# Methodology for Verification of Geometrically Complex Components Through Reverse Engineering
## 2 Materials and Methods
### Verification of the Welding Fixture Using the Kreon ACE-7-30 Scanner in PolyWorks Inspector  
Before the welding fixture was introduced into serial production, a comprehensive verification process was conducted to ensure its accuracy and functionality. This step was essential to confirm that the fixture correctly positions individual components during manufacturing and meets the precision and tolerance requirements specified in the technical drawings. The primary objective was to identify any deviations that could affect manufacturing quality, particularly concerning locking mechanisms, clamps, and other key fixture components. To achieve this, reverse engineering techniques were employed, allowing for a detailed geometric analysis of the fixture. In this case, reverse engineering was used to verify whether the shape and dimensions of the fixture corresponded to the original CAD models. This process involved 3D scanning, which provided a digital representation of the fixture's actual state. Subsequent analysis helped identify potential inaccuracies in the fixture's construction, which could cause issues in serial production. This approach effectively mitigated risks such as incorrect part positioning or misalignment, which could lead to increased production costs, reduced product quality, or even fixture failure in operation. During the scanning process, environmental factors that could affect measurement accuracy were considered. The lighting was stabilized to minimize its impact on scanning accuracy, as different lighting conditions can influence the quality of the captured data. Additionally, the surface properties of the object were considered during measurement. Surfaces with high gloss or reflectivity can cause inaccuracies, so specific scanner settings were applied to compensate for these factors and improve the scanning quality. The use of a calibrated scanner also played a crucial role. To ensure the reliability and repeatability of the scanning process, the measurement was conducted in the same environment, where external influences such as temperature changes and vibrations were minimized. A stable table was used for the measurement, ensuring stability and eliminating any external movements that could affect accuracy. The repeatability of the measurement was verified by performing multiple scans of the same object, and the results were compared with reference values. The entire verification process of the welding fixture was carried out using PolyWorks Inspector software, version 2022 (Figure 9), which is equipped with advanced tools for 3D scanning and geometric deviation analysis. This software is ideal for detecting inaccuracies and comparing the actual condition of the fixture with the specifications outlined in the technical documentation. Figure 9 illustrates the selection of all analyzed parts of the fixture, with clearly marked areas where deviations or critical geometric features were identified. The analysis results are visualized using tolerance color maps, allowing for a quick interpretation of the differences between the actual and nominal models. Green represents values within the nominal dimensions, meaning no significant deviations. Yellow and red indicate positive values, where the actual dimension exceeds the nominal value. Blue and purple signal negative values, where the actual dimension is smaller than the nominal value. Detailed step-by-step description of the verification process of the welding fixture using the Kreon ACE-7-30 Scanner in PolyWorks Inspector:  
1. Preliminary inspection--before starting the verification process, a thorough inspection of the physical condition of the welding fixture was conducted. All fastenings, locks, and screws securing the correct positioning of the parts were checked to prevent any unwanted movement during scanning. 2. Scanner setup and calibration--the Kreon ACE-7-30 scanner was configured and calibrated to achieve the required scanning accuracy.