Rolling bearings - Balls - Part 2: Ceramic balls

This part of ISO 3290 specifies requirements for finished silicon nitride balls for rolling bearings.

Wälzlager - Rollenelemente - Teil 2: Keramikkugeln

Roulements - Billes - Partie 2: Billes de roulement en céramique

L'ISO 3290-2:2008 fixe les exigences relatives aux billes finies, en nitrure de silicium, utilis�es pour les roulements.

Kotalni ležaji - Kroglice - 2. del: Keramične kroglice

General Information

Status
Withdrawn
Public Enquiry End Date
29-Jul-2008
Publication Date
06-Apr-2009
Withdrawal Date
10-Feb-2015
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
28-Jan-2015
Due Date
20-Feb-2015
Completion Date
11-Feb-2015

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INTERNATIONAL ISO
STANDARD 3290-2
First edition
2008-12-15
Rolling bearings — Balls —
Part 2:
Ceramic balls
Roulements — Billes —
Partie 2: Billes de roulement en céramique
Reference number
ISO 3290-2:2008(E)
ISO 2008
---------------------- Page: 1 ----------------------
ISO 3290-2:2008(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2008

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 2008 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 3290-2:2008(E)
Contents Page

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

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

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

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

4 Symbols ................................................................................................................................................. 4

5 Requirements ........................................................................................................................................ 4

5.1 Ball size.................................................................................................................................................. 4

5.2 Quality of geometry and surface......................................................................................................... 4

5.3 Sorting accuracy and ball gauges ...................................................................................................... 5

6 Material .................................................................................................................................................. 5

7 Dimensions and tolerances ................................................................................................................. 5

Annex A (normative) Method for assessment of deviation from spherical form ........................................ 8

Annex B (normative) Illustration of ball gauges and sorting principles ...................................................... 9

Annex C (informative) Examples of defect types and methods of inspection........................................... 11

Bibliography ..................................................................................................................................................... 12

© ISO 2008 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 3290-2:2008(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 3290-2 was prepared by Technical Committee ISO/TC 4, Rolling bearings.

ISO 3290 consists of the following parts, under the general title Rolling bearings — Balls:

⎯ Part 1: Steel balls
⎯ Part 2: Ceramic balls
iv © ISO 2008 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 3290-2:2008(E)
Rolling bearings — Balls —
Part 2:
Ceramic balls
1 Scope

This part of ISO 3290 specifies requirements for finished silicon nitride balls for rolling bearings.

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 1132-1, Rolling bearings — Tolerances — Part 1: Terms and definitions

ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and

procedures for the assessment of surface texture
ISO 5593, Rolling bearings — Vocabulary

ISO/TS 12181-1, Geometrical Product Specifications (GPS) — Roundness — Part 1: Vocabulary and

parameters of roundness
ISO 15241, Rolling bearings — Symbols for quantities

ISO 26602:— Fine ceramics (advanced ceramics, advanced technical ceramics) — Silicon nitride materials

for rolling bearing balls
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1132-1, ISO 5593 and the following

apply.
3.1
nominal ball diameter
diameter value which is used for the general identification of a ball size
[ISO 5593:1997, 05.04.01]
1) To be published.
© ISO 2008 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 3290-2:2008(E)
3.2
single ball diameter
distance between two parallel planes tangential to the actual surface of a ball
[ISO 5593:1997, 05.04.02]
3.3
mean ball diameter

arithmetical mean of the largest and the smallest of the single diameters of a ball

[ISO 5593:1997, 05.04.03]
3.4
variation of ball diameter

difference between the largest and the smallest of the single diameters of a ball

[ISO 5593:1997, 05.04.04]
3.5
deviation from spherical ball surface

various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and

repeated around the ball surface
NOTE The deviations to which limits can be attributed are:
⎯ deviation from spherical form;
⎯ waviness;
⎯ surface roughness;
⎯ surface defect.
3.5.1
deviation from spherical form

radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their

centres common to the least squares sphere centre
NOTE This definition supersedes ISO 5593:1997, 05.06.03.
3.5.2
waviness

surface irregularities of random or periodical deviation from the ideal spherical form

NOTE 1 Waviness can be evaluated as velocity amplitude by default.

