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Fundamentals
of GD&T Web-Based Training
Based
on ASME Y14.5M-1994
Goals and Objectives
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.
