- Industry: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who sets up and operates milling machine equipped with built-in or attached tracing mechanism that guides cutting tool in parallel relationship to stylus that moves along three-dimensional model or two-dimensional template to mill contour of model or profile of template on metal workpieces. Respnsibilities include:
* Studies blueprint, layout on workpieces, and template or model to determine tooling, sequence of operations, and finished dimensions of workpiece.
* Positions and secures workpiece and model or template parallel to each other on machine bed or angle plate, using height gauges, parallel blocks, sine bars, steel rule, wrenches, and clamps.
* Moves handwheel to position cutting tool on workpiece in specified relation to stylus on model or template.
* Observes operation and makes adjustments to ensure conformance of milled workpiece to specifications.
* Verifies conformance of workpiece, using dial and surface gauges, templates, calipers, and micrometers.
* May turn lever to start flow of coolant on machining area.
* May mill plastics or other nonmetallic materials.
Industry:Professional careers
A professional who sets up and operates various types of tracer-controlled profile milling machines to mill duplicates of template or model contour on metal workpieces, such as cams, metalworking dies, aircraft parts, and automobile prototype parts, determining tooling according to knowledge of profiling procedures. Respnsibilities include:
* Studies blueprint, dimensioned sketch, or layout on workpiece to visualize milling required and plans sequence of operations.
* Lifts and positions workpiece on machine bed manually or using hoist.
* Secures workpiece and template or model on angle plates or machine table, using clamps, wrenches, and such devices as height and planer gauges, parallel blocks, shims, and screwjacks.
* Selects cutting speeds, depth of cut, cutting tool, and corresponding tracing stylus.
* Positions and secures cutter and stylus in respective spindles.
* Turns switches or dials to set feed and speed and to position cutter and stylus at reference points on workpiece and template or model allowing for tool pressure, die clearance, and amount of stock to be left for subsequent removal.
* Engages feeding mechanism.
* Observes machining operation and adjusts cutter position, cutting speed, and feed rate to ensure that workpiece conforms to specifications.
* Verifies conformance of milled workpiece to specifications, using gauges, calipers, and micrometers.
* May work on nonmetallic materials.
* May make cutters and styluses.
* May inspect workpiece on projection (shadow) comparator machine to determine if profiled cuts align with projected drawing.
Industry:Professional careers
A professional who sets up and operates milling machine to mill flat or curved surfaces on metal workpieces, such as machine, tool, or die parts, analyzing specifications and selecting tooling, according to knowledge of milling procedures. Respnsibilities include:
* Studies blueprints or layout on workpiece to determine sequence of operations and finished dimensions of workpiece.
* Lifts and positions workpiece on machine table manually or with hoist, and secures it, using clamps, bolts, and fixtures.
* Selects feed rate, cutting speed, depth of cut, and milling cutter, applying knowledge of metal properties and shop mathematics.
* Mounts milling cutter in spindle, and positions cutter and workpiece in relation to each other.
* Verifies alignment of workpiece, using measuring instruments, such as dial indicator and thickness gauge.
* Turns handwheel to feed workpiece to cutter or vice versa.
* Turns valve handle to start flow of coolant or lubricant on work area, starts machine, and engages automatic feed.
* Periodically adjusts machine controls to achieve specified tolerances.
* May compute indexing ratios and set up and operate dividing head to index workpiece for such operations as milling helical cuts.
* May mount different tool in place of cutter and perform other operations, such as drilling and boring.
* May set up and operate attachments, such as pantograph mechanisms to duplicate contours from models or profiles from templates, or universal head to mill at angles.
* May work on nonmetallic materials.
* May set up machines for other workers.
Industry:Professional careers
A professional who sets up and operates planers that reciprocate workpieces against stationary bar tools to plane and groove large metal workpieces, such as castings for metalworking dies and machine ways, analyzing specifications and selecting tooling according to knowledge of machine planing procedures. Respnsibilities include:
* Studies blueprint or layout on workpiece to visualize planing to be done, or marks layout on workpiece with scribe, and plans sequence of operations.
