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Geometric Dimensioning and Tolerancing (GD&T)

August 14, 8:00 am - August 16, 4:00 pm



GD&T is a tool that effectively communicates the design intent for manufacturing and inspection. It is governed by the technical standard ASME Y14.5M-2009. The course introduces participants to the GD&T methodology. The course provides a working knowledge of the correct interpretation and application of each symbol, general rules, the datum system, and ‘bonus’ tolerance and highlighting some of the changes in the updated Y14.5 standard. The material is reinforced with some practical exercises.

Learning Objectives

  • Explain the benefits of geometric tolerancing
  • Identify datum features and determine their order of precedence
  • Identify and interpret each of the characteristic symbols
  • Describe the material condition modifiers and how “bonus” tolerance occurs
  • Correctly interpret GD&T feature control frames, and explain the impact on manufacturing

Course Content:

Introduction to GD&T

Drawing History

GD&T Definition and the Future

ASME Y14.5-2009 Structure

Lesson 1 – Dimensioning & Tolerancing

  • Abbreviations, Terms and Concepts
  • Dimensioning & Tolerancing standard practices

Lesson 2 – Tolerances of Form

  • Straightness, Flatness, Circularity (Roundness) and Cylindricity

Lesson 3 – Tolerances of Orientation

  • Parallelism, Perpendicularity, Angularity

Lesson 4 – Tolerances of Runout

  • Circular Runout and Total Runout

Lesson 5 – Tolerances of Profile

  • Profile of a Line and Profile of a Surface

Lesson 6 – Tolerances of Location

  • Position, Concentricity and Symmetry

Lesson 7 – Tolerances of Location – Position

  • Positional Tolerances with Bonus (MMC, LMC)

Lesson 8 – Tolerance of Location – Position (cont.)

  • Composite Position / Positional Tolerance


August 14, 8:00 am
August 16, 4:00 pm
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SCMEP Greenville
250 Executive Center Drive, Suite 200
Greenville,SC29615United States
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