Int J Technol Des Educ https://doi.org/10.1007/s10798-018-9458-z On the effects of the fix geometric constraint in 2D profiles on the reusability of parametric 3D CAD models 1 2 3 Carmen González‑Lluch · Pedro Company · Manuel Contero · 3 4 David Pérez‑López · Jorge D. Camba Accepted: 2 June 2018 © Springer Nature B.V. 2018 Abstract In order to be reusable, history-based feature-based parametric CAD models must reliably allow for modifications while maintaining their original design intent. In this paper, we demonstrate that relations that fix the location of geometric entities relative to the reference system produce inflexible profiles that reduce model reusability. We pre - sent the results of an experiment where novice students and expert CAD users performed a series of modifications in different versions of the same 2D profile, each defined with an increasingly higher number of fix geometric constraints. Results show that the amount of fix constraints in a 2D profile correlates with the time required to complete reusability tasks, i.e., the higher the number of fix constraints in a 2D profile, the less flexible and adaptable the profile becomes to changes. In addition, a pilot software tool to automatically track this type of constraints was developed and tested. Results suggest that the detection of fix constraint overuse may
International Journal of Technology and Design Education – Springer Journals
Published: Jun 6, 2018
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