Abstract: A method of measurement random wave and vibration processes in mechanical system with distributed parameters is disclosed. The methodical problem solution of recognition the condition of a cutting tool (identification micro- and macro-destructions) in cutting process is given. As an example is described the real time measuring and control expert system realising given algorithms of detecting the condition of a cutting tool during cutting process. As a means of measurements the measuring transducer is offered, in which one as the sensor the accelerometer can be used.