali, aluminum) yana da taushi, bangon tsagi yana haifar da ƙananan nauyin axial, yana haifar da raguwa (chamfer). Zoben sai 'jita-jita' (cones) kuma ya bi wannan ramp ɗin, yana faɗaɗa radially har sai ya share tsagi. Wannan yanayin gazawa ne gama gari a cikin akwatunan gear sararin samaniya mara nauyi. Bincike ya ƙunshi auna kusurwar bangon tsagi bayan gazawar. Idan kusurwar ta wuce $10^{\circ}$, tsagi shine mai laifi. Gyaran shine ko dai a taurare tsagi (misali, anodizing ko maganin zafi) ko amfani da zobe mai kauri don rarraba nauyin ɗaukar nauyi akan babban yanki mai girma.