Drill Tip Depth Calculator

Drill Tip Depth Formula:

\[ Tip\ Depth = \frac{Drill\ Diameter}{2} \times \tan\left(\frac{Point\ Angle}{2}\right) \]

Tip Depth:

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1. What is Drill Tip Depth?

Drill tip depth refers to the vertical distance from the tip of a drill bit to the point where the full diameter begins. This measurement is crucial for determining the exact drilling depth required to achieve desired hole dimensions, especially in precision machining and drilling applications.

2. How Does the Calculator Work?

The calculator uses the standard drill tip depth formula:

\[ Tip\ Depth = \frac{Drill\ Diameter}{2} \times \tan\left(\frac{Point\ Angle}{2}\right) \]

Where:

\( Drill\ Diameter \) — The diameter of the drill bit in millimeters
\( Point\ Angle \) — The included angle of the drill point in degrees
\( \tan \) — Trigonometric tangent function

Explanation: The formula calculates the vertical depth of the drill point based on the drill's diameter and the point angle geometry.

3. Importance of Tip Depth Calculation

Details: Accurate tip depth calculation is essential for precision drilling operations, ensuring proper hole depth, avoiding material damage, and achieving desired thread engagement in tapping operations.

4. Using the Calculator

Tips: Enter drill diameter in millimeters and point angle in degrees. The standard drill point angle is 118°, but specialized drills may use different angles (90°, 135°, etc.). All values must be positive and point angle should be between 0-180 degrees.

5. Frequently Asked Questions (FAQ)

Q1: Why is 118° the standard point angle?
A: 118° provides a good balance between cutting efficiency, point strength, and self-centering capability for most general-purpose drilling applications.

Q2: When would I use different point angles?
A: Different materials require different point angles: softer materials (90°-118°), harder materials (118°-135°), and specialized applications like center drills (60°).

Q3: How does tip depth affect drilling operations?
A: Tip depth determines how much extra depth you need to drill to achieve the desired through-hole or blind-hole depth, accounting for the conical tip geometry.

Q4: Can I use this calculator for metric and imperial units?
A: This calculator uses millimeters for diameter and output. For imperial units, convert inches to millimeters (1 inch = 25.4 mm) before calculation.

Q5: Is tip depth the same for all drill types?
A: No, specialized drills like brad-point, split-point, or carbide drills may have different tip geometries that affect the tip depth calculation.