
USER GUIDE GUNDRILLS Gundrill Recommended Machining Conditions Tensile Material Cutting Feed (mm/rev) vs. Drill Diameter (mm) Strength Hardness Group Speed vc ISO 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 and Quenched < 0.55 %C 850 250 3 70-100 cast steel, and tempered 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 Quenched 1000 300 5 70-90 and tempered Annealed 600 200 6 80-110 P Low alloy and cast 930 275 7 70-110 steel (less than 5% of Quenched 0.01-0.03 0.03-0.05 0.035-0.06 0.04-0.07 0.02-0.10 alloying elements) 1000 300 8 60-90 and tempered 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 Quenched 1100 325 11 and tempered Ferritic/ 40-70 0.01-0.03 0.025-0.04 0.03-0.045 0.035-0.05 0.12-0.10 Stainless steel 680 200 12 martensitic and cast steel Martensitic 820 240 13 Stainless steel Austenitic, M 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 and cast steel duplex Ferritic/ 180 15 70-100 pearlitic Grey cast iron (GG) Pearlitic/ 260 16 70-100 martensitic 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 Not 60 21 Aluminum-wrought alloys hardenable Hardenable 100 22 80-160 Not <=12% Si 75 23 0.02-0.04 0.03-0.17 0.03-0.18 0.035-0.19 0.03-0.15 hardenable Aluminum- Hardenable 90 24 cast alloys High >12% Si 130 25 80-120 N temperature >1% Pb Free cutting 110 26 Copper Brass 90 27 alloys Electrolitic 100 28 copper 80-180 0.02-0.04 0.02-0.13 0.03-0.16 0.04-0.18 0.03-0.15 Duroplastics, 29 Non-metallic fiber plastics Hard rubber 30 Annealed 200 31 Fe based Hardened 280 32 High temp. Annealed 250 33 alloys Ni or Co Hardened 350 34 based S Cast 320 35 25-60 0.01-0.03 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