What is a key question to address when considering implied datums?

When considering implied datums in the context of Geometric Dimensioning and Tolerancing (GD&T), a key question to address is which surface should contact the inspection equipment. This is important because the selection of a surface for contact with the inspection apparatus directly influences the establishment of the datum reference frame. The datum surface serves as a reference point for measurements and ensures that the part can be accurately evaluated against its specified tolerances.

Determining which surface should make contact involves understanding the functional requirements and assembly conditions of the part. This decision is critical for ensuring that the part is inspected in a manner that reflects how it will be used in its final application. Proper alignment and contact with the inspection equipment allow for consistent and reproducible measurement results.

In contrast, the other options are not directly related to the concept of implied datums. The material of the part, its color, and its weight do not fundamentally influence which surfaces should serve as datums for measurement and inspection. These factors may have practical implications elsewhere, but they do not impact the geometrical reference framework critical for GD&T applications.