特斯拉无叶涡轮泵制作方法.docx

特斯拉无叶涡轮泵制作方法.docx

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特斯拉无叶涡轮泵制作方法

特斯拉无叶涡轮泵制作方法

BuildingaTeslaTurbinefromharddriveplatters

PleasenotethatIamnotaPhysicistoramachinist（yet）.IhavebeeninterestedinNikolaTeslaforsometime,andIwaslookingforaprojecttogainsomeexperienceinthemachineshop.MyjobistoprovideLectureDemonstrations,somygoalwastoproduceateachingtoolratherthananefficientengine.

Forbackgroundmaterial,WikipediahasseveralgoodreviewarticlesaboutNikolaTesla,theTeslaTurbine,theBoundaryLayerEffect,andReynoldsNumber.

Disks

AtfirstItriedusingCDsbecauseoftheirlargesurfaceareas,buttheydidn'tholduptoowellunderthemillingmachine.Ialsohadastackofplattersfromoldanddefectiveharddrives,butIdidn'tknowifthesmallerdiameterdiskswouldworkaswell.

OneproblemIranintoisthatsomenewerharddrivesuseceramicdisksinsteadofmetal.They'restillcoatedwithmetal,butthey'rethinnerandacoupleplattersshatteredwhenItriedtomachinethem:

Myoriginalplanforthecenterholepatternhadsmallholes（forthreadedrodsandwashersforspacers）,aswellaslargeholes（forairvents）.

ThesecondsetofplattershadradialarcscutinthemsuchthattheinsideedgeoftheradialcutoutisclosetotheoutsidediameterofthespacersthatIremovedfromtheharddriveassemblies.

Theharddriveplatterswerestackedandclampedtoarotarytablebetweentwosheetsofscrapaluminiumbutthetopdisk（abovepicture）stilltooksomeextradamage.Therestoftheplatterslookmuchbetterthough（seethecompleterotorassemblybelow）.

Spacers

Idecidedtobelazyandusethespacersthatwerebetweentheplattersintheoriginalharddriveassembliesratherthanmachinemyown.Thisincreaseddistance（roughly.05"insteadof.012"）mayleadtoturblentflowratherthanlaminarflowbutwillbecloseenoughforthisproject.

Shaft

Withtheturbineplattersandspacerscomplete,Iturnedashaftfromroundstock.Theinsidediameterofboththeplattersandspacersis.98"whichisthediameterofthethicksectioninthemiddle.Ileftthewholelengthat.98"untilIknewthewidthofthechamberandtheinsidediameterofthebearings.Thewidepartis1.77"longwhichfitsinsidethe2"thickacrylicchamber.

Collars

Thecollarsareessentiallywiderversionsoftheplatterspacers.Theinsidediameterhastofitontheshaft,buttheycan'tbetootallsotheyblocktheventilationholesinthedisks.Also,theycan'tbetoowideortheywilltakeuptoomuchhorizontalspaceinsidethechamber.Imadeeachcollar.3"whichisenoughspacefora#10-32setscrewtoholdthem（andeverythingelse）inplace.

Bearings

Thebearingsandbrassfittingsweretheonlynewpartsinthisproject（everythingelsewasreusedfromscrapmaterials）.ThesemetricbearingswerepulledfromaboxofoldandusedbearingsandIhadtomachinetheshaftandsidepanelstofitthem.

RotorAssembly

Thereareelevenplattersandtenspacersheldtogetherbythetwocollars.TheharddriveplattersarehardtokeepcleansoIworegloveswhenassemblingtherotor.Thereshouldbeafairamountofpressurebetweenthetwocollarsorthediskswillrotateabouttheshaftinsteadofwithit.

Chamber

Themainchamberisanacrylicblockmachineddownto4.75"x4.75"x2".Thesquareblockwasmountedina4-jawlathechuck,drilled,andthenboredout.Thefinalcutoutisabout.07"largerthanthedisks.Theairinletistapedfora1/4"pipethreadandalloftheotherholesaretapedfor1/4-20socketheadcapscrews.

SidePanels

Thesidepanelsare.47"thickacrylicandhaveuntaped.25"holesforalignmenttothemainchamber.Thecenterholeis.6"witha.280"deepcounterboreforthebearing.ThebearingsaremetricsoIusedthe4-jawchuckandboringbaragaintotryforapressfitintothesidepanel.However,Imadethecounterboreafewthousandthstoobigwhichallowsthebearingtorotateinthesidepanel.

ManyotherTeslaTurbinesthatI'veseenonlinehavelargerventilationholesinthesides.Iwasgoingtocutthesameradialpatternfromthedisksinthesidepanels,butIdecidedthatwasn'tnecessaryafteratrialrunwithjustthe.6"hole.

Assembly

Thetwobrassfixturesarea5/16-45tubeunion（picture5）,anda1/4tube,1/4pipehosebarb（picture6）.

CompleteTurbine