Answer
Ƙarfin jujjuyawar zoben riƙewa na karkace na waje shine saurin da ƙarfin centrifugal ke haifar da faɗaɗa zobe da rasa lamba tare da gindin tsagi. Ana ƙididdige madaidaicin izinin RPM $N $ a matsayin $N = \ frac{1}{\pi} \sqrt{\frac{4.48 E I g}{w r^3 (1+K)}}$, inda $E$ shine ma'auni, $I$ shine lokacin inertia na sashin giciye, $g$ shine nauyi, $w$ shine tsakiyar radi zuwa inch na $ mu. nauyi, kuma $K$ wani abu ne da ke da alaƙa da 'clinch' ko tsangwama na zobe a cikin tsagi. Idan RPM mai aiki ya wuce wannan ƙima, zoben na iya 'yawo' daga cikin tsagi, wanda zai haifar da mummunar gazawar taron. Don aikace-aikace masu sauri kamar turbochargers, ana amfani da zoben karkace na 'kulle kai', inda wani shafi akan makullin juyawa na ciki ya zama ramin kan jujjuyawar waje don hana haɓakawa.
