1. What is Drill Point Angle Depth?

The drill point angle depth, also known as center core depth, is the distance from the drill tip to the theoretical intersection point of the cutting edges. This measurement is crucial for proper drill geometry and performance.

2. How Does the Calculator Work?

The calculator uses the drill point depth formula:

Where:

• \( Drill\ Dia \) — Drill diameter in millimeters
• \( Angle \) — Drill point angle in degrees
• \( Depth \) — Center core depth in millimeters

Explanation: The formula calculates the depth of the center core based on the drill diameter and the included angle of the drill point.

3. Importance of Drill Point Depth Calculation

Details: Accurate drill point depth calculation is essential for proper drill geometry, chip removal, cutting efficiency, and hole quality. It affects drill life and performance.

4. Using the Calculator

Tips: Enter drill diameter in millimeters and drill point angle in degrees. Common drill point angles are 118°, 135°, and 140°. All values must be valid (diameter > 0, angle between 0-180°).

5. Frequently Asked Questions (FAQ)

Q1: What is the most common drill point angle?
A: 118° is the standard point angle for general purpose drilling in most materials.

Q2: Why are different point angles used?
A: Different angles are optimized for different materials: 90° for soft materials, 118° for general purpose, 135° for hard materials, and 140° for stainless steel.

Q3: How does point angle affect drilling?
A: Smaller angles provide better centering but weaker cutting edges, while larger angles are stronger but may wander more.

Q4: What is the purpose of the center core?
A: The center core (web) provides structural strength to the drill and helps in proper chip formation and removal.

Q5: Can this calculator be used for specialized drills?
A: This calculator is designed for standard twist drills. Specialized drills like split-point or carbide drills may have different geometries.