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Fundamentals
of GD&T Web-Based Training
Based on ASME Y14.5M-1994
Complete Course 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.
Lesson
6: Flatness
Goal: Interpret the flatness control.
- Describe what
flatness is.
- Describe the
tolerance zone for a flatness control.
- Describe which
modifiers can be used in a flatness control.
- Identify the
three requirements in a flatness application.
- Describe how
Rule #1 provides an indirect flatness control.
- Describe two
common applications for a flatness control.
- Describe how a flatness control can be inspected.
Lesson
7: Straightness
Goal: Interpret the straightness control.
- Describe the
difference between derived median line and axis.
- Describe the
difference between derived median plane and centerplane.
- Describe what
straightness is.
- Describe the
tolerance zone for straightness applied to a surface.
- Describe which
modifiers can be used with a straightness control applied to a surface.
- Determine if
a straightness control is applied to a surface or feature of size.
- Describe the
tolerance zone for a straightness control applied to a feature of
size.
- Describe how
Rule #1 provides an indirect straightness control.
- Recognize when
a straightness control overrides Rule #1.
- Describe which
modifiers can be used with a straightness control applied to a feature
of size.
- Calculate the
amount of bonus in a straightness MMC application.
- Describe two
common applications of a straightness control.
- Describe how a straightness control can be inspected.
Lesson
8: Circularity
Goal: Interpret the circularity control.
- Describe what
circularity is.
- Describe the
tolerance zone for a circularity control.
- Describe which
modifiers can be used in a circularity control.
- Describe how
Rule #1 provides an indirect circularity control.
- List three conditions
of a circularity application.
- Describe two
common applications of a circularity control.
- Describe how a circularity control can be inspected.
Lesson
9: Cylindricity
Goal: Interpret the cylindricity control.
- Describe what
cylindricity is.
- Describe three
requirements of a cylindricity control.
- Describe the
tolerance zone for a cylindricity control.
- Describe which
modifiers can be used in a cylindricity control.
- Describe how
Rule #1 provides an indirect cylindricity control.
- List three conditions
of a cylindricity application.
- Describe a common
application of a cylindricity control.
- Describe how
a cylindricity control can be inspected.
Lesson
10: Planar Datums
Goal: Understand the datum system (planar datums).
- Describe the
datum system.
- List three benefits
of the datum system.
- Define an implied
datum.
- Define a datum.
- Define a datum
feature.
- Define a true
geometric counterpart.
- Define a datum
feature simulator.
- Define the datum
feature symbol.
- Describe four
ways to specify a planar datum.
- Describe how
to reference datums in a feature control frame.
- Describe a datum
reference frame.
- List six degrees
of part freedom in space.
- Describe coplanar
datum features.
Lesson
11: Datum Targets
Goal: Interpret datum targets.
- Describe datum
targets.
- List three situations
where datums targets should be used.
- Recognize the
datum target symbol.
- State when a
datum target specification is on the front or back surface in a view
on a drawing.
- Describe why
basic dimensions are used to locate datum targets.
- Draw a simulated
gage for a datum target point specification.
- Draw a simulated
gage for a datum target line specification.
- Draw a simulated gage for a datum target area specification.
Lesson 12: Size Datums (RFS)
Goal: Interpret feature of size datum specifications
at RFS.
- Describe the
datum that results from a feature of size datum feature.
- List three ways
to specify an axis as a datum
- List three ways
to specify a centerplane as a datum.
- Explain how feature
of size datum references communicate size condition.
- Draw the datum
feature simulator for an external feature of size datum axis (RFS
primary).
- Draw the datum
feature simulator for an internal feature of size datum axis (RFS
primary).
- Draw the datum
feature simulator for an internal feature of size datum centerplane
(RFS primary).
- Draw the datum
feature simulator for an external feature of size datum centerplane
(RF primary).
- Describe coaxial datum features.
Lesson
13: Size Datums (MMC)
Goal: Interpret feature of size datum specifications
at MMC.
- List three conditions
when referencing a feature of size datum feature at MMC.
- Draw the datum
feature simulator for an external feature of size datum axis (MMC
primary).
- Draw the datum
feature simulator for an internal feature of size datum axis (MMC
primary).
- Explain the concept
of datum shift.
- Recognize when
datum shift is permissible.
- Calculate the amount of datum shift permissible.
Lesson
14: Orientation Controls
Goal: Understand the basics of orientation controls.
- Describe when
to use each orientation control.
- Describe what
controls the tolerance on implied 90° angles.
