(1) ntuziaka ọrụ n'ibu polishing: bụ site na ịcha, ihe n'elu plastic deformation wepụrụ mgbe polishing na convex na-eji ire ụtọ n'elu polishing usoro, n'ozuzu na-eji mmanụ, wool wheel, sandpaper, wdg, na-nyere mkpa na ntuziaka ọrụ, pụrụ iche akụkụ ndị dị otú ahụ. dị ka rotary elu, ...
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