Human-Robot Collaboration is a developing field of industrial automation that promises to combine human and robot strenghts. After having analyzed the types of HRC strategies possible, this thesis treats the development of a collaborative robot application for labor efficiency increase on an engine assembly line. In this workstation, balance shafts are manually installed in an engine block and the aim is to free up worker's time by implementing a suitable HRC system while keeping costs and intervention on the preexisting assembly line under control. Operation is analyzed and tasks are divided between cobot and human worker according to their strengths and pace needs of the line, then we moved to design a demonstration workstation.