The datums shown in alphabetical order that appear in the feature control frame are not chosen for in any particular reason.

Question

Quizplus · Accepted Answer

The datums shown in alphabetical order in the feature control frame are chosen in a specific order based on a datum hierarchy. This hierarchy determines the primary, secondary, and tertiary datums for the part, which are necessary for establishing its orientation and dimensional features. The alphabetical order is used to indicate their hierarchy, with the primary datum labeled as A, followed by B and C for secondary and tertiary datums, respectively.

The Datums Shown in Alphabetical Order That Appear in the Feature