We are equipped with the most modern 3D scanning systems thanks to which we can detect and digitize objects of any shape or size. 3D scanning allows obtaining a polygonal model with a precision of 0.03mm, using ﬁ xed or 0.05mm machines using anthropomorphic systems with blue light laser detection, allowing to cover areas ranging from a few square centimeters to automotive class developments and aeronautics (up to 60 meters).
Thanks to scanning it is possible, starting from a physical sample, to obtain a virtual model composed of a cloud of points of considerable accuracy that can be converted into tessellated models for triangles by successive processing.
the term reverse engineering means the reconstruction of an analytical CAD model using the scan polygonal model as reference.
There are numerous 3D scanning services which, starting from the point cloud, leave the computer with the onerous task of obtaining one or more skins that describe the 3D of the particular. This type of reverse is recognizable by the aesthetics in the form of a mesh, it is usually a very heavy .IGS or .STP file in which the single entities (planes, holes, beams, etc.) are not identi ﬁ able since the entire object is described by a full shirt. This solution that takes the name of Auto-patch has the handicap of not being modifiable in the result that in case of deformed or damaged objects it will reproduce a 3D with the same damages.
The peculiarity of our reverse consists in recreating the whole set of CAD features with a parametric 3D modeler, generating solid models in STP format that are very light and highly functional. With this procedure it is possible to recreate 3D models by reconstructing exactly any symmetries, remodel even deformed, damaged areas or small missing parts, obtaining a 3D file
similar to the one of the first design or even developing changes and design improvements. To achieve this, our operator with many years of experience in the field of mechanical and functional design goes to shape every single aspect. the overlap between the refined scan data and the operator’s competence in examining the speci ﬁ c detail allow to identify critical aspects
such as, symmetry, average thickness, minimum thickness, material strength, mechanical overstressing etc. allowing the correction of all these undesirable aspects, maximizing the functionality of 3D, allowing for example the construction of new replicas no longer as spoiled as the sample.
The term dimensional control refers to the 3D scan file format with the 3D design geometry. In simple terms it allows to obtain a direct comparison between a physical object (subjected to a previous scan) and the corresponding starting CAD model. This is of particular importance for the quality control areas where it is essential to identify and quantify the possible di enze erences between the 3D theoretical project and the objects resulting from production cycles that
already by their nature introduce errors.
To evaluate the geometric feasibility of a 3D scan on a particular without having to resort to the aid of casts or to dissect the object, it must be visible simultaneously from two points to 60 ° between them. A first analysis can be carried out with a square, if this fails to enter the cavities or in the recesses of the object this indicates that the simple scan does not guarantee complete
reconstruction. In this case it will be necessary to dissect the object. If it is not possible to act with sections, which clearly have a destructive character, you can use silicone molds of the hidden areas that will later be scanned separately and assembled on the object’s file.
Examples of Reconstructions
mechanical details of vintage cars or restorations
By integrating together the most sophisticated measuring machines and the best skills in 3D modeling and CAD design, we can revive the most complicated mechanical objects (for example engine blocks, engine heads, gearboxes and transmission units, turbines and turbo compressors, etc.) of historic or high-value vehicles, providing 3D ﬁ les that through rapid prototyping or CNC machining aim to recreate functional
components starting from damaged objects or duplicate parts as spare parts.