How to Make a Geodesic Dome ...even if yer stoopud. Part 1 of 2

[crackedlibertybell]

Great video, brother! Yours is the only "how to" that includes the mathematics for G-domes that I was able to find. Much appreciated!

[doctuthill]

Thanks.



[zliminator]

If N = 40' then your dome would be big enough to hold a couple football fields. Side issue. I just realized that using a soccer ball you see the beauty of the geodesic dome. The pentagons are smaller than the hexagons but the sides are the same length. An elegant solution to designing a dome or sphere.

[batranulgeo]

Hi! If you allow me: If you sign hexagon in a circle you will notice that the length of a side of the hexagon is equal to the radius. How? Well, if we trace rays, we get six equilateral triangles: the center angle is 60 degrees (360 / 6 = 60), the triangle is isosceles (equal sides together and radius), this means that the angles at the base are equal,120 degrees / 2 = 60. QED: the triangle is equilateral. Then why you say that segments within the hexagon are equal to N multiplied by 1.0224?

[zliminator]

@batranulgeo Why use 1.0224? Because its not on a flat surface. If you make the rays a little longer than the sides then you have to bend the rays at an angle from the middle to get the sides to touch each other. Don't you see Jack? That's the beauty of it!

[torupuhur]

you are my Lenin

[LoveBringsTruth]

Ha its built on a trampoline.

You're great. Cheers.

Why not just build a concrete dome house with the air balloons?

[jeffery19677]

Great explanations so far!! I love your entertaining enthusiasm!  Heading to the next vid now!

[SovereignBeing]

do we have to be on drugs to do it?

[daxmick]

I love your explanation! Would you care to give any clues on how your constructed your dome? (like the hubs, materials, bolt dimensions, etc.)

[AllEyesOnEgyptTV]

omg!!! thank you for sharing this info. I've been researching like crazy and never really had an overview of the nutshell. LOL! You made it seems so simple to understand. I like the whole soccer ball explanation.

[DontFriendInviteMe]

I'm picturing people pausing this video to go google hexagon & pentagon. :o\

You lured them with "stoopud".

I'd like to commend you for actually giving instruction though. I have been browsing around dome videos since yesterday. This is the very first "build" video, that didn't entail a high speed, music overlapped, useless video, showing an entire build taking place in under 10 min. with zero instruction. Kudos

[neato3000]

Epic.. nuff said

[Biofado]

Amazing simplicity!!

:-)

[Reximusprimebeta]

for a 3v, or three frequency, dome you have a 3/8 or 5/8 to get the straight lines you are talking about. desertdomesDOTcom has a calculator for those who don't have the math skills. I used it to calculate the struts for my model dome that is currently under construction.

[yesiamanalien]

The 2 that thumbed down this vid musta been stoopid.... you managed to explain how to do it in a way that anyone with even a touch of effort should be able to comprehend.

[christuimbirek]

yayy what i was looking for 8D tnx mate ....and any i idea how to fill the holes whit concrete ;)

[christuimbirek]

stoopud?

[ravenessex]

very cool!!! 

[8DoverNJ]

Great vid.  I'm actually starting to build one of these in my garage and noticed the similarity to a soccer ball. Thanks for clarifying the strut lengths. That part of it was confusing me a bit.....until now! Many Thanks!

[timeformation]

you can use 2 " sticks" lengths if you want a simple dome ie. 2v is the general term... u seem to pass on that fact very quickly.. in any case, you did specify that, so i am not complaining..

in any case, lets say you have your 2v dome and want to make it form 2x4's.. if you wanted to not use hubs like u did, what will be the double angle to cut on the tips.. the cut on the 4" depth where the hubs would be?? can u help me with that sir?

[hondo1188]

but i'm confused why you chose the letter N and not P, or F or some other letter. or why did you even use the english alphabet? couldn't you use a japanese symbol or something? you should have used O since it most resembles a soccer ball i'm thinkng.

[enclave2k1]

Hey Jamie,

Maybe I'm missing something, but shouldn't the length of the sides of a hexagon equal the distance from a vertex to the center?

I realize your calculation was really close to 1 (1.08*n), but I think it should be 1 exactly. 6 sides, 6 triangles, inside angle of each triangle is 60, so the other 2 are 60. So, each is an equilateral triangle. All the sides are equal then.

Maybe I misunderstood what you were figuring out. Anyway, great vids.

[enclave2k1]

Oops, sorry not 1.08n, but 1.0224n. I think that should be 1 exactly. Not trying to nit pick, I'm genuinely curious.

