How to Build a Homemade Rube Goldberg Machine

Part 1

Part 1 of 3:

Preparing for the Assignment or Competition

If you’re building a Rube Goldberg machine for a class or official competition, you will get a packet of information and rules. Before you plan or build your machine, read through this material carefully. While you read, identify the goal, requirements, and restrictions.

If the material is unclear, ask your teacher, parent, or an official to clarify.

If you don’t follow the rules, you may get a poor grade or be disqualified from the competition.^{[2] X Research source}

Rube Goldberg machines are complex structures that rely on chain reactions to execute one simple task. Before you design your machine, determine what you want the machine to do. If you are competing in a Rube Goldberg competition or completing an assignment for school, you may not have the freedom to choose this task. If can pick, consider some of the following options:

Open or close a door

Turn on a light

Turn off an alarm

Pour a bowl of cereal

Turn on a faucet

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Developing a zany, complex machine is not an easy task. Before you create your own Rube Goldberg machine, you may find it helpful to see some examples. While you should use these examples as a source of inspiration and direction, do not copy someone else’s machine. Instead of replicating these machines, make it your goal to improve, alter, or modernize them. Potential sources of inspiration include:

Rube Goldberg’s original cartoons

Rube Goldberg Competition submissions

YouTube videos of functioning Rube Goldberg machines

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Part 2

Part 2 of 3:

Designing Your Machine

Rube Goldberg machines transform traditional building materials, everyday items, and unique objects into functional pieces of equipment that work together to execute a simple task. Spend time gathering items from around your house, purchasing materials from stores, and/or hunting for unique objects at flea markets. Possible building materials include:

Dominos

Wooden boards

Toilet paper rolls

CDs or floppy discs

Fans

Toy cars

Skateboards

Action figures

PVC pipe

Duct Tape

Peg boards

Zip Ties

Magnets

Marbles

String

Get creative!^{[3] X Research source}

Lay out all of your materials on your work surface. Once you’re organized, start playing with the items. As you experiment, combine the materials in unexpected ways to form chain reactions. While you work, keep a record of what combinations worked.
Ask yourself questions throughout the process. What object can you use to send a car down a wooden ramp? What materials will you need to make a pendulum? What can you make with a lever, a marble, and an action figure?

Rube Goldberg machines complete a simple task with a complex chain reaction. You can break down the chain reaction into several different steps, or phases. The steps are connected together by a link. When you design the machine, it is helpful to start with the last step and work your way to the first step. You can create the building plan by listing these steps or drawing the machine. For example:

Task: Pop a balloon.

Step 3: A tack will pop the balloon. The tack will be attached to the front of a toy car.

Link 1: The toy car will slide down a wooden ramp.

Step 2: A pendulum will swing into the car and push it down the wooden ramp.

Step 1: I will send the pendulum towards the car at the top of the wooden ramp.

Sit down at your workspace with your notes and building plan. Quickly construct a prototype of your Rube Goldberg machine. This version of your machine doesn’t have to be perfect. You’ll build a final product later after you test it.

If you run into an issue, don’t panic. Return to your notes and see if you can combine the materials in a different way.

If you are using tools, ask an adult for help.^{[4] X Research source}

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Part 3

Part 3 of 3:

Testing and Revising Your Machine

Once your prototype is complete, test the machine. This first test is to determine if your machine works. If the machine completes the task, proceed to the next step. If the machine doesn’t complete the task, rethink—don’t scrap—your design.

Can you quickly fix the problem?

Do you need to replace an entire step?

Are you using the best materials?

Is your task possible to achieve?

When your machine has passed the feasibility test, you can construct a sturdier version of your Rube Goldberg machine. Assess the machine’s repeatability—its ability to complete the task several times in a row. A test is successful if the machine operates on its own. Test and adjust the machine until it completes the task five times. If the test is successful, make minor alterations and continue on to the final test. If you the machine doesn’t produce five successful tests within an hour, redesign your machine.

What steps are working?

What steps are preventing the machine from working?

Is your task achievable?

After your machine passes the repeatability test, determine if it is reliable. You will test the machine a total of four times. A reliable machine will complete the task at least three out of four times. If your machine passes this test, you’ve created a working Rube Goldberg machine.
Before you present the machine, practice taking it apart and putting it back together several times.

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