Testatika Small Machine Testbed 2 - August 10-11, 2005 - Initial testing

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[Testatika experiments], [Testatika small mach. 1]

Testing showed that the new machine could be run with the wobble largely gone. However, it can still have wobble if adjustments are made so that it will. If that is done, then results are pretty much the same as were with testbed 1 here. However, the whole idea behind the new testbed was to see what happens without wobble. The result was that a new set of spikes that turned out to originate from interference from the new motor and that there was nothing resulting from the movement of the wires through the grids.

In all the oscilloscope shots below, the main wave is the 60Hz sine wave coming from household wiring.

Channel 1 (top trace on pictures below) is from right, disk-facing grid and the corresponding back grid.
Channel 2 (bottom trace on pictures below) is with the ground connection of the probe connected to ground and the other connection connected to an xacto knife blade.
The spikes. As the above pictures show, the top trace is from the small machine, and the bottom trace is from a ground wire and an xacto knife. Clearly, since both show spikes, the spikes are from interference from the motor. The next two pictures further illustrate this since the timing of the spikes does not match the timing of the disk rotation.
The rate for the spikes is measured here as 396.8Hz.
At the time that these traces were captured, the phototachometer indicated that the disk was rotating at 1008RPM. This means that the rate of the wires passing the grids being used for measuring is 336Hz [(1008rotations/minute / 60seconds/minute) * 20wires/rotation = 336wires/second]. In this picture, the scope's cursors (dotted vertical lines) have been positioned to show where the spikes would have to be for 336Hz (337.8Hz in the picture since that's the closest the scope could to for this resolution). Clearly the cursor that is to the right of center shows that the center spike is nowhere near where it would be if the spikes were coming from the wires.

The conclusion is that there is nothing useful coming from this small machine testbed with the setup so far.

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Back to Testatika small mach. 2
Related links:
[Testatika experiments], [Testatika small mach. 1]