Scratch Robots

Scratch Robots

Catapult

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Catapult – Step 1

Parts:

- 8.5” x 11” cardboard- 4”x6” Foamie- 1 Starbucks straw- 4 Starbucks coffee

stirrer sticks- Paper clip- 8” string

Tools:

- Scissors- Ruler- Tape- Hot Glue Gun



Catapult – Step 2

Base:

Cut the cardboard base and strengthen it by hot gluing coffee stirrer sticks.

Each line on the green mat is 1” square.

Therefore the base is 3” x 5”.



Catapult – Step 3

Arm parts and rubber band stops.



Catapult – Step 4

Base rubber band stops:

Hot glue foam strips on the middle coffee stirrer stick on the base.



Catapult – Step 5

Arm-1:

1. Cut the rubber band strips and hinge parts.

2. Hot glue half of hinge on arm stick.



Catapult – Step 6

Arm-2:

Hot glue the 2nd half of the hinge on the arm.

Measure and mark the middle of the base.



Catapult – Step 7

Arm-3:

Hot glue arm hinges on the base.



Catapult – Step 8

Arm-4:

Hot glue the rubber band strip on the arm.

It should be positioned so it aligns with the rubber band strip on the base coffee stirrer stick



Catapult – Step 9

Rubber bands.

1. One rubber band will act as the arm spring.

2. The other rubber band will act as the arm stop to control the throwing trajectory.

3. You can twist the rubber bands to control the spring strength and arm stop position.



Catapult – Step 10

Hand-1:

Collect these parts to start the catapult hand (or bucket).



Catapult – Step 11

Hand-2:

1. Cut a slit in the top of the hand

2. Overlap the slit sides to make a pocket. Hot glue.

3. Hot glue the foam piece so it wraps around the straw.

4. Slip the straw hand over the coffee stirrer stick arm. Tape it to the arm.

5. Experiment with arm/hand length.

1) 2)

3)



Catapult – Finished!!!!!!

Catapult Trigger

1. Attach a string to pull the paper clip and release the catapult arm.

2. Hold the catapult arm down to the middle coffee stirrer stick with paper clip that has been opened.

3. Tape the base coffee stirrer sticks to a platform. This will keep the catapult stable.

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