- Industry: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who sets up and operates numerical control machines or machining centers to perform various machine functions, such as cutting, drilling, milling, reaming, boring, and broaching of metallic and nonmetallic workpieces, utilizing knowledge of machine tool capabilities, machinability of materials, and shop math. Respnsibilities include:
* Reads and interprets blueprints, planning sheets, sketches, and related technical data to determine tooling requirements, setup procedures, control settings, and machining methods and sequences.
* Mounts, aligns, and secures tooling, attachments, and workpiece on machine.
* Selects and installs cutting tools in machine spindle.
* Loads control media, such as tape, card, or disk, in machine controller or enters commands to retrieve preprogrammed instructions from data base.
* Calculates and sets machine controls to position spindle in relationship to workpiece and to regulate factors, such as cutting depth, speed, feed, and coolant flow.
* Starts machine and monitors displays and machine operation to detect malfunctions.
* Stops machine to change cutting tools and setup according to required machining sequence or to measure parts for conformance to blueprint specifications, using precision measuring instruments.
* Enters commands or manually adjusts machine controls to correct malfunctions or out-of-tolerance machining.
* Operates machine manually to perform nonautomated functions and when automatic programming is faulty or machine malfunctions.
* Discusses control media errors with supervisor or programming personnel to resolve problems.
* May clean machine, tooling, and parts.
* May perform machine maintenance.
Industry:Professional careers
A professional who inspects machined workpieces and assemblies at assembly, inspection, or machining station to ensure conformance to specifications. Respnsibilities include:
* Reads blueprints or engineering specifications to obtain product information, such as specified material, surface finish, and dimensions.
* Compares surface finish of workpiece to finish on set of standard blocks making fingertip touch comparison to ensure production of specified surface finish.
* Measures dimensions, such as length, height, and distance, between reference points, using precision instruments, such as micrometers, calipers, dial indicator, and snap gauge, to ensure product meets specifications.
* Locates reference point on part and measures dimensions, such as angle, arc, and radii, using combinations of aids, such as surface plates, parallel bars, angle plates, gauge blocks, V-blocks, sine bars, and precision measuring instruments.
* Reports findings to inspection supervisor.
* May inspect first run parts.
* May set up and try out inspection equipment to ensure accuracy.
* May substitute known values, such as dimensions from blueprints into standard formulas and solve for unknown quantities, using knowledge of algebra, trigonometry, or geometry to determine dimensions not specified in blueprints.
* May test hardness of workpiece surface, using hardness testing machine.
* May be designated according to type of product inspected as propeller inspector; turbine inspector.
Industry:Professional careers
A professional who sets up and operates numerical control machine to cut, shape, or form metal workpieces to specifications. Respnsibilities include:
* Reviews setup sheet and specifications to determine setup procedure, machining sequence, and dimensions of finished workpiece.
* Attaches fixture to machine bed and positions and secures workpiece in fixture according to setup instructions, using clamps, bolts, handtools, power tools, and measuring instruments, such as rule and calipers.
* Assembles cutting tools in toolholders and positions toolholders in machine spindles as specified, using handtools, or inserts cutting tools in specified machine magazines.
* Loads control media, such as disk, tape, or punch card, in machine control console or enters commands to retrieve preprogrammed machine instructions from data base.
* Manipulates controls and enters commands to index cutting tool to specified set point and to start machine.
* Observes and listens to machine operation to detect malfunctions, such as worn or damaged cutting tools.
* Changes cutting tools and location of workpiece during machining process as specified in setup instructions.
* Measures workpiece for conformance to specifications, using measuring instruments, such as micrometers, dial indicators, and gauges.
* Notifies supervisor of discrepancies.
* May adjust machine feed and speed and change cutters to machine parts according to specifications when automatic programming is faulty or machine malfunctions.
* May machine materials other than metal, such as composites, plastic, and rubber.
Industry:Professional careers
A professional who sets up and operates one or more electrical-discharge machines to shape metal workpieces to specifications, following standard charts and manuals, and applying knowledge of electrical-discharge machining processes and methods, electric currents and circuitry, metal properties, and shop mathematics. Respnsibilities include:
* Examines blueprint of product and plans operations.
* Positions and secures workpiece on machine table with clamps, vise, or fixture.
* Positions and secures electrode in holder on surface plate, verifying concentricity, alignment, and depth, using measuring instruments, such as calipers and dial indicators.
* Mounts electrode and holder on machine spindle, using vernier dials on machine to verify alignment of electrode and workpiece.
* Positions gauge blocks, dial indicator, and spindle stop on machine so that descending electrode will stop at specified depth when indicator feeler point touches gauge blocks.
* Turns valve to adjust flow of dielectric coolant over electrode and workpiece or to immerse them in circulating bath.
* Turns controls to adjust machine setting, such as voltage, current, frequency, and electrode feed rate, according to information on charts or knowledge of electrical discharge machining procedures.
