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Geometric Dimensioning and Tolerancing in 2007

[per ASME Y14.5M-1994]

by James D. Meadows]

James D. Meadows

[per ASME Y14.5M-1994]
© 2006, Released February 2007

560 pages, illustrated / $109.00

ISBN: 0-9714401-2-3


This is the most comprehensive GD&T textbook ever written by a single author. Geometric Dimensioning and Tolerancing in 2007 has the unprecedented ability to cover almost every facet of tolerancing.   Unlike any before it, this GD&T textbook, and the course based on it, can cover all the tolerancing-related topics time allows. Time is your only limiting factor in topics to be covered in a workshop. . . but the textbook has it all!

Although based on the rules found in the ASME Y14.5M-1994 standard, it also covers topics from other recently published standards by ASME not found in older texts.  It includes step-by-step procedures for dimensioning and tolerancing parts and assemblies. It shows how to analyze the tolerances applied using both worst case and statistical analysis. This book demonstrates the connection between the application of functional geometric tolerances and its effect on manufacturability and inspection, stressing optimal ways to achieve a high-quality product at the lowest possible cost to the customer.

Chapter 1–Geometric Dimensioning and Tolerancing
Symbology, Rules and Formulas; GD&T–an Introduction

Chapter 2 – Selecting a Tolerancing Approach
Datums and Datum Features; Steps in a Tolerancing Scheme; How to Read a Feature Control Frame

Chapter 3 – True Geometric Counterparts
True Geometric Counterparts and Datum Feature Simulators; Fixtures, Gages and Virtual Condition Boundaries

Chapter 4 – Boundaries and Material Condition symbols, MMC, LMC & RFS
Geometric Dimensioning and Tolerancing Overview; Material Condition Symbols and the Boundaries they Generate

Chapter 5–Major Concepts of Geometric Dimensioning and Tolerancing
Converting from Plus and Minus to Geometric Tolerancing; Position; Gaging; Flatness; Selecting Datum Features’ Perpendicularity; Mating Part Tolerancing; Reading the Feature Control Frames as a Language; Calculating Inner and Outer Boundaries [virtual condition, resultant condition]; MMC vs. RFS vs. LMC [what they mean, when to use them, boundaries they create]; Bonus Tolerancing Formulas; Allowed versus Actual Deviation from True Position Calculations; A Difference between Bonus Tolerance (growth) and Datum Shift (movement) of Tolerance Zones

Chapter 6 – Form
Flatness; Straightness; Cylindricity; Circularity

Chapter 7 – Orientation
Overview; Parallelism; Perpendicularity; Angularity; Actual Mating Envelopes; Orientation of Centerplanes

Chapter 8 – Profile
Profile of a Surface; Profile of a Line; Composite Profile; Two Single Segment Profile; Coplanarity; Conicity

Chapter 9 – Runout
Circular Runout; Total Runout

Chapter 10 – Concentricity and Symmetry
Concentricity; Symmetry

Chapter 11 – Datums and Datum Features
More About Datums and Datum Features [How they are Selected; what they Mean]; Specifying Degrees of Freedom; Establishing a Valid Datum [Curved Surfaces as Datum Features, Datum Feature Patterns referenced at MMC or RFS, Conical Datum Features

Chapter 12 – Centerplane Datums
Centerplane Datums—an Overview; Centerplane Datums on Mating Parts

Chapter 13 – Position with Fixed Fastener Assemblies and Projected Tolerance Zones
Tolerancing Mating Parts in a Fixed Fastener Assembly for Position Tolerancing; GO Gages; Reading Feature Control Frames; Projected Tolerance Zones for Position Tolerances and How to Measure Them; Referencing Datum Features at MMC/Datum Shift and What it Means

Chapter 14 – Position with Floating Fastener Assemblies
Tolerancing Mating Parts in a Floating Fastener Assembly for Position Tolerancing; Selecting Datum Features; Two Single Segment Position Tolerancing; Calculating Tolerances and Datum Shift

Chapter 15 – Direct vs. Indirect Relationships
Accumulation of Tolerances with Multiple Datum Reference Frames

