V-HO GDR Cobalt High Speed Steel
Titanium Alloy
Hardened Steel
Work Material
Cast Aluminum
30-35 HRC 60-80 SFM
35-45 HRC 30 - 50 SFM
Drilling Speed
250-400 SFM
Drill Dia.
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Speed RPM
Feed IPR
Inch Decimal 1/4
0.2500 4,970 0.013-0.019 1,070 0.005-0.007 640 0.003-0.004 9/32 0.2813 4,420 0.014-0.020 950 0.006-0.008 570 0.004-0.005 5/16 0.3125 3,970 0.015-0.021 860 0.007-0.009 520 0.004-0.005 11/32 0.3438 3,610 0.016-0.022 780 0.007-0.009 470 0.004-0.005 3/8 0.3750 3,310 0.017-0.025 710 0.008-0.011 430 0.005-0.007 13/32 0.4062 3,060 0.018-0.026 660 0.008-0.011 400 0.005-0.007 7/16 0.4375 2,840 0.019-0.027 610 0.009-0.012 370 0.005-0.007 15/32 0.4688 2,650 0.020-0.028 570 0.009-0.012 340 0.005-0.007 1/2 0.5000 2,480 0.021-0.030 540 0.010-0.013 320 0.006-0.008 9/16 0.5625 2,210 0.022-0.031 480 0.011-0.014 290 0.007-0.008 5/8 0.6250 1,990 0.023-0.032 430 0.011-0.014 260 0.007-0.008 11/16 0.6875 1,810 0.024-0.033 390 0.012-0.015 230 0.007-0.009 3/4 0.7500 1,660 0.025-0.034 360 0.013-0.016 220 0.008-0.01 13/16 0.8125 1,530 0.028-0.040 330 0.015-0.020 200 0.009-0.012 7/8 0.8750 1,420 0.030-0.042 310 0.017-0.022 200 0.009-0.012 15/16 0.9375 1,320 0.032-0.044 290 0.018-0.023 200 0.009-0.012 1 1.0000 1,240 0.033-0.045 270 0.019-0.024 200 0.009-0.012 1-1/8 1.1250 1,100 0.034-0.046 240 0.020-0.025 200 0.009-0.012 1-1/4 1.2500 990 0.035-0.047 210 0.020-0.025 200 0.009-0.012
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Drilling Technical
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