NOTE 2 In practice, the waviness components are separated from the real surface by a waviness analyser (filters).

3.5.3
surface roughness

surface irregularities with relatively small spacings, which usually include irregularities resulting from the

method of manufacture being used and/or other influences

NOTE These irregularities are considered within the limits that are conventionally defined, e.g., within the limits of the

sampling length.
3.5.4
surface defect

element, irregularity or group of elements and irregularities of the real surface, unintentionally or accidentally

caused during manufacture, storage, handling or use of the surface
2 © ISO 2008 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 3290-2:2008(E)

NOTE 1 These types of element or irregularity differ considerably from those constituting the surface roughness and

are not considered during the measurement of the surface roughness.

NOTE 2 The limits for surface defects are not specified in this part of ISO 3290.

3.6
ball lot

definite quantity of balls manufactured under conditions presumed uniform and which is considered as an

entity
[ISO 5593:1997, 05.04.05]
3.7
mean diameter of ball lot

arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot

[ISO 5593:1997, 05.04.06]
3.8
variation of ball lot diameter

difference between the mean diameters of the largest ball and the smallest ball in a ball lot

[ISO 5593:1997, 05.04.07]
3.9
ball grade

specific combination of dimensional, form, surface roughness and sorting tolerances for balls

[ISO 5593:1997, 05.04.08]
NOTE Ball grade is identified by the letter G and a number, e.g. G 20.
3.10
ball gauge

amount by which the mean diameter of ball lot should differ from the nominal ball diameter, this amount being

one of an established series
[ISO 5593:1997, 05.04.09]
NOTE 1 Eac
...

SLOVENSKI STANDARD
SIST ISO 3290-2:2009
01-maj-2009
.RWDOQLOHåDML.URJOLFHGHO.HUDPLþQHNURJOLFH
Rolling bearings - Balls - Part 2: Ceramic balls
Wälzlager - Rollenelemente - Teil 2: Keramikkugeln
Roulements - Billes - Partie 2: Billes de roulement en céramique
Ta slovenski standard je istoveten z: ISO 3290-2:2008
ICS:
21.100.20 Kotalni ležaji Rolling bearings
SIST ISO 3290-2:2009 en,fr

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

---------------------- Page: 1 ----------------------
SIST ISO 3290-2:2009
---------------------- Page: 2 ----------------------
SIST ISO 3290-2:2009
INTERNATIONAL ISO
STANDARD 3290-2
First edition
2008-12-15
Rolling bearings — Balls —
Part 2:
Ceramic balls
Roulements — Billes —
Partie 2: Billes de roulement en céramique
Reference number
ISO 3290-2:2008(E)
ISO 2008
---------------------- Page: 3 ----------------------
SIST ISO 3290-2:2009
ISO 3290-2:2008(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2008

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 2008 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 3290-2:2009
ISO 3290-2:2008(E)
Contents Page

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

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

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

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

4 Symbols ................................................................................................................................................. 4

5 Requirements ........................................................................................................................................ 4

5.1 Ball size.................................................................................................................................................. 4

5.2 Quality of geometry and surface......................................................................................................... 4

5.3 Sorting accuracy and ball gauges ...................................................................................................... 5

6 Material .................................................................................................................................................. 5

7 Dimensions and tolerances ................................................................................................................. 5

Annex A (normative) Method for assessment of deviation from spherical form ........................................ 8

Annex B (normative) Illustration of ball gauges and sorting principles ...................................................... 9

Annex C (informative) Examples of defect types and methods of inspection........................................... 11

Bibliography ..................................................................................................................................................... 12

© ISO 2008 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 3290-2:2009
ISO 3290-2:2008(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 3290-2 was prepared by Technical Committee ISO/TC 4, Rolling bearings.

