PROPOSAL FOR UPDATES IN THE GPS STANDARDS CONCERNING COORDINATE MEASUREMENTS UNCERTAINTY

Wojciech Plowucha, Wladyslaw Jakubiec

Abstract

The paper presents arguments for and proposals of changes in the series of standards ISO 15530. In particular, authors propose to change the classification of themethods of uncertainty evaluation, change the title of the ISO 15530-4 and make changes that will facilitate the use of these standards to industrial employees. In authors’ opinion the classification of the uncertainty evaluation methods for coordinate measurements should be based on the models given in ISO 14253-2 and GUM, i.e. the terms of “black box” and “transparent box” as well as type A and B methods. Authors think that both methods included in ISO 15530-3 and ISO/TS 15530-4 are type A evaluation methods. The measurement model for the evaluation described in the part 3 is classic black box model and the method concerned in part 4 – the transparent box model. The analytical methodology developed by authors (EMU-CMMUncertainty TM software) is accounted as type B evaluation and transparent box model. The reasons of lack of interests for the evaluation method with use of calibrated workpiece are presented. Some simplifications to the procedure aswell as extensions to the descriptive part are proposed. It’s pointed out that all methods are “task-specific” and all use the uncertainty budget. It is brought to attention thatthe part 4 applies not only to the simulation but to all methods for which a computer software is provided therefore a proper title change is proposed for this part.

Keywords

uncertainty, coordinate measurements, CMM, geometrical product

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IMEKO-TC14-2013-62.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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