                        

Critical Concepts of Tolerance Stacks ASME Y14.5 1994, 2009, 2018 ¿ Foundational Level 




I.D. # 

ET2110 

Duration 

2 Days 










Using tolerance stacks ensures that parts fit together properly, reducing scrap and rework, thereby increasing value. This 2day foundationallevel course explains how to use tolerance stacks to analyze product designs and how to use geometric tolerances in stacks. You¿ll learn the essential methods used for creating 1D part and assembly tolerance stacks, including these six critical concepts: 1.The importance of stacks 2.The twocolumn stack method using the SAE stack spreadsheet 3.Determining a stack path 4.Creating 1D part and assembly stacks 5.Interpreting GD&T 6.Resolving assumptions and inane tolerances The course discusses how virtual condition and worstcase boundaries affect part assembly. You¿ll practice calculating part and assembly stacks using directly toleranced dimensions, runout/concentricity, equal bilateral/unilateral profile, position tolerances (RFS & MMC) with datum references at RMB and MMB, using form and orientation tolerances applied to features (surfaces) and features of size (e.g., holes, pins, slots, tabs, etc.). You¿ll also gain experience performing tolerance stacks that involve various types of geometric tolerances (e.g. runout, position, profile, etc.). Each lesson focuses on a key learning goal by giving you the opportunity to work on and master two to five specific performance objectives. The knowledge and skills acquired will enable you to increase your understanding of part function. You¿ll be able to discover and resolve problems early in the product development process rather than in prototype or production. You¿ll make more intelligent design decisions, be better able to evaluate design proposals and change requests, and have an increased understanding of GD&T. Each participant should bring a laptop with Excel and Powerpoint, to utilize the Tolerance Stacks spreadsheet. Each participant receives:  A copy of the Critical Concepts of Tolerance Stacks Course Book (includes drawing package, exercises, and answers) PDF or print
 A SAE Tolerance Stacks Calculation Workbook
 A SAE PowerPoint Tolerance Stacks Path Workbook
 A SAE Tolerance Stacks Spreadsheet to use on the job
 A Tolerance Stacks Summary Chart PDF
 A Y14.5 1982 / 1994 / 2009 / 2018 Effects on Tolerance Analysis Comparison Chart PDF
The course features more than 25 practice problems and indepth coverage of tolerance stacks applications based on the ASME Y14.5 Standard.














































Learning Objectives 


After completing this foundationallevel course, you¿ll be able to:  Describe how virtual conditions and worstcase boundaries affect the assembly of parts
 Explain the importance of tolerance stacks and be familiar with the SAE 1D twocolumn limit stack methods and the SAE tolerance stack spreadsheet
 Calculate part stacks using directly toleranced dimensions, runout and concentricity tolerances, equal bilateral and unilateral profile tolerances, multiple geometric tolerances, position tolerances at RFS and MMC with datum features referenced at RMB and MMB
 Calculate assembly stacks using directly toleranced dimensions, runout and concentricity tolerances, equal bilateral and unilateral profile tolerances, multiple geometric tolerances, position tolerances at RFS and MMC with datum features referenced at RMB and MMB
 Calculate stacks using form and orientation tolerances applied to features (surfaces) and features of size (e.g., holes, pins, tabs, slots, etc.)


















Who Should Attend 


This course is valuable for product designers, engineers, and checkers responsible for the fit and function of the product. Gage designers; process and manufacturing engineers; supplier quality engineers/professionals; inspectors; and technicians will also benefit from this course.







Prerequisites 


Participants should have a good understanding of GD&T based on their applicable ASME Y14.5 Standard, either through work experience or knowledge gained by participating in a course, such as our Fundamentals of GD&T instructorled or eLearning training.







