Inqubo yokwakhaUkwakheka kosayizi nokukhethwa kwenqubo kwenziwa ngasikhathi sinye, ngakho-ke, ekwakhiweni kosayizi wenqubo kufanele kunake amaphuzu alandelayo:
(1) Landela umthetho wevolumu engaguquki, usayizi wenqubo yokuqamba kufanele uvumelane namaphoyinti asemqoka wenqubo ngayinye; Ngemuva kwenqubo ethile, ivolumu ngaphambi kokuba inqubo ilingane nevolumu eliphelele ngemuva kwenqubo. Ivolumu okuthiwa inani eliphelele libhekisela kwivolumu yemikhiqizo eqediwe etholwe kuInqubo yokwakhakanye nevolumu yokulahleka kwezinto ezibonakalayo kwenzeka kwinqubo.
. Isibonelo, ukubhoboza kuzonciphisa ukuphakama okubi kakhulu, futhi ukuphakama kwe-billet kuzokwanda lapho kuvuleka.
(3) Ubungako bomkhiqizo osuqediwe otholwe kwinqubo eyodwa kufanele bukwazi ukwenza inqubo elandelayo iqhubeke kahle. Isibonelo, ngemuva kokudonsela ukucasuka isikhathi eside, akunakudonswa isikhathi eside, ngaphandle kwalokho okhungathekisayo ngeke kugobeke.

(4) Lapho kwakheka izingxenye, kuyadingeka ukuqinisekisa ukuthi ingxenye ngayinye yokuvuza inevolumu eyanele.
(5) laphoukuthethelelaNgemililo eminingi, amathuba okushisa maphakathi nomlilo ngamunye kufanele abhekwe, njengokucabanga ngosayizi wenqubo, umlilo ophakathi nendawo, ukuthi ngabe imikhiqizo eseqedile, ngabe ngabe imikhiqizo eqediwe ingabekwa yini esithandweni sokushisa nezinye izindaba.
(6) KwaneleUkukhokhiswa kokugcinakumele alungiswe ukwenzaukwakha ingaphezulubushelelezi nobude nobukhulu obufanele.
Isikhathi esideUkukhokhiswa ShaftLapho ubukhulu bokuqondisa obude bunembe kakhulu, kufanele kulinganiswe ukuthi usayizi wobude buzonwetshwa kancane lapho ugqoka.
IngomaneUkukhokhiswa Shaftekhanda lokusika ukuze uhambisane nezinhlinzeko.