Muab piv rau cov pa tho txawv lub taub hau, hom tshiab muaj qhov zoo hauv qab no:
1, Kev taw qhia los ntawm cov menyuam, nrog kev txhawb nqa ntau lub ntsiab lus thiab cov lus qhia ruaj khov.
2, Lub ntsiab lus sib cuag ntawm cov menyuam thiab cov phab ntsa sab hauv ntawm lub workpiece txo qhov kev sib txhuam thiab pro-longs lub neej siv;Qhov tseem ceeb tshaj, nws zam qhov teeb meem ntawm kev hloov cov ntaub ntawv qhia ntau zaus.
3, Cov khoom tsim tau tuaj yeem nce los ntawm ob npaug.
4, Qhov loj tuaj yeem hloov kho hauv thaj tsam ntawm 5 hli, nws tsis tas yuav hloov qhov chaw, yog li kev ua haujlwm yooj yim heev thiab txuag sijhawm.
Cov menyuam yaus siv lub teb chaws tus qauv, nws yooj yim heev kom tau txais ntawm tus nqi tsim nyog hauv kev ua lag luam, kev siv tus nqi qis.
Hom tshiab tho txawv lub taub hau yog sim dua, nws muaj qhov kev ua haujlwm ruaj khov thiab tau txais lub koob npe zoo los ntawm tus neeg siv.