When to use this calculator
Find axial point length for an ideal drill tip. Ideal conical point geometry, excluding web and tip details.
Explore the machining feeds, speeds & time calculators for other questions in this topic. For a related calculation, use the Drilling Material Removal Rate Calculator: Find nominal drilling removal rate from hole diameter and feed.
PUTTING IT INTO PRACTICE
Drill Point Length: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Drill diameter (mm) | 10 |
| Included point angle (degrees) | 90 |
| Result | 5 mm |
- Check the input labels and enter the example values above.
- Apply the relationship: Point length = diameter/(2 tan(point angle/2)).
- The result is 5 mm, rounded for display.
How to interpret your result
Ideal conical point geometry, excluding web and tip details.
Choose cutting speeds and feeds from suitable tooling and material guidance. These tools translate quantities rather than selecting safe cutting conditions. Effective diameter, engagement, machine limits and setup time need separate attention.
Frequently asked questions
Does the spindle-speed calculation recommend a cutting speed?
No. You supply the cutting speed. The tool converts it and a diameter into revolutions per minute.
When is the drill point length calculator useful?
Find axial point length for an ideal drill tip. Ideal conical point geometry, excluding web and tip details.
How do I use the drill point length calculator?
Enter drill diameter (mm), included point angle (degrees). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Point length = diameter/(2 tan(point angle/2)).
What should I check before using the result?
Ideal conical point geometry, excluding web and tip details.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see Sandvik Coromant: machining formulas and definitions ↗. This is a topic reference, not an external review or endorsement of this tool.
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