Geometrical product specifications (GPS) - Flatness - Part 2: Specification operators (ISO 12781-2:2011)

ISO 12781-2:2011 specifies the complete specification operator for flatness of complete integral features only, i.e. geometrical characteristics of individual features of type plane.

Geometrische Produktspezifikation (GPS) - Ebenheit - Teil 2: Spezifikationsoperatoren (ISO 12781-2:2011)

Dieser Teil von ISO 12781 legt den vollständigen Spezifikationsoperator für die Ebenheit von vollständigen Geometrieelementen fest, d. h. geometrische Merkmale von einzelnen Geometrieelementen der Art Ebene fest.

Spécification géométrique des produits (GPS) - Planéité - Partie 2: Opérateurs de spécification (ISO 12781-2:2011)

L'ISO 12781-2:2011 spécifie l'opérateur de spécification complet pour la planéité des éléments intégraux complets uniquement, c'est-à-dire pour les caractéristiques géométriques des éléments de type plan.

Specifikacija geometrijskih veličin izdelka - Ravnost - 2. del: Parametri za specifikacijo (ISO 12781-2:2011)

Ta del ISO 12781 določa celotne parametre za specifikacijo ravnosti samo vgrajenih funkcij, tj. geometrijske značilnosti funkcij tipske ravnine.

General Information

Status
Published
Publication Date
31-Mar-2011
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
07-Mar-2011

RELATIONS

Buy Standard

Standard
EN ISO 12781-2:2011
English language
21 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 12781-2:2011
01-december-2011
1DGRPHãþD
SIST-TS CEN ISO/TS 12781-2:2008
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND5DYQRVWGHO3DUDPHWUL]D
VSHFLILNDFLMR ,62

Geometrical product specifications (GPS) - Flatness - Part 2: Specification operators

(ISO 12781-2:2011)

Geometrische Produktspezifikation (GPS) - Ebenheit - Teil 2: Spezifikationsoperatoren

(ISO 12781-2:2011)

Spécification géométrique des produits (GPS) - Planéité - Partie 2: Opérateurs de

spécification (ISO 12781-2:2011)
Ta slovenski standard je istoveten z: EN ISO 12781-2:2011
ICS:
01.040.17 Meroslovje in merjenje. Metrology and measurement.
Fizikalni pojavi (Slovarji) Physical phenomena
(Vocabularies)
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND *36 Specification (GPS)
SIST EN ISO 12781-2:2011 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 12781-2:2011
---------------------- Page: 2 ----------------------
SIST EN ISO 12781-2:2011
EUROPEAN STANDARD
EN ISO 12781-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2011
ICS 17.040.20 Supersedes CEN ISO/TS 12781-2:2007
English Version
Geometrical product specifications (GPS) - Flatness - Part 2:
Specification operators (ISO 12781-2:2011)

Spécification géométrique des produits (GPS) - Planéité - Geometrische Produktspezifikation (GPS) - Ebenheit - Teil

Partie 2: Opérateurs de spécification (ISO 12781-2:2011) 2: Spezifikationsoperatoren (ISO 12781-2:2011)

This European Standard was approved by CEN on 26 February 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12781-2:2011: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 12781-2:2011
EN ISO 12781-2:2011 (E)
Contents Page

Foreword ..............................................................................................................................................................3

---------------------- Page: 4 ----------------------
SIST EN ISO 12781-2:2011
EN ISO 12781-2:2011 (E)
Foreword

This document (EN ISO 12781-2:2011) has been prepared by Technical Committee ISO/TC 213 "Dimensional

and geometrical product specifications and verification" in collaboration with Technical Committee

CEN/TC 290 “Dimensional and geometrical product specification and verification” the secretariat of which is

held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by October 2011, and conflicting national standards shall be withdrawn at

the latest by October 2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes CEN ISO/TS 12781-2:2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
Endorsement notice

The text of ISO 12781-2:2011 has been approved by CEN as a EN ISO 12781-2:2011 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 12781-2:2011
---------------------- Page: 6 ----------------------
SIST EN ISO 12781-2:2011
INTERNATIONAL ISO
STANDARD 12781-2
First edition
2011-04-01
Geometrical product specifications
(GPS) — Flatness —
Part 2:
Specification operators
Spécification géométrique des produits (GPS) — Planéité —
Partie 2: Opérateurs de spécification
Reference number
ISO 12781-2:2011(E)
ISO 2011
---------------------- Page: 7 ----------------------
SIST EN ISO 12781-2:2011
ISO 12781-2:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 12781-2:2011
ISO 12781-2:2011(E)
Contents Page

Foreword ............................................................................................................................................................iv

Introduction.........................................................................................................................................................v

1 Scope......................................................................................................................................................1

2 Normative references............................................................................................................................1

3 Terms and definitions ...........................................................................................................................1

4 Complete specification operator .........................................................................................................1

4.1 General ...................................................................................................................................................1

4.2 Probing system......................................................................................................................................2

5 Compliance with the specification ......................................................................................................2

Annex A (informative) Harmonic content of a nominally flat workpiece and extraction strategy..............3

Annex B (informative) Extraction strategies ....................................................................................................7

Annex C (informative) Relationship to the GPS matrix model .....................................................................11

Bibliography......................................................................................................................................................13

© ISO 2011 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 12781-2:2011
ISO 12781-2:2011(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 12781-2 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product

specifications and verification.

