Portable computer measurement diagnosis system of machine tools in wood industry. In this paper the diagnosis system for the assessment of any machine tool in the wood industry, on the base of such mechanical measured quantities as rotational speed, a spindle or a tool relative vibrations, bearing housing absolute vibrations, static and dynamic axial or radial displacements, is described. The use of the computer programmes of the system is equipped with allows the user to conduct analyses in detail, which can improve the controlled cutting process.