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Cruise control | mechanism controlled driver provided resistance pressure accelerator pedal vehicle reached desired speed.teetors idea dashboard speed selector mechanism connected driveshaft device able push gas pedal patented .added speed lock capability maintained cars speed driver tapped brake pedal turned system.a u.s. patent const... |
Cruise control | despite patents riley exline subsequent patent holders able collect royalties cruise control inventions.the first car teetors speedostat system chrysler imperial called autopilot using speed control dial dashboard.system calculated ground speed rotating speedometercable used bidirectional screwdrive electric motor vary... |
Cruise control | amc gm chrysler priced option ford charged .in late integrated circuit wisners design electronic cruise control finally commercially developed motorola mc automotive speed control processor cmos.advantage electronic speed control mechanical predecessor could integrated electronic accident avoidance engine management sy... |
Cruise control | cruise control often includes memory feature resume set speed braking coast feature reduce set speed without braking.cruise control engaged throttle still used accelerate car pedal released car slow reaches previously set speed.on latest vehicles fitted electronic throttle control cruise control integrated vehicles eng... |
Cruise control | therefore cruise control benefit motorwayhighway speeds top gear used virtually time.speed limiter function however problem.advantages disadvantages advantages cruise control includeit useful long drives reducing driver fatigue improving comfort allowing positioning changes safely across highways sparsely populated roa... |
Cruise control | adaptive cruise control modern vehicles systems adaptive cruise control acc general term meaning improved cruise control.improvements automatic braking dynamic setspeed type controls.automatic braking type automatic braking type use either single combination sensors radar lidar camera allow vehicle keep pace car follow... |
Cruise control | system cannot detect completely stationary vehicles pedestrians unless equipped camera system driver must always pay attention.vehicles adaptive cruise control considered level autonomous car defined sae international.see also pid controller fundamental control concept used car cruise control references external links ... |
Cruise control | automotive control systems.cambridge university press.pp.–.isbn .cruise control block diagramoverview intelligent vehicle safety systemsintelligent transport systemspreventive safety applications technologiescruise uncontrol driver sets cruise control vehicle slips backseat nap snopes.com |
History of numerical control | early servomechanisms rapidly augmented analog digital computers creating modern cnc machine tools revolutionized machining processes.earlier forms automation cams automation machine tool control began th century cams played machine tool way cams long playing musical boxes operating elaborate cuckoo clocks.thomas blanc... |
History of numerical control | developments potential convergence automation machine tool control starting century convergence happen many decades later.tracer control application hydraulics cambased automation resulted tracing machines used stylus trace template enormous pratt whitney keller machine could copy templates several feet across.another ... |
History of numerical control | servos synchros one barrier complete automation required tolerances machining process routinely order thousandths inch.although connecting sort control storage device like punched cards easy ensuring controls moved correct position required accuracy another issue.movement tool resulted varying forces controls would mea... |
History of numerical control | using variety mechanical electrical systems output synchros could read ensure proper movement occurred words forming closedloop control system.the first serious suggestion synchros could used machining control made ernst f. w. alexanderson swedish immigrant u.s. working general electric ge.alexanderson worked problem t... |
History of numerical control | parsons corp. sikorsky birth nc generally credited john t. parsons frank l. stulen working parsons corp. traverse city michigan.contribution jointly awarded national medal technology revolutionizing production cars airplanes numerical controls machines.in parsons told helicopters going next big thing former head ford t... |
History of numerical control | parsons fill dots french curve generate outline.wooden jig built form outside outline pieces wood forming stringer placed pressure inside jig formed proper curve.series trusswork members assembled inside outline provide strength.after setting production disused furniture factory ramping production one blades failed tra... |
History of numerical control | parsons suggested new method attaching stringers directly spar using adhesives never tried aircraft design.that development led parsons consider possibility using stamped metal stringers instead wood.would much stronger far easier make well would eliminate complex layup glue screw fastening wood.duplicating metal punch... |
History of numerical control | conversation stulen concluded parsons didnt really know talking about.parsons realized stulen reached conclusion hired spot.stulen started work april hired three new engineers join him.stulens brother worked curtis wright propeller mentioned using punched card calculators engineering calculations.stulen decided adopt i... |
History of numerical control | cut points would produce relatively accurate cutout stringer.could cut tool steel easily filed smooth template stamping metal stringers.stullen problem making program used produce large tables numbers would taken onto machine floor.one operator read numbers charts two operators one x axes.pair numbers operators would m... |
