Objectives

• Understand the fundamental principles on which GDT is based.
• Understand the correct use of the Datum system.
• Recognise the various controls applied within the GDT system.
• Know how to read and assess Geometric Tolerances.
• Understand the ‘Bonus concept’ and be able to use it.
• Be able to read, interpret & speak the language of GDT.

Areas Covered / Key Benefits

The topics covered include :-

1. The use of the ‘Envelope Principle’ and the ‘Size controls Form’ philosophy.

2.The consideration of maximum and minimum material conditions.

3.Consideration of the shape & effects of tolerance zones.

4.The ‘Bonus concept’ available due to Geometric Tolerancing.

5.The use of a datum system in specifying relationships of feature and characteristics

            - The ‘Virtual Condition’ philosophy for tolerance stacking.

            - The opportunities for design of verification gauges to replace costly inspection exercises.

A major component of the course material is the symbolic GDT language. This language provides a way by which the design can be most effectively communicated. The use of symbols eliminates the need for lengthy and complex notes on the design. As with any language, practice in reading, interpreting, and speaking is vital for full understanding. For this reason the course includes language practice at many points, and participants are coached in using the language.