Carbon ber reinforced polymer (CFRP) is widely used in various elds due to its excellent properties.However, machining defects such as delamination and burr are still the key issues constraining highquality hole making on CFRP. This research takes the helical milling process to make holes on CFRP and two kinds of cutting conditions (dry cutting and jet cold air assisted cutting) are explored. Tool wear, cutting force, delamination and surface morphology are taken as the main indices to be analyzed. The in uences of key cutting parameters (spindle speed n, axial feed per tooth f za and pitch a p ) on cutting force and delamination are investigated and optimized. It turns out that the jet cold air condition is more suitable for helical milling of holes on CFRP with better qualities. The holes with smaller delamination factor and smoother surface are successfully fabricated based on the optimized cutting parameters.

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