Which statement describes the true position requirement for a hole pattern?

Which statement describes the true position requirement for a hole pattern?

• A. The true position requirement applies to the centers of features within the DRF.
• B. The true position requirement constrains only the distance from datums, not orientation.
• C. It constrains the centers to lie within the true position tolerance zone relative to the DRF.
• D. It is not used for hole patterns.

Answer: (C)

The true position for a hole pattern specifies where the centers of all holes in the pattern must be located relative to the datum reference frame. The tolerance zone is a cylinder whose axis is the hole axis and whose diameter equals the stated position tolerance. All hole centers in the pattern must fall inside that cylindrical zone when the part is oriented in the DRF. This ties the pattern to the datums and ensures the holes sit precisely where the design intends, which is essential for proper assembly and function. The other ideas don’t fit because true position describes the allowable location of the centers with respect to the DRF, not simply a distance to datums, and it governs location of the centers (not the overall orientation by itself, which is handled by other tolerances). And a hole pattern does use true position to control its centers, so saying it isn’t used for hole patterns isn’t correct.

The true position for a hole pattern specifies where the centers of all holes in the pattern must be located relative to the datum reference frame. The tolerance zone is a cylinder whose axis is the hole axis and whose diameter equals the stated position tolerance. All hole centers in the pattern must fall inside that cylindrical zone when the part is oriented in the DRF. This ties the pattern to the datums and ensures the holes sit precisely where the design intends, which is essential for proper assembly and function.

The other ideas don’t fit because true position describes the allowable location of the centers with respect to the DRF, not simply a distance to datums, and it governs location of the centers (not the overall orientation by itself, which is handled by other tolerances). And a hole pattern does use true position to control its centers, so saying it isn’t used for hole patterns isn’t correct.