Answer
Dole ne bangon tsagi ya kasance daidai gwargwado zuwa ga shaft ko axis kamar yadda zai yiwu. Idan bangon tsagi yana angle (tapered), zoben riƙon ba zai sami lebur da za a iya ɗauka ba. Wannan yana haifar da ɓangaren radial na ƙarfin axial, wanda ke aiki kamar kullun, yana ƙoƙarin tura zobe daga cikin tsagi. Yawancin ma'aunai suna ƙayyade matsakaicin mafi girman girman $0.005$ inci kowace inch na zurfin tsagi. Idan an ƙera tsagi tare da daidaitaccen injin niƙa na ƙarshe, 'radius' da ke ƙasan tsagi dole ne ya zama ƙasa da 'radius' ko 'chamfer' akan zoben kanta. A cikin manyan ayyuka na bambance-bambancen motoci, tsagi yana sau da yawa ƙasa bayan maganin zafi don tabbatar da cikakkiyar murabba'i da zurfin zurfi, yana haɓaka ƙarfin ƙwanƙwasa zoben karkace.
