Definitions for "Workpiece"
work consisting of a piece of metal being machined
That piece of metal or object that is intended to be subjected to, or is being subjected to, any of the metal forming processes such as casting, forging, stamping and machining.
Keywords:  substrate, bend, drill, wish, tool
Workpiece (also called workpiece material) is the substrate you wish to cut, drill, bend, attach, finish, etc., With a tool.