Official Answer
Answer
An ƙididdige damuwar shigarwa $S_i$ don zoben karkace kamar $S_i = _x000c_rac{E imes t imes ext{expansion}}{D^2}$. Koyaya, bangon radial $ w$ (faɗin waya) shima yana ƙayyade ƙarfin da ake buƙata don faɗaɗa (na waje) ko kwangila (na ciki) zoben. Faɗin bangon radial $ w$ yana ƙara lokacin zobe na inertia $ I = _x000c_rac{t w^3}{12}$, yana sa ya fi wahala a girka da ƙara haɗarin nakasar dindindin idan haɓaka ya wuce iyakar kayan abu. Dole ne injiniyoyi su inganta $w$ don tabbatar da isassun 'manne' akan shaft ba tare da sanya zobe ya yi tauri ba ta yadda ba za a iya sanya shi a kan ƙarshen shaft ɗin ba.
