On October 30, 2014 the American National Standards Institute (ANSI) approved QIF v 2.0 (Quality Information Framework, version 2.0) as an American National Standard. Subsequently in early 2016 QIF version 2.1 was approved. This paper describes how the QIF standard models the information necessary for quality workflow across the full metrology enterprise. After a brief description of the XML 'l...

multivariate process capability indices (mpci) show how well a manufacturing process can meet specifica-tion limits when quality characteristics enclose a relative correlation. process capability is an important and commonly used metric for assessing and improving the quality of a production process. when quality charac-teristics of a product are correlated then an attractive comes close to mpc...

This work presents the fabrication of 8X8 PDMS Fresnel microlens array (MLA) by maskless lithographic system. The FWHM intensity values of each spot present a deviation of 8%. Such a MLA can be applied as Shack-Hartmann wavefront sensor and to enhance the efficiency of detector arrays. OCIS codes: (080.2208) Fabrication, tolerancing; (080.4298) Nonimaging optics

Abstract Many tolerancing problems on mechanical assemblies involve a functional requirement depending chain of parallel dimensions individual parts. In these one-dimensional cases, simple methods are available for the analysis and allocation dimensional tolerances. However, they difficult to extend geometric tolerances, which must be translated into equivalent tolerances; this allows but makes...

multivariate control charts such as hotelling`s t^ 2 and x^ 2 are commonly used for monitoring several related quality characteristics. these control charts use correlation structure that exists between quality characteristics in an attempt to improve monitoring. the purpose of this article is to discuss some issues related to the g chart proposed by levinson et al. [9] for detecting shifts in ...

abstract. in the case of process capability index several methods are identified. in this paper ,a new process capability index using fuzzy number and fuzzy probability concept, in order to remove the weakness of other famous method is suggested. after introduction of fuzzy index in univariate case, fuzzy multivariate process capability index is investigated. finally, this new method is compare...

Geometrical defects of a manufactured feature are limited by form, size and location tolerances. The standardized semantics of those tolerances, i.e. their interpretation on the manufactured feature, presents a lot of drawbacks. We propose new semantics, based on the fitting of a unique theoretical feature on the manufactured feature. The fitting criterion we propose, named minimum volume crite...