Making the Dodecahedron
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- Опубліковано 11 кві 2016
- This dodecahedron is constructed from 12mm baltic birch plywood and 120 neodymium magnets embedded in the edges. Some details about the sled for cutting the pentagonal faces are given in the video.
NICE, VERY NICE JOB ! ... I'M DOING MINE RIGHT NOW !!! ... THANKS FOR THE LESSON ! ... I WAS LOOKING FOR THIS A LONG TIME AGO !!!
Thanks for posting this, saw it ages ago and loved it. Just got my first table saw and created one of these (with magnets too) as my first project - my kids love putting it together :)
I'm glad it's not just my kid who loves smashing this and putting it back together.
Best idea ever! I've been looking for a long time how to make large shapes that will hold together, and the magnet idea is such a easy and effective idea.
I would have never thought of using magnets. What fun project!!!!
I can see this being turned into a small storage chest or other container for gaming stuff. So cool.
Very cool project!!
This is great work!!!
SENSATIONAL !!! ... THANKS ! ... I' M MAKING MINE RIGHT NOW !!! ... CO GRATULATIONS !!!
Great video!
Very well done and a good idea with the 120 magnets.
I did a compact one maybe a little bigger the hard way with a hand saw.
When the side is 10 cm, the pentagon diagonal is 16.18 cm. Like the phi number. And if you make the dodecahedron stand on an edge, the hight is exactly phi + 1 = 26.18 cm. That is how to calculate the size as within a cube solid. 😊
Amazing work! I remember in geometry class we had the plastic pieces that could snap together. I think I will remake them with a 3d printer and embedded magnets.
Thanks! It's quite satisfying to play with and can be an interesting conversation starter on your desk. I'd be interested to see how the printed pieces turn out.
this is soooo beautiful ♥
EXCELLENT !
Hermosa pieza de arte, me ayudaste a resolver algunas dudas con respecto a los ángulos hacia el núcleo 🦾
That would make a cool coaster stand.
I need one too. Thank you
Perfect!
Bravo superbe j’adore merci
Make the other 4 shapes of the platonic solids in the same way too! Give instructions, this is great.
Can you give more details on the jig making process? I’m wanting to make a larger one of these.
Woahhhhh, how do you even pronounce this shape? Is very interesting
This is amazing! Can you help me? Which circular saw are you using?
Sorry for my english.
I'm glad that you like it. To cut the parts I'm using a 10" table saw. There's nothing particularly special about the saw. I think you would have a hard time making safe cuts with a handheld circular saw. A compound miter saw could be used instead.
Not only would this be a great kids toy, if you make them big enough they could double as coasters too! Would be the best way to store the coasters until needed... If you get rich off that send me some money
Thanks. We do actually use them as coasters and currently as a candy bowl. Somehow I don't think I'll get rich off of this idea, but I appreciate the interest.
If I wanted to make a bigger version of that. How would I cut the rectangles let’s say 13” all around?
Nice music
What are the magnets polarity arrangements?
I don’t understand why the two sides of the initial rectangle are of different length. Also, how do you position the square for the initial cutoffs of the corners?
wow!!!!!!!!!!!!!!!!!!!!!!!
Do you want a wooden pentagonal dodecahedron? Or a metal triangular nonagon?
Very nice! I gave up on making these on a table saw years ago. I found a mill can be more accurate but jig making is a lengthy process.
How do you know if your magnets are the right way to all match up
You can see in the clip where I'm installing the magnets that I am flipping the stack each time I move to the next hole. This ensures that the poles will alternate. If you ever forget where you are, just go back and compare to the previous. I was most concerned about getting this part right and I've made 2 without a problem, so it's not too bad.
Can I order one in black or gold?
V Cool
mravo respect ....
I am trying to do the dodecahedron but there is some measure that does not fit me. Could you help me?
How much distance is there between the saw and the guide? I have the right angle but when cutting the perfect angle is not left
I'm not sure I understand your question. Are you asking about the miter angle (how far the blade is tipped) or the sled I used to cut the 108 deg sides to make a pentagon?
otimo
Thanks! Glad you liked it.
Arranging the magnets by alternating polarity is not clear in video. I am afraid to glue them in to test. Do you alternate left hole then right hole. How do you know which one is pos. or negative. I can't get my head around it. Nice project but I need help.
To make sure that I had the polarity alternating, I just had them all stacked up in a line and then flipped the line over each hole. If you forget what the next one should be, you can always bring your stack next to the adjacent hole and see if it attracts or repels.
Hi Brian, Do you sell it? I need one. Thanks
Thanks for your interest. I never really considered selling these. It
was more of an experiment in creating the shape and sharing my
techniques. If I decide to mass produce them, I'll post a link in the
description.
Great work but getting the angles right is confusing: 31.7 is given but the dihedral angle is 116.5??
The dihedral angle is measured from adjacent faces. Since the blade angle is measured from perpendicular to the table, you need half of the supplementary angle. (180-116.5)/2 = 31.7 deg.
@@bshusted ty yt - thank you youtube - thank you mr Husted
@@bshusted Wow good point!!
How did you determine the bevelled angle?
The bevels are from the dihedral angle of the dodecahedron. This is the angle for which the faces meet. en.wikipedia.org/wiki/Table_of_polyhedron_dihedral_angles
@@bshusted @Brian Husted I have a query, please suggest me. I want to make a wooden 3V geodesic ball. I have found the edge lengths but I'm confused about calculating the bevelled angle of each pentagon & hexagons of my geodesic wood ball to attach each faces correctly. As 3V geodesic, a kind of an Icosahedron should I follow the dihedral angle of the Icosahedron?
You can try it x1.5 speed
I don’t quite understand the set up for the sled. What dimension actually positions the rectangles.
It's been a little while since I used this sled, but there are two features that you really need to position the rectangles to form the pentagons. The first is the 18 deg angle from the fence of the table saw. The second dimension is the distance the fence is from the blade, which sets the edge length of the pentagons. With the 3" edge length that I made, the short leg of the sled is 3.927".
Not sure what you mean by short leg Brian. I understand the 18 deg angle and then creep up the fence to get whatever edge length one desires. The 3.927 is a result of the cut ?
But with 3 inch edge . X = 3 sin18deg which is .7776. Add the 3 edge length and the yellow short section of the sled perpendicular to the long would be 3.776 ? Thanks for replying . Think I will be experimenting very shortly . I’m intrigued
Sorry . Messed up my scientific calculations. Sin 18 == .309 x3 == 0.927 so now I understand where you are coming from.🙈
How much for one of those badboys??
@brian husted... do you accept orders for dodecahedrons
Sorry. Not a product I'm selling, but I hope you can make your own.
You will need:
12 Pentagons
Why 31.7 degrees on all angles, i really dont get it
It's half of the dihedral angle of a dodecahedron. If you think about the angle between adjacent faces of a cube is 90 degrees. The miter angle would be half of this, so 45 degrees.
I hope (after seeing you have a live kickback) that you are now far more safety conscious. I know a few permanently damaged mates who were cockey about saws. Don't be that guy.
Pause ….. less than 20 seconds into the video… just one word with regards to working on a table saw … PUSH-STICKS. Also I very rarely see anyone on UA-cam with a guard over the blade.