ISO 3290 consists of the following parts, under the general title Rolling bearings — Balls:

⎯ Part 1: Steel balls
⎯ Part 2: Ceramic balls
iv © ISO 2008 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 3290-2:2009
INTERNATIONAL STANDARD ISO 3290-2:2008(E)
Rolling bearings — Balls —
Part 2:
Ceramic balls
1 Scope

This part of ISO 3290 specifies requirements for finished silicon nitride balls for rolling bearings.

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 1132-1, Rolling bearings — Tolerances — Part 1: Terms and definitions

ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and

procedures for the assessment of surface texture
ISO 5593, Rolling bearings — Vocabulary

ISO/TS 12181-1, Geometrical Product Specifications (GPS) — Roundness — Part 1: Vocabulary and

parameters of roundness
ISO 15241, Rolling bearings — Symbols for quantities

ISO 26602:— Fine ceramics (advanced ceramics, advanced technical ceramics) — Silicon nitride materials

for rolling bearing balls
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1132-1, ISO 5593 and the following

apply.
3.1
nominal ball diameter
diameter value which is used for the general identification of a ball size
[ISO 5593:1997, 05.04.01]
1) To be published.
© ISO 2008 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 3290-2:2009
ISO 3290-2:2008(E)
3.2
single ball diameter
distance between two parallel planes tangential to the actual surface of a ball
[ISO 5593:1997, 05.04.02]
3.3
mean ball diameter

arithmetical mean of the largest and the smallest of the single diameters of a ball

[ISO 5593:1997, 05.04.03]
3.4
variation of ball diameter

difference between the largest and the smallest of the single diameters of a ball

[ISO 5593:1997, 05.04.04]
3.5
deviation from spherical ball surface

various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and

repeated around the ball surface
NOTE The deviations to which limits can be attributed are:
⎯ deviation from spherical form;
⎯ waviness;
⎯ surface roughness;
⎯ surface defect.
3.5.1
deviation from spherical form

radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their

centres common to the least squares sphere centre
NOTE This definition supersedes ISO 5593:1997, 05.06.03.
3.5.2
waviness

surface irregularities of random or periodical deviation from the ideal spherical form

NOTE 1 Waviness can be evaluated as velocity amplitude by default.

NOTE 2 In practice, the waviness components are separated from the real surface by a waviness analyser (filters).

3.5.3
surface roughness

surface irregularities with relatively small spacings, which usually include irregularities resulting from the

method of manufacture being used and/or other influences

NOTE These irregularities are considered within the limits that are conventionally defined, e.g., within the limits of the

sampling length.
3.5.4
surface defect

element, irregularity or group of elements and irregularities of the real surface, unintentionally or accidentally

caused during manufacture, storage, handling or use of the surface
2 © ISO 2008 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 3290-2:2009
ISO 3290-2:2008(E)

NOTE 1 These types of element or irregularity differ considerably from those constituting the surface roughness and

are not considered during the measurement of the surface roughness.

NOTE 2 The limits for surface defects are not specified in this part of ISO 3290.

3.6
ball lot

definite quantity of balls manufactured under conditions presumed uniform and which is considered as an

entity
[ISO 5593:1997, 05.04.05]
3.7
mean diameter of ball lot

arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot

[ISO 5593:1997, 05.04.06]
3.8
variation of ball lot diameter

difference between the mean diameters of the largest ball and the smallest ball in a ball lot

[ISO 5593:1997, 05.04.07]
3.9
ball grade
specific comb
...

NORME ISO
INTERNATIONALE 3290-2
Première édition
2008-12-15
Roulements — Billes —
Partie 2:
Billes de roulement en céramique
Rolling bearings — Balls —
Part 2: Ceramic balls
Numéro de référence
ISO 3290-2:2008(F)
ISO 2008
---------------------- Page: 1 ----------------------
ISO 3290-2:2008(F)
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DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2008

Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous

quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit

de l'ISO à l'adresse ci-après ou du comité membre de l'ISO dans le pays du demandeur.