- Describe how
parallelism is controlled when no symbol is shown.
- Explain the definition
of perpendicularity.
- Explain the definition
of angularity.
- Explain the definition
of parallelism.
- Describe the
common tolerance zones for orientation controls.
- List two requirements
for orientation controls.
- List two indirect orientation controls.
Lesson
15: Perpendicularity
Goal: Interpret the perpendicularity control.
- List two common
tolerance zones for a perpendicularity control.
- List two requirements
of a perpendicularity control.
- Describe the
tolerance zone for a perpendicularity control applied to a surface.
- Explain how a
perpendicularity control applied to a surface affects its flatness.
- Explain the effect
of applying a perpendicularity control to a feature of size.
- Explain how to
specify a cylindrical tolerance zone for a perpendicularity control.
- Explain the tolerance
zone when a perpendicularity control is applied to a cylindrical feature
of size.
- Explain the effects
of a MMC modifier in a perpendicularity control.
- Describe the
gage for an application using a perpendicularity control applied at
MMC.
- Describe two common applications for a perpendicularity control.
Lesson
16: Angularity
Goal: Interpret the angularity control.
- List two common
tolerance zones for an angularity control.
- List two requirements
of an angularity control.
- Describe the
tolerance zone for an angularity control applied to a surface.
- Explain how an
angularity control applied to a surface affects its flatness.
- Explain the effect
of applying an angularity control to a feature of size.
- Explain how to
specify a cylindrical tolerance zone for an angularity control.
- Explain the tolerance
zone when an angularity control is applied to a cylindrical feature
of size.
- Describe two
applications for angularity.
- Explain how an angularity control can be inspected.
Lesson
17: Parallelism
Goal: Interpret the parallelism control.
- List two common
tolerance zones for a parallelism control.
- List two requirements
of a parallelism control.
- Describe the
tolerance zone for a parallelism control applied to a surface.
- Explain how a
parallelism control applied to a surface affects its flatness.
- Explain the effect
of applying a parallelism control to a feature of size.
- Describe how
to specify a cylindrical tolerance zone for a parallelism control.
- Interpret the
effects of specifying the tangent plane modifier with a parallelism
control.
- Describe two
applications for parallelism.
- Explain how a parallelism control can be inspected.
Lesson
18: Position - Introduction
Goal: Understand the fundamental concepts of
tolerance of position: the definitions and conventions, the advantages,
and the basic theories.
- Define the term "tolerance of position."
- Define a tolerance
of position control.
- Describe one
requirement of a tolerance of position control.
- List two types
of implied basic relationships common with tolerance of position.
- List six advantages
of tolerance of position.
- List four types
of relationships that can be controlled with tolerance of position.
- Describe when
the MMC modifier should be specified in a tolerance of position control.
- Explain the virtual
condition boundary theory for tolerance of position.
- Explain the axis theory for tolerance of position.
Lesson
19: Position - RFS/MMC/LMC
Goal: Interpret RFS, MMC and LMC tolerance of
position applications.
- List three conditions
that apply when a tolerance of position control is applied at RFS.
- Describe two
common tolerance zone shapes for a tolerance of position control at
RFS.
- Calculate the
worst-case boundary for a feature of size controlled with tolerance
of position at RFS.
- List three conditions
that exist when an MMC modifier is used in a tolerance of position
application.
- Describe the
tolerance zone in tolerance of position MMC applications.
- Calculate the
virtual condition of a feature of size controlled with a tolerance
of position at MMC.
- Calculate the
amount of bonus tolerance permissible for a tolerance of position
application.
- Calculate the
amount of datum shift available in a coaxial diameter tolerance of
position application.
- Describe when
a tolerance of position control should use the LMC modifier.
- Describe how
bonus tolerance is calculated in an LMC position application.
- Describe four
common applications for a tolerance of position control.
- Describe how
a tolerance of position control applied at RFS can be inspected.
- Define the term "cartoon gage."
- Describe how a tolerance of position control applied at MMC can be inspected.
Lesson 20: Position - Special Applications
Goal: Interpret tolerance of position special
applications.
- Describe the
tolerance zone(s) in a tolerance of position application of an elongated
hole.
- Describe when
to use the projected tolerance zone modifier.
- Describe the
tolerance zone(s) in a tolerance of position application with the
projected tolerance zone modifier.
- Recognize when
a tolerance of position control is used to control a symmetrical relationship.
- Describe the
tolerance zone(s) in a tolerance of position application used to control
the spacing and orientation of a hold pattern.
