The Influence Of Measurement Methods On 3D Digitizer Accuracy

Syed Mohd Yasir , Syed Jamaludin (2011) The Influence Of Measurement Methods On 3D Digitizer Accuracy. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Reverse engineering (RE) is a powerful tool for generating a CAD model especially in product analysis. It is also used to examine how a product works, what components it consists of, estimate costs, and identify potential patent infringement. The process of digitizing a part and creating a CAD model from 3D scan data is less time consuming and provides better accuracy than manually measuring the part and designing the part from scratch. Nevertheless, the accuracy of the 3D scanner is known to be lower compared to contact method. In this study, an investigation is done to analyze the effects of the scanning distances, angles and lighting conditions on 3D digitizer accuracy by using Taguchi method. Firstly, the test is to examine the effects on scanning distances by changing the position of scanning according to desire distance, secondly involved on the scanning angles where the test is undergone with three different angles and finally is based on the lighting conditions as the scanning is done under various brightness at the laboratory. Taguchi method is used in this experiment to determine the test run and also to analyze the accuracy of the 3D digitizer. Furthermore, from the result obtained one optimized parameter which will be used during T-test to find the significant difference between 3D digitizer and CMM together with an analysis of uncertainty model to suggest errors produce by both measuring equipment. As a result, it is found that 3D digitizer is less accuracy compared to CMM, clearly showed that non-contact method has less accuracy than contact method.

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