Nyob rau hauv ib txwm muaj xwm txheej, cov cemented carbide pom cov hniav muaj cov saw saw thiab cov hniav carbide cemented. Carbide pom cov hniav yog yeej tuaj txawv teb tam sim no. Cov xaim txhuas siv nyob rau hauv cov ntaub ntawv zoo nkauj pom cov hniav tau thicker thiab loj dua, vim hais tias xws li alloy pom cov hniav tuaj yeem ntse ntau zaus thiab muaj kev pab lub neej ntev. Lub vuam zoo ntawm cemented carbide kuj tseem ceeb heev. Lub vuam leeg yuav tsum ua nyias nyias thiab nyias hnav nyias, thiaj li ua rau cov hniav tuaj yeem Nrog rau kev txiav ntau dua kev txiav.
Qhov zoo ntawm lub kaw hniav yog qhov tseem ceeb heev. Vim tias cov hniav saw kho nws txoj kev sib hloov, nws yuav tsum xa cov zog txiav thiab tswj kev ua haujlwm ruaj khov. Ib qho zoo pom hniav tsis tsuas yog muaj qhov zoo li qub geometric qhov ntev thiab qhov tseeb, tab sis qhov tseem ceeb tshaj, nws cov yam ntxwv dynamic.
Tsis zoo li cov pob zeb diamond pom hniav, thaum lub saw hniav txuas ntxiv txiav, lub tshav kub tsim los ntawm cov hlau pom cov hniav txiav yuav ua rau cov saw saw, uas yuav nce qhov kub ntawm lub rooj tsavxwm pom. Hauv qhov no, lub rooj tsavxwm siab pom tau tuaj yeem tswj qhov tseeb ntawm nqe lus. Cov khoom siv tsis zoo pom hniav yuav warp lub rooj tsavxwm pom, uas cuam tshuam rau kev txiav qhov tseeb. Lub zog ruaj khov ntawm cov saw saw yog qhov tshwj xeeb yog qhov tseem ceeb rau qhov xwm txheej tseeb ntawm ob peb saw hniav siv hauv pawg.