This pendulum wave was a project for my grade 12 portfolio class. It was a self led assignment, so we were allowed to make a piece of our own choice. I had seen videos of pendulum waves before, and we were studying pendulum movement in physics, so I decided that this would be an interesting project.
I made the design to use two of my favourite materials, metal and wood. The wood for the beam and the base, along with the eyelets can be purchased at Home Depot. The heavy thread and maple spheres were from Michael's.
This project took about 10 hours to complete, and the cost was under $50.
[I've included some videos of it in action in the conclusion]
Step 1: Tools and Materials
Step 2: Steps 1 and 2
Step 3: Steps 3 and 4
Step 4: Steps 5 and 6
Step 5: Step 7
I figured out the lengths of the pendulums after having built the frame, which is probably backwards. You would be best off creating your pendulum lengths before making the frame so that you can build the frame to fit them exactly.
This is the calculator that I used to pick all of my pendulum lengths, credit to Paul Liu at hippomath.blogspot.ca for creating it: CALCULATOR (you can pick number of pendulums and set limits for sizes, super helpful)
Step 6: Conclusion
Overall, building the pendulum wave went by very quickly. The longest part was probably stringing the pendulums up, because you have to be very specific about their length and avoid any twisting.
The result is a lot of fun to play around with. It goes through about 2.5 cycles before it gets out of sync. Because I didn't build my frame as a curve for compensation, the pendulums sit on an arc. I really enjoy the way it turned out, if I were to do it again I would probably make it a bit smaller so it could sit on my desk.
Thanks for reading!