Centre Drill Bit

Pack size: 3 drill bits

1) B54

• Body diameter: 4mm
• Length: 32.45mm
• Bit diameter: 1.18mm

2) B55

• Body diameter: 4.95mm
• Length: 38.6mm
• Bit diameter: 1.77mm

3) B56

• Body diameter: 8mm
• Length: 47mm
• Bit diameter: 2.47mm

A center drill bit, also known as a center drill or a center punch drill, is a specialized tool used primarily in metalworking and machining. Its primary function is to create a precise, conical hole or indentation in the surface of a workpiece. Here’s a more detailed look at its uses and applications:

Uses of a Center Drill Bit:

1. Creating Center Holes:
   • Purpose: The main purpose of a center drill bit is to create a small, accurately located center hole. This hole serves as a guide for subsequent drilling operations, especially when working with a lathe.
   • Benefit: This helps in aligning the workpiece and ensuring that the drill bit drills straight and true.
2. Preventing Bit Wander:
   • Purpose: When drilling large holes, especially in metal, a center drill helps prevent the larger drill bit from wandering off center.
   • Benefit: This is crucial for maintaining precision and accuracy in the final hole.
3. Starting Holes for Tapping:
   • Purpose: A center drill bit can be used to create a small, accurate hole before tapping for threads.
   • Benefit: This ensures that the tap starts correctly and threads are cut accurately.
4. Preparing for Further Machining:
   • Purpose: Center drills are often used as a preliminary step before performing other machining operations like boring or turning.
   • Benefit: This initial hole provides a reference point for further machining.
5. Creating Pilot Holes:
   • Purpose: In some cases, a center drill bit can be used to create pilot holes for larger drills or cutting tools.
   • Benefit: This helps guide the larger drill and reduces the risk of drilling errors.

Characteristics of Center Drill Bits:

1. Design:
   • Tip: The tip of a center drill bit is usually conical and has two cutting edges that allow it to drill a small, accurate hole.
   • Body: It often has a smaller diameter shank that fits into the drill chuck and a larger diameter body that supports the cutting edges.
2. Sizes:
   • Variety: Center drill bits come in various sizes and configurations, typically designated by number or letter gauges.
3. Materials:
   • Construction: They are usually made from high-speed steel (HSS) or carbide to handle the hardness of metal and other materials.

How to Use a Center Drill Bit:

1. Mount the Bit:
   • Securely: Mount the center drill bit in the drill chuck or collet of your machine, ensuring it is securely held.
2. Position the Workpiece:
   • Align: Place the workpiece on the machine bed or lathe, aligning it properly to ensure accurate drilling.
3. Drill the Center Hole:
   • Start: Begin drilling at a slow speed, applying steady pressure. The center drill will cut into the material and create a precise center hole.
4. Check the Hole:
   • Verify: After drilling, check the center hole for accuracy and alignment before proceeding with further machining.

Using a center drill bit effectively can significantly enhance the precision and quality of your machining projects.