Turntable: state at the end of the workshop

This is the last state of the Turning disk, at the end of the workshop.

Initially the intention was to explore soundwise a specific kind of circular movement: steel surfaces spinning one on the other, in the form of a kind of ball bearings, say with balls who allow the spinning, but without a central axis.

The way i wanted to document the movement was sound.

Originally i planned to grind tracks on a iron surface, but since the found disks were much thinner than expected, i went further welding instead of grinding.

Interesting point: the best tracks had to be drawn without interruption, but the protection mask doesn’t allow to see the lines to follow, but welding without mask wouldn’t have allowed me to see at all, afterwards. I solved the problem marking the line with a white marker. The white sign still wasn’t visible, but while i was welding, the material of the marks would burn some millimeter before the noodle would arrive, making clear the direction where to continue.

The central axis had to be introduced, the tracks couldn’t be made big enough to keep the construction so firmly.

The welding made a lot of little spheres on the surface, which produced more sound, but were jamming the spheres much more. They had to be grinded away.

The first motor is placed on the top, fixed on an arm that goes outside. The movement is possible, but it jams pretty easily and just a little side pressure on the arm is able to let it move again. I added a second motor to hit constantly the arm on the side: in case of stop, with some pushes the disks starts spinning again, extending a lot the life span of the action.

Here the video of the presentation.

For the presentation I used 6 piezos to mix up the different sounds together and to be able to control them and look for the interesting resonant frequencies.

During the whole workshop I have been recording the sound produced, here a the whole documentation in chronological order.

Next steps: the next development stage would be making the rotation more stable, finding a way to keep the spheres separate, which could be done physically adding some blocks, like small walls, or adding a third disk with holes that would act exactly as the internal structure of a bearings. This would probably generate a lot of friction, that would in a way mean more sound, if the movement starts.

Otherwise another possibility would be making the tracks much higher, in order to keep always the balls in position, and adding enough balls not to give the possibility of having one side without them, that would mean no distance between the disks and therefore no movement.

Here some pictures, to show the result in its own beauty.

Surprisingly, it really looks like a sort of reversed turntable or proto – hard drive, which I like somehow very much, since apparently fits with the sound produced.


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