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Datum Schemes for GD&T


Many problems we face in industry, especially dimensional concerns, have faulty datum schemes as their root cause. Datum schemes must be explicit, functional, and repeatable. If any of these requirements are not met, financial loss occurs.

This mid-level two-day course begins with a fast-paced review of the basics, so you can bring your GD&T skills in line with the 2009 standard. Our primary focus is on datum strategies for assemblies and the detail components that comprise them. We teach you to spot datum problems so you can resolve these issues during product development.

Course Outline:

  • Introduction
  • Selective Review of the Basics
  • Fundamental of Datums
  • Rules and Details - ASME Y14.5 - 2009
  • Issues Regarding Part Restraint
  • Common Types of Datum Features
  • Datum Target Applications
  • Special Datum Applications
  • Common Datum Errors
  • Preventing Dimensional Problems

    Key Course Objectives:

  • Review recent changes to ASME Y14.5 - 2009

  • Identify degrees of freedom constrained by datum features

  • Identify datum problems prior to manufacturing

  • Interpret the impact of datum boundary modifiers

  • Select most appropriate datum features in the right order

  • Mark A. Morris has more than 30 years experience in tooling and manufacturing as a skilled machinist, toolmaker, college instructor, technical writer, and quality professional in roles from Quality Engineer to Director of Continuous Improvement. His expertise lies in dimensional issues, reliability, maintainability, and quality systems. Mr. Morris' credentials include undergraduate degrees focused on manufacturing engineering, industrial education, and metalworking; Master of Education degree from the College of Technology at Bowling Green State University; CQE, CRE, and CQA certifications from the American Society for Quality; and Senior Level Geometric Dimensioning and Tolerancing Professional (GDTP) certification from the American Society of Mechanical Engineers. Mr. Morris also has served as Education Chair for the Ann Arbor section of ASQ, teaching candidates to become ASQ Certified Quality Engineers. He presently serves as Chair of the Ann Arbor section of ASQ and as Adjunct Faculty for Eastern Michigan University.

    This course is not currently scheduled. Please email us at for information about the next offering or if you are a business looking for customized training.

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