Method and apparatus for investigation and identification of the nature of the underlying surface

摘要

The method involves detecting a shock wave generated or induced in a penetrating machine tool (2) at the start of or before a working process. Deriving at least one parameter characteristic of the material from the shock wave signal and evaluating the parameter to determine the classification of the material. At least one externally acting force is taken into account in classifying the material. An Independent claims is also included for an arrangement for investigating and identifying the type of material.