A machine is composed of mechanical and electronic parts. A robot is a machine composed of mechanical and electronic parts to mimic some function humans are capable of. Mechanical man is a theory. It can not exist without biological components. It works tirelessly out of appreciation for the life it has been given by its creation. Not its creator. Mechanical man is not what you want. You want the singularity. The singularity is when computers and robots are able to achieve more than any human can.