Milling tool (100; 200) for machining fibre composites, having a clamping section and a cutting section which extend along a longitudinal axis (Z), wherein the cutting section is designed in a cylindrical basic shape, the outer circumference of which is divided by a plurality of intersecting first main chip grooves (LS), which are designed as left-hand spirals, and second main chip grooves (RS), which are designed as right-hand spirals, into a multiplicity of cutting units which each have a first circumferential cutter (LR) running along a left-hand spiral and a second circumferential cutter (RR) running along a right-hand spiral, wherein the first circumferential cutters (LR) and the second circumferential cutters (RR) are each formed along a common enveloping cylindrical casing surface which determines the outer circumference of the cutting section , the first circumferential cutters (LR) are each adjoined in the circumferential direction by first flank surfaces running at a first clearance angle (γ) and the second circumferential cutters (RR) are each adjoined in the circumferential direction by second flank surfaces running at a second clearance angle , wherein a plurality of auxiliary chip grooves (HS) are formed on the cutting section , said auxiliary chip grooves extending spirally and being recessed in the radial direction in relation to the first and second flank surfaces (5; 6) and dividing the individual cutting units into a first region (B1) on which the respective first circumferential cutter (LR) with the first flank surface is formed, and into a second region (B2) on which the respective second circumferential cutter (RR) with the second flank surface is formed, characterized in that the auxiliary chip grooves (HS) extend along left-hand spirals which run parallel to the first main chip grooves (LS), or the auxiliary chip grooves (HS) extend along right-hand spirals which run parallel to the second main chip grooves (RS). wherein the cutting section is designed in a cylindrical basic shape, the outer circumference of which is divided by a plurality of intersecting first main chip grooves (LS), which are designed as left-hand spirals, and second main chip grooves (RS), which are designed as right-hand spirals, into a multiplicity of cutting units which each have a first circumferential cutter (LR) running along a left-hand spiral and a second circumferential cutter (RR) running along a right-hand spiral, wherein the first circumferential cutters (LR) and the second circumferential cutters (RR) are each formed along a common enveloping cylindrical casing surface which determines the outer circumference of the cutting section , the first circumferential cutters (LR) are each adjoined in the circumferential direction by first flank surfaces running at a first clearance angle (γ) and the second circumferential cutters (RR) are each adjoined in the circumferential direction by second flank surfaces running at a second clearance angle , wherein a plurality of auxiliary chip grooves (HS) are formed on the cutting section , said auxiliary chip grooves extending spirally and being recessed in the radial direction in relation to the first and second flank surfaces (5; 6) and dividing the individual cutting units into a first region (B1) on which the respective first circumferential cutter (LR) with the first flank surface is formed, and into a second region (B2) on which the respective second circumferential cutter (RR) with the second flank surface is formed, characterized in that the auxiliary chip grooves (HS) extend along left-hand spirals which run parallel to the first main chip grooves (LS), or the auxiliary chip grooves (HS) extend along right-hand spirals which run parallel to the second main chip grooves (RS). <EOS>