- Industry: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who tends machines that mix, mold, and bake iron powder and plastic to form spatterless bullets for small arms ammunition. Respnsibilities include:
* Measures, weighs, and pours specified quantities of iron powder, plastic crystals, and solvent into steam-heated mixing machine to coat each particle of iron powder with adhesive plastic.
* Starts machine.
* Observes dials, indicators, and gauges, and turns valves to regulate and maintain prescribed heat and pressure during designated mixing period.
* Opens hatch in mixer bottom to dump dried, coated iron powder onto shaker screen that removes clinkers.
* Signals industrial-truck operator to move cans of sifted powder and to lift them to platform above bullet molding press.
* Scoops powder from can and sifts it through screen to remove oversize particles and to fill hopper of bullet molding machine.
* Starts machine that compresses iron powder in molds to form bullets.
* Examines bullets for malformation and replaces worn punches and dies, using handtools.
* Regulates conveyor speed and electric oven temperature by pressing buttons and switches to bake and cool bullets.
* Measures sample bullets, using dial indicator and fixed gauges.
* Tests samples for hardness, using special device that measures force required to break off bullet nose.
* Rebakes rejected bullets to reduce diameter or increase hardness to meet specifications.
Industry:Professional careers
A professional who operates mechanical units of automated production machinery to produce deposited carbon resistors for use in electronic equipment. Respnsibilities include:
* Turns valves to admit methane and nitrogen gases into carbon-coating furnace and sets furnace temperature for computer control according to work order.
* Presses buttons and turns valves to start vacuum pump of terminating chambers and set rate for back-filling chambers with argon gas, preparatory to sputtering gold contacts on carbonized ceramic cores.
* Sets thermostats to heat curing oven of encapsulating machine and water vat of air-leak detection unit to specified temperatures.
* Turns valve to spray water over resistors emerging from curing oven.
* Observes temperature gauges, pressure gauges, and machine operation to detect mechanical failures in automated machinery.
* Notifies maintenance mechanic of machinery malfunction.
Industry:Professional careers
A professional who sets up and operates furnaces to grow semiconductor crystals from materials, such as silicon, quartz, or gallium arsenide. Respnsibilities include:
* Loads furnace with seed crystal, dopant, and crystal growing materials, such as polysilicon, quartz, gallium arsenide, or remelt.
* Reads work order and adjusts furnace controls to regulate operating conditions, such as power level, temperature, vacuum, and rotation speed, according to crystal growing specifications.
* Monitors meltdown of growing material and crystal growth, and adjusts furnace controls.
* Shuts down furnace and unloads crystal ingot after cooling.
* May clean inside furnace, using vacuum cleaner and cleaning supplies, and replace furnace liner and other parts.
* May weigh and crop crystal ingot, slice sample wafer, measure and test ingot for resistivity, and determine crystal orientation.
* May operate computer controls to regulate furnace conditions.
Industry:Professional careers
A professional who sets up and operates furnaces to grow semiconductor crystals from materials, such as silicon, quartz, or gallium arsenide. Respnsibilities include:
* Loads furnace with seed crystal, dopant, and crystal growing materials, such as polysilicon, quartz, gallium arsenide, or remelt.
* Reads work order and adjusts furnace controls to regulate operating conditions, such as power level, temperature, vacuum, and rotation speed, according to crystal growing specifications.
* Monitors meltdown of growing material and crystal growth, and adjusts furnace controls.
* Shuts down furnace and unloads crystal ingot after cooling.
* May clean inside furnace, using vacuum cleaner and cleaning supplies, and replace furnace liner and other parts.
* May weigh and crop crystal ingot, slice sample wafer, measure and test ingot for resistivity, and determine crystal orientation.
* May operate computer controls to regulate furnace conditions.
Industry:Professional careers
A professional who controls and monitors operation of epitaxial reactor to deposit layer of semiconductor material, such as gallium arsenide or silicon, onto semiconductor wafer surface in production of electronic components, such as transistors, diodes, and integrated circuits, and tests sample processed wafers to evaluate epitaxial layer properties, such as thickness and resistivity, using testing equipment. Respnsibilities include:
* Cleans semiconductor wafers, using cleaning equipment such as chemical baths and automatic wafer cleaners, to prepare wafers for deposit of epitaxial layer.
* Places wafers on wafer holder (suspector), using tweezers or vacuum wand, to load reactor.
* Pushes buttons, flips switches, turns dials, and observes gauges to set and adjust reactor temperature and gas pressure to specified levels and to start reactor cycle.
* Monitors temperature and gas gauges during processing cycle and turns dials to adjust temperature and gas levels.
* Tests epitaxial layer on wafers, using testing equipment, to evaluate thickness and resistivity of layer.
* Records production data in logbook and processing documents.
* Cleans and maintains equipment and work area.
* May compute production statistics, using calculator.
Industry:Professional careers
A professional who operates ion implanting machine to implant semiconductor wafers with gases, such as arsenic, boron, or phosphorus, to implant electrical properties in wafers. Respnsibilities include:
* Turns valves, flips switches, and presses buttons to start and regulate flow of gases into implant machine.
* Places semiconductor wafers in holders, such as carousel, wheels, or boats, using tweezers.
