Be it any stream of engineering, when it comes to bringing the concepts to reality, the work of a Mechanical Engineer begins.
Since anything that needs to be physical needs manufacturing processes, it is important that a Mechanical Engineer is involved in the process.
Coming to the design of microprocessors. The role of a mechanical engineer is to comprehend the requirement of the mechatronic system and state the same to the concerned electronics engineer. The design is seldom carried out by a mechanical engineer.
Coming to the manufacturing, Mechanical Engineers have complete responsibility in this regard. Right from defining the process parameters to actually manufacturing the components, tedious efforts need to be put in since the scale of manufacturing is in microns of accuracy. Designing the manufacturing process and successful execution can be attributed to a Mechanical Engineer.
The scope is wide provided the engineer has a strong foundation of precision manufacturing and mechatronics & microprocessors.