Nto roughness ntawm mechanical qhov chaw ua yog ib qho tseem ceeb kev ntsuas qhia txog micro-geometric yuam kev ntawm cov khoom siv ua haujlwm saum npoo, yog lub hauv paus tseem ceeb rau kev ntsuam xyuas qhov zoo ntawm txheej txheej ntawm cov khoom, ncaj qha ntsig txog cov khoom zoo, kev pab cuam lub neej, tus nqi khoom. Cov txheej txheem ntawm kev xaiv qhov roughness ntawm cov khoom siv tshuab yog cov txheej txheem suav, cov txheej txheem kuaj thiab cov kev sib piv.
Ib qho kev siv ntau hauv kev tsim machining ntawm cov khoom siv tshuab yog qhov kev sib piv, uas yooj yim, ceev thiab tsim nyog. Daim ntawv thov yuav tsum muaj cov ntaub ntawv tsim nyog thiab ntau yam ntaub ntawv thiab cov ntaub ntawv pov thawj tau muab rau hauv ntau yam kev qhia txog kev tsim kho tshuab tam sim no. Feem ntau, nto roughness yog sib xws nrog dimensional kam rau ua theem. Feem ntau, qhov me me ntawm tus qauv tolerances tau teev tseg rau kev siv tshuab thiab tsim cov khoom siv tshuab, qhov me me ntawm qhov roughness ntawm cov khoom siv tshuab, tab sis tsis muaj kev sib raug zoo ntawm lawv.
Mechanical qhov chaw machining lub zog yog lub peev xwm ntawm qhov tsis ua kom tawg los yog ua rau ntau tshaj qhov tso cai ntawm cov yas deformation thaum ua haujlwm, thiab yog qhov yooj yim tshaj plaws rau txhua qhov kev ua haujlwm ib txwm muaj thiab kev nyab xeeb ntawm cov khoom siv. Standard countermeasures los txhim kho lub zog ntawm qhov chaw yog: nyob rau hauv thiaj li yuav nthuav cov specifications ntawm qhov pheej hmoo cross-section ntawm cov khoom, nthuav lub sij hawm ntawm inertia ntawm tus ntoo khaub lig-section, zoo tsim rooj plaub ntawm tus ntoo khaub lig-section; kev siv cov ntaub ntawv muaj zog, cov ntaub ntawv raw los nthuav cov txheej txheem kho cua sov los txhim kho lub zog thiab txo cov thermal kev nyuab siab, kev tsim cov txheej txheem los txo lossis tshem tawm cov kev tsis txaus ntawm microscopic, thiab lwm yam.; txhawm rau txo cov load ntawm qhov chaw kom txo tau qhov kev ntxhov siab, thiab lwm yam, cov qauv ntawm cov khoom yuav tsum tau ua kom zoo.