Official Answer
Answer
Shigarwa mai sarrafa kansa yana buƙatar madaidaicin madauri da kuma ma'auni. Diamita na tushe na mandrel yakamata yayi daidai da diamita na shaft, kuma kusurwar taper ya kamata ya zama mara zurfi (yawanci $ 3°$-$5°$) don rage ƙarfin da ake buƙata da damuwa akan zoben. Ana tura zoben sama da taper, yana faɗaɗa shi a hankali. Dole ne a taurare saman mandrel (HRC $60+$) kuma a goge shi zuwa ƙarshen madubi don hana galling ID ɗin zobe. Idan mandrel ya yi tsayi da yawa, zoben na iya 'juya' ko kuma a sami fa'ida marar daidaituwa, wanda zai haifar da nakasu na dindindin ko 'screwing cork,' inda jujjuyawar zoben juyi da yawa ke rabuwa har abada.
