The term 'Machine Piece' can be broken down into two crossword solutions: CAM (3 letters) and DIE (3 letters). A CAM is a rotating or sliding piece in a machine that is used to transfer motion from one part of the machine to another. It is typically made of metal and is usually shaped like a disc or cylinder. A DIE is a tool used to cut or shape metal or other materials. It is typically made of hardened steel and is used in a press to form parts with a specific shape.