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The first frame I built using wood and aluminum wasn't stiff enough.
When I put the cones in motion the whole assembly shook.
So I built a new one using steel.
I used 3 all thread 3/4" BSW as columns and welded three 1" gas pipe pieces to each ring.
I also made an equilateral triangular base and welded a 3/4" nut at each apex.
Later I assembled the frame using 3/4" nuts to hold the rings in place and to easily adjust the cones' balance.
The following photos show the finished assembly.
With this arrangement, I hope to sustain the humming sound.
I performed some tests while rotating the cones by hand.
I wasn't able yet to detect any undesired behavior when using steel threaded rods near the rim.
All the magnets were fixed with masking tape because I'm still trying to find the best configuration.
The actual air gap I have is ½", but it needs a little more magnetic repulsion to avoid magnet contact when spinning at high speeds.
Because the magnets in the device were placed with a 1/2" air gap which is smaller than the previous air gap between the outer ring and the cone rim to avoid attraction of the cone magnets, I will stack more magnets onto the ring magnets.
If no result is achieved by this change, I'll purchase new magnets of the proper size and dimensions.
The bottom oscillator worked better than with the prior frame, and the balance was easier to maintain with the nut adjustments.
The bottom square board shown in the photo is to prevent scratching the table below.
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