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Geometrical Tolerancing to BS 8888 and ISO standards – Level 1

  • Standards in context
  • BS 8888 and the ISO system
  • What is Geometrical Tolerancing?
  • Benefits and advantages
  • Features and features-of-size
  • Size tolerances
  • ISO 14405-1 and the Envelope Requirement
  • Datums and datum systems
  • What is a datum?
  • Constructing a datum
  • Datum targets
  • Selection of datum features
  • Controlling 6 degrees of freedom
  • Annotation and symbology
  • Tolerance frames
  • Tolerance features & symbols
  • Tolerance frame modifiers
  • Tolerance frame placement
  • Theoretically Exact Dimensions (TEDs)
  • Tolerance characteristics – what they will and won’t control
  • Location
  • Orientation
  • Form
  • Profile
  • Run-out
  • How to choose which tolerance to use
  • Tolerancing for parts that fit together
  • Worst case boundaries
  • Maximum Material Requirement and Bonus Tolerance (BS EN ISO 2692)
  • Virtual Condition and Virtual Size
  • Restricted application of tolerances
  • Current BS & ISO standards
  • Future developments
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