What does true position specify?

What does true position specify?

• A. The size of a feature relative to datums.
• B. The surface finish around a hole.
• C. The allowable location of a feature’s axis/center relative to a datum reference frame.
• D. The orientation of a feature relative to datums.

Answer: (C)

True position specifies where the center or axis of a feature must lie in relation to the datum reference frame. It defines a tolerance zone, typically cylindrical and aligned with the feature’s axis, within which the actual axis must lie through the entire depth of the feature. This is the essence of controlling location: you’re not fixing size, surface texture, or orientation, but where the center or axis is located relative to the datums. So the correct interpretation is that true position governs the allowable location of a feature’s axis or center with respect to the datum frame. The other aspects—size, surface finish, or orientation—are handled by different GD&T controls.

True position specifies where the center or axis of a feature must lie in relation to the datum reference frame. It defines a tolerance zone, typically cylindrical and aligned with the feature’s axis, within which the actual axis must lie through the entire depth of the feature. This is the essence of controlling location: you’re not fixing size, surface texture, or orientation, but where the center or axis is located relative to the datums. So the correct interpretation is that true position governs the allowable location of a feature’s axis or center with respect to the datum frame. The other aspects—size, surface finish, or orientation—are handled by different GD&T controls.