As a mechanical engineering intern, you prepare calculations and reports, gain experience with engineering systems, integrate tracking plans, and perform analysis of mechanical design choices. You may help test products, interact with various members of a project team, and create or modify CAD models. As an intern, your responsibilities are limited, and most employers consider gaining experience to be the most important part of your job. Many mechanical engineering interns focus on building professional relationships in the hope of landing a permanent job after graduating. You may need to develop your skills in engineering, CAD software, and prototyping during your internship.