Official Answer
Answer
Don zoben riƙon karkace don isa ga ƙimar ƙarfinsa, bangon tsagi dole ne ya zama murabba'i gwargwadon yuwuwar (mafi girman $90^{\circ} + 0.5^{\circ}$). Idan bangon tsagi yana 'radiused' ko 'chamfered' saboda machining da bai dace ba, zoben zai kasance da hali don zame bangon a ƙarƙashin nauyin axial, yana haifar da sashin ƙarfin radial wanda zai iya haifar da zobe don faɗaɗa kuma 'fitowa.' Dangane da jagororin injiniya na Smalley, matsakaicin radius da aka yarda da shi a kasan tsagi shine yawanci $10% $ na kaurin zobe. Idan ana buƙatar babban radius don ƙarfin gajiyar shaft, dole ne a yi amfani da mai wanki mai goyan baya tsakanin zoben da kusurwar radiyo don samar da filin zama mai murabba'i.
