The results suggest that the maximum allowable feed rate of CF/PEKK is 183% higher than that of CF/epoxy, see Fig. (a). This correlates to three times greater machining efficiency (in terms of MRR) as compared to CF/epoxy, see Fig. (e). Although the corresponding maximum thrust force is higher, the resulting Fda for CF/PEKK is still within the allowable range, indicating the holes are of satifscatory quality, see Fig. ). The range of thrust force, MRR and Fda covered by the Pareto solutions for CF/epoxy in this study is similar to results reported by Wang et al. . However, due to additional design variable (i.e. tool point angle) envolved therein, their data features multi-curve plots rather than a single curve feature. By revealing the Pareto front of CF/PEKK drilling and comparing with that of thermoset CF/epoxy, we highlight how different materials properties and their drilliing performance can influence the ranges of objectives. This further emphasize the importance of considering material properties when conducting future optmization work in relation to composite manufacturing, as the optimization outcome can be highly material property dependent and case sensitive.