How to define high-speed milling (HSM)? That’s not so easy, though one statement is that the cutting speed is so high that this causes the forces for cutting the workpiece material to decrease. However, there is no doubt that the Mikron series machines from the GF AgieCharmilles Group are real “HSMs”. Really innovative is that they are provided with ITM, a system for exactly defining the vertical position of the highspeed cutting tool edge. Besides that, the designers took a lot of measures to realise stable machines with very accurate high-speed spindles.