Three Mating Features GD and T Tolerance Analysis MMC Calculator

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Three Mating Features GD&T Tolerance Analysis at MMC Calculator

This calculator calculates position tolerances utilizing principles and concepts withinASME Y14.5-2009 and ASME Y14.5M - 1994, Geometric Dimensioning and Tolerancing (GD&T).

For the equations behind this calculator, see:
"Geometric Boundaries"
Interpretation and Application of
Geometric Dimensioning and Tolerancing

See application at bottom of page.

This calculator will calculate the required field for the given condition. Calculations are based on a line-line case. Features of size may be other than shaft-hole. Similar features of size such as rectangular shapes may require tolerance specification/calculation along different datum plane.

**Note: As the datums depart from MMC, the datum gets a bonus tolerance. The tolerance zones for the individual features may move off center of the datum by 1/2 the datum bonus tolerance. However, the two tolerance for the two holes must stay inline as a pattern and the same applies for the two external diameters.

Four (6) inputs are required.

See the application illustration at bottom of page.

The following are definitions for the elements:

Hole Feature H1- This is the smallest hole (MMC) or similar other feature of size.

Hole Feature H2- This is the smallest hole (MMC) or similar other feature of size.

Hole Feature H3- This is the smallest hole (MMC) or similar other feature of size.

Hole Tolerance TOL_h2 - This is the positional tolerance for the given feature of size.

Hole Tolerance TOL_h3 - This is the positional tolerance for the given feature of size.

Shaft Feature D1- This is the largest shaft (MMC) or similar other feature of size.

Shaft Feature D2- This is the largest shaft (MMC) or similar other feature of size.

Shaft Feature D3- This is the largest shaft (MMC) or similar other feature of size.

Shaft Tolerance TOL_d2 - This is the positional tolerance for the given feature of size.

Shaft Tolerance TOL_d3 - This is the positional tolerance for the given feature of size.