Impahla yomshini wokubhoboza isikhungo ingahlukaniswa ngensimbi enesivinini esikhulu, i-carbide enosimende, i-ceramics ne-polycrystalline diamond.Phakathi kwazo, insimbi enesivinini esikhulu iyinto evame ukusetshenziswa ngokusebenza kwezindleko eziphezulu;i-carbide enosimende inokumelana okuhle nokuqina, futhi ifanele ukucubungula izinto ezinobunzima obuphakeme kakhulu;I-ceramic center drill inokumelana okuhle kokushisa okuphezulu nokumelana nokugqoka, kodwa ukucubungula Ukusebenza kahle kuphansi;i-polycrystalline diamond center drill inobulukhuni obuphezulu kakhulu nokumelana nokugqoka, futhi ifanele ukucubungula izinto ezinobulukhuni obuphezulu.Uma ukhetha izinto zokumba isikhungo, kufanele kukhethwe ngokuvumelana nobunzima bezinto zokusebenza kanye nezimo zokucubungula.Ngokuvamile, ngezinto zensimbi eziqinile, ungakhetha izinto eziqinile, njenge-carbide enosimende, idayimane le-polycrystalline, njll.;ngezinto ezithambile, ungakhetha insimbi enesivinini esikhulu noma izitsha zobumba.Ukwengeza, kuyadingeka futhi ukunaka izici ezifana nobukhulu kanye nekhwalithi yendawo yokubhoboza isikhungo ukuze kuqinisekiswe umphumela wokucubungula nokunemba kokucubungula.Uma usebenzisa i-center drill, kufanele kuqashelwe ekucubunguleni izimo zokuthambisa nezipholile ukuze kugwenywe ukuguga kwamathuluzi kanye nokuncipha kwekhwalithi yendawo ngenxa yokucubungula ngokweqile.Ngesikhathi esifanayo, kufanele futhi sinake ukuphepha ngesikhathi sokucubungula ukuze sigweme ukungazinzi kwe-workpiece noma ukucubungula izingozi ezibangelwa ukunemba okuphansi kokucubungula.