What is the effect of projecting tolerance height on the numerical tolerance zone?

What is the effect of projecting tolerance height on the numerical tolerance zone?

• A. It reduces the tolerance by projection.
• B. It creates a three-dimensional tolerance zone that extends above the part surface by the projection height.
• C. It ignores projection height.
• D. It requires rework of feature.

Answer: (B)

Projected tolerance zone creates a three-dimensional tolerance volume that extends beyond the actual surface in the projection direction by the specified projection height. This means the numerical tolerance applies not just at the surface, but through the entire projected length, ensuring clearance or positional control as the part will sit or engage with mating features. It does not reduce the tolerance, it explicitly uses the projection height to extend the zone, and it doesn’t imply rework by itself.

Projected tolerance zone creates a three-dimensional tolerance volume that extends beyond the actual surface in the projection direction by the specified projection height. This means the numerical tolerance applies not just at the surface, but through the entire projected length, ensuring clearance or positional control as the part will sit or engage with mating features. It does not reduce the tolerance, it explicitly uses the projection height to extend the zone, and it doesn’t imply rework by itself.