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First of all--good instructable and I appreciate your willingness to receive feedback--I learn so much from others. One additional thing you could do is make the pins look nicer by sanding more off the ends (so the end grain isn't so course).
Asier, thanks for taking the time to respond. What is the radius of your bowl? I don't have software to open your print files. I have another question too- why did you choose a square wave as the sound you use? If I remember correctly, square waves are much more difficult to produce, having many high frequency components in them in order to reconstruct. Why didn't you simply choose a sine wave as the sound file? Thanks again, I AM going to build one of these!
Must the radius of the bowl be exactly the same as yours? Could I simply find a spherical bowl approximately the same size and use that instead? I know the bowl would need to be spherical so that the radius is uniform and the transducers are the same distance away from the focal point.
Very nice, I restored one of these but the switch wouldn't work and I was required to take the switch apart, clean, and reassemble (which was a bit difficult). Check out this link if you need a detailed article on rebuilding an old drill switch: http://www.shareyourrepair.com/2015/01/how-to-fix-switch-and-change-cord-on-thor-model-4199-independent-pneumatic-tool-co.html
You can find shark teeth in Kansas too, here's my collection:
LED Cube 8x8x8
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