FprEN ISO 21920-3

Geometrical product specifications (GPS) - Surface texture: Profile - Part 3: Specification operators (ISO/FDIS 21920-3:2021)

This part of ISO 21920 specifies the complete specification operator for surface texture (scale limited surfaces) by profile methods.

Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Profile - Teil 3: Spezifikationsoperatoren (ISO/FDIS 21920-3:2021)

Dieses Dokument legt den vollständigen Spezifikationsoperator für die Oberflächenbeschaffenheit durch Profilverfahren fest.

Spécification géométrique des produits (GPS) - État de surface: Méthode du profil - Partie 3: Opérateurs de spécification (ISO/FDIS 21920-3:2021)

Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: profil - 3. del: Operatorji specifikacij (ISO/DIS 21920-3:2020)

General Information

• Status: Not Published
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Drafting Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Current Stage: 6055 - CEN Ratification completed (DOR) - Publishing
• Due Date: 27-Nov-2021
• Completion Date: 27-Nov-2021
• Ref Project: oSIST prEN ISO 21920-3:2020 - Geometrical product specifications (GPS) - Surface texture: Profile - Part 3: Specification operators (ISO/DIS 21920-3:2020)

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 21920-3:2020
01-april-2020

Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: profil - 3. del:

Operatorji specifikacij (ISO/DIS 21920-3:2020)

Geometrical product specifications (GPS) - Surface texture: Profile - Part 3: Specification

operators (ISO/DIS 21920-3:2020)
Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit - Teil3:
Spezifikationsoperatoren (ISO/DIS 21920-3:2020)

Spécification géométrique des produits (GPS) - État de surface: Méthode du profil -

Partie 3: Opérateurs de spécification (ISO/DIS 21920-3:2020)
Ta slovenski standard je istoveten z: prEN ISO 21920-3
ICS:
17.040.20 Lastnosti površin Properties of surfaces
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
oSIST prEN ISO 21920-3:2020 en,fr,de

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

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oSIST prEN ISO 21920-3:2020
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oSIST prEN ISO 21920-3:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 21920-3
ISO/TC 213 Secretariat: BSI
Voting begins on: Voting terminates on:
2020-02-19 2020-05-13
Geometrical product specifications (GPS) — Surface
texture: Profile —
Part 3:
Specification operators

Spécification géométrique des produits (GPS) — État de surface: Méthode du profil —

Partie 3: Opérateurs de spécification
ICS: 17.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
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Reference number
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ISO/DIS 21920-3:2020(E)
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
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oSIST prEN ISO 21920-3:2020
ISO/DIS 21920-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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oSIST prEN ISO 21920-3:2020
ISO/DIS 21920-3:2020(E)
Contents Page

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

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

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

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

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

3.1 Setting class ............................................................................................................................................................................................... 1

4 Complete specification operation ....................................................................................................................................................... 1

4.1 General ........................................................................................................................................................................................................... 2

4.2 General default settings ................................................................................................................................................................... 2

4.3 Default settings based on the specification .................................................................................................................... 3

4.3.1 General...................................................................................................................................................................................... 3

4.3.2 Default settings for functional parameters (Rk, Rpk, Rvk etc.) and R- and

W-parameters without defined defaults ..................................................................................................... 3

4.3.3 Default settings for R-parameters with specified upper tolerance limit ......................... 4

4.3.4 Default settings for R-parameters with specified bilateral tolerance limits ................ 4

4.3.5 Default settings for R-parameters with specified lower tolerance limit ......................... 5

4.3.6 Default settings for P-parameters ..................................................................................................................... 6

5 Default attribute values for parameters from ISO 21920-2 .................................................................................... 6

5.1 General ........................................................................................................................................................................................................... 6

5.2 Spatial parameters ............................................................................................................................................................................... 7

5.3 Functions and related parameters ......................................................................................................................................... 7

5.4 Volume parameters ............................................................................................................................................................................. 7

5.5 Feature parameters ............................................................................................................................................................................. 7

6 Default units for parameters from ISO 21920-2 .................................................................................................................. 7

6.1 General ........................................................................................................................................................................................................... 7

6.2 Height parameters ............................................................................................................................................................................... 7

6.3 Spatial parameters ............................................................................................................................................................................... 8

6.4 Hybrid parameters .............................................................................................................................................................................. 8

6.5 Functions and related parameters ......................................................................................................................................... 8

