Fundamentals of Geometric Dimensioning & Tolerancing (GD&T) Web Seminar RePlay
Geometric dimensioning and tolerancing (GD&T) is used as a symbolic way of showing specific tolerances on drawings. GD&T is a valuable tool that effectively communicates the design intent to manufacturing and inspection. It is governed by the technical standard ASME Y14.5-2018 (recently revised from the 2009 edition). This course introduces participants to the GD&T system, providing 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 – – most notably, the deletion of concentricity and symmetry. The material is reinforced with many practice exercises.
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This course is ideal for anyone who has a need to apply or interpret geometric tolerances on a product print. Product engineers, manufacturing engineers, CAD designers, quality inspectors, and other engineering and manufacturing personnel will all benefit from a better understanding of design requirements; improved communication with customers and suppliers; and improving designs by taking advantage of bonus tolerance and other GD&T benefits. Participants should have an understanding of basic blueprint reading.
What will you learn
- 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 and inspection
Course structure
Session 1
- Why Use GD&T?
- Review of traditional dimensioning
- Benefits of GD&T
- Technical standards
- Definitions
- Basic dimensions
- How to read the feature control frame
- Rule #1: Size controls form
Session 2
- Rules and the Form Symbols
- Rule #2: Assume RFS
- Flatness
- Surface straightness
- Circularity
- Cylindricity
- GD&T applied to a feature of size
- MMC modifier and „bonus tolerance“
- Virtual condition
Session 3
- Datums
- Datum vs. datum feature
- Proper ways to label the datum feature
- The datum reference frame
- Primary, secondary, and tertiary datums
- Datums modified with „M“ (MMB)
- Datum targets
Session 4
- Position Tolerance
- Definition of „true position“
- Simple example of position on hole/pin
- Using the MMC or LMC modifiers
- The „boundary“ concept
- Position on screw threads; pitch diameter rule
- Projected tolerance zone
- Composite position tolerancing on a pattern
Session 5
- Profile and Orientation
- General definition of profile
- Profile of a line
- Profile of a surface
- Use of datums with profile
- Perpendicularity
- Angularity
- Parallelism
Session 6
- Symmetry and Coaxial Controls
- Concentricity (and why it\’s been deleted in Y14.5)
- Symmetry (and why it\’s been deleted in Y14.5)
- Circular runout
- Total runout
- Application of GD&T to a real-world part
- Inspection and gaging of GD&T callouts
- Wrap-up
- 90 days of online single-user access (from date of purchase)
- 16 hours of instructor-delivered content
- Course workbook (downloadable, .pdf\’s)
- Online learning assessment
- Instructor follow up to your content questions
- 1.6 CEUs* (upon completion of all course modules and satisfactory assessment score)
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