Remember the other day I was talking about CNC type machine work. It is basically a type of computer controlled for machines. Any machine that a human can operate can also be operated by a computer. Remember your practice using the plasma cutter.. Check this CNC plasma cutting machine for example:
How about something a little more complex? The CNC 5 axis machining center can make things from scratch and even modify existing engine components. Some start with a solid chunk of material, and some start with an existing component.
Everything must start with design: Check out this site that shows the type of work that can be done with a CNC. Check out these examples
Programming the design in an accurate CAD drawing (computer aided design):