Which statement about profile tolerances and true position is most accurate?

Which statement about profile tolerances and true position is most accurate?

• A. Profile tolerance sets a size constraint; true position sets boundary shape.
• B. Profile tolerance sets the boundary shape of a surface; true position sets a feature’s location relative to datums.
• C. Profile tolerance controls datums; true position controls material condition
• D. Profile tolerance controls diameter; true position controls distance

Answer: (B)

Profile tolerances establish the allowable boundary for a surface, controlling the shape and extent of that surface’s boundary relative to the datum frame. They define where the surface must lie in relation to the true profile, effectively shaping the boundary envelope that the actual surface must fit inside. True position, in contrast, expresses how far a feature’s actual location can deviate from its ideal location with respect to datums, i.e., it specifies the feature’s placement tolerance relative to the datum framework. So, the profile tolerance governs the boundary shape of the surface, while true position governs the feature’s location relative to datums.

Profile tolerances establish the allowable boundary for a surface, controlling the shape and extent of that surface’s boundary relative to the datum frame. They define where the surface must lie in relation to the true profile, effectively shaping the boundary envelope that the actual surface must fit inside. True position, in contrast, expresses how far a feature’s actual location can deviate from its ideal location with respect to datums, i.e., it specifies the feature’s placement tolerance relative to the datum framework. So, the profile tolerance governs the boundary shape of the surface, while true position governs the feature’s location relative to datums.