SIST EN ISO 10360-2:1998
(Main)Coordinate metrology - Part 2: Performance assessment of coordinate measuring machines (ISO 10360-2:1994)
Coordinate metrology - Part 2: Performance assessment of coordinate measuring machines (ISO 10360-2:1994)
Migrated from Progress Sheet (TC Comment) (2000-07-10): Finalization problems in ISO (see letter from Grode dated 1993-11-15)
Koordinatenmeßtechnik - Beurteilung der Leistungsfähigkeit von Koordinatenmeßgeräten (ISO 10360-2:1994)
Dieser Teil von ISO 10360 legt fest: a) Die Annahmeprüfung, die bestätigt, daß die Leistungsfähigkeit des Koordinatenmaßgerätes (KMG) und des Tastsystems den Angaben des Herstellers entsprechen; b) Die Bestätigungs- prüfung, die es dem Benutzer ermöglicht, die Leistungsfähigkeit des KMG und seines Tastsystems turnusmäßig zu bestätigen, und c) Zwischenprüfung (Überwachung), die es dem Benutzer ermöglicht, ein KMG und sein Tastsystem durch Prüfungen zwischen den regulären Bestätigungsprüfungen zu überwachen (siehe Anhang A).
Métrologie par coordonnées - Partie 2: Evaluation des performances des machines a mesurer tridimensionnelles (ISO 10360-2:1995)
Coordinate metrology - Part 2: Performance assessement of coordinate measuring machines
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10360-2:1998
01-avgust-1998
Coordinate metrology - Part 2: Performance assessement of coordinate measuring
machines
Coordinate metrology - Part 2: Performance assessment of coordinate measuring
machines (ISO 10360-2:1994)
Koordinatenmeßtechnik - Beurteilung der Leistungsfähigkeit von
Koordinatenmeßgeräten (ISO 10360-2:1994)
Métrologie par coordonnées - Partie 2: Evaluation des performances des machines a
mesurer tridimensionnelles (ISO 10360-2:1995)
Ta slovenski standard je istoveten z: EN ISO 10360-2:1995
ICS:
17.040.30 Merila Measuring instruments
SIST EN ISO 10360-2:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 10360-2:1998
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SIST EN ISO 10360-2:1998
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SIST EN ISO 10360-2:1998
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SIST EN ISO 10360-2:1998
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SIST EN ISO 10360-2:1998
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SIST EN ISO 10360-2:1998
IS0 10360=2:1994(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 10360-2 was prepared by Technical Committee
ISO/TC 3, Limits and fits.
IS0 10360 consists of the following parts, under the general title Coordi-
na te metrology.
- Part 2: Performance assessment of coordinate measuring machines
- Part 3: Performance test for CMMs with a rotary axis as the fourth
axis
Annexes A and B of this part of IS0 10360 are for information only.
0 IS0 1994
All rights reserved. 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 per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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SIST EN ISO 10360-2:1998
IS0 10360=2:1994(E)
Introduction
The primary assessment of the performance of a coordinate measuring
machine (CMM) is, where practicable, a length-measuring task. The rea-
sons for this approach are:
- to make the test conform, as closely as possible, to a frequently-
performed measurement procedure;
- to provide well-defined traceability to the unit length, the metre.
The test of the probing system is intended to assess probing errors, in-
cluding those not revealed by the acceptance test, associated with the
contacting type of CMM probing system operating in the discrete-point
measuring mode.
Because it is not possible to completely isolate the probing errors from
other sources of machine error, some measurement errors, of both static
and dynamic origin, inherent in the other parts of the CMM measuring
system will also be measured by this test.
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SIST EN ISO 10360-2:1998
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SIST EN ISO 10360-2:1998
INTERNATIONAL STANDARD IS0 10360=2:1994(E)
Coordinate metrology -
Part 2:
Performance assessment of coordinate measuring
machines
IS0 3650: 1978, Gauge blocks.
1 Scope
VI M, International Vocabulary of Basic and General
This part of IS0 10360 specifies:
Terms in Metrology.
a) the acceptance test, which verifies that the per-
formance of a coordinate measuring machine
3 Definitions
(CMM) and the CMM probing system is as stated
by the manufacturer;
For the purposes of this part of IS0 10360, the fol-
lowing definitions apply.
b) the reverification test, which enables the user to
reverify CMM performance and the CMM probing
3.1 coordinate measuring machine (CMM):
system periodically;
Measuring device, the base of which is fixed in place
during use, designed to take measurements from at
c) the interim check (see annex A), which enables
least three linear or angular displacements generated
the user to make checks on a CMM and the CMM
by the machine. At least one of the three displace-
probing system between regular reverification
ments shall be linear measurement.