- Describe when
a multiple single-segment tolerance of position control should be
specified.
- Interpret a multiple
single-segment tolerance of position control.
- Describe what
a composite tolerance of position control is.
- Describe when
a composite tolerance of position control should be specified.
- Interpret a composite
tolerance of position control application.
- Recognize two major differences between multiple single-segment and composite position controls.
Lesson 21: Fastener Formulas
Goal: Calculate tolerance of position tolerance
values using the fixed and floating fastener formulas.
- Describe a fixed
fastener formula.
- Write the fixed
fastener formula.
- Calculate tolerance
of position tolerance values for fixed fastener applications.
- Describe a floating
fastener formula.
- Write the floating
fastener formula.
- Calculate tolerance
of position tolerance values for floating fastener applications.
- List two limitations of using the fastener formulas.
Lesson 22: Concentricity
Goal: Interpret the concentricity control.
- Describe a median
point.
- Describe the term "concentricity."
- Describe the
tolerance zone for a concentricity control.
- List three requirements
of a concentricity control.
- Interpret a concentricity
control application.
- Describe one
difference between concentricity and tolerance of position (RFS).
- Describe one
common application for concentricity.
- Describe how a concentricity control can be inspected.
Lesson
23: Symmetry
Goal: Interpret the symmetry control.
- Describe the term "symmetry."
- Describe the
tolerance zone for a symmetry control.
- Interpret a symmetry
control application.
- Describe one
difference between symmetry and tolerance of position (RFS).
- Describe one
common application for symmetry.
- Describe how a symmetry control can be inspected.
Lesson
24: Circular Runout
Goal: Interpret the circular runout control.
- Describe what
runout is.
- List two types
of runout controls.
- List three ways
a datum axis can be specified for a runout control.
- Explain what
circular runout is.
- Describe the
tolerance zone for a circular runout control (applied to a diameter).
- Describe how
circular runout can be inspected.
- Describe how
circular runout is a composite control.
- Determine the
maximum amount of axis offset from a circular runout control.
- Interpret a circular
runout application.
- Describe two common applications for circular runout.
Lesson
25: Total Runout
Goal: Interpret the total runout control.
- Describe what
total runout is.
- List two requirements
of a total runout control.
- Describe the
tolerance zone for a total runout control (applied to a diameter).
- Describe how
total runout is verified.
- Describe how
total runout is a composite control.
- Determine the
maximum amount of axis offset from a total runout control.
- Describe two
similarities between circular and total runout.
- Describe two
differences between circular and total runout.
- Describe two common applications for total runout.
Lesson
26: Introduction to Profile
Goal: Understand profile tolerancing.
- Describe how
profile can be a related feature control or a form control.
- Describe the term "profile."
- Describe the term "true profile."
- Describe the term "profile control."
- Describe the
four characteristics that profile can control.
- Describe the
difference in tolerance zones for a profile of a surface and a profile
of a line control.
- Recognize the
four types of profile tolerance zone specifications.
- Describe a bilateral
tolerance zone for a profile control.
- Describe a unilateral
tolerance zone for a profile control.
- Recognize the symbol for "between."
- Recognize the symbol for "all around."
- Describe the
extent to which a profile control tolerance zone applies on a part.
- List three advantages of using profile controls.
Lesson
27: Profile of a Surface
Goal: Interpret the profile of a surface control.
- List four part
characteristics profile of a surface can be used to control.
- List two requirements
of profile of a surface applied to a surface.
- Describe the
part characteristics being controlled when a profile of a surface
is used to control a surface location.
- List two requirements
of a profile of a surface control applied to a polygon.
- Describe the
part characteristics being controlled when profile of a surface is
applied to a polygon.
- List two requirements
of a profile of a surface control applied to a cone.
- Describe the
part characteristics being controlled when profile of a surface is
applied to a conical feature.
- List two requirements
of profile of a surface applied to coplanar surfaces.
- Describe the
part characteristics being controlled when profile of a surface is
applied to coplanar surfaces.
- Describe two
common applications for a profile of a surface control.
- Describe how a profile of a surface control can be inspected.
Lesson
28: Profile of a Line
Goal: Interpret the profile of a line control.
- List two requirements
of a profile of a line control.
- Describe the
tolerance zone for a profile of a line control.
- Describe how
profile of a line is view dependent.
- Interpret a multiple
single-segment profile application.
- Interpret an
application with a profile of a line control used with coordinate
tolerances.
- Describe two
common applications for a profile of a line control.
- Describe how profile of a line can be inspected.