Official Answer
Answer
Zoben karkace masu nauyi suna da bangon radial mafi girma $b$ da kauri $t$, wanda ke ƙara taurinsu $k_{radial}$. A cikin aikace-aikacen rami mai zurfi, dole ne a faɗaɗa zobe ko kwangila da yawa don share magudanar ruwa ko ƙugiya kafin isa ga tsagi. Ƙarfin da ake buƙata don shigarwa yana ƙaruwa tare da $ b^3$. Idan taurin ya yi yawa, hanyar 'Mandrel' na iya buƙatar taimako na ruwa. Bugu da ƙari, tsagi mai zurfi na iya kaiwa ga 'Ring Trapping' inda zoben ke da wahalar cirewa yayin tsagewar saboda ƙimar cirewar tana da nisa sosai. Dole ne masu ƙira su tabbatar da ƙimar cirewar ta kasance mai isa ga kuma cewa damuwan shigarwa bai wuce $0.8 imes S_y$ ba.
