Internal broaching allows the creation of teeth starting from pre-existing holes. The broach tool has more series of teeth with increasing protrusion, in order to progressively remove the material of the inner surface of the hole to achieve the desired toothing. It is possible to realize toothing according to all existing standards or with any special profile. The job can be done thanks to the movement of the broach tool (by traction or compression) or with the movement of the table on which the piece to be broached rests.