Table shows the ANOVA results of Fda. For CF/PEKK, the second and first order terms of feed rate are the top two influencing factors, with a contribution of 48.79% and 30.72%, respectively. The second order term of spindle speed also has a contribution of 5.02%. This is distinctly different from the results for CF/epoxy, where feed rate is the only significant influencing factor on Fda (contribution 90.29%). Our ANOVA results for CF/epoxy are closely in line with the literature , i.e., the feed rate contribution towards Fda is greater than 80% and is far higher than the contribution of the spindle speed. Interestingly, drilling of CF/PEKK has led to a drastically different delamination damage variation trend with drilling parameters as compared to CF/epoxy.