GUNDRILLS ISO USER GUIDE Gundrill Recommended Machining Conditions Tensile Material CuttingStrengthHardnessGroupSpeed vcFeed (mm/rev) vs. Drill Diameter (mm) Material Condition [N/mm2] HB No.(1) m/min 2.0-9.79 9.8-11.69 11.7-13.19 13.2-16.19 16.2-40 < 0.25 %C Annealed 420 125 1 70-110 Non-alloy >= 0.25 %C Annealed 650 190 2 80-110 steel andcast steel,< 0.55 %C Quenchedand tempered 850 250 3 70-100 0.01-0.03 0.03-0.05 0.035-0.06 0.04-0.07 0.02-0.10 free cutting >= 0.55 %C Annealed 750 220 4 70-110 steel Quenchedand tempered 1000 300 5 70-90 Annealed 600 200 6 80-110 P Low alloy and cast 930 275 7 70-110 steel (less than 5% ofalloying elements)Quenchedand tempered1000300 0.01-0.03 0.03-0.05 0.035-0.06 0.04-0.07 0.02-0.10860-90 1200 350 9 50-80 Annealed 680 200 10 50-70 0.01-0.03 0.025-0.04 0.03-0.045 0.035-0.05 0.12-0.10 High alloyed steel, cast steel and tool steel Quenchedand tempered 1100 325 11 Stainless steel Ferritic/martensitic 680 200 12 40-70 0.01-0.03 0.025-0.04 0.03-0.045 0.035-0.05 0.12-0.10 and cast steel Martensitic 820 240 13 M Stainless steeland cast steel Austenitic,duplex 600 180 14 40-80 0.01-0.03 0.025-0.04 0.03-0.045 0.035-0.05 0.02-0.10 Ferritic/Grey cast iron (GG)pearliticPearlitic/martensitic1801570-1002601670-100 K Ferritic 160 17 80-110 0.01-0.40 0.04-0.1 0.05-0.12 0.06-0.14 0.05-0.20 Nodular cast iron (GGG) Pearlitic 250 18 80-110 Ferritic 130 19 90-115 Malleable cast iron Pearlitic 230 20 90-115 NotAluminum-wrought alloyshardenable60 21 Hardenable 100 22 <=12% Si Nothardenable 80-16075230.02-0.040.03-0.17 0.03-0.18 0.035-0.19 0.03-0.15 Aluminum-cast alloys Hardenable 90 24 N >12% Si Hightemperature 130 25 80-120 >1% Pb Free cutting 110 26 Copper Brass 90 27 alloys Electroliticcopper 100 28 80-180 0.02-0.04 0.02-0.13 0.03-0.16 0.04-0.18 0.03-0.15 Duroplastics,Non-metallicfiber plastics 29 Hard rubber 30 Annealed 200 31 Fe based Hardened 280 32 High temp.alloysS Ni or CobasedAnnealedHardenedCast 250 33350343203525-600.01-0.03 0.025-0.03 0.03-0.035 0.03-0.04 0.02-0.10 Pure 400 36 Titanium alloys Alpha+beta alloys 1050 37 hardened Hardened 55 HRC 38 20-50 0.025-0.03 0.03-0.035 0.03-0.04 Hardened steel Hardened 60 HRC 39 H 0.01-0.03 0.02-0.10 Chilled cast iron Cast 400 40 Cast iron Hardened 55 HRC 41 (1) For workpiece materials list, see pages 495-524 310 ISCAR