Remove workpieces from machines, and check to ensure that they conform to specifications, using measuring instruments such as microscopes, gauges, calipers, and micrometers. Observe milling or planing machine operation and adjust controls to ensure conformance with specified tolerances. Position and secure workpieces on machines, using holding devices, measuring instruments, hand tools, and hoists. Study blueprints, layouts, sketches, or work orders to assess workpiece specifications and to determine tooling instructions, tools and materials needed, and sequences of operations. Move controls to set cutting specifications, to position cutting tools and workpieces in relation to each other, and to start machines. Compute dimensions, tolerances, and angles of workpieces or machines, according to specifications and knowledge of metal properties and shop mathematics. Verify alignment of workpieces on machines, using measuring instruments such as rules, gauges, or calipers. Select cutting speeds, feed rates, and depths of cuts, applying knowledge of metal properties and shop mathematics. Move cutters or material manually or by turning handwheels, or engage automatic feeding mechanisms to mill workpieces to specifications. Replace worn tools, using hand tools, and sharpen dull tools, using bench grinders. Select and install cutting tools and other accessories according to specifications, using hand tools or power tools. Record production output. Turn valves or pull levers to start and regulate the flow of coolant or lubricant to work areas. Make templates or cutting tools.