GD&T Training BY DUCAT

Geometric dimensioning and tolerancing (GD&T) is used as a symbolic way of showing specific tolerances on drawings. GD&T is a valuable tool that effectively communicates the design intent to manufacturing and inspection. It is governed by the technical standard ASME Y14.5M-2009. This course introduces participants to the GD&T system, providing a working knowledge of the correct interpretation and application of each symbol, general rules, the datum system, and 'bonus' tolerance and highlighting some of the changes in the updated Y14.5 standard. The material is reinforced with many practice exercises.

Engineering Drawing

  • Anatomy Of drawing

  • Orthographic Projection
  • Angle Projections
  • Dimensioning
  • Spacing and Readability
  • Dimension placement
  • View Placements

Limits, Fits and tolerances

  • Factors influencing fits

  • Hole base system and shaft based system
  • Fundamental deviations
  • IT Grades
  • Difference between tolerance andallowance


  • Geometric Tolerance

  • Advantages
  • Symbols
  • Feature control frame
  • Tolerance groups
  • Hierarchy of GD&T
  • 4 Rules of GD&T
  • Maximum material condition
  • Least material condition
  • Regardless of features
  • Bonus tolerance
  • Datum/Datum feature
  • Datum Reference
  • Datum target
  • Degree of freedom
  • Explanation of 14 geometric symbols

Surface Roughness

  • Surface texture

  • Orders of Geometrical irregularities
  • Micro Geometrical error
  • Surface Measurement Lengths
  • Terminologies
  • Evaluation of Surface roughness
  • General indication of surface texture on drawings
  • Requirements of Machining
  • Direction of lay

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