Feature Control Frame

Definition

A feature control frame is a rectangular box used in engineering drawings that contains information about the geometric tolerances applied to a specific feature of a part. It communicates the allowable variation in size, form, orientation, and location of features, ensuring parts fit together as intended. The frame consists of a series of symbols and values that convey precise manufacturing requirements.

5 Must Know Facts For Your Next Test

1. Feature control frames can include multiple tolerance types such as profile, position, and angularity to specify different aspects of the feature's geometry.
2. Each feature control frame consists of an arrow pointing to the feature being controlled, along with the tolerance value and any datums referenced.
3. The proper use of feature control frames helps reduce manufacturing errors and ensures that parts will function together effectively when assembled.
4. Feature control frames play a crucial role in quality assurance processes by providing clear criteria for inspection and measurement of manufactured parts.
5. Understanding how to read and apply feature control frames is essential for effective communication between designers, engineers, and manufacturers.

Review Questions

• How does a feature control frame contribute to the overall quality and functionality of manufactured parts?
  • A feature control frame contributes to quality and functionality by clearly specifying the allowable variations in a part's features. By defining tolerances for size, shape, and position through symbols and values, it guides manufacturers in producing parts that will fit together correctly. This precise communication minimizes errors during manufacturing and assembly, ultimately enhancing the product's performance.
• Discuss the components of a feature control frame and their significance in engineering drawings.
  • A feature control frame typically consists of an arrow pointing to the controlled feature, tolerance values, geometric symbols, and any referenced datums. Each component serves a purpose; for example, the symbols denote the type of tolerance applied (like position or profile), while the values specify how much deviation is acceptable. This detailed information is critical for ensuring that parts meet design specifications and function properly in their intended application.
• Evaluate the impact of effective use of feature control frames on manufacturing processes and outcomes.
  • The effective use of feature control frames significantly impacts manufacturing processes by streamlining communication between design and production teams. By providing clear specifications, these frames help prevent misinterpretations that could lead to costly mistakes or rework. This clarity not only enhances productivity but also contributes to higher quality products that meet performance standards. In turn, this can lead to reduced production costs and increased customer satisfaction.

Related terms

Geometric Dimensioning and Tolerancing (GD&T): A system for defining and communicating engineering tolerances using symbolic language on engineering drawings.

Datum:

A reference point or surface from which measurements are made, crucial for establishing tolerances and relationships between features.

Tolerance Zone: The area within which a feature must lie to meet the specified tolerances, indicating acceptable limits for dimensions or geometries.