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.

2. How Does the Calculator Work?

The calculator uses the True Position formula:

Where:

• \( TP \) — True Position (diameter of tolerance zone)
• \( x_{dev} \) — Deviation in X-axis from nominal position
• \( y_{dev} \) — Deviation in Y-axis from nominal position

Explanation: The formula calculates the diameter of the tolerance zone within which the feature's actual position must lie.

3. Importance of True Position Calculation

Details: True Position is critical in manufacturing for ensuring proper fit and function of assembled parts, especially in precision engineering applications.

4. Using the Calculator

Tips: Enter X and Y deviations in inches. The calculator will determine if the hole's position falls within the specified tolerance zone.

5. Frequently Asked Questions (FAQ)

Q1: What units should be used for input?
A: The calculator uses inches for both input and output. Convert metric measurements if necessary.

Q2: How is True Position different from linear tolerancing?
A: True Position creates a circular tolerance zone rather than separate rectangular zones for X and Y directions, allowing more manufacturing flexibility.

Q3: What does the multiplier 2 represent in the formula?
A: The 2 converts the radial deviation to a diameter value, which is how True Position is typically specified.

Q4: When is True Position typically used?
A: Commonly used for hole patterns, mounting features, and any critical locating features in mechanical designs.

Q5: Can this calculator be used for 3D position?
A: This version calculates 2D position only. For 3D position, Z-axis deviation would need to be included in the calculation.