Workpiece nto smoothness. Thaum cov neeg siv khoom siv, lawv feem ntau ntsib ntau qhov khawb ntawm qhov chaw. Teb rau qhov teeb meem no, Anebon yuav siv ntau yam kev ntsuas. Lawv yuav tsum ua kom tiav ib zaug thaum txiav cov khoom. Secondary processing yog ib-txiav txiav, tsis tshwm sim ntau yam. Yog tias qhov teeb meem no tsis tuaj yeem zam tau, ces qhov saum npoo yuav tsis ci ntsa iab, tab sis yuav muaj qee qhov kev xav matte, yog li cov khawb yuav luag tsis muaj nyob.