Advanced Applications of GD&T - Course Outline

Recommended Prerequisite Courses:

  • Validate-3D LLC Drawing Practices
  • Validate-3D LLC GD&T Fundamentals
  • Validate-3D LLC GD&T Applications and Tolerance Stack Analysis
  • Validate-3D LLC Measurement Data Reporting per ASME Y14.45

Learning Objectives:

All participants will:

  1. As we proceed through all topics in the course, review the differences between ASME Y14.5M-1994, ASME Y14.5-2009, and ASME Y14.5-2018.
  2. Review feature control frames, and all the specifications that can be placed in each of the three portions of a feature control frame, and the rules regarding those specifications.
  3. Review maximum material condition and least material condition associated with size tolerances.
  4. Gain a thorough understanding of the boundary names virtual condition resultant condition, inner boundary, outer boundary, and worst-case boundary, and how all of these boundary names can be replaced by two names, maximum material boundary and least material boundary.
  5. Gain a thorough understanding of tolerance zones for geometric characteristics provided by ASME Y14.5, and how to combine size and orientation tolerances, or size and location tolerances, to calculate maximum material boundaries and least material boundaries that apply to the surface of a feature.
  6. Gain a thorough understanding of the difference between the surface method and resolved geometry method for tolerances applied at MMC or LMC.
  7. Gain a thorough understanding of how zero tolerance at MMC/LMC is the best tolerance value to choose in all cases.
  8. Gain a thorough understanding of projected tolerance zones.
  9. Gain a thorough understanding of the maximum material boundaries and least material boundaries associated with profile tolerances.
  10. Gain a thorough understanding of the dynamic profile tolerance modifier and its applications that can replace the controlled radius tolerance specification, as well as providing a general form control, and additional capabilities. Verify understanding the presence or absence of a basic dimension does not ever change the effect of any geometric tolerance.
  11. Gain a thorough understanding of the concepts and rules for datum feature simulator (true geometric counterpart) behavior as specified by material boundary modifiers and other modifiers applied to datum feature letters.
  12. Gain a thorough understanding of simultaneous requirements and other grouping mechanism rules.
  13. Gain a thorough understanding of “datum feature shift”.
  14. Gain a thorough understanding of the various ways datum targets and partial datum features and non-inverse datum feature simulators can be used.
  15. Review all modifiers and labels that can be applied per ASME Y14.5.
  16. Review the application of form or orientation tolerances to provide refinement of their respective type of geometric control.
  17. Gain a thorough understanding of composite feature control frame rules and applications, and review the fact that “Multiple single segment feature control frames” are simply separate and independent requirements, with no special rules or names associated with them. Review the acronyms PLTZF and FRTZF and gain a thorough understanding about why one of those acronyms is worse than just being not useful.
  18. Gain a thorough understanding of customized datum reference frame rules and applications.

Course Topics:

This course will follow the learning objective topics, with examples and exercises as needed to provide clarity, and enable a thorough understanding of the subject matter.

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About Your Trainer:

Dean Watts has been providing Geometric Dimensioning and Tolerancing (GD&T) training and consulting since 1999.  Prior to his engineering education he worked in production machining, precision sheet metal, and TIG welding.  He is an American Society of Mechanical Engineers (ASME) Senior Level GD&T Professional (ASME GDTP S-0295).  He is a member of three ASME standards development committees: ASME Y14.5 “Dimensioning and Tolerancing", ASME Y14.8 “Castings Forgings and Molded Parts”, and ASME Y14.45 “Measurement Data Reporting” (Chair).  He holds BSIE and MSME degrees from Oregon State University.  He taught ME 411/511, a GD&T fundamentals course, for 10 years as an adjunct faculty member at Oregon State University.  He is also a former U.S. Navy Submarine Warfare Officer, and retired U.S. Coast Guard Reservist.

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