Abstract To increase industrial adoption, part qualification and certification of the additive manufacturing (AM) process are crucial through geometric benchmarking as well optimising properties parameters. However, an extensive research gap remains concerning dimensioning tolerancing (GD&T) AM parts. This paper presents a review on state-of-art GD&T powder bed fusion techniques enablin...

Aimed at overcoming the disadvantages of traditional selective assembly and improving the manufacturing processes of mating parts, a new approach of information-based manufacturing for the mating parts of selective assembly via a coordinated statistical tolerancing (ST) and SPC model is presented. On the basis of studies on quality indices and process capability index (PCI), particularly, the m...

This paper reports a complete system for modeling, representation, and validation of geometric tolerances, using feature-based approach from boundary representation (B-Rep) based solid models. The utility of feature based representation scheme for representing Geometric Dimensioning and Tolerancing (GDT) information in geometric models is highlighted. Explicit information from B-Rep is culled u...

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...

Sigma-delta modulation, where a single-bit quantiser is embedded within a negative feedback loop (Fig. 1), is now a commonly-used technique for implementing high-resolution analogue-to-digital and digital-toanalogue converters (DACs), principally because of a favourable insensitivity to component tolerancing [1]. Single-bit quantisation generates relatively high levels of quantisation noise, he...

A new, integrated approach to microwave design is presented involving concepts such as optimal design centering, optimal design tolerancing, optimal design tuning, parasitic effects, uncertainties in models and reference planes, and mismatched terminations. The approach is of the worst case type, and previously published design schemes fall out as particular cases of the ideas presented. The ma...

The idea, that we are willing to accept variation in an object but that we insist it should retain its original topological form, has powerful intuitive appeal, and the concept appears in many applied fields. Some of the most important of these are tolerancing and metrology, solid modeling, engineering design, finite element analysis, surface reconstruction, computer graphics, path planning in ...