Steel plate machining involves any process in which a piece of raw steel plate is cut into a desired shape and size via a controller material-removal procedure. All processes that follow this action are collectively referred to as subtractive manufacturing. Machining is a vital part of the manufacturing process of many metal products, especially steel plate. However, it can also be used on other materials such as wood, plastic, composites and ceramic.

Most modern day machining practises are performed by computer numerical control (CNC). This is a process when computers are employed to control the position and functionality of the mills, lathes, grinders and other cutting machines. There are many benefits to using CNC machining, including:
• Increased precision over manual machining;
• Faster production rates;
• Workpieces can be perfectly replicated over and over again;
• Ability to create complex shapes otherwise unachievable with manual machining;

As evidenced by this list of advantages, CNC machining is used to complete complex projects that require a higher level of precision or very repetitive tasks.