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SLOVENSKI STANDARD
01-junij-2016
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Geometrische Produktspezifikation (GPS) - Leitfaden zur Ermittlung der Testunsicherheit
von Koordinatenmessgeräten (KMG) bei KMGs mit berührenden Einfach- und
Mehrfachtastersystemen (ISO/FDIS 17865:2016)
Spécification géométrique des produits (GPS) - Lignes directrices pour l'estimation de
l'incertitude d'essai des machines à mesurer tridimensionnelles (MMT) pour MMT
utilisant des systèmes de palpage à stylet simple (ISO/FDIS 17865:2016)
Ta slovenski standard je istoveten z: prEN ISO 17865
ICS:
17.040.30 Merila Measuring instruments
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND *36 Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL ISO/TS
SPECIFICATION 17865
First edition
Geometrical product specifications
(GPS) — Guidelines for the evaluation
of coordinate measuring machine
(CMM) test uncertainty for CMMs
using single and multiple stylus
contacting probing systems
Spécification géométrique des produits (GPS) — Lignes directrices
pour l’estimation de l’incertitude d’essai des machines à mesurer
tridimensionnelles (MMT) pour MMT utilisant des systèmes de
palpage à stylet simple et à stylets multiples
PROOF/ÉPREUVE
Reference number
ISO/TS 17865:2016(E)
©
ISO 2016
ISO/TS 17865:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
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www.iso.org
ii PROOF/ÉPREUVE © ISO 2016 – All rights reserved
ISO/TS 17865:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test value uncertainty evaluation . 2
4.1 Effects of fixturing and bending of the test sphere stem . 2
4.2 Form of the test sphere . 2
4.3 Test of the probing system form error. 2
4.4 Test of the probing system size value . 3
4.5 Test of the probing system location value . 4
Annex A (informative) Using roundness to approximate form . 5
Annex B (informative) Relation to the GPS matrix model . 7
Bibliography . 8
ISO/TS 17865:2016(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 WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 213, Dimensional and geometrical product
specifications and verification.
iv PROOF/ÉPREUVE © ISO 2016 – All rights reserved
ISO/TS 17865:2016(E)
Introduction
This Technical Specification is a geometrical product specification (GPS) document and is to be regarded
as a general GPS document (see ISO 14638). It influences chain links F of the chain of standards in the
general GPS matrix model.
For more detailed information of the relation of this Technical Specification to the GPS matrix
model, see Annex B.
The ISO GPS Matrix Model given in ISO 14638 gives an overview of the ISO GPS system of which this
Technical Specification is a part. The fundamental rules of ISO GPS given in ISO 8015 apply to this
Technical Specification. The default decision rules given in ISO 14253-1 apply to specifications made in
accordance with this Technical Specification, unless otherwise stated.
This Technical Specification gives guidance for the evaluation of the test value uncertainty as required
by the application of ISO 10360-5.
Before starting any test value uncertainty evaluation, it is recommended that
— the distinction between the test value uncertainty and the measurement uncertainty is fully
understood (the former is used to reduce the acceptance zone in a test, the latter to quantify the
reliability of a measurement value) and
— the principle of the tester’s responsibility in deciding whether or not to include an uncertainty
component in the budget is also understood.
Some details of the above issues are given in ISO/TS 23165, the careful reading of which is recommended.
TECHNICAL SPECIFICATION ISO/TS 17865:2016(E)
Geometrical product specifications (GPS) — Guidelines for
the evaluation of coordinate measuring machine (CMM)
test uncertainty for CMMs using single and multiple stylus
contacting probing systems
1 Scope
This Technical Specification describes how to evaluate the test value uncertainty when testing is
performed according to ISO 10360-5.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 10360-1, Geometrical Product Specifications (GPS) — Acceptance and reverification tests for coordinate
measuring machines (CMM) — Part 1: Vocabulary
ISO 10360-5:2010, Geometrical product specifications (GPS) — Acceptance and reverification tests
for coordinate measuring machines (CMM) — Part 5: CMMs using single and multiple stylus contacting
probing systems
ISO 14253-1:1998, Geometrical product specifications (GPS) — Inspection by measurement of workpieces
and measuring equipment — Part 1: Decision rules for proving conformity or nonconformity with
specifications
ISO 17450-2, Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets,
specifications, operators, uncertainties and ambiguities
ISO/TS 23165, Geometrical product specifications (GPS) — Guidelines for the evaluation of coordinate
measuring machine (CMM) test uncertainty
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated
terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10360-1, ISO 10360-5,
ISO 14253-1, ISO 17450-2, ISO/TS 23165, ISO/IEC Guide 98-3 and ISO/IEC Guide 99 apply.
ISO/TS 17865:2016(E)
4 Test value uncertainty evaluation
4.1 Effects of fixturing and bending of the test sphere stem
The following contributors may be relevant in some applications.
— Fixturing of the test sphere: if the test sphere is fixtured loosely or vibrations are present, the test
sphere may shift during the measurements, due to, for example, probing forces, vibrations and
inertial forces.
— Bending of the test sphere stem: if the test sphere stem is insufficiently rigid, the bending due to
probing forces may be a significant source of test value uncertainty.
The influence of these effects can be measured using a displacement sensor (such as a precision
indicator or capacitance gauge) when a force equivalent to the probing force (i.e., the force at the instant
of point detection) is applied to the test sphere. The distance of this displacement is called d
FIXTURING
for the purposes of this Technical Specification.
Alternatively, two significantly different probing forces can be used to calculate the P values and then
compared in order to assess these fixturing effects.
4.2 Form of the test sphere
The formulae that follow in the rest of Clause 4 make use of the form and the uncertainty of the form of
the test sphere, which, according to ISO 10360-5:2010, 6.2.3, is to have been calibrated (the form of the
test sphere is the same as its sphericity). It is the form of the test sphere (and not the roundness) that
is to be calibrated. However, if the roundness of the sphere is calibrated instead of using traces about
great circles of the sphere, then, upon agreement of buyer and seller, the roundness calibrations may be
used to estimate the form and its uncertainty by using the adjustment factors as given in Annex A.
4.3 Test of the probing system form error
The recommended formula for the standard uncertainty of the probing error u(P ) is Formula (1):
F--
2 2
F d
SPHERE 2 FIXTURING
uP = +uF + (1)
() ()
F−− SPHERE
2 2
where
is the form of the test sphere;
F
SPHERE
is the standard uncertainty in the form of the test sphere stated in the calibration
uF
()
SPHERE
certificate;
is the displacement due to the probing force.
d
FIXTURING
The one-sided nature of this test means that the typical 95 % confidence level is achieved with a
coverage factor of k = 1,645 instead of the usual k = 2 (the default value given in ISO 14253-1:1998,
Clause 4), which applies to two-sided distributions.
2 PROOF/ÉPREUVE © ISO 2016 – All rights reserved
ISO/TS 17865:2016(E)
The standard uncertainty, u, for the form calibration is found by dividing the expanded uncertainty
U reported in the form calibration certificate by the coverage factor k, u = U/k; the value of k is also
reported in the certificate.
NOTE The above standard uncertainty formula for u(P ) can be an overestimate (see ISO 14253-2) due to
F--
the unknown, complex interaction between the form of the test sphere with the error behaviour during probing.
This overestimation is not problematic for many cases, but in some cases can be problematic when the form of
an available and/or affordable test sphere is not sufficiently
...