Compound Tetrahedra

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Project by Joshuah posted 603 days ago 2047 views 21 times favorited 16 comments Add to Favorites Watch

I had made a paper one of these in a art class I took in college. I had saw it last week and decided to make one out out of wood. It is a fun, though briefly frustrating project.

By the way the wood is walnut.

Thanks for looking.

-- -Joshuah

16 comments so far

View Kookaburra's profile


745 posts in 727 days

#1 posted 603 days ago

How ever did you figure out the cuts on this? I am very impressed. It is a lot of fun and quite attractive. I would not mind having one of these for the top of my Christmas tree.

-- Kay - Just a girl who loves wood.

View Murdock's profile


104 posts in 987 days

#2 posted 603 days ago

That is amazing, thank you for sharing, and I am glad you took the shadow picture, that is really nice.

-- "Anyone who has never made a mistake has never tried anything new." - Albert Einstein

View Joshuah's profile


150 posts in 1196 days

#3 posted 603 days ago

Thanks Kay. Its just a little math from those geometry/trig days! I used the law of cosines…I know its has probably been a while!
It involves taking a slice of a single tetrahedral, and giving a length to each side (say 1, which in a 30-60-90 makes the other side the square root of 3 over 2.

Yada Yada Yada…Long story short… the angle between the faces is 70.5 degrees. So if you cut the rods with a (70.5)(54.75)(54.75) and you miter with 60 degree angles.

All the rods should look like this before glue up.

-- -Joshuah

View Joshuah's profile


150 posts in 1196 days

#4 posted 603 days ago

Murdock- Thank you, I found that it was hard to see the design by just looking at the wood.

-- -Joshuah

View Sasquatcher's profile


11 posts in 628 days

#5 posted 603 days ago

I like it alot!!! And wow the law of cosines seems like ages ago!!!! Good Job!

-- Sasquatcher

View NewWoodie's profile


2 posts in 627 days

#6 posted 603 days ago

I agree with Murdock… and sasquatcher!!!

So how did you do the finishing on a project like this! Seems very very tedious!!

-- NewWoodie

View Joshuah's profile


150 posts in 1196 days

#7 posted 603 days ago

Thanks all!! I actually did all of the sanding and most of the finishing before assembling. After assembly I think I put 3 more coats knocking it back with 300 grit in between.

-- -Joshuah

View Yuri's profile


54 posts in 1918 days

#8 posted 603 days ago

Well done.

-- Live to Learn

View Dark_Lightning's profile


1581 posts in 1612 days

#9 posted 603 days ago

Very nice! A skeletal version of a stellated icosahedron!

Ref: #17

I take it you built the tetrahedrons, intertwining the pieces as you went?

View Joshuah's profile


150 posts in 1196 days

#10 posted 603 days ago

Very intuitive AtomJack. I hadn’t seen that link before, maybe I’ll have to step up my game and make a real complex one.
And you were spot on, I built the original tetrahedral, then would build one-by-one, locking them together as I went.

-- -Joshuah

View redryder's profile


2071 posts in 1605 days

#11 posted 603 days ago

Great project.

Man I hate math…........

-- mike...............

View deon's profile


2016 posts in 1528 days

#12 posted 603 days ago

Looks great!

-- Dreaming patterns

View FloridaArt's profile


665 posts in 1801 days

#13 posted 603 days ago

One of the most intriguing wood projects I’ve seen. Fascinating.

-- Art | Bradenton, Florida

View jusfine's profile


2280 posts in 1429 days

#14 posted 602 days ago

That looks like the way my picture frames turn out that aren’t supposed to look like that…

-- Randy "You are judged as much by the questions you ask as the answers you give..."

View Jim Jakosh's profile

Jim Jakosh

10264 posts in 1608 days

#15 posted 602 days ago

That is really cool!

AtomJack, I like to use math to get me where I want to go but those shapes blow me away!! As do the formulas!!.............Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!!

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