When targets are used for the primary datum, they must also be used for secondary and tertiary datums.

Question

Quizplus · Accepted Answer

Targets are not required for secondary and tertiary datums once they are used for the primary datum. The use of targets is specific to the requirements of the datum feature and its relationship to the part being measured or manufactured, and there is no rule that mandates their use for all datum levels once used for the primary.

When Targets Are Used for the Primary Datum, They Must