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Koalas' Balsa Wood Bridge

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DG

Darin Gray

Transcript

Problems

Stress & Strain

  • Plans did not fit on base of bridge
  • Sides bend outward with extra weight
  • the brain was unable to detect the code from EasyC
  • the motors would spin autonomously
  • the USB connector cable was not transmitting the code from EasyC to the brain
  • the brain was not working properly and we had to replace it
  • the current was too strong which caused a shortage in the battery pack
  • the remote was not corresponding to the transmitter which caused the motors not to turn
  • the channels were mixed up which resulted in the robot not receiving the signal
  • the robot was unusually, continuously spinning in circles even when the remote was off

Car

Tube Car

  • Used to model final car that will hold bricks
  • Built with series circuit

Jobs

Koalas' Balsa Wood Bridge

Bridge Kit

Bridge Model

  • index card alone: 4 hex nuts
  • final bridge: 14 hex nuts
  • Wren - sawing metal, assisting with building of car, and coding the program
  • Nick - building car
  • Sitara - final design of bridge, building bridge
  • Jade - building final bridge, prezi
  • Nina - building final bridge
  • Harshi - building final bridge, website
  • Understanding load
  • Understanding types of stress
  • Building mini tube car

Problems with Bridge & Car

  • bridge was flimsy
  • sides of index card would open outward with extra weight and this caused the Hex nuts to fall
  • To fix this we added a top part to the bridge
  • Car worked without any issues

Jade Rattanaxay, Nina Taurich, Nick Plummer, Harshil Shah, Wren Woods, Sitara Simons

Scratch

https://scratch.mit.edu/projects/115375823/

Building the Final Bridge

Final Bridge - Design

  • 18" wide
  • 4' 9" long
  • 6 planks under
  • (3) 13" vertical beams

  • 12 meters above water
  • medium strength concrete
  • Pratt Through Truss
  • Carbon steel components
  • $400,000
  • compression force did not exceed .40
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