Ukujula kophawu lwechashazi elijulile kujulile, ngokuvamile kungafinyelela ku-1mm, ngemva kokudweba uhlamvu, okungahlola ukuthi uhlamvu lucacile futhi.
Izosetshenziswa ku-Automobile, umsebenzi womzimba wesithuthuthu, uhlaka lwemoto, i-chassis yezimoto, injini, ingxenye engumshini, ithuluzi lomshini, ipayipi lensimbi, igiya, umzimba wepompo, i-valve, imikhiqizo ehlukahlukene yepulasitiki yobulukhuni, ingxenye yehadiwe, i-Aeronautics, i-Electronics, impi kanye nomkhakha wokukhanya. yokumaka insimbi, insimbi, ithusi, i-aluminium nezingxenye zepulasitiki nokumaka izingxenye zezimoto.