Hacky Sack Launch Mechanism By: Zachary Cowherd Wen Luu Keiichi McGuire.
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Transcript of Hacky Sack Launch Mechanism By: Zachary Cowherd Wen Luu Keiichi McGuire.
Overview
Problem Definition– Introduction– Constraints– Criteria
Approach– Preliminary Ideas– Refinement– Implementation
Overview Continued
Results Suggested Improvements Conclusions
– Key Criteria/Constraints– Final Design– Competition Performance– Improvements
Problem Identification
Introduction
The objective for this project is to create a Parabolic Hacky Sack Launch Mechanism (PHSLM) that will go down a slope and launch a hacky sack at the end aimed at a target 20ft away.
Problem Identification
Criteria
We have to build a device that can:– Traverse a ramp– Weigh a certain amount – Throw a hacky sack– Size of the device
Problem Identification
Constraints
The ramp will be 8ft in length It can weigh no more than 10lbs. The hacky sack has to be thrown 20ft. It must fit in a box 18 in3
Approach
Preliminary Ideas
Design 1: A hinged arm would be propelled up and forwards by compressed springs. the arm would be pushed down and the
ignition ram would lock into it
Preliminary Ideas (con’t)
Design 2: the ignition system would be the same but this would launch out of a tube by compressing springs below the
launcher and locking them in place with the ignition rod
Preliminary Ideas (con’t)
Design 3: A rat trap style launcher by using would coils that
would fling a arm with the hacky sack in it
Pros / Cons
Design 1– Too top heavy – Easily built
Design 2– Not accurate– Very consistent
Design 3– Similar to design 1 – Much better ignition design
Refinement
Liked the release idea of design 3 instead of just releasing it, it would also hit a
vertical stopper, countering the slope of triangle
Approach
Implementation
Final Design: – rat trap design– arm hits vertical stopper – release pin as trigger (simple)– heavy wheels to keep device upright
Results
First Trial:18.92 feet from target Second Trial: 7.00 feet from target FOM Average: 78.64 Performance Grade: 92/100 Design Quality: 78 9th place out of 31
Suggested Improvements
More time to test and improve launcher Use better materials to build launcher More time to design release mechanism
Conclusions
Key Criteria– Size of the device– Weight of the device
Key Constraints– No larger than 18 in3
– Can weigh no more than 10 lbs.
Conclusion (con’t)
Final Design:– a “mouse-trap” style design– 4 “heavy” wheels to keep device right-side up– scoop shaped hacky-sack holder– vertical piece to counter-act the slope of ramp
Conclusion (con’t)
Competition Performance– Group did well considering over night rebuild
(9/31)– Figure of Merit (FOM): Average of 78.64– Closest trial was 7.0 feet from target
Acknowledgements
Home Depot – Knowledge of hardware
Matt Conners and Chris Dockstader– Lending tools and materials