asme y presentation

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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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Current standards did not

include tolerancing of models

From ASME Y14.41 - 2003


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Current standards did notinclude tolerancing of

axonometric views

From ASME Y14.41 - 2003


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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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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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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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Standardizing new practices


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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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Title for new standard


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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1 - General









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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1 - General









Rules and guidelines

Data set identifier

Drawing Identification

Related data

Data management

Approval

Revision history


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1 - General









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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1 - General2 Data set Identification and

control








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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control








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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control








Requirements

All notes must be in a singleannotation plane

General notes do not requireassociation

Flag notes require association


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control








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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control








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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control








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 current focus is the display of

annotation.

Cl i C t


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Closing Comments




Future versions need to address the

transistion between engineering

specifications, the electronic model, and

part inspection.

Closing Comments


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Closing Comments




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 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 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
http://www.etinews.com/http://www.etinews.com/


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The End


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Return

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