To build everything from robots to aircraft, factories all over the world depend on the skilled work of machinists and tool and die makers. Starting with sketches, blueprints, or computer-aided design (CAD) files, machinists set up the machines that make parts for all kinds of products. They then take large pieces of materials like steel, aluminum, plastic, and other materials and feed them into the machines. Once the parts are made, they are filed to meet project specifications. The final step is to check for accuracy and give a final smoothing and polish. Learn about this exciting career today!