D Drill diameter Shank diameter GradeInsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex User’s Guide - Technical Reference A Drilling To o l s Nomenclature for Indexable drill B Overall length Central insert Maximum drilling depth Shank lengthFlange diameterShank C D Peripheral insert Peripheral insert Central insert Flute FlangePeripheral insert E F Cutting zone of Cutting zone of central edge peripheral edge G Calculation formulas for Indexable drill ᭹Cutting speed ᭹When calculating cutting speed from number of revolutions:(Drilling formulas) H vc : Cutting speed (m/min) D D : Drill diameter (mm)〔DC〕 n : Number of revolution (min-1)π53.14᭹When calculating required number of revolutions from cuttingI speed: (Drilling formulas) D J D ᭹When calculating cutting speed from number of revolutions: (Where the workpiece rotates.) vc : Cutting speed (m/min) D D : Drilling diameter (mm)〔DC〕n: Number of revolution (min-1)π53.14K ᭹When calculating required number of revolutions from cutting speed: (Where the workpiece rotates.) D L ᭹Calculation of feed speed vf: Feed speed (mm/min)f : Feed (mm/rev)n : Number of revolution (min-1)M 〔 〕The notation in the brackets is the one used in the catalog (ISO compliant) Tungaloy L075