Dị ka isi akụrụngwa nke ogbugba ogbugba igwe, ogbugba ogbugba igwe na-ekpebi kpọmkwem ihicha mmetụta nke ogbugba ogbugba igwe.Ọ bụ nchara nchara nke na-abanye n'ime igwe ihe nbata nke ogbugba ogbugba n'ime wiil nke gbara agba, wee kesaa igwe nchara nchara na igwe ọ bụla nke igwe na-agbawa agbawa, na agụba a na-ebugharị igwe na-agba ọkụ ka ọ tụba ya. ígwè gbara na nnukwu ọsọ na-emetụta elu nke workpiece iji nweta mmetụta nke ihicha elu nke workpiece.