Easter is coming soon and I hope that alot of you will find this instructable helpful. I'm going to show you how to make giant Easter eggs out of regular insulation polystyrene. I used 100 milimeters thickness polystyrene for making 1 meter eggs. You can use this tehnique for making almost any round shaped object.

Step 1: Draw the Egg

First of all you should know how to correctly draw an egg. I'm usually using circles to draw the eggs, just like in the picture. At this point you also need to choose the polystyrene thickness and use it on your scale drawing. This way you'll be able to find the diameters of the circles  you'll be cutting later out of insulation polystyrene. Don't worry, you'll see in a minute exactly what I'm talking about.

Step 2: Cutting the Circles

I used a jig saw for cutting the circles. I found a special long blade designed for cutting polystyrene. I actually cut some of the smaller circles out of the bigger ones, so my egg was almost empty on the inside and also very light. After cutting the polystyrene circles you must glue them together in the right order. I used regular insulation polyurethane foam as a glue because it's light, has a great bond, and also because it was the best choice, considering the following steps.

Step 3: Preparing the "lathe"

The idea is to cut out the corners of the rough egg and make it smooth and round using your drill "lathe". The lathe is actually made of a long screw that goes through the rough egg and two polywood circles. The whole lathe is powered by a driller.

Step 4: Using the "lathe"

Here's a video with the whole procedure, and also a picture of some eggs we made. You can paint them after with any solvent-free paint.

OK, totally off the subject. I stopped at the circles you drew to make the egg. It reminds me of a geometry teacher I had that would teach and make us draw shapes with only a straight edge that we could mark on (edge of a piece of a paper) and a compass withOUT measurements. Brain farted. How do you find the radius with the diameter without a ruler? Stupid I know.
An eggcellent project, well documented, and I really envy you having that amount of space to work in.<br><br>I'm going to question your use of the word &quot;Correctly&quot; in step 1. Eggs are a natural product and come in a variety of shapes. The construction you offer is certainly interesting, but I wouldn't say that this or any other form is &quot;Correct&quot; or &quot;Incorrect&quot; it is just one way of achieving an egg shaped result. I'm sure anyone with basic drafting skills can think of at least two or three alternative constructions for an object that would be acceptably &quot;Egg Shaped&quot;.<br><br>
Well, you're right about that. My point was that if you see a &quot;human made&quot; egg that is to faar from the shape that I used you'll say yourself it looks funny. The shape I use is never going to be called &quot;to thin&quot;, or &quot;to fat&quot;, it is actually just how people expect an egg to look like. I saw alot of so called giant eggs that were tall but, very thin and they looked more like an american football.
I did realise that was what you intended, it's just the impression that there is only one &quot;Correct&quot; way that makes my hackles rise.<br><br>Of course there's a place for &quot;Stylised&quot; eggs too.<br><br>Mind you, (looking at your project I'm sure you will appreciate this,) I now have an image in my mind of a team of bunnies checking the eggs for &quot;Rejects&quot;; rather like the Squirrels checking the nuts in Willy Wonka's factory. Too &quot;skinny&quot;, or &quot;pointy&quot;, or whatever and down the chute it goes leaving only the perfectly egg shaped eggs to go on for decoration and distribution...
Ha, ha, ha! Good one. It's funny also because we really made a team of bunnies that interacted with the eggs (about ten).

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More by propart:The "Ring-Box" Ring T-rex (Turn almost any 3d shape into a real object) Giant Easter Eggs 
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