Geometric Dimensioning and Tolerancing  (GD&T)
Basic to Intermediate Level
Gregory S. Gay

Why This Seminar?

More and more enterprises are adding GD&T requirements to their conventionally toleranced engineering drawings, necessitating training of this type.  An understanding of GD&T is required in order to correctly interpret these GD&T controlled engineering drawings. 

The basics of GD&T will be reviewed.  Included will be some hands-on examples of measuring of part features using the application of GD&T principals.  Starting with basic print reading knowledge, the seminar will cover the symbols, terminology and rules of GD&T as based on the current version of the standard ASME Y14.5M-1994.

Audience

This seminar is designed for inspectors, quality technicians, quality engineers, machinists, manufacturing engineers, their supervisors and managers, and others interested in a greater understanding of engineering drawings with GD&T specifications.  The seminar is presented from the perspective of an inspector.  Attendees should have an understanding of conventional engineering drawings, but prior knowledge of GD&T is not required.

Learning Outcomes

Upon completion of the seminar, participants will be able to:

 Identify datums and their use
 Understand the relationship of size dimensions to the form of the part
  Interpret feature control frames
 Compute Maximum Material Condition (MMC) & Least Material Condition (LMC) values
 Compute positional tolerance zones including use of bonus tolerancing
 Design simple MMC gages under GD&T control
 Interpret the five general rules of GD&T
 Inspect to composite positional tolerancing requirements
 Apply graphical inspection analysis to GD&T control

Outline

      1.       Dimensioning and Tolerancing - Millimeters - Inch - Angle
 2.       Fundamental Dimensioning Rules
 3.       MMC
 4.       LMC
 5.       Extreme Form Variation
 6.       Basic Fits
 7.       Alternate Dimensioning Practices
 8.       Geometric Characteristic Symbols and Terms
 9.       Feature Control Frames and Basic Dimensions
10.    Datums and Datum Reference Frame Concept
11.    Material Condition Symbols – MMC, LMC and RFS
12.    Perfect Form Boundary
13.    Tolerance of Form and Profile
14.    Tolerance of Orientation and Run-out
15.    Locational Tolerances & Bonus Tolerancing
16.    Comparison Between Conventional and Positional Tolerancing
17.    Zero Positional Tolerance at MMC
18.    Virtual Condition Concept
19.    Use of GD&T with Gages and Graphical Inspection Analysis
20.    Concept of a MMC Hole to Another MMC Hole
21.    Concept of a MMC Hole to a RFS Hole

 
Handouts

  A GD&T text book
 Fundamental Dimensioning Rules
Certificate of Completion, with 1.5 Continuing Education Units