Purpose This paper aims to investigate the quality of printed surfaces and manufacturing tolerances by comparing cylindrical cavities machined in parts obtained fused deposition modeling (FDM) with holes manufactured during printing process itself. The comparison focuses on results roughness tolerances, intending obtain practical references when making assemblies. Design/methodology/approach ex...

Most commercial computer aided design (CAD) is not really design software but instead either supports two dimensional drafting or three dimensional geometric modeling, with added text representing dimensions, tolerances, process notes, and so on. The most advanced commercial CAD software permits geometry to be parameterized by numerical or symbolic arguments, with some equality and inequality c...

shrink fit process is a useful technique in order to introduce beneficial residual stress in compound pressure vessels. in this paper, the effects of geometrical tolerances on residual stresses have been studied for a compound shrink fitted pressure vessel, practically. three layers, which are designed based on an optimum nominal thickness and overlap dimensions and tolerances, have been fitted...

An image is never noise free. Visual inspection of a part from its image is therefore affected by image errors. Understanding how image errors affect measurement precision is therefore critical for accurate inspection. In this paper, we lay out a statistical framework that allows to explicitly handle image errors and characterize their impact on measurement precision. A hierarchical model is al...

The focus of this publication is a review of the state of the art in tolerance analysis, synthesis and transfer for geometric and dimensional tolerances (GDT) in sheet metal forming and the integration solutions with computer-aided process planning systems. In this context, the general tolerance methods are first described. Then the mathematical models for sheet metal tolerance analysis and syn...

The Geometrical Product Specification (GPS) is a set of standards widely adopted by modern manufacturing industries for expressing tolerances and communicating geometrical requirements. It has great benefit in reduction of manufacturing cost, alleviation of design and manufacturing misunderstandings and insurance of the consistency of geometric characteristics for the machining products through...

Rigorous and precise formulation of tolerancing and dimensioning plays an important role in tolerance evaluation using CMMs. In this paper, we rst present a uniied geometric formulation of form tolerances using an extended least-squares E-LSQ approach. Then, using properties of connguration space of symmetric features an iterative algorithm is developed to solve the E-LSQ problem. Simulation re...

Active triangulation measurement systems with a rigid geometric configuration are inappropriate for scanning large objects with low measuring tolerances. The reason is that the ratio between the depth recovery error and the lateral extension is a constant that depends on the geometric setup. As a consequence, measuring large areas with low depth recovery error requires the use of multiresolutio...