In this work, it is a question of the cutting tool wear monitoring in mechanical turning. We did this monitoring in three phases which correspond to the life of our tool. To achieve this objective of improving monitoring, we have used a processing method (EMD) that breaks down a large signal into small signals (IMFs). The cut up or processed signals are yet applied in the temporal (RMS) and frequency (Spectrum) indicators in order to monitor the evolution of the tool in relation to its degradation and to check the reliability of the indicators. The obtained results will be optimized in an on-line monitoring system and incorporated into a microcontroller dealing with its three phases, in order to make the comparison of informations each time they are generated by the machine.
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