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An Overview ofASME Y14.41 2003
August 5, 2003
Alex Krulikowski
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Introduction
Alex Krulikowski
Manager of Standards and GD&T COE
Embedded GD&T implementation project at GM Powertrain
Chair of ASME Y14.41 Digital Product Definition Data Practices
Member of ASME Y14.5 Dimensioning and Tolerancing
Member of ASME Y14 Main
Author of 12 books on GD&T and Tolerance Analysis
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Agenda
Why a new standard was needed.
The challenge of creating thestandard quickly
An overview of the standard
Benefits of the standard
Closing comments
Todays discussion
includes
This presentation canbe obtained from
www.etinews.com
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The Need for a New Standard
The model is nominal only
From ASME Y14.41 - 2003
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The Need for a New Standard
The model is nominal only
Current standards did not
include tolerancing of models
From ASME Y14.41 - 2003
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The Need for a New Standard
The model is nominal only
Current standards did not
include tolerancing of models
Current standards did notinclude tolerancing of
axonometric views
From ASME Y14.41 - 2003
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The Need for a New Standard
The model is nominal only
Current standards did not
include tolerancing of models
Current standards did notinclude tolerancing of
axonometric views Reduced dimension drawings
were becoming more commonwithout any standard tosupport the practices.
From ASME Y14.41 - 2003
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ASME Y14.41 Committee Formed
ASME Y14.41 sub-committee
formed in 1998
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ASME Y14.41 Committee Formed
ASME Y14.41 sub-committee
formed in 1998
16 companies represented
Boeing CompanyCaterpillar IncCNH Global NVDepartment of the Army
Dassault SystemsEDS PLM SolutionsFord Motor Co.General Dynamics Land SystemsGeneral MotorsLockheed Martin AeronauticsRaytheonRockwell CollinsRolls-Royce CorpSDRCSeimens Power GenerationThiokol Propulsion
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ASME Y14.41 Committee Formed
ASME Y14.41 sub-committee
formed in 1998
16 companies represented
Accelerated Development
Committee
formedPublication
0 10Typical standard
1998 2003Y14.41
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ASME Y14.41 Standard
Title of new standard
DIGITAL PRODUCTDEFINITION DATA
PRACTICES
ASME Y14.41-2003
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ASME Y14.41 Standard
Title of new standard
Standardizing new practices
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ASME Y14.41 Standard
Title of new standard
Standardizing new practices
Scope
Establishes requirements and
reference documents applicable tothe creation of product definitiondata sets.
Defines exceptions and additionalrequirements to existing ASMEstandards for using productdefinition data sets or drawings in
digital format
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ASME Y14.41 Standard
Title for new standard
Standardizing new practices
Scope
Structure of the standard
Product definition data set Model only
Model plus drawing in
digital format
From ASME Y14.41 - 2003
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ASME Y14.41 Standard Contents
1 - General
2 Data set Identification andcontrol
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
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ASME Y14.41 Standard Contents
1 - General
2 Data set Identification andcontrol
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
30 Definitions Annotation
Annotation plane
Assembly model
Associated entities
Associated group
Associativity
Attribute
Data
Datum system Derivative
Design model
Digital element
Digital element
identifier
Direction dependent
tolerance
Geometric element
Hard copy
Installation model
Management Data
Model
Model coordinate
system
Model geometry
Model value
Product definitiondata set
Query
Represented line
element
Resolved dimension
Saved view
Supplemental
geometry
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ASME Y14.41 Standard Contents
1 - General
2 Data set Identification andcontrol
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Rules and guidelines
Data set identifier
Drawing Identification
Related data
Data management
Approval
Revision history
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ASME Y14.41 Standard Contents
1 - General
2 Data set Identification andcontrol
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Requirements, guidelines, options
Fundamental dimensioning & tolerancingrequirements
General model requirements
Associativity
Model coordinate systems
Application of supplementalgeometry
Part features not fully modeled
Model views
Saved views
Section viewsExample
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ASME Y14.41 Standard Contents
1 - General2 Data set Identification and
control
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Model Requirements Geometric Scale, Units and Precision
Scale 1:1
Units Must be specified in data set
Precision Must be specified in data set
Model completeness
Partial model (i.e. threads not modeled)
Must be specified in data set
Assembly Model
May be exploded, partiallyassembled, or completely assembledstate.
Only requires enough detail toensure correct identification,orientation, and placement of parts.
