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What is GD&T?

An engineering drawing serves as the common thread between design, procurement, manufacturing and quality. It is imperative that the complete design intent be portrayed as clearly as possible within the document. An important aspect of a design is to define the allowable variation in form allowed.

Geometric Dimensioning and Tolerancing (GD&T) is a language used on engineering drawings that's composed of symbols. GD&T, as well as the other rules levied by the American Society of Mechanical Engineers ASME Y14.5, helps remove the ambiguity which is inherent to many drawings within the United States.

By understanding the following geometric controls as applied to the characteristics of size, form orientation and location, you can enhance your knowledge and skills to communicate effectively.

Form: Straightness, Flatness, Cylindricity, Circularity
Runout: Circular & Total
Orientation: Angularity, Perpendicularity, Parallelism
Profile: Profile of a Surface & Profile of Line
Position: Single, Multi-segment & Composite Feature Control Frames

The following courses are designed to assist with improving engineering products and inspection activities.

Instructor: Our instructor is certified by the American Society of Mechanical Engineers (ASME) as a Senior Geometric Dimensioning & Tolerancing Professional (GDTP).

GD&T Courses - Click for details

GD&T Fundamentals

Updated to 26-hours, this course provides a thorough introduction to Geometric Dimensioning & Tolerancing (GD&T) for those with little or moderate levels of experience with GD&T. It covers definitions, concepts & language in ASME Y14.5-2009, Dimensioning and Tolerancing. This course is designed for anyone who designs, drafts, engineers, manufactures, estimates, or inspects parts to engineering drawings. Particular emphasis is placed on topics applicable for those who design, manufacture, and are responsible for quality assurance.

The goal is to bring participants to an operational level of understanding GD&T by studying the rules and geometric controls in ASME Y14.5.

Also covered is an introduction to Datum Reference Frames, inspections gauges and Material Condition Modifiers.

Textbooks: "GD&T Application and Interpretation" by Bruce A Wilson, Sixth Edition.

Major Topics:

  • ASME Y14.5-200- Format & Content
  • Fundamental Rules and Rule #1
  • Tolerances of Form
  • Tolerances of Orientation
  • Tolerances of Location
  • Datum Reference Frames
  • Tolerances of Runout
  • Tolerances of Profile
  • Material Condition Modifiers
  • MMSC Virtual Conditions

GD&T Intermediary

This course gives participants who already possess a solid level of skill with the Fundamentals of GD&T, an enhanced exposure to the Intermediate level of geometric controls within ASME &14.5-2009. The course begins with a brief review of the fundamentals of GD&T. New concepts include expanded investigation into Datum theory. Also covered is the emphasis on composite feature control frames for position and profile.

Textbooks: "GD&T Application and Interpretation" by Bruce A Wilson, Sixth Edition.

Major Topics:

  • Composite FCF-Profile of a Surface
  • Composite FCF-Position
  • Datum Features of Size
  • Datum Feature Shift
  • Multi Segment FCFs
  • MMC & LMC Virtual Conditions
  • Actual Mating & Minimum Material Envelopes
  • Resultant Condition Boundaries
  • Datum Targets
  • Datum Patterns

Applications of GD&T

This course gives participants with an intermediate level of skill with GD&T, an enhanced exposure to the application of the geometric controls to mechanical drawings, and by extension, digital definition products. Brief review of both the fundamentals and intermediate level controls of GD&T.

The majority of the class time will focus on applying the proper geometric controls to sample drawings and examining the associated datum reference frames, tolerance zones, the LMC and the MMC Virtual conditions, the resultant condition boundaries and wall thickness calculations. Concepts covered include fixed and floating fastener conditions, multi-segment and composite feature control frames, datum features of size, datum feature shift and datum targets.

Textbooks: "GD&T Application and Interpretation" by Bruce A Wilson, Sixth Edition.

Major Topics:

  • Composite FCF-Profile of a Surface
  • Composite FCF-Position
  • Datum Features of Size
  • Datum Feature Shift
  • MMC & LMC Virtual Conditions
  • Datum Targets
  • Resultant Condition Boundaries
  • Drawing Applications 

 

 

Contact Us

EFSC-Workforce Training
1519 Clearlake Rd
Cocoa, FL 32922
Patty Boatman
boatmanp@easternflorida.edu
321-433-7514 or 321-433-7500
Fax: 321-433-7525

Check Dates & Register

Click through for Geometric Dimensioning and Tolerancing (GD&T) course dates, fees and registration. In the event that two fees are listed for the same class, the higher fee will include the book listed. Students continuing to the next course level that lists the same textbook will not have to purchase the book again if they already own it.