Why would you need to adjust the speed of the drill press?

• A. Because you want to save energy
• B. To keep the motor cool
• C. Because different materials have different hardness
• D. To avoid overheating of the drill

Answer: (C)

The main idea is that drilling speed should match how the material behaves when cut. Different materials have different hardness, which affects how easily the drill bit can cut and how much heat is generated. Harder materials resist cutting, so a slower speed helps the bit cut with less heat and wear, producing a cleaner hole. Softer materials can be drilled at higher speeds without as much wear, giving efficient cutting and a good finish.

If you ignore this and drill a hard material at too high a speed, the bit can overheat, dull quickly, or wear unevenly. If you drill a soft material at too low a speed, cutting becomes slow and may cause rubbing or poor surface quality. So, adjusting speed according to material hardness is the best way to balance cutting efficiency, bit life, and hole quality.