Register with the Italian Order of Engineers (Consiglio Nazionale degli Ingegneri) or similar bodies. Members often have access to legacy standards through technical libraries.
The UNI 3220 Standard
The standard is a foundational technical document in mechanical engineering, specifically governing the dimensions and design of centering holes . These holes are critical for accurately locating a workpiece between centers on machine tools like lathes or grinding machines. Understanding UNI 3220 uni 3220 standard pdf