3d scaning services

3D SCANNING AND REVERSE ENGINEERING

3D Scanning process

The Handyscan3D technology opens a complete new dimension to 3D scanning of physical objects. Its portability, its easy and uncomplicated handling, its affordability gives the user, regardless of which industry, the possibility to obtain an accurate tridimensional model of the component. This computer model can be used for applications like reverse engineering, model to CAD comparison, quality inspection, 3D archiving of valuable objects and many others.

 

The scanning process consists of the following steps:

 

Object preparation: As the scanning is done with a laser beam projected to the surface of the part and its reflection picked-up by the two stereoscopic digital cameras, the colour, texture and finish of the object’s surface has an important influence on the quality of the scan. In some cases, in particular when the object has a highly reflective, transparent or semi-transparent surface, the part to be scanned has to be prepared in order to minimise unwanted reflections or refractions. In these cases the surface should be covered with a thin and uniform layer of talcum (white). When possible, spray-painting the surface with a mat coating, preferably white, will also improve the quality of the scan. As the Handyscan3D is a self-referencing laser scanner, the attachment of the target points on the object’s surface is necessary.

 

Equipment preparation: Important before starting to scan is to calibrate the scanner, particularly after transport. In the case of the Handyscan3D it is done by following the calibration procedure in the VXelements software. Additionally the equipment has to be set-up to the surface colour of the object, which is done automatically in VXelements.

 

Scanning: The scanning process with the Handyscan3D hand-held scanners is easy and efficient as VXelements shows with its real-time rendering which surface sections have already been scanned and where additional scanning is necessary. Also the self-referencing of the scanner to the object makes the process quite relaxing as the scanner is only connected to the computer with a fire-wire cable, giving the user easy access to all the areas difficult to reach. As the VXelements software generates its own coordinate system no alignment procedure is necessary.

 

Post-processing: The STL file generated automatically by the VXelements software can now be processed to the required quality and specification. Reverse engineering projects require that the meshed surface is converted into a water-tight CAD model. In some instances a parametric CAD model is required incorporating into the surfacing process the design intent of the original part. For quality inspection tasks the scanned object is aligned with the model of the object that it is compared with. The generation of inspection reports is also part of this step. Colour deviation maps give a one-glance report showing the areas with the largest deviations.