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