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The GD&T Hierarchy (Y14.5 1994)

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Geometric dimensioning and tolerancing is not new, but there is a newness about it. Over a career of 30 years, Don Day continuously worked to develop this 160 page seminar text. The result is a tool that facilitates and maximizes learning. The entire text is in landscape format which makes it possible to include more complex drawings than are usually found in GD&T texts. Many of the illustrations are solid models of actual parts including some from Don's own product, the Inter-Mec Air Clutch Brake.

The GD&T Hierarchy
by Don Day

The GD&T Hierarchy is used throughout the book to illustrate relationships between the 14 geometric tolerances. The book walks you through a brief history of engineering drawings. Then goes on to prove how it is not possible to utilize the latest developments in solid modeling, computer aided manufacturing and automated inspection without GD&T. The most usable geometric tolerances are featured with numerous application examples.
Highlights of the text include:
  • Numerous Rules of Thumb
  • Overlays to illustrate concepts
  • Flowcharts
  • Dynamic tolerancing diagrams
Content Summary:
Chapter 1: Introduction Chapter 2: Features
  • Course Objectives
  • Introduction - Geometric Shapes
  • Multi-functional Design Team
  • Time for Drawing Previews!
  • What is GD&T?
  • Boundaries
  • Feature Control Frame
  • The GD&T Hierarchy
  • GD&T is as easy as 1-2-3
  • Features of Size
  • Finding an Axis or Center Plane
  • MMC, LMC, RFS
  • Individual Feature of Size (Rule #1)
  • Rule #2
  • Screw Thread Rule
  • Virtual Condition
  • Free State
Chapter 3: Datums Chapter 4: Form
  • Six Degrees of Freedom
  • Datums, Datum Features and Simulators
  • Datum Axis
  • Datum Center Plane
  • Datum Symbol Placement
  • Datum Precedence
  • Datum Targets
  • Datum Guidelines
  • Virtual Condition
  • Free State
  • Flatness
  • Surface Straightness
  • Straightness Applied to a Size
  • Dimension
  • Circularity (Roundness)
  • Cylindricity
Chapter 5: Orientation Chapter 6: Profile
  • Perpendicularity
  • Parallelism
  • Angularity
  • Tangent Plane
  • Profile Tolerance Zones
  • Composite Profile Tolerancing
  • Coplanarity
  • Applications
Chapter 7: Position Chapter 8: Coaxial Features
  • Composite Position
  • Implied Conditions
  • Symmetry
  • A Comparison
  • Runout
  • Concentricity
Chapter 9: Fixed and Floating Fasteners
  • Floating Fastener
  • Fixed Fastener
  • Projected Tolerance Zone