Fundamentals of GD&T


If you have basic understanding of mechanical drawings, we can teach you the terms, rules, symbols and concepts of GD&T as prescribed in the ASME Y14.5M-1994 standard.

 Who should attend:

All those who use GD & T to design, produce and inspect parts: mechanical engineers, designers, managers, production planners, quality inspectors, mechanics, etc.

Course Highlights:

The workshop is based on a series of goals and objectives. It includes numerous practices problems and in-depth  coverage of Dimensioning and Tolerancing. You will learn the benefits of GD&T and the ability to interpret  GD&T on drawings.

Course description (2 days)

You’ll discover the major pitfalls of traditional coordinate tolerancing – and how they may overcome by using Geometric Tolerancing. Then, starting with your basic blueprint knowledge, you’ll learn the symbols, terminology and rules of Geometric Tolerancing as prescribed in the standard (ASME Y14.5M 1994). Also you will learn the relationship between tolerances and how the most economically apply the concepts.


• Engineering Drawings.
• GD&T coordinate dimensioning comparison.
• Eight key GD&T terms.


• GD&T modifiers and symbols.
• Rule #1 and Rule #2.
• Basic dimensions, virtual condition, bonus tolerance.


• Six Degrees of Freedom.
• Datums.
• Datum Features.
• Simulators.
• Symbol Placement.
• Datum Precedence.
• Datum Targets.
• Datum Feature at Virtual condition.


• Perpendicularity.
• Parallelism.
• Angularity.
• Tangent Plane.

Runout controls:

• Circular runout.
• Total runout.

 Tolerance and Locations controls:

• Definitions, conventions, advantages, basic theories MMC, LMC and RFC tolerance of position applications,
• Projected tolerance zone.
• Non circular features.
• Cartoon gages for tolerance of position (MMC) applications Tolerance of position special applications.
• Calculations distances on parts dimentioned with tolerance of position.
• Fixed and floating fastener formulas.
• Concentricity.
• Symmetry.
• Spherical features.


• Flatness.
• Straightness.
• Circularity (Roundness).
• Cylindricity.

 Profiie Controls:

• Profile Tolerancing.
• Profile of a surface.
• Profile of a line.
• Composite Profile.