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ETI Professional Development Seminars

Critical Concepts of Tolerance Stacks 2-Day
(Based on ASME Y14.5-2009)

Course ID # ET1701
Duration: 2 Days

November 6-7, 2018 (8:30 am - 4:30 pm) - Livonia, Michigan Register Now

Online registration redirects to the SAE International website. (Learn more.)

This two-day course provides an in-depth explanation of how to use tolerance stacks to analyze product designs and how to use geometric tolerances in stacks. You will learn the essential methods and concepts used for creating 1D part and assembly tolerance stacks. The course was developed utilizing the expertise of world-renowned GD&T expert Alex Krulikowski and features numerous practice problems and in-depth coverage of tolerance stacks applications.

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

Each attendee receives a robust collection of learning resources including:

  • A copy of Critical Concepts of the Tolerance Stacks Course Book
  • A Critical Concepts of Tolerance Stacks Exercise Workbook
  • A Tolerance Stacks Drawing Package
  • A tolerance stack Excel spreadsheet template
  • A Tolerance Stacks Summary Chart
  • A Y14.5-1982 / 1994 / 2009 Effects on Tolerance Analysis comparison chart

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.

After successfully completing this class, you will be able to:

  • Describe how virtual condition affects the assembly of parts
  • Explain the importance of tolerance stacks and be familiar with the stack methods, the stack form, and the stack spreadsheet
  • Calculate part stacks stacks using coordinate dimensions, runout and concentricity, bilateral and unilateral profile tolerances, multiple geometric tolerances, position tolerances at RFS and MMC/MMB
  • Calculate assembly stacks using coordinate dimensions, runout and concentricity, bilateral and unilateral profile tolerances, multiple geometric tolerances, position tolerances at MMC/MMB
  • Calculate stacks using form and orientation applied to features and features of size

Who Should Attend
This course isvaluable for individuals who create or interpret engineering drawings; product and gage designers; process, product, and manufacturing engineers; supplier quality engineers/professionals; CMM operators; and checkers.

In order to understand the course content, students should have a good understanding of GD&T based on the ASME Y14.5-2009 Standard either through work experience or knowledge gained by participating in a course such as  the ETI Fundamentals of GD&T 3-Day Workshop.  Basic GD&T concepts will not be covered in this course.

Topical Outline


Introduction to Tolerance Stacks

  • Stack definition
  • Importance/purpose/benefits of stacks
  • When stacks should be calculated

Introduction to 1D Stack Methods

  • Definition and stack conventions
  • Effects of rounding
  • Five basic stack steps
  • Virtual condition concepts, calculation, clearance/interference between mating part features

ETI Stack Form and Spreadsheet

  • Major parts of the stack form
  • Stack abbreviations
  • Use and limitations of the spreadsheet

Part Stacks Using:

  • Coordinate dimensions
  • Runout tolerances
  • Profile tolerances
  • Position tolerances at RFS
  • Position tolerances at MMC
  • Position tolerances at MMB - basics of datum feature shift


Part Stacks Using (continued):

  • Position tolerances at MMB - datum feature shift exceptions
  • Multiple geometric tolerances

Assembly Stacks Using:

  • Coordinate dimensions
  • Runout tolerances
  • Profile tolerances
  • Position tolerances at MMC/MMB
  • Form and orientation tolerances applied to surfaces and features of size
  • Multiple geometric tolerances

Course Summary

  • The six critical concepts of tolerance stacks
  • Course 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.

Critical Concepts of Tolerance Stacks 2-Day
ID # ET1701

Fee: $1280; SAE Members*: $1024-$1152

* The appropriate SAE Member discount will be applied through the registration process. Discounts vary according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%

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

Quantity discounts available. ETI offers a 10% discount on three or more registrations. Call for more information.

See our locations in Livonia and Troy, Michigan.

About ETI's Registration Process
To register for this seminar, click the Register button at the top of this page. You will be redirected to the SAE International customer portal for final payment. New SAE customer registration is required.
To register by telephone, contact SAE International Customer Service at 1.877.606.7323 (U.S. and Canada only) or 1.724.776.4970 (Outside U.S. and Canada).
Effective Training Inc. (ETI) is an SAE International company.

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This file last modified 07/23/18