- Industry: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who sets up and operates grinding equipment to grind precision cutting tools and dies from tungsten carbide and high-speed steel, working from blueprints and to tolerances of 0.0001 inch. Respnsibilities include:
* Plans and lays out work and sets up equipment, using variety of precision measuring devices and machine attachments and fixtures.
* Grinds tools and dies to prescribed dimensions by turning handwheels or adjusting controls to feed work against grinders.
* Measures dimensions with precision gauges.
* Removes, dresses, and installs emery, diamond-impregnated, and diamond-charged cast-iron grinding wheels.
Industry:Professional careers
A professional who operates compressed-air or steam-driven machine to sharpen large drills, such as rock drills, used in construction, mining, quarrying, and well-drilling. Respnsibilities include:
* Places cutting end of drill in forge to heat cutting edge to increase malleability.
* Inserts heated drill into die space on machine.
* Starts hammering action of die to shape cutting edge of drill.
* Stops machine and removes edged drill.
* Tempers drill by heating it in forge and quenching it in water, brine, or oil.
Industry:Professional careers
A professional who operates compressed-air or steam-driven machine to sharpen large drills, such as rock drills, used in construction, mining, quarrying, and well-drilling. Respnsibilities include:
* Places cutting end of drill in forge to heat cutting edge to increase malleability.
* Inserts heated drill into die space on machine.
* Starts hammering action of die to shape cutting edge of drill.
* Stops machine and removes edged drill.
* Tempers drill by heating it in forge and quenching it in water, brine, or oil.
Industry:Professional careers
A professional who sets up and operates variety of gear-cutting machines, such as gear shapers, hobs, and generators to machine spline, rack, or gear teeth on metal blanks, analyzing specifications according to knowledge of gear designs, shop mathematics, and gear machining procedures. Respnsibilities include:
* Studies blueprint to visualize machining required, and plans sequence of operations.
* Selects machine and method of holding workpiece.
* Computes machine settings from gear specifications.
* Positions and secures workpiece to cutting angle on arbor, in chuck or other holding device, using wrenches.
* Selects, positions, and secures cutters in toolhead, in spindle, or on arbor.
* Sets feed rates and rotation speeds of cutters and workpiece in relation to each other by selecting and mounting gears, cams, or templates, or by moving levers.
* Moves controls to set cutting speeds and depth of stroke and cut for reciprocating cutters, and to position tool and workpiece in relation to each other.
* May select and mount guides to impart twisting motion to spindle for cutting helical gears.
* Starts machine, turns valve handle to start flow of coolant against cutter and workpiece.
* Verifies conformance of machined gear to specifications, using gear measuring wires, involute checker, master gears, optical comparator (shadowgraph), and other special gear inspection equipment.
* May operate broaching machine to broach internal splines or gears.
* May work on nonmetallic materials.
* May be required to have experience with particular gear type, material, or size, type, or trade name of machine.
Industry:Professional careers
A professional who sets up and operates precision gear grinding machine with special indexing equipment to grind master and precision gears, usually on custom basis, analyzing specifications and selecting tooling according to knowledge of gear grinding procedures. Respnsibilities include:
* Studies blueprints and machining instructions to determine grinding operations and to plan sequence of operations.
* Computes machine indexing ratios and cam dimensions for specified spacing and contour of gear teeth, using shop mathematics.
* Selects index plate, cams, grinding wheel, feed rates, grinding speed, and depth of cut, according to computations, gear specifications, and knowledge of gear design, metal properties, and abrasives.
* Positions and secures index plate, cams, and grinding wheel in machine, using wrenches and measuring devices.
* Sets up automatic dressing device to dress wheel to specified profile.
* Moves controls to set synchronized rotation speeds and feed rates.
* Positions and secures workpiece on mandrel between centers or in chuck, and turns handwheels to position workpiece and wheel, verifying positions with thickness gauges, dial indicators, and micrometers.
* Turns valve handle and directs flow of coolant against wheel and workpiece.
* Moves controls to index workpiece and feed wheel to workpiece, adjusting depth of cut in part by sight and feel.
* Verifies dimensions of ground workpiece for conformance to specifications, using gear measuring wires and involute checker. May grind nonmetallic materials.
* May be required to have experience with particular type of gear, precision level, or type or trade name of machine.
Industry:Professional careers
A professional who sets up and operates precision gear grinding machine with special indexing equipment to grind master and precision gears, usually on custom basis, analyzing specifications and selecting tooling according to knowledge of gear grinding procedures. Respnsibilities include:
* Studies blueprints and machining instructions to determine grinding operations and to plan sequence of operations.
* Computes machine indexing ratios and cam dimensions for specified spacing and contour of gear teeth, using shop mathematics.
