1. Choyamba, yang'anani ngodya ya ulusi
Njira yolondola kwambiri ndiyo kuyeza ndi ulusi woyezera. 60° ndi muyezo waku America, ndipo 55° ndi muyezo waku Britain.
Ngati palibe zida zomwe zilipo, pa ulusi wa mapaipi, mutha kuwona njira yotsekera: Ulusi wa NPT wokhazikika waku America nthawi zambiri umatsekeredwa ndi taper ya ulusi wokha; Ulusi wa BSP wokhazikika waku Britain (monga BSPT, BSPP) uli ndi ngodya ya ulusi wa 55°, ndipo ulusi wa BSPP wofanana umafunika kudalira mphete yotsekera kuti utseke.
2. Magawo owunikira kiyi (kukula ndi TPI)
Kwa zomangira monga mabolts ndi mtedza zokhala ndi maulumikizidwe olumikizidwa, mutatha kuyeza dayamita yayikulu (dayamita yakunja ya ulusi wakunja / dayamita yamkati ya ulusi wamkati), chinthu chofunikira kwambiri ndikuwerengera kuchuluka kwa ulusi pa inchi (TPI), kenako onani motsatira buku lokhazikika.
Pa ulusi wa mapaipi, kuwonjezera pa kuyeza miyeso, muyeneranso kudziwa ngati ndi ulusi wochepa (monga NPT, BSPT) kapena ulusi wowongoka (monga BSPP), komanso njira yotsekera.
3. Yang'anani mwachindunji khodi yokhazikika
Ngati pali chizindikiro chokhazikika pa gawolo (monga UNC, UNF, BSW, BSF, NPT, BSPP, ndi zina zotero), ichi ndiye maziko odalirika kwambiri.
Bwererani ku gwero
Ulusi wokhazikika wa ku Britain unachokera ku ulusi wa Joseph Whitworth wa madigiri 55 wa Whitworth mu 1841;
Ulusi wokhazikika wa ku America unaperekedwa ndi William Sellers mu 1864 ngati ulusi wa madigiri 60.
Ndipotu, panthawi ya Nkhondo Yachiwiri Yapadziko Lonse, miyezo ya Britain ndi America inayambitsa mavuto akulu pakusinthana kwa zida pakati pa magulu ankhondo a Allied. Chifukwa chake, mu 1948, United States, United Kingdom, ndi Canada pamodzi adapanga muyezo umodzi (UNC/UNF).
Chochititsa chidwi n'chakuti, kuyambira mu 1961, mabungwe apadziko lonse lapansi oyenerera adagwiritsa ntchito muyezo wa ulusi waku Britain, ISO R 228. Chifukwa chake tsopano, ulusi waku Britain ndi muyezo wolimba womwe umagwiritsidwa ntchito padziko lonse lapansi.
Nthawi yotumizira: Feb-05-2026
