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Everything I needed to know about GD&T I learned from my dog
or
GD&T for Dummies


This free online textbook makes GD&T fun and easily understandable.  I used illustrations involving dogs to keep it entertaining and because I am a dog lover.  I think you will find that GD&T is easy if presented properly.  Have fun!!!

This textbook is based on the ASME Y14.5 2009 standard.

An expanded version of this book, including 336 exercises with solutions, is available for sale in pdf format.  Click here to go to the ebook for sale

Picture

Ebook showing the significant updates in the 2018 standard vs. the 2009 standard


Video about when to use RFS, MMC, LMC
Video about Pattern Datums
Video about Unequally Disposed Profile
Video about LMC and LMB
Video about Net Hole and Slot





Table of Contents

Some Philosophy
         Dimensioning for Function

Rules, Standards, Definitions
          ASME or ISO standard
          Standard Notes
          Where GD&T does not apply
          Unequal Bilateral Size Tolerances
          Feature Control Frame
          Basic Dimensions
          Features of Size
          MMC, LMC, RFS
          Rule #1
          Actual Mating Envelope
          Free State Modifier
          Simultaneous Requirements
          Modifiers - Concise Definitions
                    Maximum Material Condition
                    Maximum Material Boundary
                    Least Material Condition
                    Least Material Boundary
                    Datum Translation Symbol
                    Maximum Material Boundary Datum Simulator
                    Basic Boundary Datum Simulator
                    Tangent Plane Modifier
                    Unequally Disposed
                    Non Uniform Profile
                    Projected Tolerance Zone
                    Statistical Tolerance
                    Free State Modifier
                    Independency Symbol
                    Continuous Feature
                    Between
                    All Around
                    All Over
                    Boundary
                    Each Element
                    Each Radial Element

Datums
          Datums introduction
          Degrees of Freedom
          Planar Datums
          Feature of Size Datums
          Datum Targets
          Advanced topic - Customized Datum Reference Frames
        
Form tolerances
          Flatness
                  Applied to a surface
                  Applied to a center plane
          Straightness
                  Applied to a surface
                  Applied to an axis
          Circularity
          Cylindricity

Orientation tolerances
          Perpendicularity
                    Applied to a surface
                    Applied to a feature of size RFS
                    Applied to a feature of size MMC       
          Parallelism
          Angularity

Location tolerances
          Tolerance of Position
                     Rules
                     Tolerance of Position RFS
                     Projected Tolerance Zone
                     Composite and multiple single segment Tolerance
                     Bonus Tolerance Introduction
                     Tolerance of Position MMC
                     Calculating whether or not a hole is in spec with bonus tolerance
                     Datum Feature Shift Introduction
                     Tolerance of Position MMC and MMB
                     Zero Tolerancing at MMC
                     Tolerance of Position at LMC and LMB
                     Six different datums derived from one datum feature
                     How Tolerance Of Position controls Perpendicularity
                     When to use RFS, MMC, and LMC
                     Datum Feature Shift relative to a pattern of holes
                     Boundaries used with Tolerance of Position
                     Locating datum features to a dash datum derived from those features
                     CMM and CAD working together for pattern datums & datum targets
                     Advanced Topic (calculations) - Are holes in spec with bonus and shift
          Concentricity
          Symmetry

Profile tolerances
           Controlling Form
           Controlling size with coordinate tolerance

           Controlling size with profile tolerance
           All around
           All over
           Unequally disposed
           Controlling orientation

           Multiple Single Segment and Composite profile
           Composite profile for planar surfaces
           Profile of a line
           Profile with datum feature shift

Runout

Some Practical Examples
           Dimensioning Features of Size - buttons on a key pad
           Dimensioning Symmetrical Widths
           Dimensioning Pipes
           Classic datum scheme for a cover
           Multiple datum reference frames on a part
           Pattern Datums
           Dimensioning the outside edges of a part
           Dimensioning slots that have draft (including how to locate)
           Tolerances between multiple DRFs with a single manufacturing set-up


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