1. Obere pneumatic ma ọ bụ nchara nchara. Ọ bụ ike eletriki ma ọ bụ ikuku abịakọrọ na-ebugharị, nke nwere ngwaọrụ iwepụ nchara kwesịrị ekwesị maka mmegharị ma ọ bụ ntụgharị, iji gboo ihe achọrọ nke oge dị iche iche. Dị ka igwe igwe akụkụ, ahịhịa waya, ihe na-ewepụ nchara nchara pneumatic, pneum...
N'ihi mmetụta na mbelata mmetụta nke abrasive na workpiece elu, workpiece elu nwere ike nweta ụfọdụ ịdị ọcha na dị iche iche roughness, si otú ahụ na-emeziwanye n'ibu Njirimara nke workpiece elu. Ya mere, melite ike ọgwụgwụ nke workpiece, dịkwuo adhe ...