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Hey y'all! This is my entry into the Kinetic Sculpture Contest.

This is a kinetic sculpture that catapults ping pong balls into the air, into a basket, and back to the catapult. It runs for as long as you want it to with a motor, and a rubber band powers the catapult. A mechanism at the end allows each ball to load into the catapult one by one. It's a useless machine, but fun to watch. :-)

This machine is made to use 38mm ping pong balls.

Here's the video of the ball juggler in action:



So, let's get building! I hope you like it!

Step 1: Parts List

Here's all the pieces you'll need to make the ball juggler:

Rods: 279
  • green-98
  • white-38
  • blue-92
  • yellow-35
  • red-9
  • flexi-rod (gray rod length)-3
  • rigid tan-2
  • rigid black-2
Connectors: 225
  • dark gray-11
  • light gray-5
  • red-34
  • green-25
  • yellow-45
  • white-14
  • orange-24
  • blue-27
  • purple-40
Other: 127
  • blue spacer-51
  • silver spacer-43
  • tan clip-21
  • Y-connector-7
  • rubber band-1
  • motor-1
  • small blue gear-1
  • red gear-2

TOTAL: 631

If you have all of these pieces, then you may begin! If you don't, then you could still try, and leave some pieces out (even though it won't work as well). Tan (red rod length) or black (gray rod length) rigid rods can be replaced with red or gray rods.
That's awesome! I'm going to post an instructable of my own soon! :-)
<p>Don't post 4 of the same comment</p>
<p>t&uuml;rk varmı</p>
<p>?</p>
<p>Nice! The only thing I do not have is the ping-pong balls. Once I find some, I will build this.</p>
<p>Thanks! Have you found any ping-pong balls by now?</p>
<p>You're welcome! :-) No ping-pong balls yet, but I'm working on it.</p>
Here it is! I finished building it and it works great!
<p>Looks nice, thanks for building!</p>
That's awesome! I'm going to post an instructable of my own soon! :-)
<p>Cool, thanks!</p>
That's awesome! I'm going to post an instructable of my own soon! :-)
That's awesome! I'm going to post an instructable of my own soon! :-)
I had to tweak this slightly but still a great instructable! 5*
Thanks!
Now I just need to adjust the angles and get a more powerful rubber band and I'll have a super cool ball lift. :)
Cool!
I love it man! It counts as a ball machine I can make!
Cool, thanks!
Built it!
Nice, does it work well?
Once in a while a ball will miss the basket, but other than that I would strongly recommend it!
Hey I managed to build 2 of these. I found a way to conect them together and with some moding i have a dual one. wil post a pic soon if thats ok :D
That sounds cool!
after the ball gets flung into the basket the ramp leads to the other flinger then that ball gets launched into the other basket then it all happenes again...very donfusing...lol :D <br>
Haha :-P
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That's a bunch of XD's!
Looking back on that....I actually wonder how many people flaged me for spam...
O-o I know. Me!!
cool!
Somebody call the NBA I think we got an allstar :)
Oh, what the heck. I've finally got some ping pong balls so why not. :-) I've got nothing better to do.
Cool! Send me a picture when it's done.
I am having difficulties. :-(
me too its with the catapult it wont go all the way down to pick up the ball<br>
With what part?
CRAP! The ball dosen't want to make it on the catapult because the arm doesn't go down far enough!!!!!
Shadowman39 I'm a huge fan of you and i build this thing, it's realy awsome and I have fun with it. I don't have a picture, sorry <br>I also build the Knex Cristmas Wreath and the Hole Puncher. <br>Keep on doing this great work.
Glad you like my Ibles! :-)
i am having trouble getting the catapult to hit the ball loader i think you shortend te turning mechanism too much<br>
project juggle sounds good :)<br>
Haha :-P
awesome <br>
Thanks!
This is great! 4.5 stars.
Thanks!
thx **5**<br>
can you build with micro (I recently made the coin sorter but took it apart bcuz it didnt work
Probably yes, but it may not be strong enough for the rubber band.

About This Instructable

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Bio: On my page you'll find lots of different Knex projects, from ball machine lifts to useful (and useless) items. I hope you enjoy!  _______________________ ... More »
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