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The development of a product includes varying engineering processes that include dimensional verification, especially in the stages of first article and test production. The product’s manufacture can cooperate with the system engineering concept and combine every engineering step in an integrated manner. Quantity verification plays the role of “checking” and ‘feedback” in a product’s system life cycle. However, Coordinate Measuring Machine (CMM) is essential to size measurement and its variety and accuracy also can help product’s development. CMM is also important in reverse engineering technology. We can use CMM to get geometry characteristics of the product and using reverse engineering software to make curves and reconstruct the planes to re-model its original shapes.
The experiment of this research can be divided into two parts, including size measurement and surface reconstruction. Use CMM to compare the dimensional variation of mouse and projector with its original design. Furthermore, apply the surface reconstruction function of CATIA to analysis the surface error of the projector. The result of this study shows, about 50%~60% of 3C products’ average dimensional variation is within 1%, but all of their variation is within the range of tolerance. On the other hand, the dimensional variation of mechanic sample is only less than 0.2%. It is possibly can conclude that higher dimensional variation of the electronic product is due to their more complicate shapes for the modern design and manufacturing processes.
This thesis is applying CMM to study the differences of ordinary electronic products’ dimensional variation and surface reconstruction between initial design and after re-modeling by using CAD software. This work is trying to find these product’s key design characteristics. This research is expecting to achieve verification and feedback function in system engineering methodology of products develop stages by using measurement and reverse engineering method.
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