1. What is True Position?

True Position is a GD&T (Geometric Dimensioning and Tolerancing) specification that defines the permissible variation in the location of a feature from its exact position. It's commonly used for holes and other critical features in manufacturing.

2. How Does the Calculator Work?

The calculator uses the True Position formula:

Where:

• \( measured\_x \) — Actual measured X coordinate
• \( nominal\_x \) — Design nominal X coordinate
• \( measured\_y \) — Actual measured Y coordinate
• \( nominal\_y \) — Design nominal Y coordinate

Explanation: The formula calculates the radial distance between the measured and nominal positions, then doubles it to get the total position deviation.

3. Importance of True Position Calculation

Details: True Position is critical in manufacturing to ensure parts fit together properly. It's widely used in automotive, aerospace, and precision engineering industries.

4. Using the Calculator

Tips: Enter all coordinates in inches. The calculator accepts decimal values for precise measurements. Ensure measurements are taken from the same reference points as the nominal values.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 2 in the formula?
A: The multiplication by 2 converts the radial deviation into diameter deviation, which is the standard way to report True Position.

Q2: What units are used for True Position?
A: Typically inches or millimeters, matching the units of your drawing or specification.

Q3: How accurate should my measurements be?
A: Measurements should be at least one order of magnitude more precise than your True Position tolerance.

Q4: Does this work for 3D position?
A: This calculator is for 2D position only. For 3D position, you would need to include Z-axis measurements.

Q5: What's a typical True Position tolerance?
A: Common tolerances range from 0.005" to 0.030" for precision parts, but always check your specific drawing requirements.