In the gear world, bevel gear certainly occupies a special place. While for cylindrical gears the generation of teeth can be more easily understood, for bevel gears it is certainly more complex. The typical use of bevel gears are speed reducers with 90 ° output respect to the input axis. The method of generating the teeth changes according to whether you have straight bevel gears or spiral bevel gears. In the market there are various systems of multiple brands; we find, for example, technologies such as Pentac, Confilex, Hypoflex, Modul, Revacycle, each one linked to the machine tool manufacturer.