* Selects method of holding workpiece so that entire surface to be planed will remain parallel to table during planing operation.
* Lifts workpiece manually or with hoist, and positions and secures it on table, using shims, parallel blocks, clamps, and wrenches.
* Verifies workpiece position with gauges, rule, square, or other instrument.
* Selects and mounts cutting tools on railhead or side head.
* Selects and sets cutting speed, length of stroke, and depth of cut, according to knowledge of metal properties and shop mathematics.
* Sets stops to limit length of stroke and to actuate table reversing mechanism.
* Moves controls to position tool in relation to workpiece.
* Starts table reciprocation, turns handwheels to feed tool to or across workpiece between cuts, and engages feed.
* Observes operation and verifies conformance of planed workpiece to specifications within tolerances to plus or minus 0.001 inch, using measuring instruments, such as surface gauge, planer gauge, and micrometer.
* May operate bench grinder to sharpen tools.
* May turn valve handle and direct flow of coolant or lubricant against tool and workpiece.
* May set up and operate milling attachment instead of rail or side head tool.
* May plane or mill nonmetallic materials.
* May set up and operate rotary planer which reciprocates cutting tool against workpiece mounted on rotating machine bed and be designated Rotary Planer Set-Up Operator.
Industry:Professional careers
A professional who sets up and operates planer-type milling machine that moves workpiece back and forth against rigidly held rotating cutters to mill workpieces, such as castings and machine parts, according to knowledge of planer-mill operating procedures. Respnsibilities include:
* Studies blueprints or layout on workpiece to determine machine set-up, and sequence of machining operations.
* Lifts workpiece, using hoist, to position on machine bed.
* Secures workpiece in holding fixture, using wrenches, and verifies position, using gauges, calipers, or square.
* Selects cutting tool and mounts it in spindle, using handtools.
* Adjusts controls to set feed rate, speed of cutting tool, and depth of cut.
* Turns controls to position cutting tool relative to workpiece, starts machine, and engages automatic feed.
* Observes operation, stops machine to change cutting tool, and adjust controls.
* Verifies conformance of workpiece to finished specifications, using precision measuring instruments.
* Removes workpiece from machine bed.
Industry:Professional careers
A professional who sets up and operates multiaxis, numerically controlled routing machine to cut and shape metallic and nonmetallic workpieces. Respnsibilities include:
* Selects and positions workpiece on machine bed.
* Threads perforated or magnetic tape through read head.
* Inserts precision indicator in machine chuck, and depresses switches to jog chuck into contact with workpiece, synchronize tape and tool, and record setup point.
* Retracts chuck, and loads and secures first preset cutting tool and holder.
* Starts machine and observes operation.
* Compares numerical data displays with specifications on operation sheets, and uses scales, gauges, and micrometer to verify machining operations.
* Removes and replaces cutting tool when worn or damaged or when new cutting tool is specified by operation sheets.
* Assembles and presets cutting tools at bench during tape-controlled machining to reduce machine downtime.
* Repositions workpiece for intermediate setups when specified on operation sheets, and removes and replaces workpiece at end of machining cycle.
* Verifies new tapes by starting machine and observing operation to detect errors, plotting two-dimensional movement with recording stylus, or by machining sample workpiece and inspecting each cut, using precision gauges.
Industry:Professional careers
A professional who sets up and operates multiaxis numerical-control milling machine to mill surfaces of metallic and nonmetallic workpieces according to specifications and tooling instructions, applying knowledge of machining methods. Respnsibilities include:
* Threads perforated or magnetic tape through read-head in control console, or enters commands into control panel, to retrieve preprogrammed machine data from mainframe computer.
* Inserts precision indicator in machine spindle, and depresses switches to jog spindle into contact with workpiece, synchronize tape and tool, and record setup point.
* Retracts spindle and loads and secures first preset tool and holder.
