When would you use angularity in a callout?

When would you use angularity in a callout?

• A. When a feature must be perpendicular to a datum.
• B. When a feature must be parallel to a datum.
• C. When a feature must lie at a specific angle relative to a datum.
• D. When a datum surface cannot be measured.

Answer: (C)

Angularity constrains the angle between a feature and a datum. You use it when a feature must lie at a specific angle relative to a datum, such as a hole axis or a surface that must tilt to a particular orientation with respect to a datum plane or axis. The tolerance zone defined by angularity preserves that exact angular relationship within the stated tolerance. This is different from perpendicularity (which enforces a 90-degree angle) or parallelism (which enforces a specific angle of 0 degrees to the datum). The idea of a datum surface being unmeasurable isn’t what angularity addresses.

Angularity constrains the angle between a feature and a datum. You use it when a feature must lie at a specific angle relative to a datum, such as a hole axis or a surface that must tilt to a particular orientation with respect to a datum plane or axis. The tolerance zone defined by angularity preserves that exact angular relationship within the stated tolerance. This is different from perpendicularity (which enforces a 90-degree angle) or parallelism (which enforces a specific angle of 0 degrees to the datum). The idea of a datum surface being unmeasurable isn’t what angularity addresses.