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Project by RogerM posted 09-15-2015 09:31 PM 5040 views 17 times favorited 12 comments Add to Favorites Watch

After seeing some of the postings on polyhedrons I thought I would share the method I use to make them. The slots in the vertices are simply saw kerfs and the segments are thin strips made snug in the kerfs. Pictured are a dodecahedron, an icosahedron, and an octahedron.

-- Roger M, Aiken, SC

12 comments so far

View greg48's profile


628 posts in 3635 days

#1 posted 09-15-2015 10:35 PM

I appreciate the effort you went through to figure these things out. Have you anything in mind for these ”...hedrons”? If nothing, you could always abandon them at the local HS science classroom.

-- Greg, No. Cal. - "Gaudete in Domino Semper"

View RogerM's profile


806 posts in 3276 days

#2 posted 09-16-2015 12:05 AM

Greg -

Thank you for the compliment. In answer to your question, I have made a number of these as it seems a lot of people find them quite interesting. These particular ones were made some time ago on a dare and hang in my shop with a lot of other curious items I have made. Several people use them for plants placing a pot in the center then plant ivy, a philodendron or some other kind of vine. If you are interested, the angle for the dodecahedron is 69.095 degrees. The angle for the icosahedron is 58.28 degrees. And the angle for the octahedron is 45 degrees. Try them. The go together rather fast and are fairly forgiving to assemble. I have used super glue and Titebond III to assemble them but find the Titebond a little more forgiving.

-- Roger M, Aiken, SC

View Pointer's profile


455 posts in 1988 days

#3 posted 09-16-2015 03:07 AM

Interesting design. I can see where they would be a nice addition to a porch or backyard.

-- Joe - I am not entirely worthless, I can always serve as a bad example.

View SlideRule's profile


20 posts in 1867 days

#4 posted 09-16-2015 01:13 PM

Very nice—I think this method is much more forgiving than mine…and probably needs less wood filler at the end.

View drbyte's profile


845 posts in 4939 days

#5 posted 09-16-2015 05:09 PM

Interesting approach! You say the dodecahedron angle is 69.095. Which angle is that? Is that the angle on the end of your thin strips between the vertices? What angle is on the vertices pieces?

-- Dennis, WV

View oldnovice's profile


7667 posts in 4245 days

#6 posted 09-16-2015 06:05 PM

Outstanding idea!
I think these would make outstanding hanging light fixtures by covering the exterior with cloth, plastic, or even veneer.
Using an LED lamps to keep the heat down and reduce the time between lamp replacement. You could even use a dimmable lamp.

-- "It's fine in practise but it will never work in theory"

View Randy_ATX's profile


881 posts in 3319 days

#7 posted 09-16-2015 06:09 PM

Very cool!

-- Randy -- Austin, TX by way of Northwest (Woodville), OH

View RogerM's profile


806 posts in 3276 days

#8 posted 09-16-2015 08:14 PM

Dennis, WV

The 69.095 degree angle is indeed the angle at the end of the thin strip. The thin strips are all identical and the only pieces that matter. The vertices are an equilateral triangle for the dodecahedron, a regular pentagon for the icosahedron, and a square for the octahedron. Slots (saw kerfs) are cut in the corners to receive the thin strips. If you have additional questions feel free to send me a message and I will try and explain the best I can.

-- Roger M, Aiken, SC

View RogerM's profile


806 posts in 3276 days

#9 posted 09-16-2015 08:20 PM

SlideRule – I kind of like the formality of your dodecahedron although I can see that it would take a lot more effort and care in constructing. Guess there are a lot of way to accomplish things. Most pleased that there is now a mechanism for us to share our thoughts and approaches. Stay in touch.

-- Roger M, Aiken, SC

View SteveGaskins's profile


762 posts in 3464 days

#10 posted 09-16-2015 10:16 PM

Roger, very creative and unique design. As a mechanical engineer and woodworker, I have always had interest in such projects. I like your approach of making these…added to favorites. Glad to know I have a neighbor (kinda) here on Lumberjocks.

-- Steve, South Carolina,

View RogerM's profile


806 posts in 3276 days

#11 posted 09-17-2015 01:56 PM

Steve – Really appreciate the compliments. Indeed, good to know that there are some other engineers traveling down a similar path. I am a retired nuclear engineer with a mechanical option. I kept noting that similar items were being posted on occasion and wanted to come up with an easier, more forgiving way to make them. These ideas came up one nigh while I was trying to get to sleep. Counting sheep isn’t for everyone you know. If you are ever down in my “neighborhood” look me up.

-- Roger M, Aiken, SC

View Holzarbeiterin's profile


67 posts in 2159 days

#12 posted 09-26-2015 05:17 AM

Hi Steve,

I really like this. I built a geodesic dome home in VT. Something like this would fit right in the place. Need to think about how to do it. Thanks to everyone for the informational comments. That will really be helpful when I make mine.

-- Linda - It's only a mistake if you do it twice!

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