Geometrical tolerancing on drawings deliver a completeness, clarity and precision that co-ordinate dimensioning cannot come close to.

Geometric tolerancing:

• uses a universal language of symbols which allows a design engineer to precisely and logically describe part features in a way they can be accurately manufactured and inspected
• communicates geometry (shape and location) dimensions and tolerance to a degree of accuracy and precision that is required for each part
  
• ensures the part and geometry defined on the drawing leads to the desired part and fit (within tolerance limits) and function as intended - improving in quality, cost and delivery of product

The utilisation of geometrical tolerancing on drawings is by:

• geometric references (datum features)
• feature control frames
• geometric characteristics (symbols)
• tolerance zone

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Good practice online modules

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• 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