Sets up and adjusts automatic compression, injection, or transfer machines used to mold plastic materials to specified shapes, following blueprints, and utilizing knowledge of machine functions. Reads specifications to determine machine setup and prescribed temperature and time settings. Positions, aligns, and secures assembled mold or mold components, and machine accessories, onto machine press bed, according to guide marks, using hoist, power tools, and hand tools. Attaches connecting lines, such as air, oil, or water to mold, and adjusts controls to regulate mold temperature. Sets machine controls and turns dials to regulate specified machine forming pressure and plastic curing time in mold. Starts machine to produce sample products. Measures and visually inspects sample product for surface and dimensional defects, using a microscope, micrometer, and gauges, and adjusts machine setup to eliminate defects. Repairs and maintains machines and auxiliary equipment, using hand tools and power tools. Communicates with co-workers and supervisor to receive instructions and coordinate activities.