Tends equipment that imparts decorative bluing or brown-black color, and hard, corrosion resistant surface to gun barrels

mixes solution of acids and metallic salts, according to formula. Places barrels on conveyor that passes through coloring tanks, electrical drying, and preheating oven... [+] More

Tends equipment that imparts decorative bluing or brown-black color, and hard, corrosion resistant surface to gun barrels

mixes solution of acids and metallic salts, according to formula. Places barrels on conveyor that passes through coloring tanks, electrical drying, and preheating oven into steam chamber where controlled temperature and humidity promote oxidation. Rinses barrels in boiling water and holds them against wire or fiber brush wheel to remove loose rust particles and produce satin finish. Repeats rusting and brushing cycle until color of barrel conforms to specified standards. Swabs browned barrels with rust-preventing oil, using rag or sponge. [-] Less

Processes substrate,... [+] More

Processes substrate, electrode, and termination materials to form monolithic ceramic capacitors. Reviews work orders and production schedules to determine processing specifications. Deposits layer of dielectric ceramic material on thermoplastic sheets, using tape casting equipment. Cuts cast sheets into ceramic wafers. Verifies and sorts wafers according to thickness and quality, using thickness gauge and magnifying device.

Deposits electrode material onto wafers, using silk screen printing machine. Heats and compresses stacks of imprinted, ceramic wafers to form laminates, using laminating press. Cuts laminate into chips, using bench-mounted cutting equipment or automatic cutter. Loads chips onto boat and fires chips in kiln to fuse laminated material. Applies conductive termination material to specified edges of ceramic chips, manually or using automatic dipping equipment. Fuses conductive termination material to ceramic chip, using automatic oven. Polishes fused chip, using tumbler. Solders lead wires to ceramic chip, manually or using automatic soldering machine. Encases capacitors in epoxy material. [-] Less

Etches and prints conductive patterns on copper-faced plastic, fiberglass, or epoxy board to fabricate printed circuit boards (PCB's). Cuts board to designated size, using sheet metal shears, following written or verbal instructions. Sands board and either places board in vapor... [+] More

Etches and prints conductive patterns on copper-faced plastic, fiberglass, or epoxy board to fabricate printed circuit boards (PCB's). Cuts board to designated size, using sheet metal shears, following written or verbal instructions. Sands board and either places board in vapor degreaser or immerses board in chemical solution to clean and remove oxides and other contaminants. Sprays or brushes light-sensitive enamel on copper surface and places board in whirler machine to spread enamel evenly, or tends machine that flows light-sensitive resist over board.

Laminates light-sensitive dry film to board, using heat and pressure equipment. Exposes board and circuit negative to light in contact printer for specified period of time to transfer image of circuit to board. Immerses exposed board in solution to develop acid-resistant circuit pattern on surface. Compares board to sample to verify development of pattern. Applies acid resist over sections of pattern not developed, using brush. Immerses board in acid or tends etching machine to etch conductive pattern on copper surface. Immerses board in solution to dissolve enamel. Drills holes in board, using drill press, following work sample, drawing, and diagrams. Installs hardware, such as brackets, eyelets, and terminals, using eyelet machine and hand arbors. Reduces circuit artwork prior to printing onto board, using reduction camera. Prints conductive pattern onto board, using silk-screen printing device. Fabricates PCB used as prototype of production model. [-] Less

Processes microfilm and examines processed film to ensure that quality of microfiche meets established standards.

Loads film into magazine of camera under darkroom conditions, attaches magazine to camera, and splices end of film to leader in machine to facilitate threading film,... [+] More

Processes microfilm and examines processed film to ensure that quality of microfiche meets established standards.

Loads film into magazine of camera under darkroom conditions, attaches magazine to camera, and splices end of film to leader in machine to facilitate threading film, using splicing tape. Flips switches and turns valves to activate machine components and functions, such as blower, squeegee, water flow into processor, and rate of processing chemical replenishment. Monitors machine warning lights to detect processing malfunctions, such as break in film or leader, and takes action to correct malfunction, using knowledge of machine operation. Records film processing information, such as film type, developing speed, and rate of chemical replenishment to maintain film log. Examines processed film to ensure numerical order and clarity of microfiche, using film winder, light table, and magnifier. Marks defective microfiche section of film and lists identifying number of sections on identification sheet to indicate refilming required. Measures optical density of random film section to ensure standard processing, using densitometer. Places film on cutter, aligns markings on cutter and film, and moves cutting instrument across film to separate individual microfiche sections of film. Discards defective microfiche and places acceptable microfiche in envelope for further processing. Mixes processing chemicals to maintain supply, following specified formula, using mixing machine. Processes sample film and measures density of film to enable Microfilm Camera Operator to determine exposure settings for new batches of film. [-] Less

Processes materials used in manufacture of electronic semiconductors, and performs any combination of multiple tasks. Saws, breaks, cleans, and weighs semiconductor materials to prepare materials for crystal growing.

Forms seed crystal for crystal growing, using x-ray equipment, drill, and sanding machine.... [+] More

Processes materials used in manufacture of electronic semiconductors, and performs any combination of multiple tasks. Saws, breaks, cleans, and weighs semiconductor materials to prepare materials for crystal growing.

