Accessories for Drilling machines, Machine Shop Accessories, Tools & Instruments
Centre Drill Bit
Tag: Popular Tools
₹1,500
Center Drill bit for drilling components that require machining between centers. Has a 120 & deg point angle with a 60 ° included countersink.
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:
- 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.
- 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.
- 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.
- 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.
- 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:
- 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.
- Sizes:
- Variety: Center drill bits come in various sizes and configurations, typically designated by number or letter gauges.
- 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:
- Mount the Bit:
- Securely: Mount the center drill bit in the drill chuck or collet of your machine, ensuring it is securely held.
- Position the Workpiece:
- Align: Place the workpiece on the machine bed or lathe, aligning it properly to ensure accurate drilling.
- 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.
- 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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