外文原文Optionsformicro-holemakingAsinthemacroscale-machiningworld,holemakingisoneofthemost—ifnotthemost—,dependingontherequiredholediameteranddepth,-coolantdrillsandthosewithoutcoolantholes,plungemilling,-coolantcapabilityisespeciallyhelpfulwhendeep-ofailurewhenexperiencingrecuttingofchips,chippackingandtoomuchexposuretocarbide’sworstenemy—,esstothecuttingaction.“Somewhereabout3to5diametersdeep,thecoolanthastroublegettingdowntothetip,”saidJeffDavis,vicepresidentofengineeringforHarveyToolCo.,Rowley,Mass.“eswisetouseacoolant-feddrillatthatpoint.”Inaddition,floodcoolantcancausemoreharmthangoodwhenmicroholemaking.“Thepressurefromthefloodcoolantcansometimessnapfragiledrillsastheyenterthepart,”-""thatareabletoproduceholesupto12diametersdeep,"".Havingthrough-coolantcapacityisn’tenough,,ataminimum,600to800psiofcoolantpressure.“Itworksmuchbetterifyouhavehigherpressurethanthat,”,,,it’simportanttoselectonewithanincludedangleonitspointthat’sequaltoorlargerthantheincludedangleonthethrough-’,ifthepilotdrillhasa120°includedangleandasmallerdiameterthanathrough-coolantdrillwitha140°includedang
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