clutching at straws - online challenges · the clutch. when the clutch is engaged, the motion from...

Max Corpe 5606A Clutching at Straws Many people that we speak to at competitions wish there was a proper working VEX EDR Clutch; so I designed it. I have designed a new VEX EDR Clutch due to the significant inefficiencies of the original part. The original design meant that it was difficult to engage and disengage power transmission from your motors to your contraptions. The clutch I have designed takes reference from a cone clutch design – images detailing this will be included later in the document. This clutch unit would be used in a drive train. One side (the input) will be your motion from your motors and the other side (the output) will go to any contraption you want to power. With this design, a motor, servo or other would be able to rotate one of the two shafts to engage or disengage the clutch. When the clutch is engaged, the motion from your motors can come in on one side and go out the other side. However, when the clutch is disengaged the motion from the motors is not able to transfer through the clutch to the output, enabling the output side to spin freely. My clutch could be used in many ways, both as part of prototype for testing and part of a complete robot design. One example for either use would be a gearbox, allowing you to disengage the gears from your motor, meaning you can use one motor selectively for multiple jobs. This could enable you to swap your gear ratios to change the purpose of the motor quickly, freeing up the number of motors you can use. Another example could be a catapult trigger mechanism so you can disengage the motors to enable the string drum to spin freely without the motors slowing it down. Assembly internals - engaged Assembly internals with casing - engaged Example of clutch in a drive chain to engage and disengage the motors. It would be possible to place a gearbox on the other side of this

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Page 1: Clutching at Straws - Online Challenges · the clutch. When the clutch is engaged, the motion from your motors can come in on one side and go out the other side. However, when the

MaxCorpe 5606A

ClutchingatStrawsManypeoplethatwespeaktoatcompetitionswishtherewasaproperworkingVEXEDRClutch;soIdesignedit.IhavedesignedanewVEXEDRClutchduetothesignificantinefficienciesoftheoriginalpart.Theoriginaldesignmeantthatitwasdifficulttoengageanddisengagepowertransmissionfrom

yourmotorstoyourcontraptions.TheclutchIhavedesignedtakesreferencefromaconeclutchdesign–imagesdetailingthiswillbeincludedlaterinthedocument.

Thisclutchunitwouldbeusedinadrivetrain.Oneside(theinput)willbeyourmotionfromyourmotorsandtheotherside(theoutput)willgotoanycontraptionyouwanttopower.Withthisdesign,amotor,servoorotherwouldbeabletorotateoneofthetwoshaftstoengageordisengagetheclutch.Whentheclutchisengaged,themotionfromyourmotorscancomeinononesideandgoouttheotherside.However,whentheclutchisdisengagedthemotionfromthemotorsisnotabletotransferthroughtheclutchtotheoutput,enablingtheoutputsidetospinfreely.

Myclutchcouldbeusedinmanyways,bothaspartofprototypefortestingandpartofacompleterobotdesign.Oneexampleforeitherusewouldbeagearbox,allowingyoutodisengagethegears

fromyourmotor,meaningyoucanuseonemotorselectivelyformultiplejobs.Thiscouldenableyoutoswapyourgearratiostochangethepurposeofthemotorquickly,freeingupthenumberofmotorsyoucanuse.Anotherexamplecouldbeacatapulttriggermechanismsoyoucandisengagethemotorstoenablethestringdrumtospinfreelywithoutthemotorsslowingitdown.

Assemblyinternals-engaged Assemblyinternalswithcasing-engaged

Exampleofclutchinadrivechaintoengageanddisengagethemotors.Itwouldbepossibletoplaceagearboxontheothersideofthis

Page 2: Clutching at Straws - Online Challenges · the clutch. When the clutch is engaged, the motion from your motors can come in on one side and go out the other side. However, when the

MaxCorpe 5606A

TodesignthispartIusedAutodeskInventorProfessional2016,andIusedawidevarietyoffeaturesandtechniques.Thesefeautresinclude:

§ MeasuringTool.Thishelpedtomeasurethepre-existingVEXpartstoensurecompatibilitywiththepartIwasdesigning

§ CoilTool.ThiswasusedtocreatethespringandthenusingDrivenConstraintstocontractandexpandthespring

§ MirrorCommand.Thiscommand(withRemoveOriginalenabled)wasusedtocreatethesecondsideoftheoutercasing

§ RectanglePatternTool.Thiswasusedtocopyidenticalfeaturestodifferentplacesonthepart(e.g.thescrewholesontheoutercasing)

ThemaindifficultyIhadwiththisprojectwasnottheclutchitself,butratherthetriggermechanism.Iovercamethisissuebyresearchingrealclutchdesignsandusingthemaguidetocreateasimpleandcompacttriggermechanism.TheissuesthatIfacedwiththisproblemcausedmetoconsidermultipledesignsbeforeIreachedmyfinalproduct.

Ilearnedmanythingsintheprocessofdesigningthispart,fromadesign,engineering,andcompetitionperspective.IexpandedmyexistingknowledgeofCADwiththingslikehowDrivenDimensionsareused,andimprovedmygeneralefficiencywithusingAutodeskinventor.Idiscoveredthedetailsoftheinnerworkingsofaclutch,andthathavingtheabilitytouseonemotorformultipletasksisusefulincompetitionduetothemotornumberrestrcitions.AutodeskInventorhelpsmyschoolsRoboticsteambyhelpingussavetime,aswealwaysdesignourrobotonAutodeskInventorfirstbeforewebuildit.Thismeanswebuilditonceandwebuilditright.IwillcontinuetouseAutodeskInventorinthefuturebecauseitissomethingIreallyenjoyworkingwithandon,andonedayIhopetohaveacareerasaDesignEngineer.

Sectionviewofengagedclutch Sectionviewofdisengagedclutch

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