Yog, cov hlau nplaum tuaj yeem raug machined. Txawm li cas los xij, cov hlau nplaum nyuaj yog qhov nyuaj heev rau kev siv lub tshuab, tsis zoo li cov roj hmab-hom hlau nplaum cov ntaub ntawv. Hlau nplaum yuav tsum tau machined nyob rau hauv unmagnetized xeev kom ntau li ntau tau, siv pob zeb diamond cov cuab yeej thiab / lossis cov log muag muag. Nyob rau hauv dav dav, nws yog qhov zoo tshaj plaws tsis sim ua tshuab cov hlau nplaum nyuaj cov ntaub ntawv tshwj tsis yog koj paub txog cov txheej txheem tshwj xeeb machining no.
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Tsom rau muab cov hlau nplaum daws rau 30 xyoo