Lay-Out Workers, Metal and Plastic

Lay out reference points and dimensions on metal or plastic stock or workpieces, such as sheets, plates, tubes, structural shapes, castings, or machine parts, for further processing. Includes shipfitters.

Job Task

• Lifts and positions workpiece in relation to surface plate manually or with hoist, using parallel blocks and angle plates.
• Plans and develops layout from blueprints and templates, applying knowledge of trigonometry, design, effects of heat, and properties of metal.
• Examines workpiece and verifies such requirements as dimensions and squareness, using rule, square, and straight-edge.
• Determines reference points and computes layout dimensions and works to tolerances, as close as 0.001 inch.
• Adds dimensional details to blueprints or drawings by other workers and designs templates of wood, paper, or metal.
• Applies pigment to layout surfaces, using paint brush.
• Inspects machined parts to verify conformance to specifications.
• Fits and aligns fabricated parts for welding or assembly operations.
• Details location and sequence of cutting, drilling, bending, rolling, punching, and welding operations, using compass, protractor, dividers, and rule.
• Marks curves, lines, holes, dimensions, and welding symbols onto workpiece, using scribes, soapstone, punches, and hand drill.
• Locates center line and verifies template position, using measuring instruments, including gauge blocks, height gauges, and dial indicators.

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