6.6 Volume parameters ............................................................................................................................................................................. 8

6.7 Feature parameters ............................................................................................................................................................................. 9

Annex A (informative) Flowchart: How to get specification operators? .......................................................................10

Annex B (informative) Examples for the determination of default settings ............................................................11

Annex C (informative) Motivation for the defined way of determination of the specification

operator and major changes to ISO 4288 ................................................................................................................................15

Annex D (informative) Settings for examination in case of a missing specification ........................................16

Annex E (informative) Relation with the GPS matrix .......................................................................................................................18

Bibliography .............................................................................................................................................................................................................................20

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oSIST prEN ISO 21920-3:2020
ISO/DIS 21920-3:2020(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.

This edition cancels and replaces the edition of ISO 4288:1996, which has been technically revised.

The main changes compared to the edition of ISO 4288:1996 are as follows:
— no distinction between periodic and non-periodic profiles
— the basic for defaults is the drawing indication
— Tmax rule is the default tolerance acceptance rule

The committee responsible for this document is Technical Committee ISO/TC 213, Dimensional and

geometrical product specifications and verification.
A list of all parts in the ISO 21920 series can be found on the ISO website.
iv © ISO 2020 – All rights reserved
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oSIST prEN ISO 21920-3:2020
ISO/DIS 21920-3:2020(E)
Introduction

This part of ISO 21920 is a geometrical product specification (GPS) standard and is to be regarded as a

general GPS standard (see ISO 14638). It influences the chain link C of the chains of standards on profile

and areal surface texture.

The ISO/GPS matrix model given in ISO 14638 gives an overview of the ISO/GPS system of which this

part of ISO 21920is a part. The fundamental rules of ISO/GPS given in ISO 8015 apply to this part

of ISO 21920 and the default decision rules given in ISO 14253-1 apply to the specifications made in

accordance with this part of ISO 21920, unless otherwise indicated.

For more detailed information of the relation of this part of ISO 21920 to other standards and the GPS

matrix model, see Annex E.

This part of ISO 21920 specifies the specification operators according to ISO 17450-2.

© ISO 2020 – All rights reserved v
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oSIST prEN ISO 21920-3:2020
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oSIST prEN ISO 21920-3:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 21920-3:2020(E)
Geometrical product specifications (GPS) — Surface
texture: Profile —
Part 3:
Specification operators
1 Scope

This part of ISO 21920 specifies the complete specification operator for surface texture (scale limited

surfaces) by profile methods.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 21920-1:2019, Geometrical product specifications (GPS) — Surface texture: Profile — Part 1: Indication

of surface texture

ISO 21920-2:2019, Geometrical product specifications (GPS) — Surface texture: Profile — Part 2: Terms,

definitions and surface texture parameters
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 21920-2 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 Setting class
identifier Sc1, Sc2 … to Sc5 to label the relevant column of table 2 to table 6

Note 1 to entry The setting class is defined by the indication: Either by the specified limit or by an explicitly

given setting criterion or by an explicit indication of the setting class, see 4.3.1 to 4.3.6.

4 Complete specification operation

For not explicitly specified criteria (see 21920-1) and often used specification operators default settings

are used. Default settings do not control the function of a workpiece in a general way.

The advantage of the default specification operators given in 4.2 and 4.3 is to simplify the drawing

indications.
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oSIST prEN ISO 21920-3:2020
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4.1 General

The complete specification operation (see ISO/TS 17450-2) consists of all the operators required for an

unambiguous specification. It consists of an ordered full set of unambiguous specification operations

in an unambiguous order. For profile surface texture the complete specification operation defines all

setting criteria.

Basis for the default settings is the drawing indication, either the specified setting class number (Scn)

or the specified profile L-filter nesting index for R- parameters and the specified profile S-filter nesting

index for W- parameter respectively. If no specification exists, the parameter of interest is the basis for

the default settings.
NOTE 1 There is no distinction between periodic and aperiodic profiles.

NOTE 2 This standard specifies specification operators; “the verification operator is the physical

implementation of the specification operator. It may have exactly the same operations in the same order, in which

case the method uncertainty is zero, or it may have different operations or perform the operations in a different

order, in which case the method uncertainty is not zero. ” [ISO 8015]

There is a flowchart in Annex A to show the general way to get the specification operators.

4.2 General default settings

Table 1 gives the general default settings independent of the specified parameter type.

