Tec-Ease, Inc.

Why buy two textbooks when one will do the job? 

The GD&T Hierarchy textbook is intended to aid in the instruction of Geometric Dimensioning and Tolerancing (GD&T) in accordance with the ASME Y14.5-2009 standard as well as the ASME Y14.5M-1994.  Where a concept is new to the 2009 revision of the Standard it has a shaded background.  Coverage also includes selected topics from ASME Y14.41.

This full color text is in landscape format which made it possible to include more complex drawings than are usually found in a GD&T text. There are over 200 pages with many illustrations of drawings and solid models of actual parts drawn from industry.  In addition to containing the rules, terms and definitions of GD&T, this text makes exclusive use of the GD&T Hierarchy to explain the relationship between tolerances and to guide the reader to the most appropriate applications.

Highlights of the text include:
•    Numerous Rules of Thumb
•    Overlays to illustrate concepts
•    Flowcharts
•    Dynamic tolerancing diagrams
•    Former practices
 
Table of Contents:

Chapter 1 - Introduction and Course Objectives Why GD&T Hierarchy? 

• Introduction - Geometric Shapes 

• Multi-functional Design Team     

• What Is GD&T?         

• Geometric Tolerances  

• Evolution of Engineering Drawings     

• Basic Dimensions

• GD&T Symbols     

• Statistical Tolerancing     

• The GD&T Hierarchy     

• Actual Envelopes     

• Features of Size

• Irregular Features of Size     

• Material Condition Modifiers     

• The Feature Control Frame  

• Boundaries  

• Individual Feature of Size, Rule #1  

• Continuous Feature  

• Independency Symbol  

• Virtual Condition  

• Applicability of Modifiers

• Screw Thread Rule

• Some Inspection Terms

• Degrees of Freedom 

• Datum Feature Simulators 

• Degrees of Freedom Chart  

• Datum Precedence       

• Multiple Datum Features  

• Datum Feature Selection

• Datums Must Be of Sufficient Size!

• Affect of Modifiers 

• Rotational Constraint

• Datum Translation,

• Irregular features of Size as Datum Features  

• Simultaneous Requirements

• Restraint Clarified

• Datum Targets  

• Movable Datum Targets  

• The Coordinate System 

• Labeling the Coordinate System  

• Degrees of Freedom

• Customized Datum Reference Frame

• Mathematically Defined Surface  

• Clarifying Applicable Boundaries

• Repetitive Patterns of Features

• Flatness 

• Flatness Applied to a Size Dimension

• Former Practice 

• Sample Inspection    

• Straightness

• Sample Inspection

• Circularity

• Sample Inspection

• Cylindricity

• Sample Inspection

• Perpendicularity

• Sample Inspection

• Parallelism

• Sample Inspection

• Angularity

• Sample Inspection

• When to Use Orientation Controls 

• One Orientation Symbol

• Tangent Plane

• Profile as a General Requirement

• Application Options for Profile Summarized     

• Unequally Disposed Profile

• Unilateral Profile Tolerance

• Composite Profile Tolerancing

• Combined Controls

• Coplanarity  

• Non-Uniform Zone  

• Profile per Unit Length  

• Sample Inspection of Profile

• Position

• Surface Interpretation  

• Pattern Location

• Composite Position Tolerancing

• Inspecting Position

• Projected Tolerance Zone

• Symmetry

• Sample Inspection

• Position

• Sample Inspection

• Concentricity

• Sample Inspection

• FIM (Full Indicator Movement)

• Runout

• Sample Inspection

• Runout Summary

• Profile Controlling Coaxiality

• Sample Inspection