* Starts machine and observes cutting operation.
* Compares numerical data display with specifications on operations sheet.
* Assembles and presets tooling for next operation during automated cycle to reduce machine downtime.
* Replaces milling tools with drilling and boring tools at specified change points to reduce or eliminate subsequent machining of workpiece on another machine.
* May operate machine on preliminary dry run before machining first part to detect errors in tape or computer program.
* May be designated according to make, trademark, or configuration of machine, characteristics of control system, or type of product as contour-path tape-mill operator; planer-type milling-machine operator, numerical control; profile-mill operator, tape control; tape control skin-or-spar-mill operator; tape keller operator.
Industry:Professional careers
A professional who sets up and operates one or more broaching machines to broach internal or external cylindrical or flat surfaces of metal workpieces according to specifications, tooling instructions, standard charts, and knowledge of broaching. Respnsibilities include:
* Reads blueprint, job order, or specifications to determine dimensions and tolerances, and tooling instructions, such as holding fixtures, cutting speed, and cutting tools (broaches) to be used.
* Lifts workpiece manually or with hoist and positions and secures it in fixture.
* Installs broach or ram, using wrenches.
* Moves controls to set specified depth of cut and ram speed, and to start ram that pushes or pulls broach along surface of work.
* Pulls lever to start flow of coolant or lubricant on work area.
* Verifies conformance of broached workpiece to specifications, using measuring instruments, such as fixed gauges, calipers, and micrometers.
* May broach nonmetallic materials.
* May change worn broaches, using handtools.
Industry:Professional careers
A professional who sets up and operates cam-controlled tread-engraving (skid) machine to mill tread designs in metal molds for rubber tires, according to specifications. Respnsibilities include:
* Examines work order or receives verbal instruction to ascertain cams, gearing ratio, and templates to be used.
* Lifts mold half with hoist and secures it in work-holding fixture on machine.
* Mounts specified cutting tool in machine spindle.
* Positions and secures drum cam (grooved cylinder) corresponding to specified tread design number in machine, using wrenches.
* Rotates mold in fixture to align specified design location on mark with mark and design number on fixture corresponding to mounted cam.
* Moves controls to position tool in relation to mold and starts machine.
* Turns handwheel and simultaneously exerts pressure on hand lever to traverse pin against cam and tool against mold to mill (engrave) tread pattern in mold, adjusting action according to movement and resistance sensed by hands on controls.
* Mounts systematically varied sequence of cams which produce tread pattern of minimum tire noise.
* Verifies engraved mold for conformance to specifications, using precision measuring instruments such as micrometers, calipers, and dial indicators.
* May setup and operate engraving machine equipped with template tracing stylus and be designated Tire Mold Engraver, Numerical Control.
Industry:Professional careers
A professional who sets up and operates cam-controlled tread-engraving (skid) machine to mill tread designs in metal molds for rubber tires, according to specifications. Respnsibilities include:
* Examines work order or receives verbal instruction to ascertain cams, gearing ratio, and templates to be used.
* Lifts mold half with hoist and secures it in work-holding fixture on machine.
* Mounts specified cutting tool in machine spindle.
* Positions and secures drum cam (grooved cylinder) corresponding to specified tread design number in machine, using wrenches.
* Rotates mold in fixture to align specified design location on mark with mark and design number on fixture corresponding to mounted cam.
* Moves controls to position tool in relation to mold and starts machine.
* Turns handwheel and simultaneously exerts pressure on hand lever to traverse pin against cam and tool against mold to mill (engrave) tread pattern in mold, adjusting action according to movement and resistance sensed by hands on controls.
* Mounts systematically varied sequence of cams which produce tread pattern of minimum tire noise.
* Verifies engraved mold for conformance to specifications, using precision measuring instruments such as micrometers, calipers, and dial indicators.
* May setup and operate engraving machine equipped with template tracing stylus and be designated Tire Mold Engraver, Numerical Control.
Industry:Professional careers