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
Publié en Suisse
ii © ISO 2008 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 3290-2:2008(F)
Sommaire Page

Avant-propos..................................................................................................................................................... iv

1 Domaine d'application.......................................................................................................................... 1

2 Références normatives ........................................................................................................................ 1

3 Termes et définitions............................................................................................................................ 1

4 Symboles ............................................................................................................................................... 4

5 Exigences .............................................................................................................................................. 4

5.1 Dimension des billes ............................................................................................................................ 4

5.2 Qualités géométriques et de surface.................................................................................................. 5

5.3 Exactitude du classement et classes de billes.................................................................................. 5

6 Matériaux ............................................................................................................................................... 5

7 Dimensions et tolérances .................................................................................................................... 5

Annexe A (normative) Méthode d'évaluation de l'écart de sphéricité .......................................................... 8

Annexe B (normative) Illustration des classes de bille et des principes de classement ........................... 9

Annexe C (informative) Exemples de défauts types et méthodes de vérification..................................... 11

Bibliographie .................................................................................................................................................... 12

© ISO 2008 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 3290-2:2008(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de

normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée

aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du

comité technique créé à cet effet. Les organisations internationales, gouvernementales et non

gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec

la Commission électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.

Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI,

Partie 2.

La tâche principale des comités techniques est d'élaborer les Normes internationales. Les projets de Normes

internationales adoptés par les comités techniques sont soumis aux comités membres pour vote. Leur

publication comme Normes internationales requiert l'approbation de 75 % au moins des comités membres

votants.

L'attention est appelée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable de ne

pas avoir identifié de tels droits de propriété et averti de leur existence.
L'ISO 3290-2 a été élaborée par le comité technique ISO/TC 4, Roulements.

L'ISO 3290 comprend les parties suivantes, présentées sous le titre général Roulements — Billes:

⎯ Partie 1: Billes de roulement en acier
⎯ Partie 2: Billes de roulement en céramique
iv © ISO 2008 – Tous droits réservés
---------------------- Page: 4 ----------------------
NORME INTERNATIONALE ISO 3290-2:2008(F)
Roulements — Billes —
Partie 2:
Billes de roulement en céramique
1 Domaine d'application

La présente partie de l'ISO 3290 fixe les exigences relatives aux billes finies, en nitrure de silicium, utilisées

pour les roulements.
2 Références normatives

Les documents de référence suivants sont indispensables pour l'application du présent document. Pour les

références datées, seule l'édition citée s'applique. Pour les références non datées, la dernière édition du

document de référence s'applique (y compris les éventuels amendements).
ISO 1132-1, Roulements — Tolérances — Partie 1: Termes et définitions

ISO 4288, Spécification géométrique des produits (GPS) — État de surface: Méthode du profil — Règles et

procédures pour l'évaluation de l'état de surface
ISO 5593, Roulements — Vocabulaire

ISO/TS 12181-1, Spécification géométrique des produits (GPS) — Circularité — Partie 1: Vocabulaire et

paramètres de circularité
ISO 15241, Roulements — Symboles relatifs aux grandeurs

ISO 26602:— , Céramiques techniques — Matériaux en nitrure de silicium pour roulements à billes

3 Termes et définitions

Pour les besoins du présent document, les termes et définitions donnés dans l'ISO 1132-1, l'ISO 5593 ainsi

que les suivants s'appliquent.
3.1
diamètre nominal de bille

diamètre de définition, utilisé d'une manière générale pour indiquer la taille d'une bille

