Nkọwa usoro:A na-awụnye ihe na-arụ ọrụ n'ime hopper m (ya na mmiri) site na etiti ihe, na e nwere ngwaọrụ vibration n'okpuru hopper.Ngwaọrụ na-ama jijiji na-arụ ọrụ iji kesaa ihe arụrụ arụ na hopper na eriri ebu ebuli elu.Enwere oghere magnetik siri ike na azụ nke eriri ebu, nke na-eme ka ihe arụ ọrụ na-agba ọsọ na trajectory na-acha uhie uhie n'elu.Mgbe magnetik siri ike ruru n'elu, a na-emegharị ya, na workpiece na-adaba n'ụgbọelu na-arụ ọrụ nke usoro ahụ.