This first edition of ISO 12781-2 cancels and replaces ISO/TS 12781-2:2003, which has been technically

revised.

ISO 12781 consists of the following parts, under the general title Geometrical product specifications (GPS) —

Flatness:
⎯ Part 1: Vocabulary and parameters of flatness
⎯ Part 2: Specification operators
iv © ISO 2011 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 12781-2:2011
ISO 12781-2:2011(E)
Introduction

This part of ISO 12781 is a geometrical product specification (GPS) standard and is to be regarded as a

general GPS standard (see ISO/TR 14638). It influences chain link 3 of the chain of standards on form of a

surface (independent of a datum).

The ISO/GPS Masterplan given in ISO/TR 14638 gives an overview of the ISO/GPS system of which this part

of ISO 12781 is a part. The fundamental rules of ISO/GPS given in ISO 8015 apply to this part of ISO 12781

and the default decision rules given in ISO 14253-1 apply to specifications made in accordance with this part

of ISO 12781, unless otherwise indicated.

For more detailed information on the relationship of this part of ISO 12781 to other standards and the GPS

matrix model, see Annex C.

This part of ISO 12781 specifies the specification operators according to ISO 17450-2 for flatness of integral

features.

ISO 12780-2 does not specify defaults for filter cut-off, probe tip radius and method of association (reference

plane). This means that it is necessary for a flatness specification to explicitly state which values are to be

used for these specification operations in order for it to be unique.

Consequently, if a specification does not explicitly state which values are to be used for one or more of these

operators, the specification is ambiguous (see ISO 17450-2) and a supplier can use any value for the

operator(s) not specified when proving conformance.

Extracting data always involves applying a certain filtering process. An additional filtering of the extracted data

might or might not be applied. This additional filter can be a mean line filter (Gaussian, spline, wavelet, etc.) or

a non-linear filter (e.g. morphological filter). The type of filtering influences the definition of flatness and the

specification operators and, therefore, needs to be stated unambiguously.

NOTE 1 Stylus filtering is not sufficient on its own to smooth a profile. In certain circumstances, it can create spurious

high-frequency content, thus giving incorrect values. To correct this, a longwave-pass filter can be employed. A Gaussian

filter is used, since this is the state-of-the-art. This filter has some shortcomings, e.g. it can distort, rather than eliminate

some roughness features and it can distort, rather than transmit correctly some waviness features. It is envisioned that

new filters under development within ISO provide better solutions for several of these issues.

NOTE 2 If a smaller tip radius than the one specified is used for a given cut-off length, the resulting measured value is

generally higher. This effect is usually insignificant. If a larger tip radius is used, the resulting measured value is generally

lower. The amount of change is heavily dependent on the surface measured.

NOTE 3 The measuring force of 0 N is chosen to eliminate effects of elastic deformation of the workpiece from the

specification operator. On metal surfaces with adequate thickness, the effect of normally occurring measuring forces is

negligible.

NOTE 4 Aliasing and other problems during extraction (see Annex A) due to the higher harmonic content of the skin

model, in the straightness directions, can cause specification uncertainty.

This part of ISO 12781 is not intended to disallow any means of measuring flatness.

© ISO 2011 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 12781-2:2011
---------------------- Page: 12 ----------------------
SIST EN ISO 12781-2:2011
INTERNATIONAL STANDARD ISO 12781-2:2011(E)
Geometrical product specifications (GPS) — Flatness —
Part 2:
Specification operators
1 Scope

This part of ISO 12781 specifies the complete specification operator for flatness of complete integral features

only, i.e. geometrical characteristics of individual features of type plane.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 12781-1:2011, Geometrical product specifications (GPS) — Flatness — Part 1: Vocabulary and

parameters of flatness

ISO 14253-1:1998, Geometrical Product Specifications (GPS) — Inspection by measurement of workpieces

and measuring equipment — Part 1: Decision rules for proving conformance or non-conformance with

specifications

ISO 17450-2:— , Geometrical product specifications (GPS) — General concepts — Part 2: Basic temets,

specifications, operators and uncertainties
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12781-1 and ISO 17450-2 apply.

4 Complete specification operator
4.1 General

The complete specification operator (see ISO 17450-2) is a full ordered set of unambiguous specification

operations in a well-defined order. The complete specification operator defines the transmission band for the

flatness surface, together with an appropriate stylus tip geometry.

NOTE In practice, it is unrealistic to achieve comprehensive coverage of the flatness feature given by the theoretical

minimum density of points (see Annex B) within an acceptable time span using current technology. Therefore, more

limited extraction strategies are employed that give specific rather than general information concerning the deviations from

flat form.
1) To be published. (Revision of ISO/TS 17450-2:2002)
© ISO 2011 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 12781-2:2011
ISO 12781-2:2011(E)
4.2 Probing system
4.2.1 Probing method

A contacting probing system with a stylus tip, as defined in 4.2.2, is part of the specification operator.

4.2.2 Stylus tip geometry
The theoretically exact stylus tip geometry is a sphere.
4.2.3 Probing force
The probing force is 0 N.
5 Compliance with the specification
For proving conformance or non-conformance with the specification, ISO
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.