Dimensional Consulting

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Functional Gaging
Phone:  248-904-8535
Email:  dave@dimensionalconsulting.com


  The Functional Gaging class is a one day class.

This class is an explanation of the ASME Y14.43 Functional Gaging standard.

The textbook for this class was written by Dave Slopsema at Dimensional Consulting.


Students for this class are expected to already have a fundamental understanding of Geometric Dimensioning and Tolerancing.


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The Functional Gaging class covers:

  • General Concepts and definitions
  • Absolute Tolerancing
  • Optimistic Tolerancing
  • Practical Absolute Tolerancing
  • Tolerant Tolerancing
  • Typical Gaging examples
  • Accounting for Wear
  • Moveable datums specified in datum reference frame
  • Coaxial Datums
  • External Threads
  • Moveable datums with the “Bird Beak” symbol
  • Irregular shaped hole as a datum
  • Composite Tolerance
  • Using push pins and threaded holes
  • Datum callouts specifying degrees of freedom
  • Planar datums at MMB and BASIC



Soft cover copies of the textbook are provided and used in class.

As a preview, you can purchase a pdf copy of the textbook by following the link below

Purchase Functional Gaging Textbook
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