V-HO GDR Cobalt High Speed Steel List 1700 - V-HO GDR: Coolant-Through
General Drilling Operations
Low Carbon Steels 1010, 1018
Work Material
Carbon Steels 1045, 1050
Tool Steels D2, H13
Tool Steels H13 (20 HRC)
Cast Iron
Drilling Speed
120-160 SFM
100-140 SFM
83-120 SFM
50-90 SFM
150-200 SFM
Drill Dia.
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Inch Decimal 1/4 0.2500 2,140 0.005-0.007 1,830 0.005-0.007 1,530 0.005-0.007 1,070 0.005-0.007 2,680 0.008-0.010 9/32 0.2813 1,900 0.006-0.008 1,630 0.006-0.008 1,360 0.006-0.008 950 0.006-0.008 2,380 0.008-0.011 5/16 0.3125 1,710 0.007-0.009 1,470 0.007-0.009 1,220 0.007-0.009 860 0.007-0.009 2,140 0.008-0.012 11/32 0.3438 1,560 0.007-0.009 1,330 0.007-0.009 1,110 0.007-0.009 780 0.007-0.009 1,950 0.009-0.013 3/8 0.3750 1,430 0.008-0.011 1,220 0.008-0.011 1,020 0.008-0.011 710 0.008-0.011 1,780 0.010-0.014 13/32 0.4062 1,320 0.008-0.011 1,130 0.008-0.011 940 0.008-0.011 660 0.008-0.011 1,650 0.010-0.014 7/16 0.4375 1,220 0.009-0.012 1,050 0.009-0.012 870 0.009-0.012 610 0.009-0.012 1,530 0.011-0.015 15/32 0.4688 1,140 0.009-0.012 980 0.009-0.012 820 0.009-0.012 570 0.009-0.012 1,430 0.011-0.015 1/2 0.5000 1,070 0.010-0.013 920 0.010-0.013 760 0.010-0.013 540 0.010-0.013 1,340 0.013-0.017 9/16 0.5625 950 0.011-0.014 820 0.011-0.014 680 0.011-0.014 480 0.011-0.014 1,190 0.013-0.017 5/8 0.6250 860 0.012-0.015 730 0.012-0.015 610 0.012-0.015 430 0.011-0.014 1,070 0.014-0.018 11/16 0.6875 780 0.013-0.016 670 0.013-0.016 560 0.013-0.016 390 0.012-0.015 970 0.014-0.018 3/4 0.7500 710 0.014-0.017 610 0.014-0.017 510 0.014-0.017 360 0.013-0.016 890 0.015-0.019 13/16 0.8125 660 0.016-0.021 560 0.016-0.021 470 0.016-0.021 330 0.015-0.020 820 0.017-0.022 7/8 0.8750 610 0.017-0.022 520 0.017-0.022 440 0.017-0.022 310 0.017-0.022 760 0.018-0.023 15/16 0.9375 570 0.018-0.023 490 0.018-0.023 410 0.018-0.023 290 0.018-0.023 710 0.020-0.025 1 1.0000 540 0.019-0.024 460 0.019-0.024 380 0.019-0.024 270 0.019-0.024 670 0.021-0.026 1-1/8 1.1250 480 0.020-0.025 410 0.020-0.025 340 0.020-0.025 240 0.020-0.025 590 0.022-0.027 1-1/4 1.2500 430 0.021-0.026 370 0.021-0.026 310 0.021-0.026 210 0.020-0.025 540 0.023-0.028 1. Speeds and feeds are based on using soluble oil where applicable 1:5 to 1:10 concentration. 2. For deep holes (4 times the drill diameter or deeper) use the lower recommended feed rate as a starting point and increase as needed for the best result. 3. Recommended feeds and speeds are starting points only. Actual performance will be determined by specific material, the condition of equipment being used, and coolant.
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Drilling Technical
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