How do Profile of surface and Profile of line tolerances differ?

How do Profile of surface and Profile of line tolerances differ?

• A. Profile of surface controls edge path along a line boundary.
• B. Profile of surface controls the line boundary along its length.
• C. Profile of surface controls the entire surface, while profile of a line controls the line boundary along its length.
• D. They are both identical with no distinction.

Answer: (C)

In GD&T, Profile of Surface sets a tolerance zone around the entire defined surface, enforcing how the whole surface should deviate from a true reference surface over its entire extent. It governs the actual geometry of the surface itself, not just a boundary. Profile of a Line, on the other hand, creates a tolerance zone around a specific boundary curve. It constrains only that line boundary along its length, so the boundary must stay within the tolerance, while the interior of the surface beside it can vary more freely unless other controls apply. So the correct distinction is that Profile of Surface controls the entire surface, while Profile of a Line controls the line boundary along its length. The line boundary is a boundary path, not the whole surface.

In GD&T, Profile of Surface sets a tolerance zone around the entire defined surface, enforcing how the whole surface should deviate from a true reference surface over its entire extent. It governs the actual geometry of the surface itself, not just a boundary.

Profile of a Line, on the other hand, creates a tolerance zone around a specific boundary curve. It constrains only that line boundary along its length, so the boundary must stay within the tolerance, while the interior of the surface beside it can vary more freely unless other controls apply.

So the correct distinction is that Profile of Surface controls the entire surface, while Profile of a Line controls the line boundary along its length. The line boundary is a boundary path, not the whole surface.