Make a rubber-band sound box
Give a rubber band room to move, listen to its sound, and make an instrument of your own.
About this project
Start with one rubber band and a small open box. Pull the band gently and let go to hear its sound. You might add more bands, find an odd buzz you like, or keep a one-string instrument.
Supplies
Materials & tools
- A clean, small, open cardboard box, such as a tissue box with a clear opening or a shallow tray
- One or more rubber bands without cracks, large enough to fit around the box with a gentle stretch
- Optional: a spare box or bands of a different width for another arrangement
Before you start
- Rubber bands may contain latex, which some people are allergic to. Check before handling them. If you do not have a suitable band that is safe for everyone taking part, choose another project.
- Check for cracked or damaged bands and leave those out. Choose a box the band fits with only a gentle stretch. Keep the band below faces. Never aim it or stretch it close to breaking.
Instructions
Fit a band around the box
Rest the box on the table with its opening facing up. Gently stretch one band around it. One part should cross the opening; the rest goes down the sides and under the bottom. If that takes force, stop and use a smaller box or larger band.
Leave room for the band to move
Look at the part above the opening. It should touch the box at the two edges, with empty space underneath between them. Move loose card flaps and tissue out of that space. When holding the box, keep your hands away from this part of the band.
The band passes over the opening and around the outside of the box. The part over the opening has room to vibrate. Pluck and listen
Hook the part above the opening with one fingertip. Pull it a little sideways, then let it go. This is called plucking. Keep the pull gentle and your face away. Listen without putting your ear against the band. Watch it move. You can touch it lightly after plucking to hear how that changes the sound.
Find a sound of your own
If another band fits gently, add it beside the first. Pluck each one separately. Or move the first band to another part of the box and listen again. Make music, look for a particular sound, or keep it just as it is.
Troubleshooting
- It makes a dull tap or buzz.
- Look for a loose card flap or other part touching the band above the opening. Move it out of the way. You can also keep a buzz if you like its sound.
- The box crushes or the band feels very tight.
- Stop and remove the band gently. Try a stronger or smaller box, or a larger band. Do not force them to fit.
- The sound is hard to hear.
- Find a quieter place. Check that your fingers are not resting on the part that moves. Try another box or band instead of pulling harder.
Where to take it next
- Try a wider or narrower band at a gentle stretch and find a place for its sound in your instrument.
- Rest a fingertip lightly at a point along the band and pluck the free section beside it. Notice what happens to its motion and sound.
- Try a different box shape or opening. Keep the fit gentle each time; changing boxes can change several things at once.
A closer look
A plucked band moves back and forth very quickly. That movement is called vibration. It makes the box and air move too, producing sound. The band’s length, how tightly it is stretched, and how heavy it is all affect the sound. The box changes what you hear as well.
What happens if…
- What is touching the part that moves?
- What sound would you like to make next?
- How does the box change what you hear?
What it needs to do
A function can have more than one solution. These options belong to this example; try alternatives thoughtfully.
vibrating element
An intact band that fits the chosen box without a hard stretch. Compare lengths and widths while keeping the tension gentle.
structure
A clean small open box or folded card support. The shape and opening are variables to explore rather than a fixed instrument design.