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Suggested Speeds and Feeds

Gun Drill Diameter Cutting Fluid Pressure Low & Medium Carbide Steel to 240 BHN Alloy Steel to 240 BHN Tool Steel to 200 BHN 300 Stainless Steel to 200 BHN 400 Stainless
Steel to 200 BHN
Aluminum, low to medium Silicon Gray Cast Iron to 180 BHN
Inches P.S.I. RPM IPM RPM IPM RPM IPM RPM IPM RPM IPM RPM IPM RPM IPM
.0781 1500 10000 1.4 10000 1.6 8650 1.3 9780 1.2 10000 1.4 10000 2.5 10000 3.6
.0937 1500 10000 1.8 10000 2.0 7135 1.4 8150 1.3 10000 1.8 10000 3.3 10000 4.9
.1250 1500 10000 2.4 9165 2.5 5345 1.5 6110 1.3 7640 1.8 10000 4.8 10000 7.1
.1562 1300 10000 3.0 7335 2.5 4280 1.5 4890 1.3 6115 1.8 10000 6.0 9870 8.9
.1875 1150 9170 3.2 6110 2.5 3565 1.4 4075 1.3 5090 1.8 10000 7.1 8150 8.9
.2187 1050 7860 3.1 5240 2.4 3055 1.4 3490 1.2 4360 1.7 10000 8.2 6985 8.8
.2500 925 6875 3.1 4585 2.4 2675 1.4 3055 1.2 3820 1.7 10000 9.1 6110 8.6
.2812 850 6110 3.0 4075 2.3 2375 1.3 2715 1.1 3395 1.7 10000 10.1 5435 8.4
.3125 775 5500 2.9 3665 2.2 2140 1.3 2445 1.1 3055 1.6 9780 10.7 4890 8.3
.3437 725 5000 2.8 3335 2.2 1945 1.3 2220 1.1 2780 1.6 8890 10.4 4445 8.1
.3750 675 4585 2.8 3055 2.1 1780 1.2 2040 1.1 2545 1.5 8150 10.2 4075 7.9
.4062 625 4230 2.7 2820 2.1 1645 1.2 1880 1.0 2350 1.5 7520 10.0 3760 7.8
.4375 600 3930 2.6 2620 2.0 1530 1.2 1745 1.0 2180 1.5 6895 9.8 3490 7.6
.4687 550 3670 2.6 2445 2.0 1425 1.2 1630 1.0 2035 1.4 6520 9.6 3260 7.5
.5000 525 3440 2.5 2290 1.9 1335 1.1 1530 1.0 1910 1.4 6110 9.4 3055 7.3
.5312 500 3235 2.5 2155 1.9 1260 1.1 1440 0.9 1800 1.4 5750 9.2 2875 7.2
.5625 500 3055 2.4 2035 1.9 1190 1.1 1360 0.9 1700 1.3 5430 9.0 2715 7.1
.5937 475 2895 2.4 1930 1.8 1125 1.1 1290 0.9 1610 1.3 5145 8.9 2575 6.9
.6250 450 2750 2.3 1835 1.8