Inqubo yokuqambaukwakhiwa kosayizi nokukhethwa kwenqubo kwenziwa ngesikhathi esifanayo, ngakho-ke, ekwakhiweni kosayizi wenqubo kufanele unake amaphuzu alandelayo:
(1) Landela umthetho wevolumu engashintshi, usayizi wenqubo yokuklama kufanele uhambisane namaphuzu abalulekile wenqubo ngayinye; Ngemva kwenqubo ethile, ivolumu ngaphambi kwenqubo ilingana nevolumu ephelele ngemva kwenqubo. Okubizwa ngokuthi umthamo ophelele ubhekisela kumthamo wemikhiqizo eqediwe etholakala ku-inqubo yokuqambakanye nevolumu yokulahleka kwempahla okwenzeka kule nqubo.
(2) Kudingekile ukulinganisa ukuguqulwa kosayizi othile we-billet ohlelweni lokuguqulwa kwenqubo ngayinye, futhi ugcine ukuncipha okwanele kanye nenani lomshwalense ukuze ugweme usayizi ngenxa yokubekezelelana. Isibonelo, ukubhoboza kuzonciphisa ukuphakama okubi ngokwedlulele, futhi ukuphakama kwe-billet kuzokhuphuka lapho kuvuselelwa kabusha.
(3) Usayizi womkhiqizo oqedwe kancane otholwe ohlelweni olulodwa kufanele uvumele inqubo elandelayo ukuthi iqhubeke kahle. Isibonelo, ngemuva kokudonsa ukucasula okude, awukwazi ukudonsa isikhathi eside, ngaphandle kwalokho ukuphoqa ukucasula kuyoba ukugoba okungazinzile.

(4) lapho kwakhiwa izingxenye, kuyadingeka ukuqinisekisa ukuthi ingxenye ngayinye ye-forging inomthamo owanele.
(5) Niniukuqambangemililo eminingi, ukuthi kungenzeka yini ukushisa phakathi komlilo ngamunye kufanele kucatshangelwe, njengokucabangela usayizi wenqubo, umlilo ophakathi, ukuthi ngabe imikhiqizo ephelile ingafakwa yini ebusweni besithando sokushisa nezinye izindaba.
(6) Kwaneleama-forging wokugcinakumele ilungiswe ukwenza iindawo yokuqambabushelelezi nobude nosayizi ofanele.
Isikhathi esideama-shaft forgingslapho ubukhulu besiqondiso sobude bunembile kakhulu, kufanele kulinganiselwa ukuthi usayizi wobude uzonwetshwa kancane lapho ugqoka.
Ngobaama-shaft forgingsekhanda elinqunyiwe ukuze lihambisane nezinhlinzeko.