tests;
in relation to the three-dimensional error of length
3.2 error of indication of a CMM: Indication of a
measurement of a CMM capable of measuring
CMM minus the (conventional) true value of the
Cartesian, cylindrical or spherical coordinates of points
measurand.
in space. A limited number of tests is carried out, but
their locations may be anywhere within the working
NOTE 1 Error of indication includes the error of the ma-
terial standard of length.
volume of the CMM. Three nonredundant axes (ex-
cluding the axes associated with the probe system)
shall be tested. 3.3 uncertainty of dimensional measurement:
Estimate characterizing the range of values within
which the true value of a measurand lies.
2 Normative references
3.4 material standard: Material measure reproduc-
The following standards contain provisions which,
ing a known value of a dimensional quantity (length,
through reference in this text, constitute provisions
diameter, etc.) which is traceable to national stan-
of this part of IS0 10360. At the time of publication,
dards, and is used for the verification test of a CMM.
the editions indicated were valid. All standards are
subject to revision, and parties to agreements based
3.5 material standard of length: Material standard
on this part of IS0 10360 are encouraged to investi-
containing two or more nominally parallel planes, the
gate the possibility of applying the most recent edi-
distance between these planes being specified.
tions of the standards indicated below. Members of
IEC and IS0 maintain registers of currently valid Examples of material standards of length are
NOTE 2
International Standards. gauge blocks according to IS0 3650 and step gauges.
1
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SIST EN ISO 10360-2:1998
IS0 10360=2:1994(E)
3.6 error of indication of a CMM for length
4 Acceptance test and periodic
measurement, E: By convention, the error with
reverification of the CMM
which the length of the material standard can be de-
termined with a CMM, the measurement being taken
through two opposite points on two nominally parallel
4;l Operating conditions
planes, normal to one of the planes, when the points
are approached from opposite directions.
Before beginning the tests given in 4.2 and 4.3, the
The error of indication of a CMM for length measure- CMM shall be operated using the procedures as
ment, E, expressed in micrometres, is stated in one specified in the manufacturer’s instruction manual, for
of three forms: example:
E=A+L/K< B, or a) machine start-up;
b) probe qualification;
E =A+L/K, or
E=B c) probe configuration.
The necessary information should be provided by the
where
manufacturer.
A is a constant, expressed in micrometres
For the tests given in 4.2 and 4.3, the environmental
and supplied by the CMM manufacturer;
and operating conditions recommended by the
manufacturer shall apply.
K is a dimensionless constant supplied by
the CMM manufacturer;
L
is the measured length, in millimetres;
4.2 Acceptance test
B is the maximum value of E, in microme-
tres, as stated by the CMM manufacturer.
4.2.1 Principle
The expressions apply for any position or orientation
To establish whether the CMM is capable of measur-
of the material standard within the CMM.
ing within the manufacturer’s stated value of E, values
of the error. of length measurement, AL, are deter-
Measurements shall be made utilising the three axes
mined.
of the machine to which the manufacturer has stated
that the quoted value of E applies.
4.2.2 Apparatus
3.7 error of indication of a CMM for periodic re-
verification, V: Error of indication chosen by the user
4.2.2.1 Coordinate measuring machine to be
for the periodic reverification test, according to the
tested (see 3.1).
user’s requirements and use of the machine.
4.2.2.2 Material standard of length, either a step
3.8 probing error, R: By convention, the error within
gauge or a series of gauge blocks conforming to
which the range of radii of a material standard can be
determined with a CMM, the measurements being IS0 3650 being strongly recommended.
taken using a sphere as substrate.
It is recommended that
R is a positive constant error whose value is supplied
.
- the longest length of the material standard is at
by the CMM manufacturer.
least 66 % of the longest space diagonal;
The value of R applies for any location of the material
standard within the working volume of the CMM and
- the shortest length of the material standard is less
for any probing direction.
than 30 mm.
If a manufacturer’s material standard is used, then no
3.9 probing error for periodic reverification, S:
additional uncertainty shall be added to the value of
Probing error chosen by the user for the periodic re-
E. If a user’s material standard is used, and if the un-
verification test, according to the user’s requirements
certainty of the user’s material standard, F, is greater
and use of the machine.
than 20 % of the value of E, then E shall be redefined
as the sum of E and F.
3.10 radial distance, r: Distance between the cen-
tre of the Gaussian (least-squares) sphere (substi- The manufacturer’s material standard shall have a
tution element) and the probed point. calibration uncertainty no greater than 20 % of E.
