twist drill
A twist drill chishandiso chinoboora gomba redenderedzwa muchinhu chebasa kuburikidza nekucheka kutenderera kune axis yakagadziriswa.Inopihwa zita nekuti chip chinyere chayo chakaita denderedzwa uye chinoratidzika sechimoko.Spiral grooves inogona kuva ne2, 3 kana kupfuura grooves, asi 2 grooves ndiyo yakawanda.Twist drills inogona kusungirirwa pamaturusi emaoko kana emagetsi anobatwa nemaoko kana kushandiswa pamichina yekudhirowa, michina yekugaya, lathes uye kunyange machining nzvimbo.Drill bit materials anowanzo ari high-speed tool simbi kana carbide.