The feature control frame is like a basic sentence that can be read from left to right.

It defines characteristic type, tolerance shape and value and datum references.

The number of compartments in the feature control frame can vary. This is dependent on the characteristic type used, whether single or related and what the functional requirements are.

 

Example of a feature control frame

Positional tolerance uses a feature control frame to specify the tolerance zone required to accurately locate a feature or a group of features such as centre point(S), centre axis, or the centre of a plane.

Indicates this is a cylindrical feature.

Too see this in context:

2 of 8

Good practice online modules

← Return to the main menu

• Dimensional
• Overview of basic design and interpretation of an engineering drawing
• An introduction to datum
• An introduction to geometric tolerancing
• An introduction to the designer's role when designing a component
• An introduction to the manufacturer's role when designing a component
• An introduction to the inspector's role when designing a component