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.Copyright©2017,AstroDevices.Allrightsreserved. 1
MEADELightBridge:EncodersInstallation
Pleasemakesurethatyouhaveallthepartsincludedinthekit:
Listofparts:-thumbnutfortheazimuthpivot-spacer-azimuthpivotbolt-brassorplasticbushing-mountingplateforthepivotbolt-locknut-screwsforplate -threadedinsert(3/8”)andpush-inthreadedinsert(6.5mm)withanchorbolt-optionalwasherforthepivotbolt-azimuthtangentarmwiththeencodersensor-altitudeencodersensor-screwsforaltitudeencodersensor -magnetictapewithadhesivelayerforthealtitudebearing-encodercable-azimuthencoderdisk
Specifications:AzimuthEncoderresolution:311296stepsperrevolutionAltitudeEncoderresolution:952000stepsperrevolutionCurrentconsumption:25mAeach
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Copyright©2017,AstroDevices.Allrightsreserved.2
Pleasefamiliariseyourselfwithhowtheencoderswilllookinstalled(shownherewithouttheOTA):
Note:thephotoaboveshowsthebaseofLightBridge12”Deluxewithinstalledencodersandsomeadditionalwiringfordewheaters;thetangentarmshownisofpreviousrevisionwithouttensioningspring.Pleasenotetheplacementofthealtitudesensorandtheorientation
AzimuthencoderinstallationPleaseremovetheOTAfromthebase.Thenremovetheazimuthtensionadjustmentknob.
Youwillseeametalinsert.Youcaneitherkeepitoryoucanremoveitareplaceitwiththebushing
.Copyright©2017,AstroDevices.Allrightsreserved. 3
supplied.Pleasenotethatthebushingsuppliediseitherplasticorabrassbushing.Incaseyouwanttoreplacethebushingstartwithremovingthemetalinsert:
Theninsertthebushingprovidedandpushitintothehole:
Nowyouneedthewasherandthepivotbolt:
Putthewasheronthebushing:
Copyright©2017,AstroDevices.Allrightsreserved.4
Andinsertthepivotboltmakingsurethatyouscrewitintothethreadedinsertinthegroundboard:
Nowturnthebasearoundorputthewholebaseonaside:
Nowthreadtheplateontothepivotboltuntiltheplatecannotberotated:
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Nowyouneedadrillandasmall2mmorsodrillbit:
Drillthreeholes–foreachscrew:
Younowneedascrewdriverandthreescrewsformountingtheplate:
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Usethescrewdrivertofixtheplateinplace:
Nowputthebaseonitsfeetandusea½”spanner(or13mm)oranadjustablewrenchtoadjustthetensionsothetelescopedoesnotrotatefreely(asyouwillnotbeabletoadjustthetensionduetothelackoftheknob):
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Nowturnthebaseonitssideandlockthepivotboltwiththelocknut:
Preparethetangentarm(10),thumbnut(1)spacer(2)andazimuthencoderring(15):
Feedthepivotboltthroughtangentarm’sballbearing:
Putthespaceronthebolt:
Copyright©2017,AstroDevices.Allrightsreserved.8
NOTE:Thetangentarmshouldbeinstalledfacingtheboardbetweensidewallsofthebaseofthetelescope.Puttheencoderringnow:
followedbythethumbnutandtightenit:
Youwillneedapencilforthenextstep:
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Markthemiddleofthetangentarm’sslot:
Nowyouwillneedadrillandadrillbitofthefollowingsize:
- 6mmor¼”forthealuminiuminsert- 9.5mmor3/8”forthebrassthreadedinsert
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Drillaholeatthemarkedspot,removethewoodchips:
Threadtheinsertintothehole(usearubberhummerincaseofusingthealuminiuminserttopushitintothehole):
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Movethetangentarmuntiltheslotisoverthethreadedinsertandthreadtheanchorboltin:
AltitudeencoderinstallationItisimportanttofollowthestepsdescribedhereintheexactorderitisdescribed.Thealtitudeencodersensor(11)shouldbeinstalledontheinsideofthesidewalloftherockerboxthatdoesnothavethealtitudebearingtensionadjustment:
Youwillneedtousethesuppliedtemplatetomarktheplacementofthealtitudeencodersensor.Itisbesttouseaflashlightoranotherlightsourcetoplacethetemplatepreciselyontheinsideofthesidewall:
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Theoutercircleofthetemplatemustbealignedwiththecircularlineofthewall(notthefeltlining):
Marktwomountingholesforthesensor–herethetwoleftholesareused:
Nowthemagnetictape(13)ofthealtitudeencoderneedstobeinstalled.YouwillneedIsopropylalcoholorsimilarsolventtocleanthesurfaceofthealtitudebearing:
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Useapapertoweltocleanthepartofthealtitudebearingmarkedwitharedarrowinthephotobelow:
PuttheOTAonthebaseoncethesurfaceisclean:
Locatethebottomholeofthemarkedpositionofmountingholeofthealtitudesensoranduseapenciltodrawahorizontallineonthebearingalignedwiththemarkedpositionorslightlybelow:
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Themagnetictapeisaveryspecialtapewithmultiplemagneticpolesmagnetisedwithahighdegreeofprecision.Thetapehasastainlesssteelbackingwithathinlayerofadhesive.Peeltheprotectivetapeofthemagnetictapeononeend:
RemovetheOTAfromtherockerbox.Themagnetictapeneedstobegluedverycarefullyontheinsideofthealtitudebearingstartingfromthelineyoumarkedinthepreviousstep.Forbestresultstheendsofthetapeshouldbegluedwithanepoxyglue(theadhesiveneedstobescrapedoffinthatcase).Hereonlytheadhesiveofthemagnetictapeisused.Useasoftclothtoputpressureonthetapewhileitisgluedinplacemakingsureitisfullyadheredtothesurfaceofthebearing:
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Usethesmalldrillbittodrillsmallholesforthemountingscrewsmakingsuretheydonotgothroughtheholeboard:
Usethescrewsprovidedtoinstallthealtitudeencodersensor.Donottightenthemjustyet:
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Thenextstepisveryimportant.Thesensor(asmallblackrectangleonthePCBmarkedwitharedarrowinthephotobelow)shouldideallybeplaceat0.5mmfromthemagnetic tape– it canbesmallerbut it shouldnot touch thetape.
PuttheOTAontotherockerboxandcheckthegapbetweentheactualsensorandthemagnetictape.Adjusttheplacementofthesensoruntilthegapis0.5mmorlessandtightenthescrews:
DONE!NotplugtheencodercableintothejacksoftheencodersandconnectittotheDSCandenjoy!