Home
Back
Drill Tip Length Formula:
| From: | To: |
The drill tip length calculation determines the length of the tapered tip of a drill bit based on its diameter and point angle. This measurement is important for precision drilling applications, especially in concrete and masonry work.
The calculator uses the trigonometric formula:
Where:
Explanation: The formula calculates the length of the conical tip based on the drill's geometry, using trigonometric relationships between the diameter, angle, and resulting tip length.
Details: Accurate tip length calculation is crucial for determining drilling depth requirements, ensuring proper hole depth for anchors, and selecting appropriate drill bits for specific applications in concrete and masonry work.
Tips: Enter the drill bit diameter in millimeters and the point angle in degrees. Common drill point angles are 118° for general purpose, 135° for hard materials, and 90° for masonry bits.
Q1: Why is drill tip length important in concrete drilling?
A: The tip length affects how deep you need to drill to achieve the desired effective hole depth, as the tapered tip doesn't create a full-diameter hole until it's completely embedded.
Q2: What are common drill point angles for concrete?
A: Masonry drill bits typically have a 90° or 130° point angle. Carbide-tipped concrete bits usually have a 130° angle for better penetration.
Q3: Does this calculation work for all drill bit types?
A: This formula works best for standard conical drill points. Specialized drill geometries (like spade bits, Forstner bits, or step drills) require different calculations.
Q4: How does tip length affect drilling depth?
A: When drilling, you must account for the tip length to achieve the desired effective depth. The total drilling depth should be the desired depth plus the tip length.
Q5: Can I use this for drill bit sharpening?
A: Yes, understanding the tip geometry is important for proper drill bit sharpening to maintain the original cutting characteristics.