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✁TECHNICAL INFORMATION PAGESCUT OUT AND KEEPHeidenhain absolute encoders guarantee positioningIt is fifteen years sinceHewlett-Packard’s Indigodivision introduced digitaloffset colour productionprinting to the world.Since then HP Indigohas achievedconsistent growth anda market-leadingposition worldwide.Now the company hasunveiled its newWS6000 digital printingpress, which benefitsfrom Heidenhain absoluteencoder technology.Designed to delivermedium-run colour print jobsprofitably by optimising printefficiency, the WS6000 featuresControl Techniques’ Digitax STIntelligent servo drives. ControlTechniques, in turn, specifiedHeidenhain’s single- and multiturnabsolute rotary encoders forfeedback of speed andposition. Accuracy ofregistration is the definingfactor when printing colourseparations onto a substrate,and this depends on precisemeasurement of the speedand absolute position of theWS6000’s printing drum. TheHeidenhain ECI 1319 singleturninductive absolute encoderprovides 19-bit resolution(524,288 counts per revolution),which allows fast sample timesto be set in the Digitax STcontroller for precise speedcontrol of the winders andprinting drum, together withaccurate position control.For the ‘active dancer’adjustment that tensions theweb on which the substrateprogresses through the printingpress, Heidenhain EQI 1331multi-turn absolute encodersprovide 12 bit turns (4096revolutions) and 19 bit (524,288)positions within a revolution.Both the ECI 1319 and EQI1331 encoders incorporate theEnDat serial data interface thatprovides a digital link to thedrive. This helps with driveperformance and low-costcabling solutions.Giant telescope movedwith extreme precisionAfter seven years of construction, the largest opticaltelescope in the northern hemisphere, the GranTelescopio Canarias (GranTeCan), will focus fourmillion times more accurately than the human eye andwill enable astronomers to detect more details than everbefore.This involves Heidenhain ERA 780C angle encoderspositioning the giant telescope with unrivalled precision.The 105 million euro system rotates about two axes –the elevation (vertical motion) and the azimuth(horizontal motion).The angle of the azimuth axis is measured over adiameter of some 15 m, which requires a scale tape witha length of 48.48 m, while 1,212,000 lines with a scaletapegrating period of 40 microns are available for theangular measurement. Thanks to the high quality of themeasuring signals, each grating period can beinterpolated by a factor of 4096 to provide 10-nanometermeasuring steps for positioning the azimuth axis. Thisresults in an angular resolution of 0.0003 arc seconds.Calibration and compensation of systematic errorsbring a system accuracy of 0.06 arc seconds over13.2°.The positive effect of linear encodersThe thermal behaviour of machinetools is an important consideration,given that conditions duringproduction are constantly subject tochange. This is why there is a differencein machining accuracy between usingmachines equipped with linearencoders, which fully compensate forthermal expansion of ballscrews, andthose that don’t.With this in mind, Heidenhain isactively promoting the use of linearencoders – such as the LC100 series, toprovide absolute position measurementfor measuring lengths up to 4.2m - pointingout that‘machinetools notfitted withlinearreasonable. And the value of theresultant benefits in terms ofproductivity, accuracy, profitability andcompetitive edge are easily realised.In practice, changes in ballscrewlength as a result of thermal drift,typically 100 microns/m within 20 mins,can introduce significant errors tocomponents produced on a machineequipped only with rotary encoders. Thisis because changes in the drivingmechanics due to wear or temperatureincrease resulting from highencoders for positioning may notbe accurate enough for the increasinglyhigh performance demands made uponthem’. According to Heidenhain, whenviewed against the overall cost of amajor capital investment in a machinetool, the additional cost of specifyingprecision linear encoders is veryspeeds and rapid acceleration are notcompensated for in a semi-closed loopmode of operation.If, however, a linear encoder is usedfor measurement of the slide position,potential errors in the transfer elementsof the machine have a lesser influenceon the accuracy of the positionmeasurement.18More details: Write in 180 on the free information card
ENGINEERING LITERATURENew guides and brochures for your bookshelfInnovative automation, motioncontrol and electronic productsIndustrial automation, motioncontrol and electroniccomponent specialist, IMOPrecision Controls haslaunched its new short formcatalogue, covering a wide rangeof innovative new products in thekey market sectors of processcontrol, panel building, safety,drive systems and electronics.Addressing the needs ofOEMs, panel builders and endusers, the new short formcatalogue includes some of thebest selling products amongIMO’s 15,000 product lines, themajority of which are backed bythree-year or, in the case ofdrives, five-year guarantees.Extending to 53 pages andincluding 27 product categories,the catalogue is available in bothhardback and CD formats. TheCD (IMO Resources) is the morecomprehensive of the two,providing additional cataloguesfor DIN rail terminals, pushbuttons, relays, sensing andswitch products, and terminalblocks, plus user trainingmanuals, configuration andprogramming software, and alsofull technical datasheets on theentire IMO product range.Included in the new productsappearing in the catalogue for thefirst time are the i 3 (iCube)integrated logic controller, JaguarVXR inverters, C4 motor circuitbreakers, iCon signal conditionersHIGHLIGHTOur featuredpublication ofthe monthand DIN rail power supplies. Allof these products are designed toprovide high levels of flexibilityand performance.Want a copy? .........Enter K194 on the card2009 RS CatalogueRS ComponentsRS Components has launched itsnew 4-part catalogue. Used byindustrial engineers nationwide itcontains over 160,000 products,of which all are available fromstock, with free next day delivery.Want a copy? ..........Enter K195 on the cardDC motorsParvaluxParvalux is pleased to announcethe release of a new catalogue forits 2009 range of DC brushedpermanent magnet motors andgearboxes with an extendedchoice of ratios.Want a copy? ..........Enter K196 on the cardHydraulic FluidsBFPAAnybody involved with hydraulicsshould have a copy of ‘HydraulicFluids – A Practical Guide’ in theirtechnical library. Priced at just£39 the new book is an extremelyuseful guide.More info? .............Enter K197 on the cardThis month on the web...Chain selectionRenold ChainAmongst the most populardownloads from Renold Chain’sweb site is a free chain-selector,that takes all the hit-and-miss outof specifying the right size andtype of chain. The company hasalso produced an excellenttroubleshooter guide in PDFformat.www.renold.comPrecision bearingsBarden CorporationThe Barden Corporation haslaunched a brand new websitethat offers easier navigation,improved functionality, as well aslots of useful technicalinformation on the company’scomprehensive range of superprecision bearings and custombearing solutions.www.bardenbearings.co.ukLinear motionHepcoMotionThe HepcoMotion website hasalways featured a first rate CADsection, providing swift access to3D models, specifications andperformance data. And nowHepcoMotion has also added 2DCAD acknowledging the fact thatmany of its customers still utilisepackages such as AutoCAD LT.www.hepcomotion.comNovember 2008 • INDUSTRIAL TECHNOLOGYMore details: Write in 19019
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