**2. Drilling of CFRP/CFRP stacks for aeronautical assembly**

In the aeronautical industry, in order to assemble two CFRP components, the latter are typically superimposed and then drilled together in a "one-shot" process so as to allow for easier subsequent riveting avoiding misalignment issues. Accordingly, to reproduce the real operating conditions of the aeronautical industry, wide experimental campaigns have been focused on drilling of CFRP/CFRP stacks made by two overlaid CFRP laminates [21–23].

In the following subsections, drilling of CFRP/CFRP stacks for aeronautical assembly is discussed with reference to experimental studies on the influence of drilling parameters, tool type and geometry on tool wear development, hole quality and surface integrity, and the opportunity to implement advanced sensor monitoring procedures for tool condition monitoring based on the acquisition and processing of thrust force and torque signals.