* Selects index plate, cams, grinding wheel, feed rates, grinding speed, and depth of cut, according to computations, gear specifications, and knowledge of gear design, metal properties, and abrasives.
* Positions and secures index plate, cams, and grinding wheel in machine, using wrenches and measuring devices.
* Sets up automatic dressing device to dress wheel to specified profile.
* Moves controls to set synchronized rotation speeds and feed rates.
* Positions and secures workpiece on mandrel between centers or in chuck, and turns handwheels to position workpiece and wheel, verifying positions with thickness gauges, dial indicators, and micrometers.
* Turns valve handle and directs flow of coolant against wheel and workpiece.
* Moves controls to index workpiece and feed wheel to workpiece, adjusting depth of cut in part by sight and feel.
* Verifies dimensions of ground workpiece for conformance to specifications, using gear measuring wires and involute checker. May grind nonmetallic materials.
* May be required to have experience with particular type of gear, precision level, or type or trade name of machine.
Industry:Professional careers
A professional who sets up and operates gear inspection equipment to measure curvature of gear tooth, distance between teeth, concentricity of gear, profile and surface dimensions, surface finish, and material hardness of production and prototype gears, utilizing knowledge of gear inspection techniques and procedures. Respnsibilities include:
* Reads blueprints or specifications to determine dimensions and tolerances.
* Mounts master gears on testing machine, attaches recording instrument leads and styluses to gear, and starts machine to calibrate machine instruments.
* Mounts and secures gear on spindle or arbor of machine, sets instrument stylus on gears, and turns instrument dials to zero.
* Starts machine and reads instrument dials to determine dimensions of gear, and compares readings to specifications.
* Measures profile and surface dimensions of gear, using optical comparator and micrometer, vernier gauges, and sine blocks.
* Measures surface finish, using profilameter.
* Measures material hardness, using hardness gauge.
* Recommends corrections on gear forming machine setup to eliminate defects.
* Maintains records of gears tested and measured.
* May lay out and mark drill holes, keyways, and gear tooth profile on blanks, using measuring devices and marking tools.
* May check gear-forming machine setup, using master gears.
Industry:Professional careers
A professional who sets up and operates gear inspecting and sorting machines to measure gears for deviations from dimensional specifications and to test mesh of gears with master (inspection) gears. Respnsibilities include:
* Positions gear in spindle and moves controls to engage it with master gear.
* Rotates gear and observes mating with master gear and listens for sounds indicating defective gear.
* Marks gear with ink or attaches tracing stylus to gear to locate and highlight wear points.
* Color codes gears to enable other workers to match gears having similar deviations.
* May file burrs or highspots on gears.
* May test mesh and accuracy of finished transmission gears and be designated Gear Roller.
Industry:Professional careers
A professional who sets up and operates gear inspecting and sorting machines to measure gears for deviations from dimensional specifications and to test mesh of gears with master (inspection) gears. Respnsibilities include:
* Positions gear in spindle and moves controls to engage it with master gear.
* Rotates gear and observes mating with master gear and listens for sounds indicating defective gear.
* Marks gear with ink or attaches tracing stylus to gear to locate and highlight wear points.
* Color codes gears to enable other workers to match gears having similar deviations.
* May file burrs or highspots on gears.
* May test mesh and accuracy of finished transmission gears and be designated Gear Roller.
Industry:Professional careers
A professional who sets up and operates two or more types of gear-cutting and finishing machines, such as gear shapers, hobs, honers and lappers, and generators, to machine spline or gear teeth on metal blanks according to machining instructions and knowledge of gear types and gear machining. Respnsibilities include:
* Reads blueprint or job order to determine gear dimensions and specifications, fixture and cutter to use, and machine settings.
* Secures and positions cutters in toolhead, on spindle, or on arbor, and bolts fixtures on machine.
* Mounts gears, cams, or templates, or moves levers to set feed rates and rotation speeds of cutters and workpiece in relation to each other.
* Positions and secures workpiece to specified cutting angle on arbor, in chuck, or in fixture, using wrenches.
* Starts machine, turns valve handle, and directs flow of coolant against tool and workpiece.
* Verifies conformance to specifications, using micrometers, gear measuring wires, master gears, and special gear inspection equipment.
* May set cutting speeds and depth of stroke and cut for reciprocating cutters.
* May mount guides to control twisting motion of spindle for cutting helical gears.
* May compute gear dimensions and machine settings, applying knowledge of shop mathematics and gear design.
* May machine nonmetallic materials.
* May be required to have experience with custom or production work, or with particular material, product, or size, type, or trade name of machine.
Industry:Professional careers
