The paper presents a method to store data in a workpiece directly during its manufacturing process. During turning a sort of bar code can be added to a workpiece by simply modifying its surface. The code can be written by using the same tool used for rough-turning or finishing, can be fully automatized and the new microtexture can be easily read along all the cylindrical surface. The written code involves a limited length and does not alter deeply the functional characteristic of the surface, while the wide lateral surface prevents the information to be lost as a consequence of dents and scratches.
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