Introduction to Geometrical Tolerancing for Interpreters
What is it?
An intensive three-day course introducing the fundamental principles of geometrical tolerancing (to BS 8888 and relevant ISO standards), specifically for engineers and technicians who are required to interpret specifications.

This course has the same fundamental content as the standard introductory course, but approached from an interpreter's point of view.
  • Discover how the system of geometrical tolerancing works.


  • Find out how to interpret datum markers and tolerance frames.

  • Learn how different types of tolerance control different characteristics, and the correct way to interpret the different tolerance characteristics.
Duration
3 days.  The three days do not have to be run consecutively, so the course can be broken down into a number of smaller units.

Who is it for?
Mechanical and production engineers, metrologists, technicians and machine operators.

Some familiarity with engineering drawing practice and conventional dimensioning and tolerancing is required.
What does it cover?
  • what is Geometrical Tolerancing?
  • the benefits of Geometrical Tolerancing
  • features and features-of-size
  • principles of Dependency & Independency
  • the elements of Geometrical Tolerancing
    • tolerance frames
    • tolerance features & symbols
    • tolerance frame modifiers
  • reading the tolerance frame
  • datums and datum systems
    • what is a datum?
    • datum features
    • datum planes & axes
    • datum targets
    • reading datums from drawings
  • basic dimensions
  • tolerance characteristics - what they will and won't control
    • location
    • orientation
    • form
    • profile
    • run-out
module1
  • Worst case boundaries
  • Virtual Condition or 'gauge size'
  • Maximum Material Principle
    • bonus tolerances
    • Maximum Material Condition (MMC) with zero tolerances
    • Least Material Condition (LMC)
    • using MMC with datums and datum shift
  • restricted application of tolerances
  • combined tolerances used to control hole patterns
  • standards
    • current BS & ISO standards
    • future developments
module2