Wooden Desktop Trebuchet by AcceptableRisk
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The trebuchet is a medieval invention originally designed to lay siege to fortresses and castles. The largest of them could hurl immense stones hundreds of yards. Now you can have one to play with in your own home. The whole device stands about foot tall when unloaded and flings various things ten feet or more. Moreover, this is a nice introductory woodworking project that you can do with mostly basic tools. Make sure to check all of the images. A lot of the details are in the notes there.

 
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Step 1: Materials and Tools

Materials
3/8" Hardwood Square
1/8" Hardwood Dowel
3/16" Metal Rod
Jumbo Craft Sticks
Wood Glue
Heavy Stuff as a Counterweight

Tools
Saw
Miter Box
Ruler
Sharp Knife and/or Chisel(s)
Drill with 1/8" and 3/16" Drill bits
Clamps

You can really make this project out of just about any type of wood. I chose poplar because it's cheap and sturdy. Most big hardware stores will also have oak and occasionally maple. The design is stout enough that you could make it out of something softer like basswood. In fact, it's probably not a bad idea if you don't have a sharp narrow chisel and you're going to be carving the joints with a knife. These measurements call for just a little over six feet of it. Most 3/8" square is sold in three foot pieces. You might get away with just two if you adjusted the size of a couple of parts, but you'll almost certainly have to recut a couple of pieces so you might as well just get three sticks.

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Assassin4627 says: Apr 5, 2013. 11:09 AM
wow this comment stream is the most epic and longest i have ever seen.
sing1ejack says: Dec 21, 2012. 1:54 PM
Thanks for the materials & sizes. To speed things up and simplify it a little I took the side braces off. It still works ok: the uprights are pretty stable, though not as solid as they would be with that third outside brace.
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r-philp says: Oct 16, 2012. 2:10 PM
My son and I just finished building a trebuchet base in your design. It came out quite well. We made some modifications; We doubled the scale. I was able to make a sling pouch out of denim that released properly. I added a catch to the throwing arm, so I can be cocked, loaded, and finally released by pulling the catch. A bucket of pennies provides the counterweight, although I think we're going to look for an aesthetically pleasing rock.
It took two days to complete, with my son doing much of the cutting, drilling and gluing.
Thank you for writing such a clear instructable. The joinery was a classy touch too!

We're going to build a really big one outside next!
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tulekah says: Aug 23, 2009. 10:15 AM
WARNING!!! nobody seems to have mentioned that TIRE WEIGHTS contain CADMIUM to harden them. CADMIUM vapor released by melting tire weights is far more dangerous to life than plain lead fumes. I nkow of at least two cases of near-fatal heavy metal poisoning of mountain man types casting flintlock balls from tire weights!!! Me, i used pennies for me weight, easy to fine-tune the range by adding or subtracting a handfull.
Thundermoon99 says: Oct 7, 2012. 1:30 PM
yes but penny fumes also release zinc oxide
Rangemaster42 says: Dec 8, 2011. 7:19 AM
I have melted tire weights in order to cast bullets for more than thirty years. Provided you do it in a well ventilated area there is no danger involved. Tin and antimony are used to harden lead in wheel weights. Cadmium is mostly used for battery plates WHICH SHOULD NEVER BE USED and for cable sheaths.
I am Silas. says: Sep 4, 2009. 6:35 PM
You could also use dead batteries for weights.
ilpug says: May 18, 2011. 7:27 PM
or a bunch of nuts. the kind that go on bolts, that is.
doodoo123 says: Jul 21, 2011. 9:26 PM
could you give me the sizes of wood i would need to make the trebuchet in double the size. thanks
aagnitsch says: May 2, 2011. 11:15 PM
I had alot of fun making this. my daughter asked me to make a catapult but thought better of it and this was perfect. got wondering what else i can make with this extra wood i bought before i found this sight. Good work on the instrutions
brian5003 says: Nov 13, 2010. 4:44 AM
Just buildt one from your design.  Few deviations......worked great.  Used plasti dip spray on to coat the lead and brass rod for the arm shaft.

Thks, my son really enjoys it.


