I use a CNC Plasma cutter to cut the metal for my sculptures. The Plasma cutter is a Hypertherm 65. The CNC table is by ShopSabre made in Elko Minnesota. It can cut a 4' x 8' sheet of steel up to about 1/2" thick.
The designs are drawn in a computer and transferred to the ShopSabre which will follow the lines while cutting the steel.