Chapter 16 – Datum Targets
Flexible Parts; Equalizing Datums; Moveable Targets; Finding the Datum Planes; Fixtures

Chapter 17 – Datum Feature Scheme Choices
Secondary and Tertiary Datum Features of Size; Datum Feature Patterns and Profile; Simultaneous Gaging Requirements; Compound Datum Features of Size

Chapter 18 – Flexible Parts
Temporary Datum Features; Restrained vs. Free State Inspection; Free State Variation in Plastic, Rubber and Sheet Metal Parts; How to Write a Restrained State Note; Fixturing Flexible Parts; Fixturing Step Datum Targets; Tolerancing Automobile Panels

Chapter 19 – Positional Boundary Concepts
Elongated Holes; Tolerancing Hoses, Pipes and Tubes; Positional Boundary Concept with Profile of a Surface; An Oddly Configured Hole as a Datum Feature and How to Gage It; Measurement of Tolerance Zones vs. Measurement of Positional Boundaries

Chapter 20 – Composite vs. Two Single Segment Positional Tolerancing
Simple and Complex Parts

Chapter 21 –
Why Use GD&T?; Floating Fastener Assemblies; Converting from Plus and Minus Tolerancing to Composite Position Tolerancing; Interpretation of Tolerance Zones; Minimum Wall Thickness Calculations; Tolerance Stack-Up Analysis

Chapter 22 – Dimensioning and Tolerancing of Gages per the ASME Y14.43-2003 Dimensioning and Tolerancing Principles for Gages and Fixtures standard –
GO Gages; NOGO Gages; Functional Gages; Absolute Gage Tolerancing; Practical Absolute Gage Tolerancing; Optimistic Gage Tolerancing; Tolerant Gage Tolerancing; Calculations that Determine the Possibility of Accepting No Bad Parts, Rejecting No Good Parts or Straddling the Line

Chapter 23 – Statistical Tolerancing and Its Specificity
How to be Specific in Calculating and Specifying Statistical Requirements for Size and Geometric Tolerancing; Symbology for SPC Formulas; Arithmetic Mean; Normal Distribution of Tolerance and the Standard Deviation; Statistical Probability for Tolerance Stack-Up Analysis for Geometric Tolerances

Chapter 24 - Tolerance Stack-Up Analysis
Fixed Fastener Assembly using Geometric Tolerances (a step-by-step tutorial); Main Rules; Calculating Gaps; Working the Route; Calculating Inner and Outer Boundary Means and their Tolerances; Numbers Charts; Calculating Statistical Tolerances; Calculating Tolerances likely to be Consumed by Manufacturing within Six Sigma; The Root Sum Square Formula; The Bender Factor; Monte Carlo Methodology; Reintegrating the Statistical Tolerance into the Assembly; Glossary of Statistical Terms

Chapter 25 – Tolerance Stack-Up Analysis Explanation for a 5-Part Rotating Assembly
Determining Pertinent Factors; Excluding Non-Pertinent Geometric Controls; Simplifying the Assembly Drawing; Graphing the Results; Determining Minimum Gaps or Maximum; Interferences in the Assembly; Wall Thickness Calculations; Choosing the Pertinent Tolerances and Boundaries for Inclusion

Single Part Analysis; Tol. Stack with Profile Tolerance and Separate Requirements; Accumulating Tolerance Error caused by Different Datum Structures

Chapter 26– Tolerance Stack-Ups Created During Manufacture of Products due to Changing Set-ups
Machine and other Manufacturing Capabilities; Trigonometric Factors

Chapter 27 – GD&T as a Language
How to Read Feature Control Frames; Switching Datums- Affects on Gaging, Fixturing and Accumulating Tolerance Error; Different Tolerancing Approaches; Datum Shift; PC Boards; Simultaneous vs. Separate Requirements; Angular Orientation; Datums; Stationary vs. Sliding Gaging Elements; Profile; Tolerance Zones and Pattern Shift; Gear Drawings; Keyways; Bonus Tolerance; Sequential Tolerancing Techniques using the Simultaneous Requirement Rule

Chapter 28 – Definitions

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