Challenge 1

Challenge 1: Extinguishing the candle

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We chose to work backwards, beginning by creating a simple robot that will extinguish a candle when pointed in the correct direction. We chose to use shaving cream as our method of extinguishing. This decision was made for a number of reasons:

The goal of the contest is to create a product which might in the future be modified for use in warehouses and homes. The process necessary to aim and shoot a can of shaving cream is similar to that which would be used with a fire extinguisher.
Shaving cream smothers well, and isn't flammable
It's fun!

Step One: Trigger-Pressing Mechanism

We need to build a mechanism with enough torque to dispense the shaving cream. After experimenting with different gear ratios, we decide on a 27-to-1 ratio. A gear rack acts as the pushing mechanism.

Step 2: Vehicle

We build a vehicle to hold the Handy Board, the shaving cream, and the gear train. A simple base allows for minimal weight while providing sufficient room for further navigational tools to be added. A light-weight box surrounding the shaving cream will hold it in place and provide a base for the gear train and motor. The motor is built into the wall, which anchors it firmly and prevents slipping during operation. The axels of the gear train protrude through the walls of the box to guarantee stability above the shaving cream.

Step 3: Testing!

We test the developing robot on a candle. We discover that shaking the shaving cream and cleaning the spout before operation is vital for proper operation. However, further adjustments must be made to ensure accuracy in its aim for extinguishing the flame.

Last updated January 25, 2000