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The final solution chosen incorporates two of our alternative solutions. It uses the design of The Full Bell and the concrete mixture from the Rocky Shelling solution. We have kept the name of The Full Bell for our final solution. The Full Bell involves two changes to the original Universal Nut Sheller. The mix of concrete was changed to one-sixth cement, one-third sand, and one-half gravel, and five inches were removed from the stator.
In testing, the gravel mix used was stronger than the original concrete mix. We tested small bricks of the gravel mix, the original concrete mix, a mixture of cement with Styrofoam, as well as several different mixtures of adobe. Three separate tests were performed. Each brick was scored with a stiff wire brush for one minute. A twelve ounce weight was dropped from an eighteen inch height onto the bricks. Finally, the bricks were weighted on one side and twisted downward until breaking. In each test the gravel mix used in The Full Bell was more resilient.
Three inches were removed from the top of the sheller and two inches from the bottom. Figure
6.4 shows the Full Belly Project’s Universal Nut Sheller (left) compared to the Creative Innovation’s “Full Bell” (right). Figure 6.1 Full Bell AutoCAD drawing Figure 6.2 Full Bell Rotor AutoCAD drawing Figure 6.3 Full Bell Hopper AutoCAD drawing.
[[Image:Comparison.jpg|thumb|Figure 4: Picture of The Full Bell stator next to original UNS Stator.]]
The top three inches of the original UNS functioned primarily as a hopper.
Figure 6.4 shows the AutoCAD drawing of the hopper. Ideally this can be replaced with any low cost material or container available at construction time. An inexpensive basket, Figure 65, was purchased from a thrift store for our prototype. The basket was then cut to fit over the top of the sheller as shown in Figure 6.6.
Figure 6.5 Unaltered basket used as hopper