Umphongolo wesikulufa esiwukhiqizayo wenziwe ngokuqinile ngensimbi yezinga eliphezulu yengxubevange futhi wenziwe ngokucophelela ngobuchwepheshe bakamuva nokucubungula nokuhlola ukuze uqinisekise ukunemba kanye nekhwalithi yendlela yokuphila nende ukukhiqizwa nesikhathi sokuphila nende.
I-screw barrel esiyikhiqizayo yenziwe ngokuqinile ngensimbi ye-alloy yekhwalithi ephezulu futhi yenziwe ngokucophelela ngobuchwepheshe benqubo yakamuva kanye nemishini yokucubungula nokuhlola ukuze kuqinisekiswe ukunemba kanye nekhwalithi yokukhiqiza, futhi inempilo ende yesevisi nokuguga okuhle nokumelana nokugqwala.
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