MachineTools,Unit3,机床,MachineTools,Themillingmachine,Thelathe,Thegrinder,shaper,MachineTools,Mostofthemechanicaloperationsarecommonlyperformedonfivebasicmachinetools：Thedrillpress;Thelathe;Theshaperorplaner;Themillingmachine;Thegrinder.,DrillingDrillingisperformedwitharotatingtoolcalledadrill.Mostdrillinginmetalisdonewithatwistdrill.Themachineusedfordrillingiscalledadrillpress.Operations,suchasreamingandtapping,arealsoclassifiedasdrilling.Reamingconsistsofremovingasmallamountofmetalfromahol
