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Centre Drill Bit
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Centre Drill Bit

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₹1,500

Center Drill bit for drilling components that require machining between centers. Has a 120 & deg point angle with a 60 ° included countersink.

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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.

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