The core of the transformer is used to carry magnetic flux from primary winding to secondary winding. In this process some unwanted current (Eddy currents) are developed in the core, which is responsible for heat losses in the core.
To increase the efficiency of the transformer it is necessary that there should be maximum flux linkage from primary to the secondary and losses minimized. This is done by using CRGO Lamination for construction of the core.
Processing of Transformer lamination requires high degree of precision for which highly customized CNC machine are required.