Intermediate SmartGD&T™for Design, Manfacturing & Inspection
Intermediate SmartGD&T™ for Design, Manufacturing & Inspection

(Available for ASME Y14.5 and ISO 1101)


Upon completion of the course, students will be able to:

  1. Encode and decode (i.e. read, not interpret) GD&T drawings in order to
    1. Assess design functionality
    2. Communicate design objectives
    3. Plan manufacturing and inspection processes
  2. Understand and apply the concepts, tools and rules for:
    1. Datum Reference Frame definition and construction
    2. Tolerance zone size, shape, orientation and location specification
  3. Visualize the pathology of real objects and how such pathology can be:
    1. Limited by the application of GD&T
    2. Controlled by well conceived manufacturing processes
    3. Assessed with coordinate measuring machines or other inspection tools

To achieve the above objectives, this course provides extensive exercises in decoding Feature Control Frames, in visualizing tolerance zones, and early insights into determining and using the "Virtual Condition" in design and inspection. In addition, it includes the first steps in learning to encode GD&T drawings and therefore serves as preparation for the course: "Advanced GD&T for Design". Although based primarily on universal part examples, the last half day of class is dedicated to analyzing drawings and parts submitted by participants.


This course is delivered in three days, providing adequate time for hands-on implementation of concepts with real objects and extensive encoding and decoding exercises.

Target Audience:

All persons dealing with Product Design, Drafting, Tool Design and Maintenance, Machining, Manufacturing, Manufacturing Management, Manufacturing Process Control, Inspection, Metrology, Robotic and manual Assembly, Vendor Relations and Purchasing.


Participation in the Smart GD&T course "Introduction to GD&T" or equivalent, and working familiarity with "blue prints" and manufacturing concepts and processes.


Course handouts include the Intermediate GD&T for Design, Manufacturing & Inspection course manual and sundry articles and flyers. Participants are encouraged to provide their own lined pads , pencils (making it easy to erase occasional mistakes), and pocket calculators. A personal or company owned copy of the ASME Y14.5M 1994 (or ISO 1101) standard should be brought to each session.


In the case of in-house corporate classes, a non-disclosure agreement should be implemented between the sponsor and Multi Metrics, Inc. prior to inception. Drawings and parts brought to public classes should be non-proprietary in nature.


Day 1:

  • What is GD&T?
  • Perfect Geometry: Coordinate Systems and Geometric Entities
  • The Transition from Classical to GD&T Tolerancing Tools
  • An overview of GD&T concepts, tools and rules, including BASIC dimensions, geometric characteristics and their associated tolerancing symbols, Feature Control Frames, tolerance zones, Datum Features, Datum Targets, Datum Feature Simulators, Datums and Datum Reference Frames, the concept of Size and the Envelope Rule, the concept of Material Condition, Material Condition modifiers, the Virtual Condition, Feature Control Frame reading.

Day 2:

  • Controlling and assessing Size
  • Controlling and assessing Form (Flatness, Straightness, Roundness, Cylindricity)
  • In-depth skill building in defining and constructing Datum Reference Frames, including Datum Feature selection, the Rules of Datum Feature Simulator Control, the Rules of Natural Datum Reference Frame construction with extensive exercises,
  • Controlling and assessing Orientation (Parallelism, Perpendicularity, Angularity)

Day 3:

  • Controlling and assessing Location in the case of Features without Size (Surface Profile, Section Profile, Dimension Origin)
  • Controlling and assessing Location in the case of Features with Size (Position, Concentricity, Symmetry)
  • Discussion and analysis of participants' drawings
  • Grand Review
  • Special Topics as time allows: the Projection Modifier, the Tangent Plane Modifier, the Free State Modifier, Bilateral Position Tolerancing, Composite Feature Control Frames.

Copyright © 2013 by Multi Metrics, Inc., Menlo Park, CA 94025   All Rights Reserved Back to Top