Drill Speed | Drilling Metal | |
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The best speed to use in any drill press operation is determined by; material, size of drill bit, type of drill bit or cutter and quality of cut desired. The smaller the drill bit, the greater the speed. In soft materials, the speed should be higher than for hard materials. Refer to the chart below.
When drilling metal, use clamps to hold the work- piece securely in place. The workpiece should never be held in place by bare hands. The cutting edge can catch in the material at any time, result- ing in serious injury. Any movement of the work- piece during the drilling operation may result in a rough or misplaced hole and increase the chance of drill bit breakage.
For flat work, lay the workpiece on a wooden base and clamp it firmly to the table. Use a V- block and clamp for round stock. A drill press vise with prismatic jaws can also be used to hold flat or round material.
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| Recommended RPM |
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Drill | Cast |
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Diameter | Iron | Steel | Aluminum | Wood |
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1⁄8" | 1900 | 2620 | 2620 | 2620 |
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3⁄16" | 1550 | 1620 | 2620 | 2620 |
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1⁄4" | 990 | 1350 | 1550 | 2620 |
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5⁄16" | 650 | 990 | 1550 | 1550 |
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3⁄8" | 600 | 990 | 990 | 1550 |
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7⁄16" | 510 | 650 | 990 | 990 |
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1⁄2" | 510 | 650 | 650 | 990 |
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9⁄16" | 390 | 600 | 650 | 990 |
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5⁄8" | 390 | 510 | 510 | 650 |
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3⁄4" | 340 | 390 | 510 | 350 |
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7⁄8" | 250 | 340 | 390 | 510 |
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1" | — | 340 | 390 | 510 |
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11⁄8" | — | 250 | 340 | 390 |
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11⁄4" | — | — | 340 | 390 |
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G4008/G4009 Drill Press |