History of numerical control | laborintensive prototype todays .axis machining twoandahalfaxis machining.punch cards first tries nc point parsons conceived fully automated machine tool.enough points outline manual working would needed clean up.however manual operation time saved part closely match outline offset time needed move controls. |
History of numerical control | machines inputs attached directly card reader delay associated manual errors would removed number points could dramatically increased.machine could repeatedly punch perfectly accurate templates command.time parsons funds develop ideas.when one parsonss salesmen visit wright field told problems newly formed us air force... |
History of numerical control | decided use axis template copiers produce stringers cutting metal template already ordered expensive cutting machine.parsons notednow picture situation minute.lockheed contracted design machine make wings.machine five axes cutter movement tracer controlled using template.nobody using method making templates imagine cha... |
History of numerical control | air force arranged funding parsons build machines own.early work snyder machine tool corp proved system directly driving controls motors failed give accuracy needed set machine perfectly smooth cut.since mechanical controls respond linear fashion couldnt simply drive given amount power differing forces meant amount pow... |
History of numerical control | first commercial numerically controlled machine arma corporation done much defense work rangefinders war announced first commercial numerically controlled lathe developed dr. f. w. cunningham.armas first automated lathe made announced .parsons corp. mit impossible problem solve would require sort feedback system like s... |
History of numerical control | naturally suited technological transfer prototype parsonss automated bythenumbers machine.the mit team led william pease assisted james mcdonough.quickly concluded parsonss design could greatly improved machine simply cut points b instead moved smoothly points would make perfectly smooth cut could many fewer points – m... |
History of numerical control | parsons would later comment never dreamed anybody reputable mit would deliberately go ahead take project.spite development handed mit parsons filed patent motor controlled apparatus positioning machine tool may sparking filing mit numerical control servosystem august .parsons received us patent january company sold exc... |
History of numerical control | three cabinets contained motor controllers one controller motor two digital reading system.unlike parsonss original punched card design mit design used standard track punch tape input.three tracks used control different axes machine four encoded various control information.tape read cabinet also housed six relaybased h... |
History of numerical control | instance points far apart output would pulses every clock cycle whereas closely spaced points would generate pulses multiple clock cycles.pulses sent summing register motor controllers counting number pulses every time received.summing registers connected digital analog converter increased power motors count registers ... |
History of numerical control | inch movement cutting head.programmer could control speed cut selecting points closer together slow movements apart rapid ones.the system publicly demonstrated september appearing months scientific american.mits system outstanding success technical measure quickly making complex cut extremely high accuracy could easily... |
History of numerical control | .dollars.system used mill number oneoff designs various aviation firms order study potential economic impact.proliferation nc air force numeric control milling machine projects formally concluded development continued giddings lewis machine tool co. locations.many mit team left form concord controls commercial nc compa... |
History of numerical control | numericord similar mit design replaced punch tape magnetic tape reader general electric working on.tape contained number signals different phases directly encoded angle various controls.tape played constant speed controller set half selsyn encoded angles remote side attached machine controls.designs still encoded paper... |
History of numerical control | developed produce highly accurate dies aircraft skinning press numericord nc went operation gls plant fond du lac wi .monarch machine tool also developed numerical controlled lathe starting .demonstrated machine chicago machine tool show predecessor todays imts along number vendors punched card paper tape machines eith... |
History of numerical control | forces production noble claims whole point far air force concerned moving process highly unionized factory floor nonunionized white collar design office.cultural context early second red scare widespread fear bomber gap domestic subversion sheds light interpretation.strongly feared west would lose defense production ra... |
History of numerical control | development whirlwind mits realtime computer john runyon coded number subroutines produce tapes computer control.users could enter list points speeds program would calculate points needed automatically generate punch tape.one instance process reduced time required produce instruction list mill part hours minutes.led pr... |
History of numerical control | chose name unit computer applications group feeling word application fit vision general purpose machines could programmed fill many roles.starting september ross pople outlined language machine control based points lines developing several years apt programming language.aircraft industries association aia air material ... |
History of numerical control | hanratty went develop micr magnetic ink characters used cheque processing moving general motors work groundbreaking dac cad system.apt soon extended include real curves daptii.release public domain mit reduced focus nc moved cad experiments.apt development picked aia san diego illinois institute technology research.wor... |
