If MMC is not specified, how does the true position tolerance behave with respect to feature size?

If MMC is not specified, how does the true position tolerance behave with respect to feature size?

• A. It remains fixed and tied to basic position target regardless of feature size unless an MMC modifier is used
• B. It increases with feature size
• C. It decreases with feature size
• D. It becomes undefined

Answer: (A)

Without MMC, the true position tolerance is defined at the basic size and does not change as the actual feature size varies. The positional tolerance zone is fixed in diameter equal to the stated true position value (a cylindrical zone around the true position), so the permissible deviation remains the same regardless of whether the hole or shaft ends up larger or smaller within its size tolerance. If an MMC modifier were used, the tolerance zone would then become size-dependent, expanding or contracting with the actual size of the feature.

Without MMC, the true position tolerance is defined at the basic size and does not change as the actual feature size varies. The positional tolerance zone is fixed in diameter equal to the stated true position value (a cylindrical zone around the true position), so the permissible deviation remains the same regardless of whether the hole or shaft ends up larger or smaller within its size tolerance. If an MMC modifier were used, the tolerance zone would then become size-dependent, expanding or contracting with the actual size of the feature.