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ETI Professional Development Seminars

Advanced Concepts of GD&T 1994 3-Day
(Based on Y14.5M-1994)

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This subject is offered in a 2-day, 20-hour, or 3-day format.
Contact ETI to determine which course length best suits your specific need.

ID# ET2011
2.0 CEUs

Providing you have a basic understanding of geometric dimensioning and tolerancing fundamentals, this course teaches the advanced concepts of GD&T as prescribed in the ASME Y14.5M-1994 Standard.

Utilizing the expertise of world-renowned GD&T expert Alex Krulikowski, this course offers an in-depth explanation of advanced GD&T topics like composite tolerancing, tolerance analysis, datum selection, non-rigid part dimensioning, and many more key dimensioning topics, including the system approach for part dimensioning. Newly acquired learning is reinforced throughout the class with more than 250 practice problems.

  • What You Receive
  • Learning Objectives
  • Who Should Attend
  • Topical Outline

Each attendee receives a robust collection of learning resources including:

  • Advanced Concepts of GD&T (ASME Y14.5M-1994) textbook by Alex Krulikowski
  • A GD&T Ultimate Pocket Guide (1994)
  • A Fundamentals of GD&T Exercise Workbook
  • Official certificate of completion

Thousands of students have learned GD&T through Alex Krulikowski’s textbooks, self-study courses, computer based training, and online learning center.  Students who attend courses like this one walk away with more than knowledge. They gain on-the-job skills because the learning materials are performance-based.

By attending this class, you will be able to:

  • Explain the importance of product design and functional dimensioning
  • Define the terms “feature” and “feature of size”
  • Recognize which dimensioning standards apply to an engineering drawing
  • Explain the fundamentals of drawing interpretation and how to handle substandard drawings
  • Recognize the difference between a rigid and a flexible (non-rigid) part
  • State the requirements for tolerancing parts measured in the restrained state
  • Identify the two special considerations for datum usage on restrained (non-rigid parts
  • Calculate advanced applications of form controls
  • Describe uses, advantages, misconceptions, and common errors of the datum system
  • List nine common datum feature types
  • Describe advanced datum target concepts
  • Explain how to specify / interpret specialized datum feature applications
  • Describe modifier usage in tolerance of position applications
  • Describe the effects of simultaneous and separate requirements with tolerance of position
  • Explain composite position tolerancing and multiple single-segment position tolerancing
  • Interpret tolerance of position applications with a conical tolerance zone
  • Explain composite profile tolerancing and multiple single-segment profile tolerancing
  • Describe profile applications

Who Should Attend
This course is valuable for individuals who create or interpret engineering drawings, product and gage designers; process, product, and manufacturing engineers; supplier quality engineers/professionals; CMM operators; buyers/purchasers; checkers; inspectors; technicians; and sales engineers/professionals.

Please be aware that this is not an introductory course. In order to understand the course content, students should have completed ETI's GD&T Fundamentals course or equivalent.

Covers the complete advanced concepts of GD&T; can be completed in a three-day course. Topics covered include:

GD&T Fundamentals Review

  • GD&T skills survey
  • GD&T fundamentals for further study

Importance of Product Design

  • Product design effects on costs
  • Consequences of drawing errors
  • Advantages of GD&T

Functional Dimensioning

  • The purpose of tolerances
  • The importance of specifying proper tolerances
  • The importance of a common tolerancing approach
  • Tolerancing principles and benefits

Interpretation of Feature

  • The terms “element,” “gap,” and “interruption”
  • Y14.5 definition of feature and types
  • Regular, element, complex, and interrupted feature; sub-feature

Interpretation of Feature of Size

  • The terms “opposed,” “fully opposed,” “partially opposed, “size dimension,” and “cylindrical”
  • Importance of distinguishing between a feature and feature of size
  • The definition of feature of size from Y14.5
  • Requirements and categories of a feature of size
  • Identifying and interpreting a complete, interrupted, partial, and bounded feature of size

Applicable Drawing Standards

  • Determining on which standards an engineering drawing is based
  • Clarifying a drawing when no dimensioning standard is referenced
  • Reducing confusion on dimensioning standards

