Cylindrical gears, spur and helical, are widely used to transmit power between two objects. They are very precise mechanical components and the design behind them is very complex. When dealing with gears, in general, the attention is focused on a smooth and silent transmission, to ensure that all the parts work nicely. However, gears may break, as they are subject to different types of wear. In the best case, technical drawings of the part are available and spare parts can be obtained. Often, unfortunately, drawings of parts are not available and the people in charge of repairing and/or reproducing a part need special tools and algorithms to enable them to do their job.