1) Urutonde rwa diameter nomero hamwe na diameter isabwa
Diameter nominal yibyuma biri hagati ya 6 na 50mm, naho ibipimo bisanzwe byasabwe kumurambararo wibyuma ni 6, 8, 10, 12, 14, 16, 20, 25, 32, 40, na 50mm.
2) Kwemererwa gutandukana kumiterere yubuso nubunini bwicyuma cyimbavu
Igishushanyo mbonera cyimbavu zihinduranya zimbavu zicyuma zigomba kuba zujuje ibi bikurikira:
Inguni β hagati y'urubavu ruhinduranya na axe y'icyuma ntigomba kuba munsi ya dogere 45.Iyo inguni yashyizwemo itarenze dogere 70, icyerekezo cyimbavu zinyuranye kuruhande rwicyuma kigomba kuba gihabanye;
Umwanya wizina l wurubavu ruhinduranya ntushobora kurenza inshuro 0.7 diameter nominal yumurongo wibyuma;
Inguni α hagati yuruhande rwurubavu runyuranyije nubuso bwicyuma ntigomba kuba munsi ya dogere 45;
Igiteranyo cyu cyuho (harimo ubugari bwimbavu ndende) hagati yimpera yimbavu zinyuranye kumpande ebyiri zegeranye zumuringa wicyuma ntizishobora kurenza 20% ya perimetero nominal yumurongo wibyuma;
Iyo diameter nominal yumurongo wibyuma itarenze 12mm, agace kagereranijwe kagomba kuba munsi ya 0.055;iyo diameter nominal ari 14mm na 16mm, agace k'urubavu kagereranijwe ntigomba kuba munsi ya 0.060;iyo diameter nominal irenze 16mm, agace k'urubavu kagereranijwe ntigomba kuba munsi ya 0.065.Reba kumugereka C kugirango ubare agace kagereranijwe.
Ububiko bw'ibyuma busanzwe bufite imbavu ndende, ariko kandi nta rubavu rurerure;
3) Uburebure kandi byemewe gutandukana
A. Uburebure:
Ubusanzwe ibyuma bitangwa muburebure bwagenwe, kandi uburebure bwihariye bwo gutanga bugomba kwerekanwa mumasezerano;
Utubari dushimangira dushobora gutangwa muri coil, kandi buri reel igomba kuba rebar imwe, ikemerera 5% yumubare wa reel muri buri cyiciro (reel ebyiri niba zitari ebyiri) zigizwe na rebar ebyiri.Uburemere bwa disiki na diameter ya disiki bigenwa binyuze mubiganiro hagati yabatanga nuwaguze.
B. kwihanganira uburebure:
Gutandukana byemewe kuburebure bwibyuma iyo bigeze kuburebure bwagenwe ntibishobora kurenza ± 25mm;
Iyo uburebure ntarengwa busabwa, gutandukana kwayo ni + 50mm;
Iyo uburebure ntarengwa busabwa, gutandukana ni -50mm.
C. kugabanuka no kurangira:
Impera yumurongo wibyuma igomba gukemurwa neza, kandi ihinduka ryaho ntirigomba kugira ingaruka kumikoreshereze.
