Nws yog cov xwm txheej ib txwm muaj, vim hais tias cov saw yuav hnav thiab ncab tom qab ib ntus, cov saw yuav xoob, thiab cov saw yuav tsum tau muab kho kom raws sijhawm. Tom qab hloov kho, cov saw hlau yuav tsum tsis txhob ntab ntau dua 2.5CM. Thaum cov ntsia hlau tau kho kom haum rau lub taub hau, yog tias tseem muaj, siv cov saw hlau txiav tawm rau ntu thiab txiav thaum hloov cov saw hlau thiab lub log tau hnav tawm.
Thaum lub tsheb tshiab xa tawm ntawm lub hoobkas, cov saw hlau tau kho kom nruj. Thaum txoj saw tshiab yuav siv, nws yuav ntev dua, thiab cov saw hlau ntawm lub tsheb tshiab yuav tsum tsis txhob muab kho tam sim ntawd thaum nws tsuas siv. Qhov kev hloov pauv tuaj yeem ua tiav. Raws li cov xwm txheej ib txwm, qaum thiab qis sag ntawm cov saw yog 25 hli. Kho lub chaw nres tsheb tom qab rub tawm txoj saw hlau mus txog rau qhov ntau no. Nws yuav tsum tsis txhob dhau ib qho los yog ib qho dhau ib qho, thiab nws yuav tsis loj hlob sai heev yav tom ntej. Lub cev nruj dua hloov kho, nws yuav nrawm dua, tab sis cov saw thiab sprocket ntawm lub tsheb tshiab kuj yuav tsum tau meshed, yog li cov saw hlau ntawm lub tsheb tshiab feem ntau nruj thaum nws tawm ntawm lub hoobkas.
