What does true position tolerance apply to in a hole pattern?

What does true position tolerance apply to in a hole pattern?

• A. The diameter of each hole.
• B. The centers of the holes within the DRF.
• C. The distance between holes.
• D. The pattern's orientation to datum planes.

Answer: (D)

True position is a location constraint tied to the datum reference frame, and for a hole pattern it governs how the pattern as a group sits in space relative to the datum planes. When you apply true position to the pattern, you’re specifying the theoretical pattern location and orientation with respect to the datums—the centers of the holes must align with that pattern in space. If the pattern were rotated or shifted away from its defined orientation to the datum planes, the centers would fall outside the tolerance zone, so the part would fail. The other aspects—hole diameter, spacing, or a separate orientation control—are not what the true position for a pattern is enforcing by itself; true position ties the pattern’s placement and orientation to the datum planes.

True position is a location constraint tied to the datum reference frame, and for a hole pattern it governs how the pattern as a group sits in space relative to the datum planes. When you apply true position to the pattern, you’re specifying the theoretical pattern location and orientation with respect to the datums—the centers of the holes must align with that pattern in space. If the pattern were rotated or shifted away from its defined orientation to the datum planes, the centers would fall outside the tolerance zone, so the part would fail. The other aspects—hole diameter, spacing, or a separate orientation control—are not what the true position for a pattern is enforcing by itself; true position ties the pattern’s placement and orientation to the datum planes.