This work presents a method implemented in an embedded system to detect the first contact between a high-speed machine tool and a workpiece surface with high accuracy, retiabitity and ease-ofuse. This method is based on impedance magnitude variation measurements and the computation of a correlation function. A specific sensor was designed from this method for testing purposes in actual industrial conditions. This work is focused on the detection of the first contact between the toot and the workpiece surface. The purpose of this paper is to exptore the efficiency of impedance spectroscopy and to identify a method to detect the first contact between a toot and a workpiece efficiently in highspeed machining operations and for the finishing process in particular.

This paper presents a new method implemented in an embedded system to detect the first contact between the rotating tool and the surface of the workpiece in the high speed machining operations with a high degree of accuracy. This method is based on the measurement of impedance variations and the calculation of a correlation function. This embedded system associated with the machining process ensures not only the geometrical quality of machined surfaces but also to avoid measuring the tool with tool touch probe, which allows to compensate the tool wear. The purpose of this project is to hold together the world of embedded and the machine world and make an industrial demonstrator integrating different features developed.Index Terms-embedded system (ES),impedances variations, machining process, industrial demonstrator.