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ASME Y14.41 Standard Contents
1 - General2 Data set Identification and
control
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Common requirements
Ability to enable or disable thedisplay of annotation
Hard copy available upon demand
Model requirements
Associativity
Attributes available upon demand
Annotation planes
Leader lines
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ASME Y14.41 Standard Contents
1 - General2 Data set Identification and
control
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Requirements
All notes must be in a singleannotation plane
General notes do not requireassociation
Flag notes require association
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ASME Y14.41 Standard Contents
1 - General2 Data set Identification and
control
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Resolved dimensions Rounded to the number of places required
for the design
Applies to all dimensions obtained from the
model.
Basic Dimensions Queried model values shall be interpreted as
basic dimensions unless superceded by a
toleranced dimension or defined as a
reference dimension.
If basic dimensions are displayed, they shall
be in accordance with Y14.5.
Size dimensions
Bilateral or uni lateral tolerance Thedisplayed size dimension must agree withthe queried model value.
Limit Dimensions The resolved model
value may equal one of the limit dimensions,
or be any value within the displayed range oflimits
Example
Example
Example
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ASME Y14.41 Standard Contents
1 - General2 Data set Identification and
control
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Establishes Requirements for: Datum reference frame and model
coordinate system correspondence
Datum reference frame and model
coordinate system associativity
Multiple Datum reference frame andmodel coordinate system relationship
Shows attachment methods foridentification of datum features anddatum targets
Example
Example
S S d d C
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ASME Y14.41 Standard Contents
1 - General2 Data set Identification and
control
3 Data set requirements4 Model Requirements
5 Common requirements forproduct definition data
6 Notes and Special Notations
7 Model Values andDimensions
8 Plus and Minus Tolerances
9 Datum Applications
10- Geometric Tolerances
Establishes Requirements for:
Attachment methods for geometrictolerances
Display in axonometric views
Establishes exception / expansions of Y14.5
New symbol for unilateral profile
New method for denoting view dependentcontrols
Uses symbol from Y14.8 (castings) formovable datum targets
Example
ASME Y14 41 St d d B fit
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ASME Y14.41 Standard Benefits
The new standard provides
several benefits to industry.
Standardize communications relative todigital data (30 new terms defined )
Provides guidance on how to displaytolerances on models and axonometric
views
Introduces the concept of a productdefinition data set
Provide guidance to software manufacturers
Methods for creating and using digital dataare being addressed
Cl i C t
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Closing Comments
The first version of new
standard leaves several
challenges to be addressed.
Currently the standard is more of a
collection of practices or a toolbox of
math based practices in industry.
Cl i C t
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Closing Comments
The first version of new
standard leaves several
challenges to be addressed.
The current focus is the display of
annotation.
Cl i C t
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Closing Comments
The first version of new
standard leaves several
challenges to be addressed.
Future versions need to address the
transistion between engineering
specifications, the electronic model, and
part inspection.
Closing Comments
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Closing Comments
The first version of new
standard leaves several
challenges to be addressed.
There are gaps in ASME standards that
need to be filled to support math
processes (i.e. tolerances not
mathematically sound, vaguerequirements, view dependent
tolerances etc)
Closing Comments
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Closing Comments
Standards
Hardware Software
Translators
Viewers
Connectivity
The first version of new
standard leaves several
challenges to be addressed.
The Y14.41 standard is just
one tool of the set needed for
industry to become math
based.
Closing Comments
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Closing Comments
The first version of new
standard leaves several
challenges to be addressed.
The Y14.41 standard is just
one tool of the set needed for
industry to become math
based.
The culture of the users is a
key to implementing a math
based process in industry
Standards
Hardware Software
Translators
Viewers
Connectivity
Culture
Closing Comments
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Closing Comments
Standards
Hardware Software
Translators
Viewers
Connectivity
The first version of new standardleaves several challenges to be
addressed.
The Y14.41 standard is just onetool of the set needed for industry
to become math based.
The culture of the users is a keyto implementing a math based
process in industry.
To make the math based processa reality in industry, it will take
many tools coming together and
working in harmony
Culture
How to purchase a copy of the Y14 41 Standard
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How to purchase a copy of the Y14.41 Standard
http://www.asme.org/codes/pr/y1441.html#description
Digital Tolerancing Forum
http://www.asme.org/codes/pr/y1441.html#descriptionhttp://www.asme.org/codes/pr/y1441.html#description -
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Digital Tolerancing Forumhttp://www.etinews.com
The End
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The End
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