Drawing Interpretation

  • Interpreting an engineering drawing
  • Drawing title block, revision column, general drawing notes
  • Fundamental rules that affect drawing interpretation
  • Surface coating and heat treat
  • Geometric controls and a valid datum system
  • Misconceptions on measuring parts that use the datum system
  • Controlling characteristics for each part feature
  • Proper uses for coordinate tolerancing
  • Specification / interpretation

Using Substandard Drawings

  • Categories of substandard drawing specifications
  • Steps for dealing with substandard drawings
  • Things not to do when using a substandard drawing

Rigid/Non-Rigid Parts Definitions

  • Free state
  • Restrained state
  • Rigid part
  • Non-rigid part and part feature

Tolerancing Non-Rigid Parts

  • Tolerancing a non-rigid (restrained) part
  • Roles of a restraint note
  • Determining restraining conditions on non-rigid parts
  • Requirements that need to be addressed in a restraint note
  • The difference between a general note and a local restraint note
  • When a free state symbol should be used
  • Areas that need special attention when inspecting a non-rigid part

Restrained Part Datum Usage

  • How to use datum targets to support, orient, and locate a restrained part in the datum reference frame
  • How datum shift occurs on a restrained part

Form Controls

  • Calculating the flatness tolerance value for a gasketed joint application
  • Calculating the cylindricity tolerance value in a support application
  • Calculating the straightness tolerance value in an assembly application
  • Overriding Rule #1 to limit flatness on a thin part

The Datum System

  • When to use the datum system.
  • Advantages of the datum system.
  • Common misconceptions about the datum system.
  • Common errors in datum usage

Datum Feature Types

  • Common datum feature types
  • When each datum feature type is typically used
  • Degrees of freedom restrained when each datum feature type is used
  • The datum feature simulator for the datum features referenced in a geometric tolerance

Datum Targets

  • Reducing the impact that using datum targets has on functional dimensioning
  • Application requirements
  • Applications where datum targets should be used
  • Specifying fixed and movable datum targets
  • Special datum target types
  • Dimensioning a simulated gage for datum target applications

Specialized Datum Applications

  • Specifying a screw thread as a datum feature and interpreting application
  • Specifying a gear or spline feature as a datum feature and interpreting application
  • Temporary and permanent datum features
  • Major disadvantage of temporary datum features

Tolerance of Position Usage

  • When to use a tolerance of position control
  • Loss function curve, customer robust dimension, and customer sensitive dimension
  • Tolerance of position control and material condition used

Simultaneous and Separate Requirements

  • Simultaneous and separate requirements, effects and where they apply
  • Tolerance of position at MMC simultaneous requirement
  • Tolerance of position controls as separate requirements      
  • One exception to the simultaneous requirement

Composite Position Tolerancing

  • Rules, advantages, and when to use it
  • “FRITZ” and “PLTZF”
  • Tolerance of position composite application

Multiple Single-Segment Tolerance of Position Tolerancing

  • Rules, advantages, and when to use it
  • Tolerance of position vs. composite tolerance of position

Conical Tolerance Zones

  • A conical tolerance zone and advantage of use
  • Specifying a conical tolerance zone in a tolerance of position application
  • When to use tolerance of position with a conical tolerance zone

Profile Tolerances

  • Myths about profile controls
  • When to use a profile control
  • The four characteristics profile can control
  • Converting coordinate tolerances into profile callouts
  • The profile datum rule

Profile and Simultaneous Requirements

  • Simultaneous requirement applied to profile
  • Profile controls with separate requirements

Composite Profile Tolerancing

  • Composite profile tolerancing, rules, and advantages
  • Interpreting a composite profile application

Multiple Single-Segment Profile Tolerancing

  • Rules, advantages, interpretation, when to use it
  • Profile vs. a composite profile tolerance 

Course summary, final learning assessment

Instructor(s): This course is taught by one of ETI’s approved instructors, each of whom has been vetted and mentored by Alex Krulikowski.

ID# ET2011 - Advanced Concepts of GD&T 1994 3-Day - 2.0 CEUs

You must complete all course contact hours and successfully pass the learning assessment to obtain CEUs.

Fee: Call for pricing

This seminar can be customized to meet the needs of your organization
For onsite workshop information — or to request a custom quote package — contact a GD&T account executive at 1-800-886-0909, email, or use our online training quote request form.


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This file last modified 08/01/17