There is increasing use of computer aided design (CAD) systems for i mechanical design. They make it convenient to present drawings in 3D to the designer, and hence offer a better view of parts mating together at assembly. Parts are drawn in CAD to nominal dimensions and can be checked for interference, using extreme case tolerances.
Not all CAD systems can be used for tolerance analysis; some of the mechanical parts can be created using different CAD system formats, and cannot be mated together as an assembly on master CAD screens without the use of expensive translators. Tolerance analysis involves the understanding of the functionality of the product and knowledge of the processes that are used in making the parts. Even if the CAD system has been used for making the prototypes, and parts were mated successfully at that stage, a separate tolerance analysis study should be done to ensure high quality in production.
Kuna kuongezeka kwa matumizi ya kompyuta kusaidiwa kubuni (CAD) mifumo kwa i kubuni mitambo. Kwa hivyo, ni rahisi kwa mtengenezaji kutoa michoro ya 3D, na kwa hivyo kutoa mtazamo bora wa sehemu zinazoshirikiana wakati wa mkusanyiko. Sehemu ni kuchorwa katika CAD kwa vipimo nominal na inaweza kuwa checked kwa ajili ya kuingiliana, kutumia kesi kali uvumilivu. Si mifumo yote ya CAD inaweza kutumika kwa uchambuzi wa uvumilivu; baadhi ya sehemu za mitambo zinaweza kuundwa kwa kutumia muundo tofauti wa mfumo wa CAD, na haziwezi kuunganishwa pamoja kama mkutano kwenye skrini za CAD za bwana bila matumizi ya watafsiri wa gharama kubwa. Uchambuzi wa uvumilivu unahusisha uelewa wa utendaji wa bidhaa na maarifa ya michakato inayotumiwa katika kutengeneza sehemu. Hata kama mfumo CAD imekuwa kutumika kwa ajili ya kufanya prototypes, na sehemu walikuwa mated kwa mafanikio katika hatua hiyo, tofauti uvumilivu uchambuzi utafiti lazima kufanyika kuhakikisha ubora wa juu katika uzalishaji.