1. Thaum qhov chaw pib ntawm cov xov hlau twisted yog qhov tseeb, ces cov xov hlau twisted tuaj yeem pib, thiab cov txheej txheem dav tuaj yeem kuaj tau los ntawm kev nres ntawm ob qhov kawg.
2. Kev ntsuas qhov dav ntawm lub cev pob txha thiab qhov chaw pib yog thawj qhov tseem ceeb, thiab nws tseem yog qhov tseem ceeb tshaj plaws.
3. Qhov luaj li cas ntawm txoj kab uas hla uas qhia los ntawm cov hlua khi yog qhov tseeb ntawm txoj kab uas hla, yog li nws yog ib qho tsim nyog yuav tsum tau ntxiv cov thickness ntawm cov enamel txheej txheej thaum teeb tsa cov hlau txoj kab uas hla kom raug.
4. Thaum siv txhuas hlau, koj yuav tsum tau xyuam xim rau nws. Qhov nro yuav tsum tau kho kom tsawg dua li ntawm tooj liab hlau ntawm tib lub thickness, yog li kom tsis txhob cov hlau txoj kab uas hla yog thinned thiab cov txheej insulating xim bursting, yog li nws yuav cuam tshuam rau qhov zoo ntawm cov khoom.
5. Qhov ceev ntawm txoj kab tsis haum rau kev ceev dhau (overspeed), tab sis peb yuav tsum tau them sai sai rau seb qhov nruab nrab thiab qis torque puas txaus.
6. Qhov kev ncua deb ntawm lub qhov hluav taws xob cable thiab lub cev pob txha yuav tsum tsis txhob nyob deb dhau, nws yuav cuam tshuam rau qhov tseeb ntawm cov cable txuas.