* Starts machine and observes beginning of operation.
* May move controls to rotate electrode or workpiece.
* May inspect completed workpiece visually and with templates and other measuring instruments.
* May compute settings from specifications and knowledge of machine capacities.
* May give tool maker specifications, such as allowances between blueprint dimensions and dimensions of electrode to be made.
* Important variables may be indicated by trade names of machine used.
Industry:Professional careers
A professional who sets up single- or multiple-spindle threading machines to thread and cut, ream, or chamfer cylindrical stock according to order specifications, threading charts, and knowledge of threading procedures. Respnsibilities include:
* Compiles dimensions of stock, sequence of machining operations, and type and size of thread from charts and specifications.
* Installs specified feed grips, rotating dies, die cutters (chasers), cutting and reaming or chamfering tool, using micrometers, gauges, and handtools.
* Installs cams, gears, pulleys, pressure tripping mechanism, and adjusts speed control knobs to synchronize transfer and ejection of stock with machine action.
* Operates machine to evaluate its performance.
* Verifies dimensions of workpieces with specifications, using fixed gauges and scale.
* Sharpens die cutters on grinding wheel.
* May set up manually operated threading machine.
Industry:Professional careers
A professional who operates dynamic balance machine to locate points of imbalance on parts, such as spindles, impeller wheels, armatures, rotors, and steam engine flywheels, and balances parts by removing excess metal, using handtools and power tools, or adding metal, using soldering and welding equipment. Respnsibilities include:
* Signals crane operator to position workpiece on machine pedestals.
* Slides drive belt over shaft of workpiece or moves drive wheel against workpiece to connect power source that rotates workpiece.
* Starts machine to rotate workpiece at specified speed.
* Moves controls of machine to locate points of imbalance indicated by light beam from strobe lamp on identification marks of workpiece, position of wave crest of trace pattern on oscilloscope screen, or readings on wattmeter and protractor dial.
* Computes amount of weight to be added to or removed from workpiece, or changes size and location of test weight until zero reading is indicated on ammeter.
* Drills, grinds, chips, or files metal from heavy side, or welds, solders, or rivets metal pieces to light side to correct imbalance, using power drills and grinders, hand file, and soldering and welding equipment.
Industry:Professional careers
A professional who operates one or more electrical-discharge machines to shape metal workpieces to specifications, following standard charts. Respnsibilities include:
* Obtains from job order or verbal instructions such information as electrode to be used, depth setting, and number of workpieces or cavities to be shaped.
* Mounts specified electrode in preset holder on spindle.
* Positions and secures workpiece on machine table or places it in fixture.
* Moves controls to align electrode and workpiece and to set electrode feed rate, depth limit, and electric current.
* Starts machine, turns on flow of dielectric coolant, and observes operation.
* May inspect work visually or with measuring instruments.
Industry:Professional careers
A professional who operates battery of automatic machines that straighten, cut off, head, and sharpen wire to form straight (common) pins. Respnsibilities include:
* Places coil of wire on pedestal stand and threads end of wire through machine to heading dies.
* Adjusts straightening rolls, feeding arm, and stop to diameter and length of wire, using wrenches.
* Starts machine and measures sampling of first pins for conformance to specifications, such as length, head diameter, and angle of point to shank, using micrometers and fixed gauges.
* Replaces dull cutters or point-grinding bars, using handtools, such as wrenches, screwdrivers, and pliers.
* Mounts dies in bench lathe and removes burrs and repolishes head cavity, using stick dipped in polishing paste.
* Empties pin-filled catch pails into tote trays.
Industry:Professional careers
A professional who operates battery of automatic machines that straighten, cut off, head, and sharpen wire to form straight (common) pins. Respnsibilities include:
* Places coil of wire on pedestal stand and threads end of wire through machine to heading dies.
* Adjusts straightening rolls, feeding arm, and stop to diameter and length of wire, using wrenches.
* Starts machine and measures sampling of first pins for conformance to specifications, such as length, head diameter, and angle of point to shank, using micrometers and fixed gauges.
* Replaces dull cutters or point-grinding bars, using handtools, such as wrenches, screwdrivers, and pliers.
* Mounts dies in bench lathe and removes burrs and repolishes head cavity, using stick dipped in polishing paste.
* Empties pin-filled catch pails into tote trays.
Industry:Professional careers
A professional who controls series of machines to machine cast railroad car wheels to specifications. Respnsibilities include:
* Changes chucks, boring bar, and cutting tools according to specifications on production orders, using handtools.
* Pushes buttons on console panel to start machines that perform threading, flanging, boring, inspecting, and other operations to finish wheels.
* Observes action of machines and transfer stations to detect malfunctions.
* Examines machined surfaces of wheels at specified stations to detect defective cutting tools.
Industry:Professional careers
