Feature Control Frame

Definition

A feature control frame is a symbolic representation used in engineering drawings that defines the allowable variation for a specific geometric feature on a part. It consists of a rectangular box that contains tolerance specifications, which communicate how much deviation from a specified dimension or geometry is acceptable. This tool is essential for ensuring parts fit together correctly and function as intended, making it a critical component in dimensioning and tolerancing practices.

5 Must Know Facts For Your Next Test

1. The feature control frame contains important information such as geometric tolerance symbols, the type of tolerance, and any associated datums that define the relationship between features.
2. Each feature control frame can control multiple aspects of a part's geometry, including size, orientation, location, and runout, providing comprehensive control over the manufacturing process.
3. The first compartment of a feature control frame specifies the geometric characteristic being controlled, while subsequent compartments provide additional information such as the tolerance value and related datums.
4. Feature control frames help to ensure clarity and reduce misinterpretation in engineering drawings, allowing manufacturers to produce parts that meet specified criteria with precision.
5. Using feature control frames effectively can lead to increased productivity by reducing inspection times and minimizing the risk of producing nonconforming parts.

Review Questions

• How does a feature control frame improve communication in engineering drawings?
  • A feature control frame enhances communication by providing a standardized method for indicating tolerances on engineering drawings. It clearly defines the allowable variations for specific features, making it easier for manufacturers to understand the precise requirements for part production. This clarity helps reduce misunderstandings and ensures that parts are produced to meet design specifications, which ultimately leads to better product quality.
• Discuss the importance of datums in relation to feature control frames.
  • Datums play a crucial role in feature control frames as they serve as reference points for measuring the geometric features of a part. By defining a datum, designers can establish relationships between different features and set up tolerances accordingly. This ensures that all features are aligned properly during manufacturing and assembly processes. Without clear datum references within feature control frames, it would be challenging to maintain consistency and accuracy across various components.
• Evaluate how effective use of feature control frames impacts manufacturing efficiency and product quality.
  • Effective use of feature control frames significantly enhances manufacturing efficiency and product quality by providing clear guidelines for acceptable variations in part dimensions. By clearly communicating tolerances through these frames, manufacturers can streamline their production processes and reduce inspection times. Additionally, when parts are produced according to well-defined tolerances, there is a lower likelihood of defects or nonconformance. This ultimately leads to cost savings, improved product reliability, and higher customer satisfaction due to consistent quality.

Related terms

Geometric Dimensioning and Tolerancing (GD&T): A system for defining engineering tolerances that utilizes symbols to communicate the allowable variations in size, form, orientation, and location of part features.

Datum: A reference point, line, or surface used as a basis for measurement and for establishing other geometric controls in the design of a part.

Tolerance:

The permissible limit or limits of variation in a physical dimension, often specified to ensure proper function and interchangeability of parts.