The task this week was to make a mold and finally getting a piece.

In addition to be mathematician, i am also a musician. Something that I had in mind since long ago, was to transform the noise in sounds coming from some instrument.
So that I used a piezoelectric to sensing the vibration of the environment. The interesting thing about using piezoelectrics is that are microphones of contact, by which we can record ambient sounds by contact.

The next part was to define the piece you would use to coat the piezoelectric, I decided to choose an ear because I wanted to represent what John Cage felt when he listened the environmental noise. Cage loved the noise because he thought that those sounds were not reproducible , the noise was music for the. For this reason I wanted to convert the noise in music.

Then I designed the ear in Blender and improved the mesh in Netfab, finally I printed the piece with the ABS Makerbot.

Downloading link for my archive:
Archive

I fabricated a box to enter the piece inside and thus produce the mold.

To produce the mold I used two compounds "rubber" and "urethane" mixed in equal amounts. For this operation is necessary to use gloves because the urethane is toxic.

Once we emptied all the compound we wait at least 6 hours to solidify the mold. Then that solidifies, we make a cut in the mold to remove the piece of printing. With much carefully we remove the piece trying to not break the mold.

Then we use the following products to fill the mold with resin.

We must be careful to avoid bubbles from forming, so for this task we use a syringe.

This resin is rapid hardening, we just need 15 minutes to obtain the part.
With extreme care we introduce the piezoelectric transducer so you can embedding in the final piece.

Once you pass 15 minutes, we proceed to remove the piece of the resin from the mold, in our case the workpiece was pasted to the urethane mold because it was not used a mold release. This made it much more complicated remove the piece.

Finally once we got the piece, we programming in Pure Data the microphone input.

Using the object "fiddle~" we do a Fourier analysis to obtain the frequencies that captures the piezo, the fundamentals and the amplitudes. We use a MIDI output to hear the result.

Finally: