# Reverse Engineering Used to Profile a Gerotor Pump Rotor
## 5 Conclusions  
Multirotor pumps with gerotor technology, apart from the advantages of increasing the flow rate and balancing the radial forces, represent a balanced compromise in terms of simplicity, robustness, compactness, versatility, and noise due to the simpler structure and reduced number of components compared to other external or internal transmission pumps, which play an essential role in increasing volume yield. The use of technologies based on advanced optical sensors and sophisticated algorithms to perform high-resolution and accurate scans can lead to the rapid and accurate acquisition of three-dimensional data, the filtering of this data, as well as its export in various formats usable in design and analysis applications, contributing to obtaining accurate and complete results in the digitalization process. Another important aspect of using reverse engineering 3D measurement techniques is the creation of custom reports that include tables of measurement results, images of inspected parts, and relevant diagrams. These reports provide essential information about part quality and compliance and can be used in quality control, product development, and manufacturing processes. Thus, the paper demonstrates that the use of reverse engineering techniques not only substantially reduces the time to translate physical objects into formats that can be easily edited by other software but can also generate numerical models with remarkable accuracy compared to CAD models. * The use of three-dimensional scanning allows complex numerical models to be obtained on which geometric measurements and features can be determined, allowing an accurate and complete CAD model to be produced. By comparison, obtaining the numerical model using a coordinate measuring machine would require a higher workload and a more skilled operator. In this case, it was estimated that the time savings achieved using the ATOS measuring system compared to using a coordinate measuring machine were about 50%, since both features have relatively simple geometry. The advantage of scanning techniques increases even more with increasing part complexity and is recommended for one-off or small-series products. * By overlapping the scanned models over the CAD models, it was observed that the upper limit value of the represented deviations is 0.5 mm and the lower limit value is \(-\)0.5 mm, demonstrating the accuracy of the models. * The use of the \"virtual pole\" method, the original method, the foundations of which were laid by members of the authors' team, facilitated the redesign of the existing models, leading to a substantial improvement by decreasing the distances d between the inner and outer rotors, which are in the enclosure, leading to better tightness between the moving components, as well as by increasing the theoretical area S in which fluid accumulates in various angular positions in the rotational motion. Thus, for the distances d a difference between 4.2% (at an angle \(\varphi_{2}=30^{\circ}\)) and 57.8% (at an angle \(\varphi_{2}=120^{\circ}\)) is observed on the left side, and 17.9% (at an angle \(\varphi_{2}=180^{\circ}\)) and 54.4% (at an angle \(\varphi_{2}=30^{\circ}\)) on the right side. In the case of the \(S\) area, overall, there is an increase of about 16% for the redesigned, improved model. The present study opens perspectives in the design of profiling algorithms based on which high-level programming language applications can be realized, for example, Visual Basic for Applications realized in the CATIA software program, which allow the profiling of various cutting tools to contribute to the optimization of the design and manufacture of parts from the structure of volumetric pumps and not only. Likewise, the virtual pole method has been successfully applied to the profiling of other types of cutting tools (rotary cutter designed to process ball screws, gear-shaped cutter for generating profiled holes, rack tool for generating a piece of type shaft with a square section, etc.