History of numerical control | cadcam meets cnc servomechanisms lab process developing first mill mits mechanical engineering department dropped requirement undergraduates take courses drawing.instructors formerly teaching programs merged design division informal discussion computerized design started.meanwhile electronic systems laboratory newly re... |
History of numerical control | proved far little ambitious program mind lot money.newly graduated engineers making perhaps per month time.augment air forces commitment ross replayed success apt development model.aed cooperative program ultimately ran fiveyear period outside corporate staff deeply experienced design manpower loan companies .relocatin... |
History of numerical control | ross later estimated value almost six million dollars support aed development work systems research compilers.aed machine independent software engineering job extension algol standard publication algorithms research computer scientists.development started parallel ibm tx later enabled projects run various sites.enginee... |
History of numerical control | one part dac project direct conversion paper diagrams models converted apt commands cut milling machines.november design lid trunk moved paper sketch clay prototype first time.exception initial sketch designtoproduction loop closed.meanwhile mits offsite lincoln labs building computers test new transistorized designs.u... |
History of numerical control | development concepts led ivan sutherlands groundbreaking sketchpad program tx.sutherland moved university utah sketchpad work inspired mit graduates attempt first true cad system.electronic drafting machine edm sold control data known digigraphics lockheed used build production parts c galaxy first example endtoend cad... |
History of numerical control | pdps data general nova computers common roles.introduction microprocessor reduced cost implementation today almost cnc machines use form microprocessor handle operations.the introduction lowercost cnc machines radically changed manufacturing industry.curves easy cut straight lines complex structures relatively easy pro... |
History of numerical control | cnc automation also allows flexibility way parts held manufacturing process time required changing machine produce different components.additionally cnc operators become demand automation becomes viable choice labor.during early western economies mired slow economic growth rising employment costs nc machines started be... |
History of numerical control | cycle quickly repeated japan taken leadership position u.s. sales dropping time.sitting position terms sales topten chart consisting entirely u.s. companies cincinnati milacron th place chart heavily dominated japanese firms.many researchers commented u.s. focus highend applications left uncompetitive situation economi... |
History of numerical control | early years development miti provided focused resources transfer technological knowhow.national efforts us focused integrated manufacturing historical perspective defence sector maintained.evolved later socalled machine tool crisis recognized number programs sought broaden transfer know domestic tool makers.air force s... |
History of numerical control | longterm coexistence less networked variants nc cnc explained fact individual firms tend stick whatever profitable time money trying alternatives limited.explains machine tool models tape storage media persist grandfathered fashion even state art advances.diy hobby personal cnc recent developments small scale cnc enabl... |
History of numerical control | derivations original emc software also led several proprietary low cost pc based programs notably turbocnc mach well embedded systems based proprietary hardware.availability pc based control programs led development diy cnc allowing hobbyists build using open source hardware designs.basic architecture allowed manufactu... |
History of numerical control | parallel evolution personal computers personal cnc roots emc pc based control evolved point replace larger conventional equipment many instances.personal computer personal cnc characterized equipment whose size capabilities original sales price make useful individuals intended operated directly end user often without p... |
History of numerical control | floppy disks usb flash drives local area networking replaced tapes degree especially larger environments highly integrated.the proliferation cnc led need new cnc standards encumbered licensing particular design concepts like proprietary extensions apt.number different standards proliferated time often based around vect... |
History of numerical control | met varying success.a recent advancement cnc interpreters support logical commands known parametric programming also known macro programming.parametric programs include device commands well control language similar basic.programmer make ifthenelse statements loops subprogram calls perform various arithmetic manipulate ... |
History of numerical control | another trends emergence widely published apis together aforementioned open data standards encourage ecosystem usergenerated apps mashups open commercial – words taking new culture app marketplaces began web development smartphone app development spreading cnc dnc factory automation systems networked cncdnc.mtconnect l... |
History of numerical control | automatic programming numerically controlled machine tools control engineering volume issue october pp.–.smid peter cnc programming handbook rd ed.new york industrial press isbn lccn .thomas richard a. history numerical control history role general electric company played development numerical control machine tools .va... |