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brainspater says: Dec 22, 2007. 10:00 PM
Me i use a cannon.
Jake_C says: May 30, 2009. 1:48 PM
bazookas are for wimps, i use laser-injected ninja super amazing rocket lazerbeam -coolwhip sword gun grenade cannons from outer space...
jamalk says: Jun 27, 2009. 1:09 AM
laser-injected ninja super amazing rocket lazerbeam -coolwhip sword gun grenade cannons from outer space are for wimps i use lightsaber+force choke lol kidding
LEDmuffin says: Jul 15, 2009. 7:13 PM
Lightsaber and force choke is for wimps, I use Shoop-da-whoops.
Fashim says: Jul 23, 2009. 2:49 AM
Nice.
Jake_C says: Jun 27, 2009. 10:14 AM
lightsaber + force choke is for wimps, i use bagels
necropolian says: Jun 28, 2009. 2:31 AM
bagels are for wimps, i force my enemies into spontaneous combustion.
jokerlz says: Jun 28, 2009. 11:52 AM
Forcing enimes into spontanious combustion is for wimps, I kill them through the medium of dance.
necropolian says: Jun 29, 2009. 5:24 AM
medium of dance is for wimps, I also use studio 100 music. seriously, that stuff is lethal.
Fashim says: Jul 23, 2009. 2:48 AM
studio 100 music is for wimps. I use a Laser Canon Graphted to my chest that Explodes my Enemies into candy.
necropolian says: Jul 28, 2009. 1:06 PM
a Laser Canon Graphted to my chest that Explodes my Enemies into candy is fot total wimps. I use a strong, undetectable poison.
rabbitkillrun says: Aug 12, 2009. 7:03 AM
strong, undectable poisons are for wimps. I use long repetitive comment threads to distract my enemies while i aim my laser cannon graphed combusting candy bagel laser-injected ninja super amazing rocket coolwhip laserbeam lightsaber sword forcechock gun grenade cannons from outer space shoop-da-whoop bazuka trebuchets...
necropolian says: Aug 12, 2009. 12:57 PM
you know, all this time I do not get a comment on mine, and just as i thought this very morning : " hey, I still do not have a comment on mine! how strange!" and, of course, I get a comment the same day. so, here it comes: long repetitive comment threads to distract my enemies while i aim my laser cannon graphed combusting candy bagel laser-injected ninja super amazing rocket coolwhip laserbeam lightsaber sword forcechock gun grenade cannons from outer space shoop-da-whoop bazuka trebuchets are for wimps... I do not use that, because I do not have enemies...at least not enemies who know where I live, and who really am.
dirty9774 says: Feb 5, 2010. 2:12 PM
ha, you said "forcechock"
necropolian says: Feb 6, 2010. 2:36 AM
No, I copied the text from "rabbitkillrun". He made the mistake.
corey_caffeine says: Aug 12, 2009. 5:16 PM
not having enemies is for wimps. I use bananas.
rabbitkillrun says: Aug 13, 2009. 1:13 PM
bananas are for wimps... i use pacman to eat the banana, then the big dot then eat all my enemies...
jmitch77 says: Sep 20, 2009. 12:16 PM
Using pacman to eat the banana, then the big dot then eat all my enemies is for wimps. I use Chuck Norris.
rabbitkillrun says: Sep 20, 2009. 1:06 PM
Chuck Norris is for wimps. I eat spinach like popeye.
superdude678 says: Oct 20, 2009. 1:32 PM
Eating spinach like popeye is for wimps. I use the Athena orbital defense network's ion cannon. muahahaha
ryanpriehl says: Oct 26, 2009. 3:52 PM
 Using the Athena orbital defense network's ion cannon is for wimps. I just surrender.
rabbitkillrun says: Oct 26, 2009. 5:17 PM
Surrendering is for wimps. I use pacman.
tim_W says: Oct 26, 2009. 7:27 PM
 pacman is for wimps and doesn't ensure everyone's death
I use miley cyrus's party in the usa song guarenteed 100% lethal
Fashim says: Oct 27, 2009. 3:53 AM
miley cyrus's party is for wimps.. I use Hand Held Midgets
Zerg says: Nov 12, 2009. 2:05 PM
Hand held midgets are for whips...I just kill people >:)
I ACW I NINJA says: Jan 25, 2010. 6:17 PM
killing people is for wimps, i spontaneously give birth through my ears
matt_miele says: Oct 28, 2009. 5:15 PM
mr. T pittys you all!
therapist says: Dec 30, 2009. 10:56 PM
ccc combo breaker
jokerlz says: Jan 5, 2010. 11:42 AM
 ccc combo breakers are for wimps. I use discarded hairstyles from the 50s.
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