Feito et al. conducted a full factorial experiment to minimize the thrust force, torque, and delamination damage at hole entry and exit. They addressed the multi-objective optimization by translating it into a scalar fitness function, with each objective assigned specific weighting factors. Their findings revealed that a low feed rate of 0.05 mm/rev was consistently optimal across all conditions, whereas the optimal cutting speed was highly sensitive to the chosen weighting factors. In a later study, Feito et al. applied the same method to optimize drilling thrust force and delamination, observing that the optimal cutting speed rose significantly from 25 m/min to 100 m/min with different weighting factors. The scalarization method has also been deployed in other CFRP machining optimization studies .