History of numerical control | early servomechanisms rapidly augmented analog digital computers creating modern cnc machine tools revolutionized machining processes.earlier forms automation cams automation machine tool control began th century cams played machine tool way cams long playing musical boxes operating elaborate cuckoo clocks.thomas blanc... |
History of numerical control | developments potential convergence automation machine tool control starting century convergence happen many decades later.tracer control application hydraulics cambased automation resulted tracing machines used stylus trace template enormous pratt whitney keller machine could copy templates several feet across.another ... |
History of numerical control | servos synchros one barrier complete automation required tolerances machining process routinely order thousandths inch.although connecting sort control storage device like punched cards easy ensuring controls moved correct position required accuracy another issue.movement tool resulted varying forces controls would mea... |
History of numerical control | using variety mechanical electrical systems output synchros could read ensure proper movement occurred words forming closedloop control system.the first serious suggestion synchros could used machining control made ernst f. w. alexanderson swedish immigrant u.s. working general electric ge.alexanderson worked problem t... |
History of numerical control | parsons corp. sikorsky birth nc generally credited john t. parsons frank l. stulen working parsons corp. traverse city michigan.contribution jointly awarded national medal technology revolutionizing production cars airplanes numerical controls machines.in parsons told helicopters going next big thing former head ford t... |
History of numerical control | parsons fill dots french curve generate outline.wooden jig built form outside outline pieces wood forming stringer placed pressure inside jig formed proper curve.series trusswork members assembled inside outline provide strength.after setting production disused furniture factory ramping production one blades failed tra... |
History of numerical control | parsons suggested new method attaching stringers directly spar using adhesives never tried aircraft design.that development led parsons consider possibility using stamped metal stringers instead wood.would much stronger far easier make well would eliminate complex layup glue screw fastening wood.duplicating metal punch... |
History of numerical control | conversation stulen concluded parsons didnt really know talking about.parsons realized stulen reached conclusion hired spot.stulen started work april hired three new engineers join him.stulens brother worked curtis wright propeller mentioned using punched card calculators engineering calculations.stulen decided adopt i... |
History of numerical control | cut points would produce relatively accurate cutout stringer.could cut tool steel easily filed smooth template stamping metal stringers.stullen problem making program used produce large tables numbers would taken onto machine floor.one operator read numbers charts two operators one x axes.pair numbers operators would m... |
History of numerical control | laborintensive prototype todays .axis machining twoandahalfaxis machining.punch cards first tries nc point parsons conceived fully automated machine tool.enough points outline manual working would needed clean up.however manual operation time saved part closely match outline offset time needed move controls. |
History of numerical control | machines inputs attached directly card reader delay associated manual errors would removed number points could dramatically increased.machine could repeatedly punch perfectly accurate templates command.time parsons funds develop ideas.when one parsonss salesmen visit wright field told problems newly formed us air force... |
History of numerical control | decided use axis template copiers produce stringers cutting metal template already ordered expensive cutting machine.parsons notednow picture situation minute.lockheed contracted design machine make wings.machine five axes cutter movement tracer controlled using template.nobody using method making templates imagine cha... |
History of numerical control | air force arranged funding parsons build machines own.early work snyder machine tool corp proved system directly driving controls motors failed give accuracy needed set machine perfectly smooth cut.since mechanical controls respond linear fashion couldnt simply drive given amount power differing forces meant amount pow... |
History of numerical control | first commercial numerically controlled machine arma corporation done much defense work rangefinders war announced first commercial numerically controlled lathe developed dr. f. w. cunningham.armas first automated lathe made announced .parsons corp. mit impossible problem solve would require sort feedback system like s... |
History of numerical control | naturally suited technological transfer prototype parsonss automated bythenumbers machine.the mit team led william pease assisted james mcdonough.quickly concluded parsonss design could greatly improved machine simply cut points b instead moved smoothly points would make perfectly smooth cut could many fewer points – m... |
History of numerical control | parsons would later comment never dreamed anybody reputable mit would deliberately go ahead take project.spite development handed mit parsons filed patent motor controlled apparatus positioning machine tool may sparking filing mit numerical control servosystem august .parsons received us patent january company sold exc... |
History of numerical control | three cabinets contained motor controllers one controller motor two digital reading system.unlike parsonss original punched card design mit design used standard track punch tape input.three tracks used control different axes machine four encoded various control information.tape read cabinet also housed six relaybased h... |
