J.O. Combs Middle School
San Tan Valley, AZ, USA

Online Contest:
Erase A Chalkboard
Online Division I - Ages 11 - 14 (Middle School)
Team Leader: Ms. Yonge
Team Members: 12
Invitations: 0

    What we're studying:
    The Engineering Design Process: We're learning that practical limitations can sometimes effect design

    Our Team Leader's favorite quote:
    "Just Shim It" or "Try Hot Glue"

    Why we think we should win:
    We included a lot of electrical circuitry and had secondary steps and a fun theme

    Suggestion for next year's challenge:
    massage machine, paint a fingernail,
    put down toast in a toaster,

    Our Step List

    28 steps (numbers 6 & 15 have secondary steps)
    1) Team member turns on air pump
    2) Pump blows up balloon
    3) Inflated balloon knocks microscope off platform and it slides down conduit
    4) Microscope hits a bump switch (A)
    5) Microscope hits toggle light switch (B)
    6) (A)Bump switch extends solenoid (B) Light switch turns on the LED lights in scientist’s eyes
    7) Solenoid pushes metal ball down track
    8) Metal ball hits pendulum and detaches it from magnet
    9) Pendulum swings forward and hits billiard balls
    10) Billiard balls roll down ramp and hit dump truck
    11) Dump truck and billiards balls knock over video cassette tapes (A)
    12) Dump truck and billiards balls upset balance lever raising the ball platform (B)
    13) (B)billiard ball rolls down platform into tube and lands on power button
    14) (B)Power button turns on fan and the power adapter for second solenoid
    15) (A)video tapes fall on bump switch (B) fan causes tissue to blow upward like flames
    16) Bump switch extends solenoid
    17) Solenoid pushes billiards ball down ramp
    18) Ball falls through tube into basket
    19) Basket activates pulley which yanks stick free
    20) Stick releases boot allowing it to swing forward
    21) Boot hits power cord switch
    22) Switch turns on drill
    23) Drill turns axle on film reel
    24) Film reel spins belt
    25) Belt spins film reel with eraser hands
    26) Eraser hands spin and erase chalkboard

    Our Close-ups: Photos

    Our Close-ups: Favorite Step

    Our Close-ups: Task Completion

    Our Machine Explaination and Walkthrough

    Our Machine Run Videos

    Machine Run #1
    Machine Run #2