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Fundamentals of GD&T for Inspectors 2-day ET2053

Providing you have a basic understanding of geometric dimensioning and tolerancing fundamentals, this course teaches an introduction to how to inspect GD&T requirements.

Utilizing the expertise of world-renowned GD&T expert Alex Krulikowski, this course offers an explanation of the geometric symbols, rules, and concepts, the datum system, and how to inspect GD&T requirements using tools from the four categories of inspection tools (CMM; comparison instruments and fixed gages; hand tools and open set up; and production gaging systems). Newly acquired learning is reinforced throughout the class with numerous practice problems.

The scope of the workshop does not include how to use the various inspection tools. For example, the workshop will discuss how to locate a part for inspection on a CMM, but it will not cover how to program the CMM to gather the data point.

Each attendee receives a robust collection of learning resources including:

  • A copy of The Fundamentals of GD&T Using Critical Thinking Skills (ASME Y14.5-2009), by Alex Krulikowski
  • A GD&T Ultimate Pocket Guide (2009)
  • A Fundamentals of GD&T for Inspectors Workbook
  • Class handouts
  • 90-day access to "Engineering Drawing Requirements" Web Based Training based on ASME Y14.100-2004 and ASME Y14.24-1999, (a $55 value.) to practice and reinforce what was learned in the classroom

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.

Learning Objectives
By attending this class, you will be able to:
  • Describe inspection and engineering drawings
  • Explain key terms used in GD&T and how they affect interpretation and inspection
  • Recognize the modifiers and symbols used in geometric tolerancing
  • Interpret and inspect Rule #1,Rule #2, flatness, straightness, circularity, cylindricity, perpendicularity, angularity, parallelism, concentricity, symmetry, circular and total runout
  • Explain the concepts of basic dimensions, virtual condition, inner and outer boundary and bonus tolerance and their effects on inspection
  • Interpret and simulate planar datums and datum targets for inspection
  • Interpret and inspect feature of size datums RFS and MMC
  • Explain the fundamental concepts of tolerance of position: definitions, conventions, advantages and interpretations and their effects on inspection
  • Interpret and inspect tolerance of position RFS, MMC, and special applications
  • Describe functional gages for tolerance of position (MMC) applications
  • Explain profile tolerancing
  • Interpret and inspect profile of a surface and profile of a line 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.

Students should have completed ETI's Engineering Drawing Requirements course or equivalent.

  • Quality parts and quality drawings
  • Inspection, importance, components, and the characteristics of an expert inspector
  • Sources of variation
  • Categories of inspection tools

The Engineering Drawing

  • Engineering drawings, communication, and drawing errors
  • Dimension, tolerance, limit tolerance, plus-minus tolerance
  • Metric unit dimensions on drawings
  • Interpreting dimensional limits
  • ASME Y14.5M-1994 and the fundamental dimensioning rules

Key Terms and Their Effect on Interpretation and Inspection

  • Feature, feature of size, cylindrical feature of size, planar feature of size
  • Actual local size, actual mating envelope of external and internal feature of size
  • Maximum and least material condition of a feature of size
  • Non-feature of size dimensions and regardless of feature size

Modifiers and Symbols

  • Modifiers, geometric characteristic symbols, and controls
  • Radius and controlled radius
  • Feature control frame

Interpreting and Inspecting Rule #1 and Rule #2

  • Rule #1, envelope boundary, size dimension, overriding, and exceptions
  • Rule #1 effects on the interrelationship between features of size
  • Inspecting a feature of size controlled by Rule #1
  • Rule #2

Basic Concepts

  • Basic dimensions, virtual condition and uses in inspection
  • Inner, outer, worst-case boundary, and virtual condition of a feature of size
  • Geometric tolerance applied to feature or feature of size
  • Bonus tolerance calculations
  • MMC and LMC modifiers and inspection

Interpreting and Inspecting Flatness

  • Flatness, flatness tolerance zone, location, and inspection
  • Rule #1 as an indirect flatness control
  • Legal flatness specification
  • Establishing a reference plane for flatness

Interpreting and Inspecting Straightness

  • Straightness, straightness tolerance zone, and Rule #1 as indirect straightness control
  • Legal straightness specification
  • Inspecting straightness applied to a surface
  • Determining if a straightness control is applied to a surface or a feature of size

Interpreting and Inspecting Circularity

  • Circularity, circularity tolerance zone, and inspection
  • Rule #1 as an indirect circularity control
  • Legal circularity specification

Interpreting and Inspecting Cylindricity

  • Cylindricity, cylindricity tolerance zone, and inspection
  • Rule #1 as an indirect cylindricity control
  • Legal cylindricity specification

Interpreting and Simulating Planar Datums for Inspection

  • True geometric counterpart, datum feature simulator, and simulated datum
  • Datum feature symbol, planar datums, datum reference frame
  • Choosing datum features and what controls their orientation
  • Six degrees of part freedom in space and the 3-2-1 Rule
  • Datum-related and non datum-related dimensions
  • Datum reference frame for a part with inclined datum features
  • Coplanar datum features and simulation for inspection

Interpreting and Simulating Datum Targets for Inspection

  • Datum targets, specification, requirements and the datum target symbol
  • Basic dimensions used to locate datum targets
  • Point, line, and area datum targets
  • Simulated gage for a point, line, and area datum target applications
  • Simulating datum targets for inspection

Interpreting and Inspecting Feature of Size Datums (RFS)

  • Datum that results from a feature of size datum feature
  • Specifying an axis or center plane as a datum
  • How feature of size datum references communicate size condition
  • Datum feature simulators and coaxial datum features