[ISO 5593:1997, 05.04.01]
1) À publier.
© ISO 2008 – Tous droits réservés 1
---------------------- Page: 5 ----------------------
ISO 3290-2:2008(F)
3.2
diamètre isolé d'une bille
distance entre deux plans parallèles tangents à la surface réelle d'une bille
[ISO 5593:1997, 05.04.02]
3.3
diamètre moyen d'une bille

moyenne arithmétique entre le plus grand et le plus petit des diamètres isolés d'une bille

[ISO 5593:1997, 05.04.03]
3.4
variation de diamètre d'une bille
différence entre le plus grand et le plus petit des diamètres isolés d'une bille
[ISO 5593:1997, 05.04.04]
3.5
écart par rapport à la surface d'une bille sphérique

tout type d'écart par rapport à la surface sphérique parfaite d'une bille, distribué et répété non uniformément

ou uniformément autour de la surface d'une bille
NOTE Les écarts auxquels des limites peuvent être allouées sont les suivants:
⎯ écarts de sphéricité;
⎯ ondulation;
⎯ rugosité de surface;
⎯ défaut de surface.
3.5.1
écart de sphéricité

distance radiale entre la plus petite sphère circonscrite et la plus grande sphère inscrite ayant leur centre

commun au centre de la sphère des moindres carrés
NOTE Cette définition remplace l'ISO 5593:1997, 05.06.03.
3.5.2
ondulation

irrégularités de surface présentant un écart aléatoire ou périodique par rapport à la sphère idéale

NOTE 1 Par défaut, une ondulation peut être évaluée comme une amplitude de vitesse.

NOTE 2 En pratique, les composantes d'une ondulation sont discriminées à partir de la surface réelle par un analyseur

d'ondulation (filtres).
3.5.3
rugosité de surface

irrégularités de surface relativement faiblement espacées, qui englobent habituellement les irrégularités

résultant du processus de fabrication mis en œuvre et/ou d'autres facteurs d'influence

NOTE Ces irrégularités sont considérées dans des limites définies conventionnellement, par exemple dans les

limites de la longueur de base.
2 © ISO 2008 – Tous droits réservés
---------------------- Page: 6 ----------------------
ISO 3290-2:2008(F)
3.5.4
défaut de surface

élément, irrégularité ou groupe d'éléments et d'irrégularités de la surface réelle, provoqués non

intentionnellement ou accidentellement pendant la fabrication, le stockage, la manutention ou l'utilisation de la

surface

NOTE 1 Ces types d'éléments ou d'irrégularités diffèrent considérablement de ceux constitutifs de la rugosité de

surface et ne sont pas pris en compte au cours du mesurage de la rugosité de surface.

NOTE 2 Les limites des défauts de surface ne sont pas spécifiées dans la présente partie de l'ISO 3290.

3.6
lot de billes

quantité donnée de billes fabriquées dans des conditions réputées uniformes, considérée comme un

ensemble
[ISO 5593:1997, 05.04.05]
3.7
diamètre moyen d'un lot de billes

moyenne arithmétique entre le diamètre moyen de la plus grande et celui de la plus petite des billes d'un lot

[ISO 5593:1997, 05.04.06]
3.8
variation de diamètre d'un lot de billes

différence entre le diamètre moyen de la plus grande et celui de la plus petite des billes d'un lot

[ISO 5593:1997, 05.04.07]
3.9
grade de bille

ensemble de tolérances associées aux dimensions, à la forme, à la rugosité et au classement des billes

[ISO 5593:1997, 05.04.08]

NOTE Le grade de bille est désigné par la lettre G et un nombre, par exemple G 20.

3.10
classe de bille

choisie dans une série préétablie, valeur dont il convient que le diamètre moyen d'un lot de billes donné

s'écarte du diamètre nominal de bille
[ISO 5593:1997, 05.04.09]

NOTE 1 Chaque classe de bille s'exprime par un multiple entier de l'intervalle de classement correspondant au grade

de bille considéré.
NOTE 2 Une classe de bille, associée au grade de bille et au diamèt
...

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