icoastergons #2: kicking it up a notch

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Blog entry by jamsomito posted 03-10-2021 03:37 PM 427 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 1: making some simple gifts Part 2 of icoastergons series Part 3: holder box »

Now for the special coasters. As it turns out, a 20-sided polygon is known as either a 20-gon, or an icosagon. I had the revelation half-way through this that these had no other option but to be named “i-coaster-gons,” and they shall forever be named icoastergons. Brilliant! Yes I’m a dad :)

Now these really stretched my brain. I ended up putting my tail between my legs and asking for help here:

How it started:

How it ended:

I ended up needing to model these in sketchup, ask for help, print the shape an simulate my fence and stop, figure out a process, and then execute. Not as intuitive as it seems! I imagine this process could be repeated for any polygon with an even number of sides that shares edges with a square. No idea how it would fare with a polygon with an odd-number of faces, or with some other reference sub-polygon.

As another plus, I made lots of different shaped scraps for my boy’s scrap block bin! They have fun building with my random off-cuts.

Next up, a simple holder box.

2 comments so far

View dschlic1's profile


515 posts in 3209 days

#1 posted 03-10-2021 05:40 PM

Nice project. As the number of sides increase, then more it looks round. A hint I received at a wooding show was to vary the length of the sides. Makes the object look less round.

View jamsomito's profile


689 posts in 1665 days

#2 posted 03-10-2021 07:08 PM

That’s a good point, and I did notice that. I was really going for as equal of sides as possible, which is why I didn’t use other methods like lining up by eye or using a miter saw to a line, etc. You’re probably right about good design though – might look better with your method.

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