What does a true position tolerance regulate?

What does a true position tolerance regulate?

• A. The positioning of a feature relative to datums within the specified cylindrical tolerance zone.
• B. The size of a hole.
• C. The orientation of a feature relative to datums.
• D. The curvature of a surface.

Answer: (A)

True position tolerance regulates where a feature resides relative to the datum references, by defining a cylindrical tolerance zone around the feature’s true location. The feature’s axis (for holes or bosses) must lie within that cylinder, which is oriented by the datum frame and has a diameter equal to the specified true position tolerance. This controls location in three dimensions, not size, orientation, or curvature. The size of a hole is governed by a separate size tolerance, orientation by orientation-related tolerances (like perpendicularity or angularity), and curvature by other surface tolerances.

True position tolerance regulates where a feature resides relative to the datum references, by defining a cylindrical tolerance zone around the feature’s true location. The feature’s axis (for holes or bosses) must lie within that cylinder, which is oriented by the datum frame and has a diameter equal to the specified true position tolerance. This controls location in three dimensions, not size, orientation, or curvature. The size of a hole is governed by a separate size tolerance, orientation by orientation-related tolerances (like perpendicularity or angularity), and curvature by other surface tolerances.