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Iibhereyini ze-spherical roller luhlobo lwendawo yokuqengqeleka enokuxhasa zombini umthwalo we-radial kunye ne-axial kwicala zombini. .. Zibonakaliswa kuyilo lwazo olukhethekileyo, ebandakanya imiqolo emibini yee-spherical rollers eziqengqeleka kwindlela yomdyarho wangaphakathi kunye nomdyarho ongaphandle we-convex .. Le ijiyometri ibavumela ukuba balungiselele ukulungiswa okungalunganga kwe-angular, isenza ukuba ilungele ngokukodwa