method , applicable to two - dimensional wire bending machines for extension of their operation in bending to form three - dimensional wire frames , which is characterised by the application of a torsional moment along the axis of the wire and before the bending region , causing a permanent plastic deformation of the wire , by twisting it beyond the elastic region , with eventual result any bending action already occured in the regular plane of the two - dimensional bending macnine to be positioned a new plane , which form an angle with the regular plane equal to the remaining due to plastic deformation angle of twist .