1. Thaum tho qhov steel, thov ua kom muaj peev xwm ua kom txias thiab siv cov hlau txiav kua.
2. Kev nqus cov yeeb nkab zoo nruj thiab qhia cov kev sib cais ciav hlau tuaj yeem txhim kho txoj kev tho thiab qhov laum lub neej.
3. Thov saib xyuas kom lub tiaj thiab huv ntawm qhov sib nqus puag ncig thiab cov haujlwm ua haujlwm.
4. Thaum tho daim hlau nyias nyias, txhawb rau qhov khoom ua haujlwm. Thaum drilling loj workpieces, xyuas kom meej qhov ruaj ntseg ntawm workpieces.
5. Thaum pib thiab xaus ntawm qhov drilling, qhov pub nqi yuav tsum raug txo kom tsawg 1/3.
6. Rau cov khoom siv nrog cov hmoov ntau ntawm cov hmoov zoo thaum lub sij hawm drilling, xws li cam khwb cia hlau, nrum tooj liab, thiab lwm yam.
7. Thov nqa cov hlau chips twined rau lub laum lub cev kom raws sijhawm kom paub meej cov nti tawm zoo.
