Gauges are used to measure the material thickness of a sheet of metal. ... Take for instance 12-gauge thickness across the material types listed below; stainless steel is 0.105″ thick, aluminum is 0.080″, copper is 0.108″, and brass is 0.081″.
The first thing you need to know about aluminum is the different grades that are available. Aluminum comes in three basic types: 1100, 3003, and 6061. The grade of the aluminum will determine the end-use application and price point. It has relatively high requirements for thickness. If the thickness is too thin, it is easy to deform. Therefore, it is recommended that you use aluminum with a thickness of more than 2.0 mm such as 3 mm aluminium plate. Large-area carving will reduce the deformation resistance and rigidity of the aluminum plate.