Great vids!

[JMEMantzel]

Heh heh. They would be the same length if it was for a flat shape. The dome is supposed to curve, though. If you make the "spokes" a bit longer they bulge out to conform to the curve. :-)

Pretty spiffy, eh?

[enclave2k1]

Ahh, I didn't realize those spokes were meant to curve. Well, that explains why I thought your pentagon spoke measurement was off too.

Pretty spiffy!

[JMEMantzel]

heh heh. yyyep! I'm glad it makes sense now. :-)

[Demonkillper]

just sticking my nose in, but you could also make the inner lines a bit longer and you would get a spiked dome, i think.

[pekkahontaz]

Really nice that you for once teach how you do stuff and not only "yeah.. i put this... thingy here on this stuff here" :)

I don't mean you should do that in every video, it would probably take too much time from actually making stuff, but you seem to be a good teacher :)

[AngryPride]

LOL what is up with the latest comments here? Anywho. LOVE your videos. xD

[JMEMantzel]

err... ya. I guess I should just erase that crap.

[onelastusermname]

@JMEMantzel

dont worry about it

your doing awesome things, there will always be the nay sayers

I love all your video's, watch them all the time

just call um youtube haters

[Herfmonster]

Not to mention thinking outside the box...by thinking about the box...fish boxes.

Fish boxes for insulation... functional, green, and architecturally interesting. I watched as they crept all across the banana building and loved it.

Thanx.

[JMEMantzel]

Ya, I'm really happy with them. ....in all the ways you just said. :-)

[Herfmonster]

Thanks for both of these videos. It's great being able to subscribe to something as entertaining and informative as your channel.

Some things just need to be done the right way... like the geometry of a dome. Some formulas just work so why mess with them?

On the other hand there are things like the garage door to the banana building where you fabricated what was in your head instead of buying a ready made garage door

Out of curiosity on your dome what is your measurement for "N"

Thanx in adv

[JMEMantzel]

Oh... lets see... my measurement for "N" is just under 5 ft.... since I was using 10ft pipes. Something like 4'8''...?

[garageTroll11235]

I love it! I am going to do this! You are freaking inspirational! Thank you for showing us how it is done (not just the dome...)! What thickness of steel pipe should we use? Very very cool!!!

[JMEMantzel]

Oh, I used 1 1/4'' pipes. "EMT" from homo depot.

[nicktuckwell]

Excellent info, and very clearly presented!

What happened to the previous video: "Operation: Crazy Operation Part 35 Greatest Robot Lab Ever! (Diggity done!)"?

[JMEMantzel]

Oh.. ya. I had to reload the last video. Youtube error. Its all ok now. ....although I lost all the original comments and stuff. oh well.

[nicktuckwell]

Oooh! Thanks for letting me know... *Goes off to watch*

[futsalfred2]

I never really noticed that your triangles formed pentagons and hexagons.

[JMEMantzel]

Ya. Its pretty easy to not notice. ....but once its pointed out, they stand out a lot. :-)

[Repeatlessness]

This is sooooo cool... thanks J

[JMEMantzel]

super! I'm glad you liked it! :-)

[Myrm1don23]

aMAZING

[tcbink]

I goin ta billed a sokker ball tomaro. Cool man.

[scunner3rd]

Great explaining, You should go into teaching.

[JMEMantzel]

I AM in teaching. What do you think I'm doing on youtube. :-P Its like a classroom where no one is forced to attend, and there are no rules! Its the bestest skool ever!

[bdrman2004]

do you make any money from posting videos on you tube?

[JMEMantzel]

Ya... like a dollar or 2 a day.  ha ha. ....but it is nice to get a check once in a while. :-)

[dkeizer05]

You already figured out that there's 20 hexagons and 5 pentagons in a sphere. You don't have to count them all to get a total of sticks....

20 hexagons x 6 "spokes"= 120

12 pentagons x 5 "spokes"= 60

.... I don't know how to use math to get the outer stick parts, you might have to count those or something.

[JMEMantzel]

ya.  that.

[tronicgr]

Great info!!! Thanks!!! ♥

[dkeizer05]

I thought you just go to that one geodesic dome site and get the plans for one.

[JMEMantzel]

what huh?

[zeewrath]

ty for posting this vid look forward to the 2nd one

[JMEMantzel]

heh heh. already done!

[WyleCavu]

How to make a dome if we lack engineering skills!

Soon...

[JMEMantzel]

What? but but.... lack of engineering skills is covered in "even if yer stoopud"