This project aims to develop a new device of measurement and follow-up of the temperature in tools at the time of machining in severe conditions strong added value material. It will be a particular question of carrying out a transfer technology between the university laboratories implied in this project and ACTARUS [Part. 2] company concerned with this sphere of activity. This transfer will directly be applied on composite parts machining with the SLCA [Part. 3] company. The mechanical behavior of materials with respect to the requests to which they are subjected at the time of their use depends mainly on the choices adopted at the time of their implementation. Technological solutions exist to minimize the thermomechanical constraints at the time of matter removal and thus to preserve the integrity of machined material. Indeed, the processes of machining very high speed (UTGV), the coatings of tool and it micro lubrication are as many solutions which make it possible to minimize the heat sources terms relating to the tribological phenomena the level of the interfaces tool - matter. Nevertheless, each one of these solutions must be adapted to the configuration of machining met (couple tool - matter) and, on the other hand, difficult to implement in the framework of composite material machining. The numeric digital codes of thermomechanical simulation of the cut developed since ten years are very powerful but cannot be used in the objective to follow and control machining in real time. Company ACTARUS is specialized in the development and the marketing of technologies, products and services associated for control with machining in real time, which implements the patented system of measurement uninterrupted of the temperature of cut in machining. It developed tools equipped with thermal sensors which make it possible to follow the change of the temperature in points very close to the zone of cut. This single device was established on various factories site (CEA, MECACHROME, PSA, PCI, MONTUPET...). To have a more precise knowledge of the energy balance of the cut, the TREFLE [Part. 1] and the IMS [Part. 5] have developed for a few years a new methodology which consists in estimating the heat flux applied to the tool by inverse method. This approach requires on the one hand the temperature measurement in one or more points in the tool and on the other hand the development of a model binding the heat flux to the temperature in the tool. The complexity of the tools used nowadays in the industrial sector (presence of a coating, geometrical configuration of the tool...) led us to establish this model by system identification. Our project first of all consists in applying the methodology developed by the TREFLE and the IMS to the devices of follow-up and control in machining marketed by company ACTARUS. Direct applications are then envisaged within the SLCA company concerning the machining of composite materials in severe conditions. A second aspect of our project is to carry out a characterization bench of the tool where the rise in temperature reached at a peak of tool will be of the same order of magnitude as that met during machining (a few hundreds of degrees). For the achievement of this second objective, the LNE [Part. 4] will place at the disposal its competences in the field of the metrology of the lasers of power.