Hauv cov txheej txheem kev nkag siab cov khoom siv hlau pom, cov khoom siv no tuav txoj haujlwm tseem ceeb hauv kev txiav ntawm cov khoom brittle thiab nyuaj, uas tuaj yeem txhim kho qhov kev ua tau zoo tag nrho. Cov qauv ntawm cov khoom siv kuj yog yooj yim. Peb lub tshuab hlau pom cov kab ua ke ntawm flywheel, phau ntawv qhia lub log, xaim pom saw thiab lwm qhov chaw, thiab nws kuj tuav txoj haujlwm tseem ceeb hauv cov txheej txheem ntau lawm.
Nws tuaj yeem nkag siab los ntawm kev siv tshwj xeeb ntawm cov hlau pom tias kev ua haujlwm thaum lub sijhawm siv nws feem ntau yooj yim, tshwj xeeb tshaj yog thaum qhov tob feem ntau xaiv cov dej num thaum lub sijhawm ua haujlwm. Ntxiv mus, peb cov cav tov kuj hloov mus rau qhov chaw ua haujlwm, yog li cov nyhuv ua haujlwm zoo heev thaum txiav cov vuas tuab phab ntsa, pob zeb thiab lwm yam khoom.
Nyob rau hauv tus txheej txheem ntawm kev nkag siab txog hom hlau no pom cov khoom, tib neeg tuaj yeem nkag siab tias kev ua haujlwm ntawm hom khoom no yooj yim heev thiab tuaj yeem txo tus nqi zog. Yog li ntawd nyob rau hauv cov nqe lus ntawm ntau lawm, nws muaj peev xwm pom tau hais tias qhov no yog tseeb yooj yim dua thiab ntau yig kev xaiv. Yog lawm, tus nqi ntawm cov khoom siv nws tus kheej thiab tus nqi ntawm kev saib xyuas kuj raug nqi-zoo.
