The drill tip length calculator helps determine the precise length of a drill bit’s tip, which is crucial for achieving accurate hole depths in various materials.
This calculator takes into account factors such as the drill point angle and drill diameter to compute the tip length.
Consider a drill bit with a 118-degree point angle and a 10mm diameter. Using the calculator, you might find that the tip length is approximately 2.8mm. This information is vital when you need to drill a hole to a specific depth, as you must account for the tip length in your measurements.
Drill Tip Length Calculator
| Drill Diameter (mm) | Point Angle (°) | Calculated Tip Length (mm) |
|---|---|---|
| 5 | 118 | 1.40 |
| 8 | 135 | 1.66 |
| 10 | 90 | 5.00 |
| 12.5 | 120 | 3.61 |
| 15 | 140 | 2.82 |
| 3 | 118 | 0.84 |
| 4 | 135 | 0.83 |
| 6 | 90 | 3.00 |
| 7 | 118 | 2.10 |
| 9 | 135 | 1.86 |
| 11 | 120 | 3.14 |
| 13 | 135 | 2.94 |
| 14 | 90 | 4.00 |
| 16 | 118 | 4.80 |
| 18 | 135 | 4.30 |
Drill Tip Length Formula
The formula used in the drill tip length is derived from trigonometric principles. It’s expressed as:
Tip Length = (Drill Diameter / 2) / tan(Point Angle / 2)- Drill Diameter: The width of the drill bit, measured across its widest point.
- Point Angle: The angle formed at the tip of the drill bit, typically 118° for general-purpose bits.
- tan: The tangent trigonometric function.
For a practical example, let’s calculate the tip length for a drill bit with a 12mm diameter and a 135° point angle:
- Convert the angle to radians: 135° ÷ 2 = 67.5°
- Calculate tan(67.5°) ≈ 2.4142
- Divide (12mm / 2) by 2.4142
- Tip Length ≈ 2.49mm
Drill Tip Length Chart
Below is a tabular chart showing typical drill tip lengths for various diameters and point angles:
| Drill Diameter (mm) | 118° Point Angle (mm) | 135° Point Angle (mm) |
|---|---|---|
| 3 | 0.84 | 0.62 |
| 6 | 1.68 | 1.24 |
| 9 | 2.52 | 1.86 |
| 12 | 3.36 | 2.49 |
| 15 | 4.20 | 3.11 |
How to Calculate Tip Length of Drill?
To calculate the tip length of a drill, follow these steps:
Measure the drill diameter using calipers or a micrometer.
Identify the point angle of the drill bit (usually stamped on the shank or packaging).
Apply the formula: Tip Length = (Drill Diameter / 2) / tan(Point Angle / 2)
Let’s calculate the tip length of a 7mm drill bit with a 118° point angle:
- Diameter = 7mm
- Point Angle = 118°
- Tip Length = (7 / 2) / tan(118 / 2)
- = 3.5 / tan(59)
- = 3.5 / 1.664
- ≈ 2.10mm
How Long is a Drill Tip?
The length of a drill tip varies depending on the bit’s diameter and point angle. Drill tips range from less than 1mm for small bits to over 5mm for larger ones.
The point angle also plays a significant role; a sharper angle (smaller degree) results in a longer tip, while a flatter angle (larger degree) creates a shorter tip.
For example:
- A 4mm drill bit with a 118° point angle has a tip length of about 1.12mm.
- The same 4mm bit with a 135° point angle would have a shorter tip of approximately 0.83mm.
References:
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