SIST ISO 3548-3:2015

INTERNATIONAL ISO
STANDARD 3548-3
First edition
2012-12-01
Plain bearings — Thin-walled half
bearings with or without flange —
Part 3:
Measurement of peripheral length
Paliers lisses — Demi-coussinets minces à collerette ou sans collerette —
Partie 3: Mesurage de la longueur développée
Reference number
©
ISO 2012
© ISO 2012
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Purpose of checking . 3
6 Checking methods . 4
6.1 Method A . 4
6.2 Method B . 4
7 Choice and designation of checking method . 5
7.1 Choice of checking method . 5
7.2 Designation of checking method . 6
8 Measuring equipment . 6
9 Measuring equipment requirements . 8
9.1 General . 8
9.2 Tolerance on checking load setting . 8
9.3 Speed of approach of measuring head . 9
9.4 Construction of measuring head . 9
9.5 Accuracy of the measuring plane for metering bars . 9
9.6 Accuracy of the dial gauge . 9
10 Gauging tools for establishing the datum . 9
10.1 General . 9
10.2 Master checking block (used alone) .10
10.3 Series checking block used alone .10
10.4 Series checking block with master shell .10
11 Checking block requirements .10
11.1 General .10
11.2 Reference tooling: master checking block — General .11
11.3 Series gauging tools .13
12 Master shell and comparison shell requirements .15
12.1 Master shell requirements .15
12.2 Comparison shell requirements .17
13 Correction factors .18
13.1 Reference tooling: master checking block correction factor, F .
cor,cbm 18
13.2 Series control tooling .18
13.3 Marking .19
13.4 Reference setting .19
14 Typical checking procedure.19
15 Conditions of the half bearings to be checked .20
16 Measuring errors .20
16.1 Errors due to measuring equipment .20
16.2 Errors due to the checking block.20
16.3 Errors due to the correction factor .21
16.4 Errors due to the half bearing .21
16.5 Error due to the choice of checking method .21
17 Accuracy of methods used .21
17.1 Checking conditions .21
17.2 Limits .21
17.3 Calculation .21
18 Specifications on bearing drawings .21
19 Specifications for the control of the checking means .21
Annex A (normative) Determination of the correction factor of the master checking block —
Method A .23
Annex B (normative) Determination of the correction factor of the master checking block —
Method B .27
Annex C (normative) Determination of the correction factor of the series checking block
used alone .31
Annex D (normative) Determination of the correction factor of the master shell or
comparison shell .33
Annex E (normative) Tests and calculation of repeatability, reproducibility and comparability .35
iv © ISO 2012 – All rights reserved

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 3548-3 was prepared by Technical Committee ISO/TC 123, Plain Bearings, Subcommittee SC 5,
Quality analysis and assurance.
This first edition of ISO 3548-3 cancels and replaces ISO 6524:1992, which has been technically revised.
ISO 3548 consists of the following parts, under the general title Plain bearings — Thin walled half bearings
with or without flange:
— Part 1: Tolerances, design features and methods of test
— Part 2: Measurement of wall thickness and flange thickness
— Part 3: Measurement of peripheral length
INTERNATIONAL STANDARD ISO 3548-3:2012(E)
Plain bearings — Thin-walled half bearings with or
without flange —
Part 3:
Measurement of peripheral length
1 Scope
This part of ISO 3548 specifies, according to ISO 12301, the checking of the peripheral length of thin-
walled half bearings with or without flange, and describes the necessary checking methods and
measuring equipment.
Thin-walled half bearings are flexible and, in the free condition, do not conform to a cylindrical profile.
This is one reason the peripheral length of the half bearings can only be measured under a constraining
load by use of specialized measuring equipment.
In addition, measuring equipment different from that illustrated in this part of
...