Drill Tip Length Calculator

Calculate the effective drill tip length based on drill diameter, shank length, and shoulder diameter.

Input Parameters

Calculation Results

Calculation Formula

Tip Length = Shank Length - (Shoulder Diameter - Drill Diameter)/2

Where:
Tip Length: Effective cutting length of the drill tip
Shank Length: Total length of the drill shank
Shoulder Diameter: Diameter at the shoulder junction
Drill Diameter: Cutting diameter of the drill bit

Drill Tip Length Calculator Calculator Usage Guide

Learn how to use the Drill Tip Length Calculator and its working principles

How to Use the Calculator

  1. Enter the Drill Diameter (the cutting diameter of your drill bit in millimeters).
  2. Enter the Shank Length (the total length of the drill shank from the tip to the shoulder in millimeters).
  3. Enter the Shoulder Diameter (the diameter at the junction between the drill tip and the shank in millimeters).
  4. Click the Calculate button to compute the effective tip length.
  5. The calculator will display the Tip Length, which is the effective cutting length of your drill tip.

Principle of Calculation

The tip length is calculated based on the geometry of the drill bit. The formula accounts for the difference between the shoulder diameter and the drill diameter, providing the actual effective cutting length of the tip.

Example Application

This calculator is useful for:

  • Machinists determining the effective cutting length for tool selection
  • Metalworking professionals ensuring proper tool engagement
  • Engineering students learning about drill bit geometry
  • Manufacturing professionals optimizing cutting parameters

Important Notes

For accurate results, ensure you measure all dimensions in millimeters and use consistent units throughout your calculations. The calculator assumes standard drill bit geometry and does not account for taper or other specialized features.