A millwright performs installations and repair work on large industrial machines, especially the equipment that is used in manufacturing facilities and machinist shops. He or she usually decides where big equipment will go in a facility, oversees the installation process, assembles parts, conducts test runs, and fine tunes finished jobs. When a machine stops working properly, the factory will call on a millwright to troubleshoot, make repairs, and replaced damaged parts. Professionals occasionally specialize with certain types of machinery, though most have a very broad understanding of many different kinds of equipment, from large electricity generators to wind turbines to assembly line robots.