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Forum topic by bowtangles posted 09-14-2015 12:49 PM 715 views 2 times favorited 11 replies Add to Favorites Watch
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bowtangles

11 posts in 453 days


09-14-2015 12:49 PM

Topic tags/keywords: question dodecahedron light

Hi, i have been trying to build a dodecahedron light project. Unfortunately i am stumped. My angles seem to be off just enough that when i try to fit the third piece in, it just wont go. Anyone have any experience with this shape that can give me a little insight into what i shoukd be cutting my angles at? Right now i am workingon a miter saw.

Thanks!


11 replies so far

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RogerM

764 posts in 1866 days


#1 posted 09-14-2015 02:45 PM

Bow…

Been There – Done That!!!! These photos illustrates the solution I came up with. By the way, the angle of the cuts was 69.095 degrees. Send me a message if you would like additional information. I also did an icosahedron and a tetrahedron.

https://s3.amazonaws.com/vs-lumberjocks.com/nuo8k2s.jpg!

-- Roger M, Aiken, SC

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bowtangles

11 posts in 453 days


#2 posted 09-14-2015 02:59 PM

Roger, thank you! I never thought of jointing the corners that way! I haven’t been a member long enough to to send messages yet. Any other help you could offer would be appriciated though!

View liljimy7's profile

liljimy7

31 posts in 502 days


#3 posted 09-14-2015 03:04 PM

You do good work & have a long lasting project that can be admired & a kitchen conversation piece…..
JFS

-- JFS.brand (woodworker) Northville, MI jfs.brand@gmail.com

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Yonak

979 posts in 988 days


#4 posted 09-14-2015 04:05 PM

That’s a fine and uncomplicated solution, Roger. Well done.

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RogerM

764 posts in 1866 days


#5 posted 09-14-2015 09:34 PM

Bow…

Here is the Icosahedron. Works the same way as the dodecahedron except that the vertices are pentagons and the faces are triangles. The angles of the connecting members are 58.28 degrees.

-- Roger M, Aiken, SC

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RogerM

764 posts in 1866 days


#6 posted 09-14-2015 09:36 PM

And a tetrahedron. Angles are 45 degrees

-- Roger M, Aiken, SC

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bowtangles

11 posts in 453 days


#7 posted 09-14-2015 09:47 PM

Those are amazing! You have great skills. Thank you for sharing, once I get this one done I will be trying my hand at those :)

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RogerM

764 posts in 1866 days


#8 posted 09-14-2015 11:49 PM

Happy to help out. These go together pretty fast and are a lot of fun to assemble. I have used super glue and Titebond III in the joints. The Titebond is a little more forgiving. The vertices were cut in lengths of several feet to the profile of an equilateral triangle or a regular pentagon. The slots are simply saw kerfs. After cutting the kerfs just cut the lengths you need for the vertices.

-- Roger M, Aiken, SC

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Dark_Lightning

2635 posts in 2575 days


#9 posted 09-15-2015 12:39 AM



And a tetrahedron. Angles are 45 degrees

- RogerM

Um, this is an octahedron, it has 8 faces. A tetrahedron has 4 faces. /Geometry teacher. BTW, I like your method of configuring the vertices. I made a dodecahedron out of copper strips many years ago, and the jigs to hold the strips in position while soldering them was a challenge, to say the least.

http://mathworld.wolfram.com/PlatonicSolid.html

-- Random Orbital Nailer

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RogerM

764 posts in 1866 days


#10 posted 09-15-2015 03:17 PM

I stand corrected. Thanks.

My father said that one needs to learn something every day. I have learned something today and am taking the rest of the day off.

-- Roger M, Aiken, SC

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Dark_Lightning

2635 posts in 2575 days


#11 posted 09-16-2015 01:52 AM



I stand corrected. Thanks.

My father said that one needs to learn something every day. I have learned something today and am taking the rest of the day off.

- RogerM

I have to tell you that the trick with the vertices is one I wish I had known about many years ago. Learning is a two-way street!

-- Random Orbital Nailer

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