Forms seed crystal for crystal growing, using x-ray equipment, drill, and sanding machine. Loads semiconductor material, seed crystal, and dopant into crystal growing furnace and monitors furnace to grow crystal ingot of specified characteristics. Grinds ingot to attain specified diameter and cylindricity, using grinding machine. Locates crystal axis of ingot, using x-ray equipment, and grinds flat on ingot. Saws ingot into wafers, using power saw. Etches, laps, polishes, and heat treats wafers to produce wafers of specified thickness and finish, using etching equipment, lapping and polishing machines, and furnace. Cleans materials, seed crystals, ingots, and wafers, using cleaning, etching, and sandblasting equipment. Inspects materials, ingots, and wafers for surface defects. Measures dimensions of ingots and wafers, using precision measuring instruments. Tests electrical characteristics of materials, ingots, and wafers, using electrical test equipment. [-] Less

Tends machine and ovens to mix and dry ingredients used to fabricate carbide cutting-tool inserts, following work orders and charts

reads work order to determine amount and grade of carbide specified. Computes amounts of ingredients required, using charts. Scoops ingredients from... [+] More

Tends machine and ovens to mix and dry ingredients used to fabricate carbide cutting-tool inserts, following work orders and charts

reads work order to determine amount and grade of carbide specified. Computes amounts of ingredients required, using charts. Scoops ingredients from canisters, and weighs ingredients on scale to obtain specified amounts. Pours ingredients into cylindrical-tumbler mixing machine, starts tumbler, and stops it after specified time. Pours mixed ingredients into pans, and places them in decarbonizing oven to dry and burn off impurities. Removes pans from oven, adds other ingredients, and sifts mixture through screen to obtain powder of even consistency. Cleans equipment after each batch. [-] Less

Etches specified portions of metal parts and materials used in manufacturing aircraft, using immersion equipment, templates, handtools, and precision measuring instruments

reads work order, blueprints, and process specifications to determine location of etch, finished dimensions, and method and sequence of operations.... [+] More

Etches specified portions of metal parts and materials used in manufacturing aircraft, using immersion equipment, templates, handtools, and precision measuring instruments

reads work order, blueprints, and process specifications to determine location of etch, finished dimensions, and method and sequence of operations. Cleans surface of parts and materials to ensure uniform adhesion of maskant. Applies maskant to surfaces to be etched, scribes etch lines, using template, and removes maskant from etch areas. Immerses parts and materials in etching solution for specified time, manually or using hoist. Removes objects from etch solution, rinses objects with water, and removes remaining maskant. Measures etched parts and materials for conformance to specifications, using micrometers, scales, and other precision measuring instruments. May immerse parts and materials in successive baths and rinses to perform surface processing in addition to etching, such as pickling, chromodizing, passivating, degreasing, and stripping, and be designated process equipment operator. [-] Less

Processes crab meat for... [+] More

Processes crab meat for canning, freezing, or packing, performing any combination of following tasks. Separates claws from crabs, positions claws in metal holder used to facilitate breaking claw shells, and breaks shells of claws and crabs, using knife or metal rod. Picks meat from shells, using knife and fingers. Feels meat for presence of shell and removes shell pieces by hand. Inspects meat for discoloration and discards meat not meeting company requirements. Places meat in containers for further processing. Gathers filled containers of meat, places containers on scale, and adds or removes meat from containers to obtain specified weight. Closes lids of containers, places containers in cartons, and seals cartons, using tape. May disjoint legs and body of large crabs, using power saw, and be known as sawyer. May remove crab meat from smaller ends of leg segments, using pedal-controlled air jet. [-] Less

Operates machines to process dental-amalgam and tests amalgam with interferometer. Anneals ingot of tin, copper, and silver to obtain specified molecular characteristics annealer. Cuts ingot into chips of uniform size, using engine lathe. Pours chips into hopper of grinder and... [+] More

Operates machines to process dental-amalgam and tests amalgam with interferometer. Anneals ingot of tin, copper, and silver to obtain specified molecular characteristics annealer. Cuts ingot into chips of uniform size, using engine lathe. Pours chips into hopper of grinder and starts machine to grind chips into microgranules of specified size. Loads granules into elutriator and turns valve to regulate flow of water that forces granules through sieves to separate granules, according to size. Loads moist granules in drying machine or oven. Mixes specimen quantity of alloy with mercury, using amalgamator machine or mortar and pestle, and packs mixture into mold. Removes amalgam from mold and places amalgam between glass panels of instrument. Counts black bands appearing within circle of instrument and informs supervisor of number of bands. [-] Less

Processes materials into finished or semifinished electronic components, performing any combination of following tasks. Reads work orders, formulas, and processing charts, and receives verbal instructions to determine specifications and sequence of operations. Weighs or measures specified ingredients and binding agents,... [+] More

Processes materials into finished or semifinished electronic components, performing any combination of following tasks. Reads work orders, formulas, and processing charts, and receives verbal instructions to determine specifications and sequence of operations. Weighs or measures specified ingredients and binding agents, using scales and graduates. Mixes and grinds material, using manual or automatic machines and equipment. Loads, unloads, monitors operation, and adjusts controls of various processing machines and equipment that bake, diffuse, cast, x ray, cut, polish, coat, plate, silk screen, and perform similar operations to prepare, combine, or change structure of materials to produce compositions with specific electronic properties. Cleans materials as required prior to processing operations, using solvents. Inspects, measures, and tests components according to specifications, using measuring instruments and test equipment. Encloses components in housings. Stamps or etches identifying information on finished component. Counts, sorts, and weighs processed items. Maintains manual or computerized records of production and inspection data. May be designated according to duties performed as baker, beads; firer; pellet-preparation operator; preforming-machine operator; vacuum-evaporation operator; weight-count operator. Assembly of processed materials, parts, and components is covered under electronics assembler and electronics assembler, dev. [-] Less