Ukucubungula ngomjovo weplastiki kuvamile kakhulu embonini yokucubungula umlomo wombhobho. Okokuqala, kushibhile futhi izindleko eziphansi zenza lolu hlobo lombhobho luthandwe kakhulu. Okwesibili ukuvumelana komkhiqizo. Uma kuqhathaniswa machining umlomo wombhobho wensimbi, umjovo udini umlomo wombhobhoUkufana okuphezulu, lokhu kungenxa yenqubo yokucubungula insimbi, noma iziphi izingozi ezincane zingadala ukuthi ukusebenza kombhobho kushintshe (njengokufakwa kwethuluzi enqubweni yokujika, ukupholisa okunganele, njll., ngakho-ke umlomo wombhobho wensimbi udinga ukuba ihlolwe njalo ukuqinisekisa ukuthi ukusebenza komkhiqizo kuzinzile). Umjovo udini ayinazo izidingo eziphakeme kangaka. Uma nje isikhunta sinobuqotho, ingcindezi nokushisa kuyahambisana, futhi isikhathi sokupholisa sihambisana, ukusebenza komkhiqizo owenziwe kufana futhi kuzinzile kakhulu.

Enye inzuzo yepulasitiki umjovo udini umlomo wombhobhos ukuthi ngemibhobho enezimo eziyinkimbinkimbi, imishini yensimbi ivame ukudinga izindleko eziphezulu zokukhiqiza, kuyilapho imijovo yokubumba umjovo wepulasitiki ingenayo le nkinga. Izindleko zesikhunta ziphakeme, kepha zisatshalaliswa ngokulinganayo kulowo nalowo Lapho kwenziwa imibhobho, intengo izobe iphansi kakhulu, nayo enquma ukuthi lapho ukukhiqizwa okukhulu, le ndlela inganciphisa ngempumelelo izindleko zokukhiqiza. Ngokukhiqizwa kwe-batch encane, ukucubungula ngemishini kufaneleka kakhulu.