Tom qab txhua lub sijhawm koj ntxuav, so, lossis ntxuav cov saw nrog cov kuab tshuaj, nco ntsoov ntxiv cov roj nplua nyeem thiab xyuas kom meej tias cov saw puas qhuav ua ntej ntxiv cov roj nplua nyeem. Ua ntej, cov roj lubricating yog infiltrated rau hauv cov saw cov kabmob, thiab tom qab ntawd nws ua viscous lossis qhuav. Qhov no yuav ntseeg tau ntub lub qhov ntawm cov saw uas yooj yim hnav (ob pob qij txha ntawm ob sab). Cov tshuab ua kom dej zoo, uas pib hnov zoo li dej, nws yooj yim rau nkag, tab sis dhau sijhawm lawv ua nplaum lossis qhuav, uas tuaj yeem siv sijhawm ntev.
Tom qab ntub cov roj, siv daim ntaub qhuav los so cov roj ntau dhau ntawm cov saw hlau kom tsis txhob muaj qhov nplaum ntawm cov av thiab hmoov av. Ua ntej rov txhim kho txoj saw, nco ntsoov ntxuav kev sib txuas ua ke kom ntseeg tau tias tsis muaj av seem. Tom qab cov saw tu, nws yog qhov yuav tsum tau muab qee cov roj nplua nyeem rau sab hauv thiab sab nraud ntawm daim tsho tom qab sib dhos cov khawv koob txiav tawm.
