Igwe ihe eji eme ihe na-edozi onwe ya nwere ahịrị okpukpu abụọ nke rollers, yana ụzọ ịgba ọsọ na-agba ọsọ na mgbanaka mpụta yana ụzọ ịgba ọsọ abụọ n'ime mgbanaka dị n'ime, nke a na-atụgharị n'akụkụ akụkụ n'akụkụ axis ibu.Ihe owuwu a nwere ọgụgụ isi na-enyere ya aka inwe ọrụ nke ntinye aka na-akpaghị aka, n'ihi ya, ọ dịghị mfe emetụta akụkụ nke ogwe osisi na oche igbe na-ebufe na njehie ma ọ bụ na-ehulata, nke kwesịrị ekwesị maka njehie nrụnye ma ọ bụ nkwụsịtụ nke ihe kpatara njehie Angle kpatara. .Ihe nkedo ahụ nwere ike iburu ibu radial yana ibu axial bidirectional.