Gunnery Control Handle

Group 9: Senior DesignDeanna McKenzieMichael D. BrownWilliam ThorntonGunnery Control Handle

11Presentation OutlineIntroductionMechanical SystemComputer InterfacePrototype DesignProposed Improvements22Armored VehiclesVery expensive pieces of equipmentPilots cannot always be trained in the fieldNeed for simulators to help train driversThere are MANY types of vehicles; hence MANY different simulatorsIntro: Background

33Intro: Project ScopeDesign a generic simulator handleReduce WeightMake handle interchangeable

44Mech: Pro/E Assembly5

5Mech: Torsion Springs6

Counter-opposingConstant torsionDifficulty keeping equilibrium positionRecommend combination with cam system

6Mech: Gears and Potentiometers7Each shaft geared to potentiometerPots have large full angle (about 290)Gearing gives shafts small full angle (about 150) while still utilizing full angle of pots

7Center Body Layout84 Bearings2 Shafts4 Gears2 Potentiometers4 Torsion Springs1 Microcontroller

8Mech: M1A Gunners Handle92 Triggers2 contact switches1 button switch

9Mech: Handle Attachment10Wire ConnectionsHandle Connector

10Rapid Prototype: Equipment11Can print models up to 10 x 10 x 12Prints with ABSplus thermoplasticProduction gradePrinted from bottom upSoluble supports during printingAllows for more complex modeling

11Rapid Prototype: Center Body12

Material is layered ABS plasticWeaker than injection molded ABSYields quicker along print planesOnly to be used as prototype

12Rapid Prototype: M1A Gunners Handle13

Original handle No measurementsNo pictures

Handle design in Pro/EProduced from first hand experience and assorted pictures online

Final HandleABS printed plastic2 triggers(2 switches)1 button switch

http://www.armedforces-int.com/suppliers/afv-sim-ltd.html13Microcontroller14Arduino Uno MicrocontrollerOpen sourceThirteen digital pins plus ground pin6 analog to digital converters6 power source optionsUSB connectivity/powerCan be powered by adapter, USB or battery

14Microcontroller: Schematic15

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330330330330330330left handleright handle6 wires6 wires3 wires3 wires16Handle WiringWiring moves from the connector to switches inside the handle.

Connector allows for detachable handles

ProblemsSolutionsAccessibility to center shaft springs is inadequate.Handles will not always return to equilibriumDifficulty wiring systemLayered ABS is weak along plastic planesAllow for access through front of center bodyUse torsions springs as well as cam systemDesign for wiring pathways within bodyFabricate using injection molded ABS18Prototype: Key Problems and SolutionsPrototype: Cam System Proposal19All aspects of handles can be controlled by different cams

Cam defines equilibrium for each handle

Cams can be lined up next to one another for easy switching between handles

19Cost Analysis20PartQuantityPr ice ($)Total Cost ($)Shaft120.2520.25Bearings48.7234.88Microcontroller129.9529.95Potentiometers26.3512.70Pinion Gear213.0526.10 Gear213.5627.126-cond. Wire15 ft0.31/ft4.654-cond. wire15 ft0.37/ft5.55Torsion Springs87.8863.04Buttons66.9541.70Total $265.9420Acknowledgements21Lockheed Martin; ClientSteve Preston; Client ContactJeff Payne; Client ContactErnie Morrow; General Dynamics ContactDr. Rob Hovsapian; Senior Design ProfessorDr. Jonathan Clark; Faculty Advisor

21Questions?22

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