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Fundamentals
of GD&T Web-Based Training
Based on ASME Y14.5M-1994
Module 1: Intro, Terms, Symbols, Modifiers, Rules
Goals and Objectives
Lesson
1: Dimensions and Drawings
Goal: Understand what dimensioning and tolerancing
is.
- Describe what
a dimension is.
- Describe what
a tolerance is.
- Describe what
a limit tolerance is.
- Describe what
a plus-minus tolerance is.
- Identify the
nominal of a dimension.
- Explain how dimensional
limits are interpreted.
- Explain what
the geometric dimensioning and tolerancing system is.
- Explain "ASME Y14.5M-1994."
- Identify the three major benefits of geometric dimensioning and tolerancing.
Lesson
2: Key Terms
Goal: Understand seven key terms used in geometric
tolerancing.
- Define a feature.
- Define a feature
of size.
- Define actual
local size.
- Define actual
mating envelope.
- Describe the
maximum material condition of a feature of size.
- Describe the
least material condition of a feature of size.
- Describe the term "regardless of feature size."
Lesson
3: Modifiers and Symbols
Goal: Understand the modifiers and symbols used
in geometric tolerancing.
- Name the fourteen
geometric characteristic symbols.
- Identify the
five types of geometric characteristic symbols.
- Identify the
six common modifying symbols used in geometric tolerancing.
- Identify the
parts of a feature control frame.
- Identify the ten additional symbols used in geometric tolerancing.
Lesson
4: GD&T Rules
Goal: Understand Rule #1 and Rule #2.
- Explain Rule
#1.
- Recognize the
three components of the envelope principle.
- Determine when
Rule #1 applies to a dimension.
- Describe the
Rule #1 envelope boundary.
- Describe a limitation
of Rule #1.
- List two ways
Rule #1 can be overridden.
- Explain Rule #2 and Rule #2a.
Lesson
5: GD&T Concepts
Goal: Understand the concepts of basic dimensions,
worst-case boundary, virtual condition, inner and outer boundary, and
bonus tolerance.
- Describe a basic
dimension.
- List two uses
for basic dimensions.
- Explain the term
"worst-case boundary."
- Explain the concept
of virtual condition.
- Calculate the
virtual condition of a feature of size.
- Explain the concepts
of inner boundary and outer boundary.
- Explain the concept
of bonus tolerance.
- Calculate the amount of bonus tolerance permissible.