Answer
Lokacin da aka matsa magudanar ruwan igiyar ruwa, tsayin dawafin waya ya kasance kusan akai-akai, yana haifar da faɗaɗa matsakaicin diamita $D_m$. Don maɓuɓɓugar ruwa a cikin rami, wannan faɗaɗa yana takura. Fadada $ Delta D$ na iya kusanta ta $\Delta D = 0.02 \cdot \frac{w^2 - f^2}{D_m}$, inda $w$ shine tsayin igiyar ruwa kuma $f$ shine jujjuyawa. Idan izinin da ke tsakanin bazara OD da ƙugiya bai isa ba, gogayya tsakanin bazara da bangon da ba a iya gani ba yana haifar da madaidaicin madauki a cikin lanƙwan jujjuyawar lodi. Wannan 'daurin' yana ƙara taurin kai kuma yana iya haifar da ƙayyadaddun damuwa $\sigma_{total} = \sigma_{lakwasawa} + \sigma_{friction}$. Dole ne injiniyoyi su tabbatar da OD a tsayin aiki $OD_{aiki} = OD_{kyauta} + \rubutu{fadada}$ bai kai $D_{bore}$ don kiyaye daidaiton nauyin da aka annabta ba.
