· COURSE
DESCRIPTION: This course uses
the strategy of giving the participants a thorough knowledge of
Geometric Dimensioning and Tolerancing by detailing critical information
on the basics of GD&T, then providing lectures, realistic examples,
discussions and applications problems on the more difficult principles
of GD&T. It allows the
participant the opportunity to learn and apply techniques in datum
selection and tolerancing optimization. This approach will preserve
functional product requirements, while taking into consideration
manufacturing difficulties, introducing more producible tolerances,
practical datum structures and pre-planning measurement methods.
All dimensioning techniques discussed are functional, but also
producible and inspectable. It
shows how bonus tolerances, composite tolerances and proper datum
selection can decrease costs while preserving functionality.
The lectures, discussions and applications problems presented not
only give participants a thorough knowledge of the meaning of each
geometric characteristic symbol, but also a perspective on how each
symbol relates to the others for strengths and weaknesses, capabilities,
advantages and disadvantages.
Throughout
this course the participants are constantly reminded of the most common
errors, pitfalls and traps that any user can easily fall victim to and
also how to avoid such problems. Do’s
and Don'ts of proper tolerancing are reinforced in every segment of the
course by showing how they apply to realistic assembly tolerancing
conditions. It shows the
best usage of all geometric characteristic symbols and datum structures.
Inspection methods and quality assurance strategies are stressed
to create an understanding of the theory of geometric tolerancing by
creating a physical embodiment of that theory through proper inspection
techniques, gage and fixture design and usage.
A thorough discussion of the basics of GD&T principles is the
basis for the first part of the course.
Then the course escalates into more advanced techniques and
principles that build on the participants’ gained knowledge in every
segment of the course to that point.
The goal of this course is not only to give the participants a
comprehensive knowledge of Geometric Dimensioning and Tolerancing
techniques, but through the use of discussion and applications problems,
the ability to apply these techniques to their product lines with a
great deal of confidence.
COURSE MATERIALS:
Geometric Dimensioning and Tolerancing in
2007
·
CLASS SIZE:
We only require that the classroom be of sufficient size to
accommodate the number of course participants comfortably.
·
WHO SHOULD ATTEND: This
is the course that provides the foundation of GD&T knowledge upon
which all advanced courses rely. Anyone
involved with improving the quality of their parts should attend.
This course is designed for personnel whose work requires them to
either communicate, interpret or manufacture products through the use of
engineering drawings and/or CAD models.
· COURSE
DURATION: Recommend
four 8-hour days; also available in a 3-day format.
·
COURSE AGENDA:
1)
Overview of GD&T
Basic Principles. A
sheet of notes is given on 1. Rules, 2. Datum Selection Criteria, 3.
Fixed and Floating Fastener Formulas and 4. Do’s and Don’ts for
Geometric Characteristic Symbols. A
lecture and discussions on the major principles of geometric
dimensioning and tolerancing will be given by presenting a simple
assembly of mating parts and applying geometric controls to each part in
the assembly. The effects of MMC, LMC and RFS concepts are discussed.
Inner and Outer Boundaries, Virtual Condition and Resultant
Condition of features of size are explained.
Gage design for position controls will be introduced in this
section.
a.
Lecture, examples
and discussion
2)
Geometric
Characteristics and Their Inspection. All fourteen geometric
characteristic symbols will be explained in a food
chain of symbology to show how each symbol relates to the others for
control of size, form, orientation, profile, runout and location.
Geometric
Characteristic symbols covered include; flatness, straightness,
circularity, cylindricity, perpendicularity, angularity, parallelism,
profile of a line, profile of a surface, circular runout, total runout,
concentricity, symmetry and position. This will give each
participant a perspective of how to choose exactly the right
characteristic for every step of the part definition.
Inspection of all characteristics will be discussed and several
options shown for each.
a.
Lecture, examples
and discussion
3)
Datum selection,
choosing the perfect geometric characteristic for parts and assemblies.
Fixed fastener assembly mating part tolerance formulas and the effects
of modifiers (MMC after datum features) are also emphasized.
A more complex assembly
will be used to explain the proper selection of datum features and a
linear progression of geometric controls.
The fixed fastener formulas will be thoroughly explained and used
to calculate and distribute geometric tolerances for maximum
manufacturability and functionality.
Process capability, producibility and functional product
requirements are considered and shown to work in tandem to create the
best tolerancing scheme possible. Threaded holes, positional tolerancing,
projected tolerance zones and inspection techniques are discussed.
a.
Lecture, examples,
discussion and applications
4)
Producibility and
Measurement Considerations.
How manufacturing processing can influence datum selection
without adversely affecting part functionality.
How to correctly distribute tolerances in an assembly to reduce
difficulties in part manufacture. How to imply a manufacturing and a
measurement plan in sequencing geometric controls.
a.
Lecture, examples and
discussion
5)
Holding Direct vs.
Indirect Functional Relationships in an Assembly.
A floating fastener assembly will be used to explain how
important functional relationships can be held using different datum
structures. How to increase
tolerances by proper datum selection is discussed.
a.
Lecture, examples,
discussion and application problems
6)
Application of Common
Tolerancing Methods and Datum Structures.
A series of application problems are used to build participants'
knowledge and confidence in applying common datum approaches and
tolerancing methods. Circular
surfaces, planar surfaces, free form surfaces, datum targets,
free state
variation, the BOUNDARY concept for elongated holes and other oddly
configured features.
a.
Examples and Discussion
7)
Commonalities in
Tolerancing Approaches on Dissimilar Part Geometries.
a.
Profile of a Surface
all-around, Two Single Segment Position, Perpendicularity of
Centerplanes, Simultaneous Gaging vs. Separate Gaging Requirements,
Analyzing Geometric Tolerances, Angular Orientation Datums, Analyzing
Tolerances for Minimum and Maximum Axial Separation, Wall Thickness and
Housing Requirements.
8)
Design, Dimensioning
and Tolerancing of Functional Gages and Fixtures.
Quality Assurance Strategies and Measurement Planning.
a.
Lecture, example and application problem
9)
Converting from Plus
and Minus Tolerancing to Positional Tolerance
a.
Calculating Geometric
Tolerances for Functionality and Cost Savings
b.
Lecture,
examples and application problems
10)
Composite Position vs.
Two Single Segment Positional Tolerancing.
a.
Lecture, examples and
discussion
11)
Composite Profile vs.
Two Single Segment Profile Tolerancing.
a.
Lecture, examples,
discussion and application problem
12)
Applying Position
Tolerances to a Complex Assembly with Multiple Datum Structures for
Floating and Fixed Fastener Assembly Conditions
a.
Lecture, examples,
discussion and application problems
This course is
recommended to run for 4 consecutive days, 8 hours a day.
A 3-day version of this course is also available.
One hour will be taken for lunch each day.
Breaks will be taken at regular intervals. |