How to re-sharpen used drills ?

There’s nothing more frustrating than working on a project and realising your drill bit has gone dull. The cutting edges wear out, making drilling inefficient, slow, and rough. Instead of discarding the bit and rushing to buy a new one, there’s a smarter solution—resharpening. With the right technique and Tools and Cutter Grinding Machines, you can bring your worn-out drills back to life, saving money and ensuring precise drilling every time.

Why Re-Sharpen Your Drills?

Drill bits are an essential part of any toolbox, whether you're a DIY enthusiast, a machinist, or an industrial professional. However, constant use leads to wear, reducing cutting efficiency and accuracy. Re-sharpening used drills is an economical and environmentally friendly way to extend their lifespan. Plus, sharp drill bits improve productivity, reduce effort, and provide cleaner results.

Recognising a Dull Drill Bit

Before we dive into the sharpening process, it's crucial to recognize when a drill bit needs attention. Here are some signs:

Increased drilling time and pressure needed to penetrate material

Overheating, causing the bit to discolor

Rough, uneven holes

High-pitched screeching noise while drilling

If your drill bit exhibits any of these symptoms, it’s time to sharpen it!

The Solution: Tool and Cutter Grinding Machines

The most effective way to sharpen drill bits is by using Grinding Machines, specifically designed for precision sharpening. These machines restore the cutting edges of a drill bit to their optimal sharpness, ensuring efficiency and longevity.

Types of Grinding Machines for Drill Sharpening

Tool and Cutter Grinding Machines –

Designed for sharpening various cutting tools, including drill bits, milling cutters, and reamers. These machines offer high precision and adjustable settings for different angles.

Drill Grinding Machines –

Specifically built to sharpen drill bits, ensuring they regain their sharp cutting edges with precise geometry.

Bench Grinders –

A more common and cost-effective method, often used in workshops for quick sharpening. While not as precise as dedicated drill grinders, they work well for general sharpening needs.

 

Step-by-Step Guide to Sharpening a Drill Bit

 

1. Choose the Right Grinding Machine

Select a Tool and Cutter Grinding Machine or a Drill Grinding Machine for precision sharpening. If using a bench grinder, ensure you have a fine-grit wheel.

2. Secure the Drill Bit

Clamp the drill bit properly in the machine’s chuck or guide to maintain stability. If using a manual bench grinder, hold the bit firmly at the correct angle.

3. Identify the Correct Angle

Most drill bits require sharpening at a 118-degree or 135-degree angle, depending on the type. Adjust the machine settings accordingly.

4. Grind the Cutting Edge

Gently touch the drill bit to the grinding wheel, ensuring even pressure and smooth movement. Rotate the bit slightly to maintain a symmetrical edge.

5. Check for Sharpness

After grinding, examine the bit to ensure both cutting edges are uniform. A properly sharpened bit should have a smooth, even edge.

6. Cool and Test the Drill Bit

Dip the bit in water to cool it down and prevent overheating. Test the sharpened bit on a scrap material to check its performance.

Tips for Effective Drill Bit Sharpening

• Always wear safety goggles and gloves while sharpening.
• Avoid excessive pressure to prevent uneven grinding.
• Regularly clean and maintain your Grinding Machines for precise results.
• Mark dull bits to ensure they are sharpened before use.

Final Thoughts

Resharpening your drill bits using Tool and Cutter Grinding Machines or Drill Grinding Machines is a practical skill that saves money and improves work efficiency. With the right tools and techniques, you can restore worn-out drill bits to their original precision, ensuring smooth and effortless drilling. Next time your drill bit dulls, don’t toss it—resharpen it and keep your projects running seamlessly!