Here the results of the last day of workshop!
#1 Central axis – welding.
#2 Track corrections with welding and then grinding.
Discovered: the metal deforms very much. Before the corrections, but after yesterday’s welding, the plates were both concave, then they became convex, changing radically the distance between them and the behavior of the marbles.
The correction of the tracks + the central axis let them spin very safely, it happens now rarely, that they jump off the track.
Still the tracks are pretty much irregular, the higher one is a little too thin, so the friction is pretty high and the marbles hit on the sides producing strong noises.
#3 Add the two motors.
The main one is letting the upper disk spin, but sometimes has not enough power/friction to bring it forward. The second motor has an irregular cam that let the main motor oscillate, making the whole movement more uncertain and irregular.
#4 Wooden basis + tuning.
All the pieces should fit together, somehow. I fixed them on one of the famous DOKA Holzplatte!
// SOUND of TODAY!
Piezo under the first disk.
Piezo under the metal basis.
Piezo under the wooden basis.
The sound changes radically at every layer of the structure.
High is more resonant, the middle highlights the hits and the first motor, the lower the second motor.
Nice that the frequencies are a bit enhanced, much more interesting the irregular pauses, where is possible to listen the friction of the gum against the iron.
In the presentation i will try with different piezos controllable in different channels.
AESTHETICALLY i have been surprised, what it actually turned out to be is something like a weird mixture and subversion of a turntable, but visually reminds of a huge version of a HDD. Conceptually they are even fitting very well together.
#to do next.
The next future steps would be….
– A bit better tracks. //maybe a chain could be welded on the spinning wheel, a stable result will be for sure easier to reach. -> interesting maybe for the several different little steps.
– More natural start and stop (controlled with an algorithm). More breaks.
– Keep the spheres separate/at the same distance (avoid jamming).
– Adding a second wheel? More complex rhythm…