Position tolerancing in reverse engineering: The fixed fastener case

Abstract

The present paper addresses the assignment of geometrical position tolerances in reverse engineering. Specification of manufacturing position tolerances for a reconstructed component of an existing mechanical assembly constitutes a complicated task that requires a well-grounded approach. Among features of size, cylindrical features such as holes in conjunction with pegs, pins, or screws are the most frequently used for critical functions, as are the alignment of mating surfaces or the fastening of mating parts. The relationship between mating features is classified either as a fixed or as a floating fastener type. The presented method focuses on the fixed fastener case. It is based on the systematic formulation of dimensional and geometrical relationships and constrains that allow for rational computer-aided processing and evaluation of the measured data from the reference parts, for which appropriately developed algorithmic tools are used. It is shown that the method is reliable, provides for realistic results, and is also time and cost competent as compared with the conventional trial-and-error methods. A case study demonstrates the concept and method.

A Systematic Approach for Geometrical and Dimensional Tolerancing in Reverse Engineering

“…In one of the earliest research works that systematically addresses the RE-tolerancing problem (Kaisarlis et al, 2000), presents the preliminary concept of a knowledge-based system that aims to the allocation of standard tolerances as per ISO-286. The issue of datum identification in RE geometric tolerancing is approached in a systematic way by (Kaisarlis et al, 2004) in a later publication. Recently, (Kaisarlis et al, , 2008 have further extend the research on this area by focusing on the RE assignment of position tolerances in the case of fixed and floating fasteners respectively.…”

Reverse Engineering - Recent Advances and Applications

“…In one of the earliest research works that systematically addresses the RE-tolerancing problem (Kaisarlis et al, 2000), presents the preliminary concept of a knowledge-based system that aims to the allocation of standard tolerances as per ISO-286. The issue of datum identification in RE geometric tolerancing is approached in a systematic way by (Kaisarlis et al, 2004) in a later publication. Recently, (Kaisarlis et al, 2007(Kaisarlis et al, , 2008 have further extend the research on this area by focusing on the RE assignment of position tolerances in the case of fixed and floating fasteners respectively.…”

“…The issue of datum identification in RE geometric tolerancing is approached in a systematic way by (Kaisarlis et al, 2004) in a later publication. Recently, (Kaisarlis et al, 2007(Kaisarlis et al, , 2008 have further extend the research on this area by focusing on the RE assignment of position tolerances in the case of fixed and floating fasteners respectively. The methodology that is presented in this Chapter further develops the approach that is proposed on these last two publications.…”

Characterizing the Effects of Learning When Reverse Engineering Multiple Samples of the Same Product

“…This involves determining an adequate product sample size to be reverse engineered based on a predetermined confidence level and acceptable error [15]. As the number of available parts for the sample size increases, so does the accuracy of the extracted data [16].…”