WIT Press


Tolerance And Uncertainty

Price

Free (open access)

Paper DOI

10.2495/LAMDAMAP010321

Volume

34

Pages

10

Published

2001

Size

841 kb

Author(s)

W. Knapp

Abstract

This paper describes the influence of the measurement uncertainty to the tolerance, as defined in international standards, and quotes documents on how to estimate measurement uncertainties. For industrial length measurements the principal contributors to the measurement uncertainty are summarised. They are detailed for machine tool acceptance tests, including the relevant contributor for the different types of measurements. Parameters for the volumetric accuracy of coordinate measuring machines (CMMs) and for machine tools are given, as well as the major influences on the overall performance of CMMs and machine tools. 1 The "golden rule" The "golden rule" of metrology states, that the measurement uncertainty shall be less than 10% of the tolerance. If this requirement is fulfilled, there is pract

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