The main responsibilities of Machinists and Machining and Tooling Inspectors (NOC 72100) in Canada include operating and setting up a variety of machine tools to produce precision parts and instruments, interpreting blueprints, drawings, and specifications to determine dimensions and tolerances of finished workpieces. They also involve aligning and securing holding fixtures, cutting tools, attachments, and materials onto machines, conducting test runs to ensure accuracy of machine operation, inspecting and measuring completed units to ensure they meet specifications, and maintaining, repairing, and calibrating precision measuring instruments and equipment. Additionally, these professionals may also set up and program computer numerically controlled (CNC) machine tools.