* Places loaded holder in machine and secures clamps.
* Presses buttons to start feeding and implanting process.
* Monitors gas gauges and meters and turns dials to adjust gases, following specifications, if required.
* Maintains processing reports.
* May test semiconductor wafers, using test equipment, to verify that voltage, current, and resistivity of implantation meet company specifications.
Industry:Professional careers
A professional who prepares ampoule containing charge (specified amounts of materials for crystal growing process) to grow gallium arsenide crystal ingot in crystal growing furnace. Respnsibilities include:
* Cleans ampoules, plugs, and boats, using etch tanks and sandblasting equipment.
* Operates saw to cut remelt into sections of specified size.
* Immerses remelt into etch tank to remove contaminants, and dries remelt in oven.
* Measures and weighs specified amounts of crystal growing material, such as seed, seed powder, remelt, and dopant, and loads material into boat and ampoule, following prescribed procedure.
* Attaches ampoule to diffusion pump to remove air from ampoule, and seals ampoule, using blowtorch.
* Transports sealed ampoule to holding rack in furnace room for further processing by crystal grower.
* Records production information.
Industry:Professional careers
A professional who cleans and maintains wafer processing machines and equipment and mixes chemical solutions, following production specifications. Respnsibilities include:
* Reads work orders and specifications to determine machines and equipment requiring replenishment of chemical solutions.
* Measures and mixes chemical solutions, using graduated beakers and funnels.
* Pours chemical solutions into wafer processing machine tanks to replenish machine supplies.
* Cleans furnace accessories, such as quartz tubes and stainless steel tubing, using chemical solutions.
* Removes broken quartzware and wafers from furnace and vacuums interior of furnace.
* Cleans processing machines and equipment, using cleaning solvent and cloth.
* Removes and replaces empty machine and equipment gas tanks.
* Measures furnace temperatures, using thermal rod or thermocouple, and turns knobs on furnace control panel to adjust temperature.
* May re-stock storage shelves and work station with supplies, such as chemicals, alcohol, and rubber gloves.
* May maintain log records of machine and equipment processing readings.
Industry:Professional careers
A professional who performs combination of following duties to produce solid-propellant rocket fuel, prepare rocket motor cases for inserting propellant, cast and cure propellant, install propellant and ignition components in motor case, prepare assembly for static testing, and pack assembly for shipment. Respnsibilities include:
* Blends fuel ingredients and tends roller mill that grinds mixture to uniform consistency from remote control instrument panel, viewing operations on television monitor.
* Lowers motor case into degreasing pit filled with solvent, using hoist.
* Transfers case to sandblasting cabinet and starts compressor to sandblast unit, removing rust and scale.
* Paints motor case, using spray gun.
* Weighs out prescribed ingredients for insulating interior of case and starts agitator in mixing tank to blend ingredients to desired consistency.
* Sprays insulating liner onto case interior, using spray gun.
* Hoists case into oven to cure lining preparatory to inserting propellant.
* Fills fuel transfer can with propellant mixture, according to prescribed safety procedures, bolts lid onto can, and starts vibrator to remove air bubbles from mixture.
* Transfers filled can to casting area, using lift truck.
* Brushes mold-releasing lubricant onto casting core to facilitate removal of propellant after curing.
* Positions motor case in rack or pit and aligns casting core in case, using gauge and following markings on case interior.
* Couples safety hose to valve in lid of transfer can and turns air valves to force propellant into case.
* Bolts hydraulic jack to retainer ring of case and turns valve from behind safety barrier to force core into position, using system of mirrors to regulate movement of core.
* Slips plastic bag and metal cap over assembly and transfers filled case to curing oven.
* Sets automatic temperature controls of oven according to critical specifications for each type of propellant and size of motor.
* Removes casting core from propellant after prescribed curing time, using hydraulic jack, and trims excess propellant from rim of case, using remote controlled air-powered knives.
* Secures retaining collars, exhaust nozzle, ignition cable, and igniter motor in motor case, using torque and impact wrenches, to ensure alignment of all components.
* Hoists motor onto cradle of scale and records weight.
* Determines center of gravity of assembly, using centering devices and standard formula.
* Stencils identity and motor specifications on case, using stencil and roller.
* Prepares assemblies for static testing by transferring units to and from temperature-controlled rooms, securing them to test stand, recording test instrument readings, and disassembling faulty units for inspection.
* Slides completed assemblies into pressurized shipping containers, using hoist and aligning devices to prevent damage during shipment.
* Seals container, using gaskets, bolts, tape, resilient packing, and moisture-absorbing agents.
* May be known as Mold-Release Worker; Rocket-Assembly Operator.
* When casting smaller fuel elements in molds to produce free-standing grain (fuel element), wrapping grain in inhibitor sheath to control rate of burning, and manually loading grain into motor case or container, is designated Technical Operator, Grain Preparation.
Industry:Professional careers
A professional who weighs pigments for use in production of hard-surface floor covering. Respnsibilities include:
* Reviews pattern schedule to determine colors required.
* Moves bags of designated pigments from storage area to scales, using handtruck.
* Weighs prescribed pigments, dumps pigment into container, and marks container to indicate sequence in which color should be charged into mixer.
Industry:Professional careers
