Home Articles Forums Gallery Marketplace Videos

WoodCentral Forums

Knowledge You Can Build On — Est. 1998

Find a woodworking club near you

An Egg by the Numbers

Posts

An Egg by the Numbers

#1

Dennis in Southern Oregon

An Egg by the Numbers

Dennis in Southern Oregon

Reed G. asked yesterday whether the spheroid turning technique could be applied to an egg. I guessed that an egg could be approximated by a slightly stretched spheroid for the blunt end and a more highly stretched spheroid for the pointy end. Today, I did a trial; I took some eggs from the refrigerator and measured the following parameters of each: The maximum diameter of the egg, and the distance from each end to the point of maximum diameter. It turned out that the three eggs I measured were quite consistent.

Using these results, but scaling them up a bit in size to about 2.3" diameter, I laid out cutting lines for first an 8-sided approximation and then a 16-sided approximation. In effect I had to lay out for two different spheroids, but I only used the marking data from one end of each. (Confusing?). After cutting by the rules and then trimming by eye and sanding, I arrived at the result shown below.

I think the jury is still out as to the quality of the match to an egg. My eye seems to say that the small end should be stretched a bit more. I regret now not using unfigured wood, because the figure is a bit of a distraction in trying to judge the form. Suggestions anyone?


Re: An Egg by the Numbers

#2

Re: An Egg by the Numbers

Craig Daymon

Eggs come in many different shapes and sizes, though the perfect shape to me is a hemisphere on one end and a paraboloid on the other. (Or is that a hemiparaboloid?)

Re: An Egg by the Numbers

#3

Re: Rather fried or scrambled😎


Re: An Egg by the Numbers

#4

Dennis in Southern Oregon

Re: An Egg by the Numbers

Dennis in Southern Oregon

Minor problem is that a hemisphere and a paraboloid will not join smoothly. there will be a cusp. Perhaps a 55%-isphere and a paraboloid?

Re: An Egg by the Numbers

#5

Chicken eggs, etc.

John K Jordan

Dennis,

I keep chickens, guineas, and peacocks. There is natural variation in eggs, even if we only talk about chicken eggs.

My chicken eggs are USUALLY a little more elongated on the small end than yours. They are sometimes a little elongated on the large end too - rarely a perfect hemisphere to my eyes.

Based on my small current sample of 9 hens representing 4 varieties of chickens, the variation seems to be from both the variety and the individual bird.

Your turned egg looks pretty good. I often have to stifle a comment when I see turned eggs where the turner obviously didn't even take an egg to the shop to compare. Or maybe it's just that some people have more trouble with seeing shapes and forms. ??

I found the picture below when my peacocks started laying for the first time so I could compare egg sizes. Peacock eggs are about 3x the volume of most chicken eggs. Guinea eggs are much smaller and far more "pointed" on one end than chicken eggs.

I just brought in fresh eggs a few minutes ago. Most of my chicken eggs have a more "pointed" end than the one in this picture, but part of it could be the perspective. (the "point" diminishes quickly when moving a little from the side profile.)


The next time I set up my photo cube I might try to take some good pictures of eggs to show the variation.

JKJ

Re: An Egg by the Numbers

#6

Re: An Egg by the Numbers *LINK*

Bob Macgregor

There are lots of posters on the web showing the wide variety of shapes and sizes of eggs. We tend to think of supermarket hens' eggs, but the variety in wild birds is huge.

Please overlook the seashells in the attached example.


http://www.zazzle.com/art_nouveau_bird_eggs_and_seashells_poster-228701649653757672

Re: An Egg by the Numbers

#7

Dennis in Southern Oregon

Re: Chicken eggs, etc.

Dennis in Southern Oregon

Nice presentation there John. One thing seems almost always true; one end is blunter than the other. It must be nature's way of maximizing or minimizing some parameter. (Maybe the pain involved in laying it?)

Re: An Egg by the Numbers

#8

Joe Fleming

Re: An Egg by the Numbers

Joe Fleming

When I wanted to make a chicken egg template, I pulled a 18-egg carton from the fridge and inspected all 18. It turned out that only about 5 actually looked like chicken eggs. The rest were defectively shaped. Joe