Abstract: A drilling system is formed as a support structure to be mounted on a surface to be drilled, a beam supported by the support structure, a tool holder supported by the beam and having a locking orifice, and a drilling tool mounted on the tool holder by sliding connection in the direction parallel to the drilling axis. The drilling tool includes a bearing mandrel and an expandable ring closely fitting the bearing mandrel along a tapered contact surface for expanding the ring to ensure its locking in the locking orifice. Relative movement between the ring locked in the locking orifice and the bearing mandrel procures, by movement of the drilling tool relative to the tool holder via the slide connection, a movement of the bearing mandrel towards the surface to be drilled, through the locking orifice.

Abstract: The invention relates to a drilling system, in particular for two assemblies on which it is mounted. It makes it possible to drill holes through an overlap area, made using a drilling tool passing through a locking orifice formed on a tool holder of the drilling system, the drilling tool comprising a bearing mandrel as well as an expandable ring closely fitting the mandrel along a tapered contact surface and adapted so that a relative movement along a tapered contact surface. According to the invention, a relative movement is applied between the expandable ring and the mandrel so as to create, following locking of the ring in the locking orifice, a displacement of the mandrel bearing against the overlap area, through the locking orifice and towards said overlap area in order to exert pressure thereon, by displacement of said drilling tool relative to the tool holder via a sliding connection.