Cov lus NC (Numerical Control) thiab CNC (Computer Numerical Control) qhia txog ob qhov kev pheej hmoo ntawm kev tshuaj lij tshwj tsis muaj neeg ntxiv, uas CNC yog qhov pheej hmoo tseem ceeb ntawm NC. Txij li kawg kom paub meej txog qhov kev pab cuam no ntawm kev tshuaj lij tshwj tsis muaj neeg ntxiv. NC tshuaj, uas yog qhov ua ntej, txuas nrog rau cov lus qhia los ntawm ib qhov chaw ntau dua, feem ntau yog ib qhov phiaj lossis ib qhov peev xwm, nws lub chaw tswj xyuas yog ib qhov chaw siv los siv rau kev siv cov phiaj zoo li cov lus qhia rau kev txuas ntxiv thiab kev tshuaj. Qhov system no tsis muaj computer hauv nws; lub program tsis raug sau nrog hauv memory thiab tsis tuaj yeem hloov tau ntau. Kev hloov ib yam yuav tsum tsim ib qhov phiaj tshiab, ib qhov kev tshwm sim uas nyuaj thiab feem ntau tshwm sim sai. Qhov tshuaj muaj peev xwm tsis tuaj yeem hloov tau los ntawm nws cov khoom siv. Tom qab ntawv, CNC tshuaj muaj ib computer tseem ceeb (lub machine control unit) nyob hauv nws lub si. Computer no tsis yog tsuas yog siv rau kev siv, tab sis kuj sau nrog programs hauv nws lub memory, txhawj xeeb rau kev kho, kev hloov, thiab kev tiv thaiv tsis muaj chaw ntau dua. Qhov kev hloov no pab tau rau kev siv ntau yam: kev siv cov lus qhia tseem ceeb, cov lus qhia leeg, thiab kev siv cov lus qhia tshwj tsis muaj neeg ntxiv; tus neeg siv tuaj yeem hloov kho los ntawm ib keyboard thiab pom cov lus qhia hauv ib digital display; thiab tshuaj tuaj yeem sim qhov kev ncav ncav nrog rau kev tshuaj ntxiv ua ntej tsis muaj kev tshuaj, kom tiv thaiv kev puag ncig. Ntawm qab no, kev sib txuas nrog computer pab tau rau kev sib txuas nrog servomotors thiab encoders, uas thiaj li tuaj yeem tshawb nrhiav thiab kho qhov chaw tshuaj ntxiv hauv qhov kev tshwm sim, kom zoo dua li qhov system feem ntau nyob hauv NC tshuaj ua ntej. Tej zaum "NC" thiab "CNC" yog siv piv luag nyob hauv kev sib lus, tab sis qhov sib txawv yog tseem ceeb hauv kev sib lus tshwj tsis. NC qhia txog ib qhov kev tshwm sim tseem ceeb hauv kev tshwm sim, thaum CNC qhia txog qhov tseem ceeb tshiab uas muaj computer, uas muaj kev tiv thaiv, kev tiv thaiv, thiab kev tiv thaiv tseem ceeb. Tag nrho CNC tshuaj tshiab yog tsim los ntawm qhov kev tshwm sim tseem ceeb ntawm NC, tab sis lawv tau tshwm sim ntau dua los ntawm kev siv computer.
Peb lub neej koom hauj khwv loj tuaj yeem pab koj thaum twg los.