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| In many industrial applications, 3D model has to be either created from the real product or converted from 2D draft manually if not being left to be vacant, such as reverse engineering, oriental design, prototyping, and benchmarking competitor¡¯s product. |
The typical work flow of reverse engineering starts with obtaining the 3D polygon data of the entire object with scanner, then create surfaces according to the 3D data with RE software, and finally design the new product.
Therefore, 3D data acquisition is the basic of the following jobs, it determines the quality and speed of the whole procedure. For example, if the performance of the 3D scanner is poor, not only the precision of the generated surfaces will be poor, but the speed of generating process will be much slower also.
Furthermore, if the scanner is not able to scan some areas of the object, such as narrow deep holes, sharp edges, or complicated patterns, it will also be improbable for the RE software to generate precise surfaces at the end.
For coming over those difficulties, Rexcan III was designed an additional 10 degree triangulation angle scanning mode for narrow deep holes on objects. Moreover, with its high resolution cameras, scanning process has become much easier and faster than ever before, narrow deep holes, sharp edges, and complicated geometrical patterns are no longer difficult to scan or measure. |
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Scan the front side of the object, and get a group of scan patches. |
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Scan the rear side of the object, and get another group of scan patches. |
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Align each group with in-group registering function in Ezscan. |
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Align the 2 groups together into a single coordinate system with ezScan. |
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Generate single triangular mesh with ¡®Batch processing¡¦¡¯ |
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function, which includes fine alignment, merging, and data decimation, in ezScan. |
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Export to triangular mesh into .STL data format for reverse engineering. |
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As shown in the above figures, the measurement data obtained with the Rexcan III is very clean, and edges are very sharp and clear, which ensures very precise CAD data with much fewer efforts. |
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Load the 3D triangular mesh in .STL format to reverse engineering software. |
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Adjust the reference axis by defining the surface and its axis. |
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Select an important part of the turbine such as one wing and create the surface. |
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Extract the outline and cut off the surface with it. |
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Make an opposite surface of wing and its axis in the same way. |
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Extract ¡°fillet¡± value with the ¡®curve¡¯ in the scan data for ¡°Fillet¡± part. |
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Rotate reference axes created in step 1 for 120 degrees, copy them, and put them together for generating a single 3D model. |
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| This process can help industry applications which only have real object but no available 3D data 3D data obtained in this process can also be used for CAM purpose and analyzing parts¡¯ performances.
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