A process and a system are described for working a workpiece through numerically controlled machine tools. The process comprises the steps of: reading an electronic representation of an object to be worked and storing it; possibly computing an internal mathematical model of the object based on data obtained from the reading step; providing a plurality of movement parameters of a tool for working the object, these parameters including directions, space limits and movement typologies; and real-time moving a working tool based on the electronic representation being read or the computed model and on the provided parameters.