2
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SIST EN ISO 10360-2:1998
IS0 10360=2:1994(E)
4.2.3 Test procedure 4.3 Periodic reverification
Carry out the test procedure and calculation of results
4.2.3.1 Measure the material standard of length in
as specified in 4.2.
any seven different configurations (combinations of
position and orientation), chosen at the discretion of
The performance of the CMM is reverified if the con-
the user, making only bidirectional measurements ei-
ditions in 4.2.5 are satisfied when V is substituted for
ther externally or internally.
E.
4.2.3.2 For each of the seven configurations, take
5 Acceptance test and reverification of
and record measurements of five test lengths, each
the CMM probing system
measured three times. (The total number of length
measurements is thus 105.) Measure one point only
5.1 Principle
at each end of the test length for each length
measurement.
The principle of the acceptance method is used to
NOTE 3 Supplementary measurements are normally re- establish whether the CMM is capable of measuring
quired for alignment purposes. It is recommended that the
within the manufacturer’s stated value of R by deter-
alignment method used be consistent with the procedures
mining the range of values of the radial distance r on
used during calibration.
a reference sphere.
5.2 Apparatus
4.2.4 Calculation of results
For each of the 105 measurements, calculate the er- 5.2.1 Coordinate measuring machine probing
ror of length measurement, hL, as the absolute value system to be tested (see 3.1).
of the difference between the indicated value and the
The user is free to choose the configuration of the
true value of the relevant test length.
stylus components of the probe, within the limits
The indicated value of a particular measurement (of a specified by the manufacturer.
particular test length in a particular configuration) may
be corrected to account for systematic errors if the
5.2.2 Certified reference sphere, having
CMM has accessory devices to correct systematic
instrument errors, or software for this purpose. Man-
- diameter between IO mm and 50 mm inclusive;
ual correction of the result obtained from the com-
puter output to take account of temperature or other
NOTE 4 Spheres up to 30 mm in diameter are com-
corrections shall not be allowed when the environ- monly used.
mental conditions recommended by the manufacturer
- errors of certified form no greater than R/5.
apply l
The sphere supplied with the CMM for probe-
The true value of the test length is taken as the cali-
qualifying purposes shall not be used for this test.
brated length between the measuring faces of the
material standard. This value should be temperature-
The sphere should be mounted rigidly to avoid errors
corrected only if this facility is normally available in the
due to bending.
software of the CMM under test.
5.3 Test procedure
4.2.5 Interpretation of results
5.3.1 Select the probe configuration, either one .of
The performance of the CMM is verified if none of the
the seven configurations used for length measure-
105 values of error of length measurement (converted
ment (see 4.2.3.1) or a different configuration.
to micrometres) obtained as in 4.2.4 is greater than
the manufacturer’s stated value of E.
NOTE 5 It is recommended that the orientation of the
stylus is not parallel to any CMM axis.
A maximum of five of the 35 test length measure-
ments may have one of the three replicate values of
5.3.2 Set up and qualify the probe in accordance
the error of length measurement greater than E. Each
with the manufacturer’s procedures.
such test length shall have the measurement that is
out of tolerance repeated ten times at the relevant
5.3.3 Take and record a pattern of 25 points in ran-
configuration.
dom order on the reference sphere. The distribution
If all the values of the error of length measurement of points should be as nearly uniform as practical over
from the repeat measurements are within E, then the a hemisphere. The orientation of the hemisphere
performance of the CMM is verified. chosen is at the discretion of the user.
3
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SIST EN ISO 10360-2:1998
IS0 10360=2:1994(E)
If the range exceeds the manufacturer’s stated value
5.4 .Calculation of results
of R, the probing system should be thoroughly
checked and the test should be repeated once, start-
Using all 25 measurements, compute the centre of
ing from requalification of the probe. If the range of
the Gaussian (least-squares) sphere (substitution ele-
values of r from the repeat measurements is within
ment). For each of the 25 measurements, calculate
the value of R, then the performance of the probe is
the radius, r.
verified.
5.5 Interpretation of results
5.6 Periodic reverification
The performance of the probing system is verified if
Carry out the test procedure and calculation of results
of the 25 radial distances ob-
the range rmax - rmin
as specified in clause 5.
tained in accordance with 5.4 is no greater than the
manufacturer’s stated value of R.
The performance of the CMM probing system is re-
verified if the conditions in 5.5 are satisfied.
4
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SIST EN ISO 10360-2:1998
IS0 10360=2:1994(E) '
Annex A
(informative)
Interim checking
which has a surface finish that does not signifi-
A.1 Interim machine checking of the
cantly affect the uncertainty of measurement;
CMM
...
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