Official Answer
Answer
Zobba masu riƙe da karkace yawanci suna rauni tare da gibin sifili (ko ɗan zoba). Tashin hankali na radial $F_r$ da ake buƙata don faɗaɗa zobe don shigarwa ya yi daidai da $\frac{E \cdot I}{R^2}$. Zane-zane na sifili yana tabbatar da lamba na 360-digiri tare da tsagi, wanda ke da mahimmanci don rarraba kaya iri ɗaya. Idan an gabatar da rata, ana rage ƙarfin matsawa kusa da wurin tazarar. A lokacin shigarwa, zoben yana karkata zuwa cikin tsagi; Babban gibi na iya yin sauƙi shigarwa na hannu amma yana rage 'manne' ko kama zoben da ke kan gindin tsagi, wanda ke da mahimmanci don riƙe matsayi a ƙarƙashin girgiza ko juyawa mai sauri.
