|
Reference |
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 | 1070 | 1.0 | 1220 | 0.9 | 1530 | 1.3 | 4890 | 8.7 | 2445 | 6.8 |
| .6562 | 425 | 2620 | 2.3 | 1745 | 1.8 | 1020 | 1.0 | 1165 | 0.9 | 1455 | 1.3 | 4655 | 8.6 | 2330 | 6.7 |
| .6875 | 425 | 2500 | 2.2 | 1665 | 1.7 | 970 | 1.0 | 1110 | 0.9 | 1390 | 1.3 | 4445 | 8.5 | 2220 | 6.6 |
| .7187 | 400 | 2390 | 2.2 | 1595 | 1.7 | 930 | 1.0 | 1060 | 0.8 | 1330 | 1.2 | 4250 | 8.3 | 2125 | 6.5 |
| .7500 | 400 | 2290 | 2.2 | 1530 | 1.7 | 890 | 1.0 | 1029 | 0.8 | 1275 | 1.2 | 4075 | 8.2 | 2040 | 6.4 |
Note: These speeds and feeds are suggested starting points only and may be changed to suit material and machine characteristics.