# Dodecahedron coin bank

This is a 12-sided figure that i made at the shop at my high school. You will see that you may not have the tools/materials needed for this project. But if you are up for it, it is not impossible. This project has a lot of math involved with it, so it would be help full to have CAD(Autodesk). YOU NEED TO BE ABLE TO WELD

(OXY-FUEL WELDING)

You will quickly notice that there are no photos of me actually putting this thing together, and that is because l was not allowed to bring a camera/phone into the shop.

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## Step 1: Doing the math

First above all, I personally did not do all of the math. I did all of the math on paper, then had a friend do the CAD. So, this project has a total surface area of about 87-90in squared, so if you divide 90 by 12 you get 71/2. This number is about the are of a pentagon. We will be making 12 pentagons that each have a 7.25in. surface area.

The dimensions for this project are listed below.

1. side length: 2 in.

2. area: 7.25 in.

3. height: 3 in.

Now you can just "plug" these dimensions into the CAD. Once you are done with the CAD, you can print out the scaled pentagon, and trace it onto cardboard. Then tape all 12 pentagons together to make sure there are no gaps in your design. After you have done this, we will move on to the next step.

## Step 2: Cutting it out

Now that we have done the math, we can start to cut it out. To cut it out, I used a plasma cam, but you could use anything as simple as a Beverly shear. I am not going to explain how to cut it out with the plasma cam, supposing that if already have one, you already know how to use it.

## Step 3: Welding it together

to weld together, first tape all pieces together w/ masking tape, just as with the cardboard model. Then just tack(weld tack) each of the corners. After you have done this, you may weld the pieces all the way together.