Official Answer
Answer
Ƙarfin ƙwanƙwasawa na taron ɗimbin ɗimbin karkace shine ƙarami na juzu'in zobe da tsagi kayan juye. Ƙarfin ƙarar zobe $P_r$ shine $P_r = (A_r \cdot \ tau_{ring}) / S_f$, inda $A_r$ shine yanki na zobe kuma $\tau_{ring}$ shine ƙarfin shear (kimanin sau 0.6 na ƙarfi). An ƙididdige ƙarfin ƙarfin tsagi $ P_g$ a matsayin $ P_g = (D \ cdot d \ cdot \ pi \ cdot \ sigma_y) / S_f $, inda $ D $ shine diamita shaft, $ d$ shine zurfin tsagi, kuma $ \ sigma_y $ shine ƙarfin yawan amfanin ƙasa. Kuskure ne na kowa a yi watsi da gefen gefen; Nisa daga tsagi zuwa ƙarshen ramin dole ne ya zama aƙalla $3 \ cdot d$ don hana bangon tsagi daga shearing fita. Ana amfani da ma'aunin aminci $S_f$ na 2 ko 3.
