Geometriska produktspecifikationer (GPS)

Kommittébeteckning: SIS/TK 507 (Tekniska produktspecifikationer (TPS))
Källa: CEN
Svarsdatum: den 11 sep 2018
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This document specifies acceptance and periodic reverification tests of CMM performance with contacting probing systems and is only applicable to CMMs using:

— any type of contacting probing system, and

— spherical or hemispherical stylus tip(s).

NOTE CMM probing performance tests are specified by the maximum permissible errors (MPEs), due to the impracticality of isolating the performance of the probing system from that of the CMM, even on a small artefact such as a test sphere.

This document applies to CMMs supplied with any of the following:

a) single-stylus probing system;

b) multi-stylus probing systems with fixed multiple styli attached to a single probe (e.g. "star" stylus);

c) multiple probing systems such as those with a stylus for each of their probes;

d) systems with articulating probing systems;

e) stylus and probe changing systems;

f) manual (non-driven) as well as automated CMMs;

g) installations including a scanning probe and capable of being used in a scanning measuring mode.

This document is not applicable to non-contacting probing systems, which require different testing procedures.

The terms "multi-stylus size error", etc., should strictly be written "combined CMM and multi-stylus probing- system size error", etc. For convenience, the wording has been truncated.

If it is desired to isolate the probing-system performance as far as is practical, the influence of the CMM can be minimized but not eliminated. See Annex C for more information.

Kommittébeteckning: SIS/TK 507 (Tekniska produktspecifikationer (TPS))
Källa: CEN
Svarsdatum: den 21 sep 2018
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This document illustrates the ambiguity caused by the use of dimensional specifications to control properties other than linear and angular size and the benefit of using geometrical specifications instead.

Dimensional tolerancing can be indicated by ± tolerancing or geometrical specifications.

The ambiguity caused by using ± tolerances for dimensions other than linear sizes (for individual tolerances and general tolerances according to, e.g. ISO 2768-1 and ISO 8062-3) is explained in Annex A.

NOTE 1 The figures, as shown in this document, merely illustrate the text and are not intended to reflect actual usage. The figures are consequently simplified to indicate only the relevant principles.

NOTE 2 For indications of dimensional specifications, see the following:

— ISO 14405-1 for linear size;

— ISO 14405-3 for angular size;

— ISO 2538-1 and ISO 2538-2 for wedges;

— ISO 3040 for cones.

NOTE 3 The rules for geometrical specifications are given in ISO 1101.