Imashini itwara imashini ikoreshwa mu kwikorera imitwaro ya axial na radial cyane cyane mu cyerekezo cya axial, ariko umutwaro wa radiyo ntushobora kurenga 55% yumutwaro wa axial.Ugereranije nubundi buryo bwo gusunika roller, ubu bwoko bwo gutwara bufite coefficient de fraisse yo hasi, umuvuduko mwinshi hamwe no guhuza ibikorwa.