Granite Cheebtsam yog dav siv nyob rau hauv choj CMMs (Coordinate Measuring Machines) vim lawv siab stability thiab precision. Cov khoom no raug xaiv tshwj xeeb vim lawv cov thermal expansion coefficient tsawg, uas txhais tau hais tias qhov sib txawv me me ntawm qhov ntev thaum raug kub hloov. Txawm li cas los xij, tseem muaj qhov sib txawv ntawm qhov kub thiab txias uas cov khoom no tuaj yeem tiv taus.
Qhov kub ua haujlwm ntawm granite Cheebtsam yog nruab nrab ntawm 15 degree txog 35 degree (59 degree F txog 95 degree F). Sab nraum qhov no, qhov thermal expansion lossis contraction ntawm cov khoom tuaj yeem ua rau qhov ntsuas tsis raug thiab sib txawv ntawm qhov yuav tsum tau muaj. Txawm li cas los xij, ob peb degrees saum toj no lossis qis dua qhov no yuav tsis cuam tshuam rau CMM qhov kev ua tau zoo. Nws yog ib qho tseem ceeb kom tswj tau qhov kub thiab txias ib puag ncig kom ua tiav cov txiaj ntsig zoo thiab qhov tseeb ntawm kev ntsuas.
Txhawm rau kom ntseeg tau tias qhov ntsuas tau raug, tus choj CMM yuav tsum nyob hauv ib puag ncig uas tsis raug hloov pauv sai. Kev hloov pauv kub tuaj yeem ua rau muaj kev sib tsoo lossis tawg ntawm cov khoom siv granite, ntxiv ua rau muaj qhov tsis raug hauv kev ntsuas.
Ntxiv mus, nws yog ib qho tseem ceeb uas yuav tsum tau saib xyuas qhov ntsuas kub tsis tu ncua kom ntseeg tau tias nws nyob hauv qhov kev lees paub. Kub sensors tuaj yeem ntsia tau ze ntawm CMM los saib xyuas thiab tswj qhov kub tsis tu ncua. Nws tseem yuav tsum tau cia cov cuab yeej hloov kho rau hauv chav tsev kom ntsuas qhov tseeb.
Hauv kev xaus, qhov kub thiab txias rau cov khoom siv granite hauv choj CMMs yog qhov tseem ceeb los xyuas kom meej qhov tseeb ntawm kev ntsuas. Nws yog ib qho tseem ceeb kom tswj tau qhov kub thiab txias ib puag ncig thiab saib xyuas qhov ntsuas kub tsis tu ncua kom ntseeg tau tias qhov ntsuas tau raug. Nrog rau kev saib xyuas thiab kev saib xyuas kom zoo, cov khoom siv granite tuaj yeem siv tau ntau xyoo, ua haujlwm rau lawv lub hom phiaj hauv CMMs.