History of numerical control | instance points far apart output would pulses every clock cycle whereas closely spaced points would generate pulses multiple clock cycles.pulses sent summing register motor controllers counting number pulses every time received.summing registers connected digital analog converter increased power motors count registers ... |
History of numerical control | inch movement cutting head.programmer could control speed cut selecting points closer together slow movements apart rapid ones.the system publicly demonstrated september appearing months scientific american.mits system outstanding success technical measure quickly making complex cut extremely high accuracy could easily... |
History of numerical control | .dollars.system used mill number oneoff designs various aviation firms order study potential economic impact.proliferation nc air force numeric control milling machine projects formally concluded development continued giddings lewis machine tool co. locations.many mit team left form concord controls commercial nc compa... |
History of numerical control | numericord similar mit design replaced punch tape magnetic tape reader general electric working on.tape contained number signals different phases directly encoded angle various controls.tape played constant speed controller set half selsyn encoded angles remote side attached machine controls.designs still encoded paper... |
History of numerical control | developed produce highly accurate dies aircraft skinning press numericord nc went operation gls plant fond du lac wi .monarch machine tool also developed numerical controlled lathe starting .demonstrated machine chicago machine tool show predecessor todays imts along number vendors punched card paper tape machines eith... |
History of numerical control | forces production noble claims whole point far air force concerned moving process highly unionized factory floor nonunionized white collar design office.cultural context early second red scare widespread fear bomber gap domestic subversion sheds light interpretation.strongly feared west would lose defense production ra... |
History of numerical control | development whirlwind mits realtime computer john runyon coded number subroutines produce tapes computer control.users could enter list points speeds program would calculate points needed automatically generate punch tape.one instance process reduced time required produce instruction list mill part hours minutes.led pr... |
History of numerical control | chose name unit computer applications group feeling word application fit vision general purpose machines could programmed fill many roles.starting september ross pople outlined language machine control based points lines developing several years apt programming language.aircraft industries association aia air material ... |
History of numerical control | hanratty went develop micr magnetic ink characters used cheque processing moving general motors work groundbreaking dac cad system.apt soon extended include real curves daptii.release public domain mit reduced focus nc moved cad experiments.apt development picked aia san diego illinois institute technology research.wor... |
History of numerical control | cadcam meets cnc servomechanisms lab process developing first mill mits mechanical engineering department dropped requirement undergraduates take courses drawing.instructors formerly teaching programs merged design division informal discussion computerized design started.meanwhile electronic systems laboratory newly re... |
History of numerical control | proved far little ambitious program mind lot money.newly graduated engineers making perhaps per month time.augment air forces commitment ross replayed success apt development model.aed cooperative program ultimately ran fiveyear period outside corporate staff deeply experienced design manpower loan companies .relocatin... |
History of numerical control | ross later estimated value almost six million dollars support aed development work systems research compilers.aed machine independent software engineering job extension algol standard publication algorithms research computer scientists.development started parallel ibm tx later enabled projects run various sites.enginee... |
History of numerical control | one part dac project direct conversion paper diagrams models converted apt commands cut milling machines.november design lid trunk moved paper sketch clay prototype first time.exception initial sketch designtoproduction loop closed.meanwhile mits offsite lincoln labs building computers test new transistorized designs.u... |
History of numerical control | development concepts led ivan sutherlands groundbreaking sketchpad program tx.sutherland moved university utah sketchpad work inspired mit graduates attempt first true cad system.electronic drafting machine edm sold control data known digigraphics lockheed used build production parts c galaxy first example endtoend cad... |
History of numerical control | pdps data general nova computers common roles.introduction microprocessor reduced cost implementation today almost cnc machines use form microprocessor handle operations.the introduction lowercost cnc machines radically changed manufacturing industry.curves easy cut straight lines complex structures relatively easy pro... |
History of numerical control | cnc automation also allows flexibility way parts held manufacturing process time required changing machine produce different components.additionally cnc operators become demand automation becomes viable choice labor.during early western economies mired slow economic growth rising employment costs nc machines started be... |
