GD&T – Comprehensive

Engineering Design Courses
  • Course:GD&T – Comprehensive
  • Course ID:GDT3D Duration:3 days Where: Your Office (7+ Persons)
  • Available as a private, customized course for your group at your offices or ours and in some cases as a WebLive(TM) class.

  • Download Course Description (PDF)

Course Outline

  • Drawings and Dimensioning

    • Importance of engineering drawings
    • Fundamental dimensioning rules: 2D and 3D applications
    • Review of coordinate dimensioning and tolerancing
    • History of GD&T and its benefits
    • Quality issues: How GD&T fits into other standards
    • The current GD&T standard: ASME Y14.5-2009 (as of this outline)
  • Introduction to GD&T Symbols and Terms

    • Definitions: Feature of size, actual local size, actual mating envelope
    • Material conditions: MMC, LMC, RFS
    • Radius and controlled radius
    • Reading a feature control frame
  • Rules and Concepts of GD&T

    • Rule #1: Size controls form
    • Inspecting a part for size limits
    • Rule #2: Implied RFS
    • Bonus tolerance
    • Virtual condition
    • Gaging GD&T: Fixtures, special gages, CMMs
  • Form Tolerances

    • Flatness applied to a surface
    • Straightness applied to a surface
    • Circularity
    • Cylindricity
    • Flatness and straightness applied to a feature of size
    • Per-unit form control
  • Datums

    • Purpose of datums in GD&T
    • Datum vs. datum feature
    • Single planar datum example
    • The datum reference frame
    • Feature-of-size datums
    • Compound datum features
    • Datum targets
    • How to select datums for a part
    • Simulating datums on fixtures and CMMs
  • Profile Tolerances

    • General definition of profile
    • Profile of a line
    • Profile of a surface
    • Profile with datum references
    • Composite profile control
    • Tolerance stacks; calculating min/max wall thickness
  • Orientation Tolerances

    • Perpendicularity
    • Controlling an angle with a linear tolerance
    • Angularity
    • Parallelism
    • The tangent plane modifier
    • Profile used as an orientation control
    • The pitch diameter rule
  • Location Tolerances

    • Location control with coordinate tolerances
    • Definition of “true position”
    • Application of position RFS
    • Using the MMC and LMC modifiers
    • Application of MMB and RMB on datum references
    • Inspecting parts for position
    • Composite position control
    • Two-single-segment position control
    • Projected tolerance zone
    • Calculating tolerance values; fixed and floating fasteners
    • Concentricity; why it is not recommended
    • Symmetry
  • Runout Tolerances

    • Definition of runout: TIR, FIM, and coaxiality
    • The difference between runout and other circular controls
    • Circular runout
    • Total runout
  • Wrap-up and Review of Drawings

    • Comparison with the 1994 standard
    •  Discussion of capability and statistics within GD&T
    •  Proper tolerancing strategies
    •  Review sample drawings
    •  Evaluations