A method for producing a fastening point and tool for producing a cavity in the plate-shaped material is

A method for producing a fastening point in the plate-shaped materials, with a core layer that has a lower density than the cover layers, such that after forming an access hole through the top cover layer and the core layer an axially displaceable tool having a cutting edge (15) into the access hole that the cutting edge (15) swings out radially and that the tool rotates, wherein a cavity having a hemispherical cross-section by undercutting of the core layer is formed up to the underside of the upper covering layer and the diameter of the undercut produced is many times larger is used as the diameter of the access bore and that the cavity is filled with a flowable and hardenable filling compound.