Seminar Content 


DAY ONE  Introduction
Gearbox Overview  Major gearbox functions
 Terms and concepts
Virtual Condition/WorstCase Boundary Concepts  Concepts/calculations
 Clearance/interference between mating part features
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
 Importance of design goals
 Fivestep part stack process
SAE Stack Spreadsheet  Major parts of the stack spreadsheet
 Stack summary chart and abbreviations
 Benefits and features of the spreadsheet
Part Stacks Using Directly Toleranced Dimensions  Applying the fivestep stack method
 Stack path vector loop for part stacks
 Calculating part stacks
 Shortcomings of using directly toleranced dimensions and their impact on stacks
Part Stacks Using Runout and Concentricity Tolerances  Stack vector loop between coaxial diameters
 Entering runout tolerances in the stack spreadsheet
 Part stacks using runout tolerances
 Similarities between calculating concentricity and runout tolerances in a tolerance stack
Part Stacks Using Profile tolerances  Stack vector loop using profile tolerances
 Assembly stacks using equal bilateral and unilateral profile tolerances
Part Stacks Using Position Tolerances at RFS  Stack vector loop using position tolerances
 Entering position tolerances at RFS and basic dimensions in the stack spreadsheet
 Part stacks using position tolerances at RFS and datum features referenced at RMB
Part Stacks Using Position Tolerances at MMC  Stack vector loop using position tolerances
 Entering position tolerances at MMC and basic dimensions in the stack spreadsheet
 Bonus tolerances
 Part stacks using position tolerances at MMC and datum features referenced at RMB
Part Stacks Using Position Tolerances with Datum Features Referenced at MMB ¿ Basics of Datum Feature Shift  Recognizing the impact of datum feature shift on stacks
 Stack path on a part with position tolerances at MMC and datum features referenced at MMB
 Entering datum feature shift tolerances in the correct columns on the stacks spreadsheet
DAY TWO Part Stacks Using Position Tolerances with Datum Features Referenced at MMB ¿ Datum Feature Shift Exceptions
 Recognizing the four cases where datum feature shift does not apply in a stack
 Calculating stacks on a part with position tolerances where datum feature shift is not applicable
Part Stacks Using Multiple Geometric Tolerances  Stack vector loop using multiple geometric tolerances
 Part stacks using various types of geometric tolerances (e.g., position, runout, and profile tolerances)
Assembly Stacks Using Directly Toleranced Dimensions  Sixstep assembly stack process
 Stack vector loop for assembly stacks
 Calculating assembly stacks
Assembly Stacks Using Runout Tolerances  Stack vector loop between coaxial diameters
 Assembly stacks using circular and total runout tolerances
Assembly Stacks Using Profile Tolerances  Stack vector loop using profile tolerances
 Assembly stacks using equal bilateral and unilateral profile tolerances
Assembly Stacks Using Position Tolerances at MMC and Datum Features Referenced at MMB  Stack vector loop using position tolerances
 Assembly stacks using position tolerances at MMC and datum features referenced at MMB
Assembly Stacks Using Form and Orientation Tolerances Applied to Features (Surfaces)  Stack vector loop using form tolerances
 'To and Thru' rule
 'Adjacent or Offset' rule
 Assembly stacks using straightness and flatness tolerances applied to surfaces
 Assembly stacks using perpendicularity and parallelism applied to surfaces
Assembly Stacks Using Form and Orientation Tolerances Applied to Features of Size  Stack vector loop using form and orientation tolerances applied to features of size
 Assembly stacks using flatness and straightness tolerances applied to features of size
 Assembly stacks using perpendicularity applied to features of size
Assembly Stacks Using Multiple Geometric Tolerances  Stack vector loop using multiple geometric tolerances
 Assembly stacks using various types of geometric tolerances (e.g., position, runout, and profile tolerances)
Course Summary  The six critical concepts of tolerance stacks
 Course assessment
This course contains more than 25 tolerance stacks practice exercises.























































































Instructor(s): 

Jim Beary, JohnPaul Belanger, Evan Kessick, Ming Li, Dale MacPherson, Curtis Pawlowski, Harry Taylor,




























All SAE GD&T instructors are industry professionals with years of experience applying geometric dimensioning and tolerancing on the job. Our instructors:  Have expert knowledge of the Y14.5 Standard
 Are ASME and/or ASQ certified
 Have current or recent industrial experience using GD&T¿
 Possess at least five years of experience using GD&T
 Are experienced and skilled using SAE teaching materials
SAE instructors use identical training materials and lesson plans, so you receive the same class presentation from every trainer.













Fees: 

$1299 

SAE Members: 

$1169 














CEU 

1.3 




