Answer
Ƙarfin ƙwanƙwasa taron ɗimbin zobe yana iyakance ta asali ta zurfin tsagi $d$. Dabara don ƙyale ɗora nauyi dangane da nakasar tsagi shine $P_g = \ frac {D d π σ_y}{S}$, inda $D$ shine diamita na shaft/bore, $d$ shine zurfin tsagi, kuma $\sigma_y$ shine ƙarfin samar da kayan tsagi. Ƙara $d$ yana ƙara ƙarfin aiki amma kuma yana ƙara damuwa akan zobe yayin shigarwa, kamar yadda dole ne a fadada zobe don share shaft. Haɓakawa ya haɗa da nemo wuri mai daɗi' inda $d$ ke da zurfin isa don samar da ƙimar aminci na $2$ akan nauyin axial da aka yi amfani da shi yayin tabbatar da damuwa na shigarwa $\sigma_i = \frac{E t (D_{groove}-D_{free})}{D_{tsagi} D_{free}}$ baya sa zobe ya saita. Don zoben juyi 2, ingantaccen kauri $T$ ya ninka sau biyu, amma zurfin tsagi $d$ ya kasance babban maƙasudi ga amincin gidaje.
