1. What is Drill Point Depth?

Drill point depth is the measurement from the tip of a drill bit to the point where the full diameter begins. It's crucial for determining how deep to drill to achieve a specific hole depth and for proper drill bit selection.

2. How Does the Calculator Work?

The calculator uses the drill point depth formula:

Where:

• \( Diameter \) — Drill bit diameter (inches)
• \( Angle \) — Point angle of the drill bit (degrees)
• \( \tan \) — Tangent trigonometric function

Explanation: The formula calculates the length of the conical tip based on the drill's diameter and point angle.

3. Importance of Drill Point Depth Calculation

Details: Accurate drill point depth calculation ensures proper hole depth, prevents drill breakage, and helps in selecting the correct drill bit length for specific applications.

4. Using the Calculator

Tips: Enter the drill bit diameter in inches and the point angle in degrees. Common point angles are 118° (general purpose) and 135° (harder materials).

5. Frequently Asked Questions (FAQ)

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

Q2: How does point angle affect drilling?
A: Smaller angles (90-118°) are better for softer materials, while larger angles (120-140°) are better for harder materials.

Q3: Why is drill point depth important?
A: It affects the actual hole depth and must be accounted for when precise depth control is needed.

Q4: Does this work for all drill bit types?
A: This applies to standard twist drills. Special drill bits (like brad point or Forstner) have different geometries.

Q5: How accurate is this calculation?
A: It's mathematically precise for perfect conical points. Actual drill bits may have slight variations.