During drilling process, when the drilling temperature exceeds the glass transition temperature (Tg) of the polymer matrix, the mechanical properties can be significantly degraded thus inducing thermal damage to the composite . The highest hole wall temperature was captured when the drill bit cutting edge fully emerged from the workpiece and a typical temperature field image is shown in Fig. (a). The maximum hole wall temperature (Tmax) is used for further analysis in this work. The regression function 𝑓𝑓 𝑇𝑇 of Tmax can be calculated following Eq. ( ) and the values of coefficients are shown in Table . The R-Squared (R 2 ) values are higher than 0.85, which is thought to be an indication of good regression performance . The prediction accuracy will be further verified through experiment validation in Section 5.