The reverse engineering technologies facilitate development of new or redesign of existing products, which has been presented in this paper on an example of dental impression trays redesign. There are different types of trays available today, in order to ensure proper retention, stability and support in the impression taking procedure. Disposable lower and upper trays have been used as the initial samples for 3D scanning, which was performed by the GOM Atos Compact Scan 8M optical scanner. The CAD models were build using Geomagic and SolidWorks, while the redesign consisted of introducing new perforations in order to allow the impression material to expand through the holes and so be held securely in place. Finite element analysis has been used to investigate the effect of introducing these design changes to structural rigidity. Due to the need to consult a prosthetist about the acceptability of the redesign, the models have been printed by the 3D printer Zortrax M200 Plus.

To perform a stress analysis of a crankshaft over the entire cycle of an IC engine, one has to possess a loading history, i.e. the magnitude of the load should be available for every position of the crankshaft during the cycle. This loading history has been obtained through a dynamic analysis done in MATLAB and used in the finite element based stress analysis performed in SolidWorks Simulation 2019. After finding the optimal mesh using the manual h-convergence method, the FE analysis yielded the results neccessary for the fatigue life predictions at previously chosen critical locations. Fatigue performance of the crankshaft was evaluated both analytically and numerically.

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