The carbon fiber reinforced plastics are highly promising materials which widely used in aerospace industry due to their excellent mechanical properties. The delamination is considered a major problem in manufacture the parts and assembly. The thrust force affected the delamination mostly. This paper investigated the drilling force, torque, delamination of carbon fibred composite with carbide drilling tools and half core drilling tool. The experiments were carried out under air cooling cutting conditions and the drilling force and the damage around the hole using carbide tool and half core tool were compared. The experimental results indicated that the drilling forces using half core drill were smaller than that of using carbide tool and the damages around the drilling hole using half core tool and better than that using carbide drill.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.