History of numerical control | cycle quickly repeated japan taken leadership position u.s. sales dropping time.sitting position terms sales topten chart consisting entirely u.s. companies cincinnati milacron th place chart heavily dominated japanese firms.many researchers commented u.s. focus highend applications left uncompetitive situation economi... |
History of numerical control | early years development miti provided focused resources transfer technological knowhow.national efforts us focused integrated manufacturing historical perspective defence sector maintained.evolved later socalled machine tool crisis recognized number programs sought broaden transfer know domestic tool makers.air force s... |
History of numerical control | longterm coexistence less networked variants nc cnc explained fact individual firms tend stick whatever profitable time money trying alternatives limited.explains machine tool models tape storage media persist grandfathered fashion even state art advances.diy hobby personal cnc recent developments small scale cnc enabl... |
History of numerical control | derivations original emc software also led several proprietary low cost pc based programs notably turbocnc mach well embedded systems based proprietary hardware.availability pc based control programs led development diy cnc allowing hobbyists build using open source hardware designs.basic architecture allowed manufactu... |
History of numerical control | parallel evolution personal computers personal cnc roots emc pc based control evolved point replace larger conventional equipment many instances.personal computer personal cnc characterized equipment whose size capabilities original sales price make useful individuals intended operated directly end user often without p... |
History of numerical control | floppy disks usb flash drives local area networking replaced tapes degree especially larger environments highly integrated.the proliferation cnc led need new cnc standards encumbered licensing particular design concepts like proprietary extensions apt.number different standards proliferated time often based around vect... |
History of numerical control | met varying success.a recent advancement cnc interpreters support logical commands known parametric programming also known macro programming.parametric programs include device commands well control language similar basic.programmer make ifthenelse statements loops subprogram calls perform various arithmetic manipulate ... |
History of numerical control | another trends emergence widely published apis together aforementioned open data standards encourage ecosystem usergenerated apps mashups open commercial – words taking new culture app marketplaces began web development smartphone app development spreading cnc dnc factory automation systems networked cncdnc.mtconnect l... |
History of numerical control | automatic programming numerically controlled machine tools control engineering volume issue october pp.–.smid peter cnc programming handbook rd ed.new york industrial press isbn lccn .thomas richard a. history numerical control history role general electric company played development numerical control machine tools .va... |
Old River Control Structure | regulates flow water mississippi atchafalaya river thereby preventing mississippi river changing course.completed complex built u.s. army corps engineers side channel mississippi known old river mississippis current channel atchafalaya basin former channel mississippi.old river control structure complex containing orig... |
Old River Control Structure | beginning th century mississippi river created small westward oxbow loop later called turnbulls bend near presentday angola louisiana.loop eventually intersected red river making downstream part red river distributary mississippi distributary came called atchafalaya river.in heyday steamboats along mississippi river ve... |
Old River Control Structure | upper portion turnbulls bend referred upper old river larger lower portion became known lower old river.at first lower old river would flow eastward mississippi locals began removing great raft natural log jam obstructing atchafalaya river.project finished .lower old river would flow eastward mississippi red river high... |
Old River Control Structure | increased water flow channel atchafalaya river worn deeper wider throughout early s.the u.s. army corps engineers measured amount water flowing mississippi river compared amount entering atchafalaya basin monitoring latitude flow latitude red river landing located five miles .km downstream old river.case latitude flow ... |
Old River Control Structure | researchers believe likelihood event increases year despite manmade artificial control efforts.if mississippi diverts main channel atchafalaya basin atchafalaya river would develop new delta south morgan city southern louisiana greatly reducing water flow present channel baton rouge new orleans adverse economic effects... |
Old River Control Structure | first two floodgates low sill control structure regulates routine flow waterway overbank control structure use mississippi exceeds banks.navigation channel lock also part original facility design.subsequent expansion created known old river control complex auxiliary structure became operational added reduce pressure or... |
Old River Control Structure | flow split based science rather based approximate flow allocation two rivers existed time construction.water diverted old river flows atchafalaya basin first entering red river continuing atchafalaya river gulf mexico bypassing baton rouge new orleans see diagram.the morganza floodway mississippi atchafalaya basin near... |
Electronic speed control | old river control structure.retrieved .may also provide reversing motor dynamic braking.miniature electronic speed controls used electrically powered radio controlled models.fullsize electric vehicles also systems control speed drive motors.function electronic speed control follows speed reference signal derived thrott... |
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