The final work consists of a theoretical part, the technological process of magnetic core stacking (stator package) and technology of stator segment sheet production. The theoretical part summarizes the working principle of synchronous hydro generator and describing its most important parts. With all the essential parts of a synchronous generator, such as stator, rotor and excitation, briefly is described and the stator packaging process (magnetic core) which makes very important part of the active part of the machine. The theoretical part describes other parts of that are used in production of magnetic core and magnetic properties of materials for production of the stator segment sheet as the most important component of a laminated core. Description of the technological processes of stator core production we present technological process as part of the manufacturing process that involves all the activities that takes place in the preparation of parts, assemblies and subassemblies which are installed in the final product. In the final part of the paper, complete technology of stator segment sheet is presented as part of the production process which includes all activities on the workpiece material from entering the process until his release in the form of a finished product ready for installation. On the samples that are taken from the production all the necessary incoming and intermediate tests are carried out showing the measured results. Sample preparation and all intermediate tests are carryed according to internal control testing regulations and ISO standards at the factory Koncar GIM in Zagreb, while the dimensional control stamped sheet sample was conducted at the factory King Metal Tools Ltd. from Zagreb.