What does a feature control frame contain?

• A. Just the geometric tolerance
• B. Only dimension values
• C. The geometric tolerance along with datum references and modifiers
• D. Only datum references

Answer: (C)

A feature control frame is a crucial component in Geometric Dimensioning and Tolerancing (GD&T) as it communicates specific requirements for the control of a feature's geometry on a part. The correct answer includes the geometric tolerance, datum references, and any modifiers.

The geometric tolerance defines the permissible variation of the feature's geometry, which could include aspects such as form, orientation, location, or profile. Datum references are essential as they establish a point of origin or reference used to control the feature's position and orientation in relation to other features or the overall part. Modifiers may include conditions that further clarify the requirements, such as maximum material condition or least material condition.

By combining all these elements, the feature control frame provides a comprehensive set of instructions that ensure parts are manufactured and inspected correctly, allowing for the intended function and interchangeability of parts in assembly. Understanding this framework is vital for anyone involved in design, manufacturing, and quality assurance.