Instructables
Like many of you, after watching Iron Man 2 (which was awesome, by the way) I was very interested in the “Swinging Sticks” sculpture on Pepper Potts’ desk. A little bit of searching turned them up for sale. They could be mine for just under $300. If they were a whole lot under $300, I would have bought them. Instead I set out to make my own version.



Unfortunately, the one for sale runs on batteries, so this is not an exact replica of it.  This is more like a modified double pendulum.  Double pendulums are pretty cool by themselves.  Much has been written on them, including some pretty cool flash simulations

This is an entry in the Kinetic Sculpture Contest, so please rate it and vote on it when the time comes.

Step 1: Materials

Picture of Materials
At the minimum you're going to need:

Rods for the main beams - I used 3/8" diameter steel.
Bearings - sized to fit the rod
Rods for the axles - I used 1/8" diameter steel.

Drill press
Drill bits
Reamers
 
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I have the original. It uses 4 AA batteries and lasts about 8 months going non-stop (I just leave it going all the time). There is a magnet at the tip of the long end of the long stick. I don't think there is a magnet on the small stick, it just spins wildly due to being flung around by the long stick.

It must have a small reed switch at the bottom because if you hold the long stick straight down for a few seconds, the coil will switch off and it will remain dormant until you kick it back into motion.

dperez2711 months ago
hi! one questions, which ends in magnets should go?
thanks
Nice. To add batteries, simply install one magnet at each end and use this schematic. Actually, you should use a micro controller or incorporate a random generator to push it randomly. Very nice.
sch.jpgSEQA.jpg
hi! one questions, which ends in magnets should go?
DavidMarks1 year ago
Tried to make one of these (unsuccessfuly !) before so I was very pleased to see yours. On thing worries me however. The dimensions you give for your final build don't seem to add up. If the overall length is 13 then surely the distance from the middle pivot to the end of the bar is seven & and three quarters.
minh1232 years ago
it's so cool but i don't know where to find rod for the main beams :( can u help me?
minh1232 years ago
i think that do it with the chopstick wil make it lighter
minh1232 years ago
i think that do it with the chopstick wil make it lighter
Spiky19872 years ago
Hi , i'm trying to do the 3d model of the arms and, the Long Arm. If you put the first pivot at 1/4 and the second 5" after, the End to pivot gives : 7.437 "

Did you inverse some measurement ? As I can see on your picture, the long arm has the second pivot at something like 6"

Thanks :)
jeff-o3 years ago
Very cool. Did you do any research into what sort of mechanism could be made drive the pendulum? I guess it would be electromagnetic or something, running on batteries...
ben_xman jeff-o3 years ago
You can certainly add something like this to it. I have actually made this circuit customly and I works pretty well. There is just an annoying beep everytime the capacitor releases its charge, but it should work.

http://www.solarbotics.com/assets/documentation/solarbotics_sunswinger_kit_jan082007.pdf
bloomautomatic (author)  jeff-o3 years ago
Yes, but I had no intention of adding that, so I didn't dig too deep. I assume it's electromagnetic. There are similar kinetic sculptures that rotate continuously - a jumping dolphin and a space shuttle/planet comes to mind, that are cheap enough to crack open to see what makes them tick.

Vince
Yeah, I had one like that when I was a kid. I wonder if I still have it somewhere? Hmmm...
mikeasaurus3 years ago
Nice project, and the video is awesome. Good job on your craftsmanship, hitting close to that magic ratio is hard.

Have you considered LED's on the pendulum ends in a dark room? Might make a neat time-lapse, too!
aeray3 years ago
Nice four-fold rule. I use a 6' folder frequently, but I haven't been able to find a good four-fold yet.
bloomautomatic (author)  aeray3 years ago
Thanks. I think it's a Stanley #27, if memory serves. It belonged to my grandfather. Not sure how old, but the number style looks older than one I saw for sale that was supposed to be 1940. Wouldn't surprise me to find out it's from the 30's.
bloomautomatic (author)  bloomautomatic3 years ago
I guess my memory isn't that great! It's a "C-S Co. No. 68"
SD530932.JPGSD530933.JPGSD530934.JPG
I'll have to renew my search.
Kiteman3 years ago
Nice piece - I'm impressed that the base is bulky enough to hold it still in use.

bloomautomatic (author)  Kiteman3 years ago
As long as you don't get too crazy with spinning it, it works fine. I should attach it to a larger plate - like 6" square, but I probably won't get around to that since it works well enough as is!
ChrysN3 years ago
Nice!