A mechanical assembler puts together or fabricates components for machines or mechanical products. In this career, you can work on a production line or assemble complete products in a workshop or factory setting. Your duties and responsibilities vary slightly depending on the products you assemble. In some positions, you read blueprints, gather components, and align them to ensure full functionality. Some assemblers also have testing duties, testing each machine and making adjustments as necessary. In some cases, you use tools to fabricate parts or connect components. You may add lubricants, coatings, or paint as needed.