© INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.With the advent of new manufacturing philosophies based on zero mistakes and the need to produce high precision elements for the aeronautic industry, there is an increasing need of real time monitoring of high precission machining processes in order to assure that every component will successfully perform its duty without the need to perform any testing (destructive or non-destructive), which would imply an increased manufacturing time and the loss of valuable components. Nowadays, most processes are thoroughly studied to confirm its suitability by using dynamometers or surface acoustic emission sensors coupled with the known mathematical models for chip generation, but the apparition of robust microphones capable to function in harsh conditions and MEMS microphones with a wide frequency range open new possibilities of non-intrusive monitoring based on contactless sensors.