Interpreting and Inspecting Feature of Size Datums (MMC)

  • Referencing a feature of size datum at MMC
  • Special-case feature of size datums
  • Datum shift and datum application
  • Datum feature simulator – external / internal feature of size datum feature (MMC primary), MMC primary and secondary virtual condition
  • Datum axis for a pattern of features of size (MMC secondary)
  • Datum reference sequence and part to gage setup
  • Simulating datum features of size MMC for inspection

Interpreting and Inspecting Perpendicularity

  • Perpendicularity tolerance on implied right angles, tolerance zone shapes
  • Perpendicularity of a surface and the surface flatness
  • Multiple datum references with a perpendicularity control
  • Perpendicularity of the axis/center plane of a feature of size
  • Perpendicularity control and worst-case boundary of a feature of size
  • Gage for verifying perpendicularity at MMC
  • Indirect perpendicularity controls, legal perpendicularity specification; inspection

Interpreting and Inspecting Angularity

  • Angularity, tolerance zone, and inspection
  • Angularity of a surface and the surface flatness
  • Angularity control and the worst-case boundary of a feature of size
  • Angularity of the axis/center plane of a feature of size
  • Indirect angularity controls, legal angularity specification

Interpreting and Inspecting Parallelism

  • Controlling parallelism when no symbol is shown
  • Parallelism, tolerance zone shapes, applied to a surface, and inspection
  • Parallelism of a surface and the flatness of the surface
  • Controlling the parallelism of the axis/center plane of a feature of size
  • Parallelism control and the worst-case boundary of a feature of size
  • Tangent plane modifier with a parallelism control
  • Indirect parallelism controls, legal parallelism specification

The fundamental Concepts of Tolerance of Position: Definitions, Conventions, Advantages and Interpretations and Their Effects on Inspection

  • True position
  • Tolerance of position control, advantages, use of MMC modifier
  • Implied basic relationships
  • Virtual condition boundary and axis interpretation

Interpreting and Inspecting Tolerance of Position RFS and MMC Applications

  • Tolerance of position control (RFS), tolerance zone, and tolerance zone shapes
  • Worst-case boundary of a feature of size controlled with tolerance of position at RFS
  • MMC modifier used in a tolerance of position application
  • Tolerance zone in tolerance of position (MMC) applications
  • Bonus tolerance available for a tolerance of position application
  • Datum shift available in a coaxial diameter tolerance of position application
  • Legal tolerance of position specification, inspection

Functional Gages for Tolerance of Position (MMC) Applications

  • Functional and cartoon gages and benefits
  • Cartoon gage for a tolerance of position application

Interpreting and Inspecting Tolerance of Position Special Applications

  • Interpreting position - applied to non-parallel holes and not perpendicular to the datum axis, a bi-directional position application, applied to elongated holes, with the projected tolerance zone modifier, in a symmetrical relationship, with the LMC modifier
  • Inspecting a projected tolerance zone
  • Bonus tolerance in an LMC application
  • Position used to control the spacing and orientation of a hole pattern
  • M multiple single-segment position control and zero tolerance at MMC dimensioning

Interpreting and Inspecting Concentricity

  • Concentricity, tolerance zone, median point, application, and inspection
  • Concentricity compared to total runout and tolerance of position (RFS)
  • Legal concentricity specification

Interpreting and Inspecting Symmetry

  • Symmetry, tolerance zone, application, and inspection
  • Differences between symmetry and tolerance of position
  • Legal symmetry control specification

Interpreting and Inspecting Circular Runout

  • Specifying datum axis for a runout application
  • Circular runout, tolerance zone (dia.), composite control, inspection
  • Amount of axis offset from a circular runout callout
  • Worst-case boundary in a circular runout application
  • Legal circular runout control specification

Interpreting and Inspecting Total Runout

  • Total runout, tolerance zone (dia.), composite control, inspection
  • Amount of axis offset from a total runout callout
  • Worst-case boundary in a total runout application
  • Legal total runout control specification and circular vs. total runout
  • Distances on a part that uses runout

Profile Tolerancing

  • Profile tolerancing with or without datum references and true profile
  • Part characteristics that profile can affect, tolerance zone coverage, advantages
  • Bilateral and unilateral profile tolerance zones, between and all around symbols

Interpreting and Inspecting Profile of a Surface Applications

  • Tolerance zone for profile applied to planar and coplanar surfaces
  • Multiple single-segment profile application
  • Legal profile of a surface specification, inspection

Interpreting and Inspecting Profile of a Line Applications

  • Profile of a line used in a multiple single-segment control
  • Used with a coordinate tolerance
  • Inspecting profile of a line

Course summary, final learning assessment

All of ETI's instructors are industry professionals with years experience applying GD&T on the job. ETI trainers have:

  • Expert knowledge of the Y14.5 Standard
  • ASME certified and/or ASQ certified
  • Current or recent industrial experience using GD&T 
  • At least five years experience using GD&T
  • Experience and skill using ETI teaching materials

Our instructors use identical training materials and lesson plans, so you receive the same class presentation from every trainer.

Hotel & Travel Information

Fees: $1415.00
SAE Members: $1132.00 - $1274.00

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

If paying by a credit card, click the Register button above. If paying by any other method or for general inquiries, please contact SAE Customer Service 1-877-606-7323 (724-776-4970 outside the U.S. and Canada) or at

Duration: 2 Days
September 25-26, 2019 (8:30 a.m. - 4:30 p.m.) - Livonia, Michigan