Connecting the Assist Gas
Connect the appropriate assist gas to the machine. The laser system requires nitrogen (N2) or compressed air to cut stainless steel, aluminum, copper and brass, and requires oxygen (O2) to cut mild steel.
If compressed air is used as the assist gas, make sure it is WATER FREE AND OIL FREE. Otherwise, the protective lens in the laser head will get dirty and wet, and will be broken by the laser while cutting.