1. What is Spot Drill Depth?

Spot drill depth is the required depth to drill to achieve a specific diameter with a given spot drill angle and tip diameter. It's crucial for creating accurate starter holes for subsequent drilling operations.

2. How Does the Calculator Work?

The calculator uses the spot drill depth formula:

Where:

• \( Diameter \) — Desired hole diameter (in)
• \( Tip\ Diameter \) — Diameter of the spot drill's tip (in)
• \( Angle \) — Included angle of the spot drill (degrees)

Explanation: The formula calculates the depth needed for the spot drill to create the desired diameter based on its geometry.

3. Importance of Spot Drill Depth Calculation

Details: Accurate spot drill depth ensures proper hole starting location, prevents drill walking, and creates the correct chamfer for subsequent drilling operations.

4. Using the Calculator

Tips: Enter diameter and tip diameter in inches, angle in degrees. All values must be valid (diameter > tip diameter, angle between 0-180°).

5. Frequently Asked Questions (FAQ)

Q1: Why is spot drill depth important?
A: Proper depth ensures accurate hole placement and prevents drill bit wandering during subsequent drilling operations.

Q2: What's a typical spot drill angle?
A: Common angles are 90°, 120°, and 140°, with 90° being most common for general purpose drilling.

Q3: What if my spot drill has no tip diameter (sharp point)?
A: Use 0 for tip diameter in the calculator.

Q4: How precise should my depth measurement be?
A: For most applications, ±0.005" is sufficient, but precision work may require tighter tolerances.

Q5: Can I use this for countersink depth calculation?
A: Yes, the same formula applies to countersinks, though the angle is typically different (often 82° or 100°).