Table 1 — General default settings
Criterion Default setting
Procedure of profile
Mechanical profile
extraction
The direction corresponding to the maximum values of height parameters (perpen-
Profile direction
dicular to the dominant lay direction).

Location on that part of the surface on which the maximum values of the specified pa-

Profile position rameter can be expected (default), or the minimum values of the specified parameter

if the lower tolerance limit is specified, see note 1
Tolerance type Upper tolerance limit
Tolerance acceptance
Tmax; all measured values shall be within the specified limit
rule
Profile S-filter type Gaussian filter according to ISO 16610-21
Profile L-filter type (for
Gaussian filter according to ISO 16610-21
R-parameters) Profile

Exceptionally, the default L-filter for Rk, Rpk, Rvk, RMrk1, RMrk2, Rpq, Rmq, Rvq is

S-filter type (for W-pa-
the Robust Gaussian filter, second order according to ISO 16610-31, see note 2
rameters)
F-operator Removal of the nominal form
F-operator type Total least square

Only for section based section length = length of cut off λc; Profile L-filter cut off λc (for R-parameters) or

R- and W- parameters: Profile S-filter cut off λc (for W-parameters)

NOTE 1 For the verification this part of the surface can be assessed e.g. by visual inspection. For the

verification surface imperfections or surface defects are to be taken into account if not otherwise stated.

NOTE 2 The change of the default filter type of the Rk, Rpk, Rvk, RMrk1, RMrk2, Rpq, Rmq, Rvq parameters

leads to a better elimination of large scale components and can generate slightly differing values of these

parameters.
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oSIST prEN ISO 21920-3:2020
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4.3 Default settings based on the specification
4.3.1 General

This defines default settings based on the specification in addition to the general default settings.

For parameters not listed in tables 3 to 6 the profile L-filter nesting index Nic for R-parameters or the

profile S-filter nesting index Nic for W-parameters respectively or the setting class number Sc shall be

specified and this defines the default settings.

If several parameters are specified within one graphical symbol, the parameter in the first line is

relevant for the selection of default settings.

In tables 2 to 6 the topmost specified criterion defines the column for all other not explicitly specified

default settings.

If a nesting index Nic not listed in tables 2 to 6 is specified a second criterion shall be specified to define

the column for the default settings.

If a nesting index Nis not listed in tables 2 to 6 is specified the maximum sampling interval dx shall be

Nis / 5.
NOTE see examples B.1 to B.6

4.3.2 Default settings for functional parameters (Rk, Rpk, Rvk etc.) and R- and W-parameters

without defined defaults

The default settings for the functional parameters and parameters without defined defaults based on

the specified profile L-filter nesting index Nic for R-parameters or the specified profile S-filter nesting

index Nic for W- parameter respectively or the specified setting class number Sc are given in table 2.

NOTE 1 For the functional parameters Rk, Rpk, Rvk etc. the specification of the Profile L-filter nesting index

Nic or the specification of the setting class number Sc is mandatory.

NOTE 2 For R- and W-parameters not listed in table 3 the specification of the profile L-filter nesting index Nic

or the specified profile S-filter nesting index Nic for W- parameter respectively or the specification of the setting

class number Sc is mandatory.

Table 2 — Default settings for functional parameters (Rk, Rpk, Rvk etc.) and R- and

W-parameters without defined defaults
Setting class Sc Sc1 Sc2 Sc3 Sc4 Sc5
Profile L-filter nesting
index Nic (cut off λc, for
R-parameters)
0,08 0,25 0,8 2,5 8
or Profile S-filter nesting
index Nic (cut off λc, for
W-parameters)
Evaluation length lm
0,4 1,25 4 12,5 40
Profile S-filter nesting
index Nis (cut off λs)
0,8 0,8 2,5 8 25
Maximum sampling inter-
val dx
0,15 0,15 0,5 1,5 5
Maximum tip radius r µm 2 2 2 5 10
tip
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oSIST prEN ISO 21920-3:2020
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Table 2 (continued)
Setting class Sc Sc1 Sc2 Sc3 Sc4 Sc5
Only for section based parameters:
Section length lsc mm 0,08 0,25 0,8 2,5 8
Number of sections nsc 5 5 5 5 5
4.3.3 Default settings for R-parameters with specified upper tolerance limit

The default settings for R-parameters based on the specified upper limit U or specified

...