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I have a few nieces and nephews coming around lately and they are always going into my scrap bin to build stuff and then knock it down over-and-over again. I decided to make them a small set of building blocks, complete with two battling catapults. It has 46 blocks in total, made from 3/4" maple stock. The catapults are made from Maple along with a stick of Cherry for their throwing arm.  The ball cup and throwing arm were made on the lathe, the rest was made on the table saw along with a miter sled.

Download the 3D model here

Step 1: Tools and Materials

The tools and materials I used in this project are as follows:

Tools-
  • Table-saw with a miter sled
  • Drill press
  • Midi-Lathe
  • Cordless drill and driver
  • Disk/Belt sander
  • Orbital sander
Materials-
  • 3/4" drywall screws
  • Sandpaper
  • Wood
  • Wood glue
  • 2 small eye screws
  • Marbles or some type of ammo
  • 2 different color ribbons and 4 toothpics
  • spray adhesive

Step 2: Start the Catapults

I ripped some 3/4" Maple stock to 1" wide. Then switched over to the cross-cut blade and used the miter sled along with stop blocks to keep everything uniform and accurate.
The sides of the catapult are 8" long the front and back are around 4" long. So cut 4 pieces 4"X1" and 4 pieces 8"X1".
I also cut 2 crossbeams (Throwing arm stop blocks) at the same time.
After all the stock is cut sand each piece individually.

Step 3: Glue the Catapults

We need to drill the hole for the arm pivot axle. This needs to be as accurate and uniform as possible so I clamped all four sides together and marked for the hole. I took that to the drill press and using a 3/16" brad point drilled through all four pieces at the same time. You might need to do two pieces at a time depending on your drill bit length.
Once the holes are drilled give the pieces another quick sanding. Next glue and clamp them together and let them sit to dry.

Step 4: Make Some Spacers

To keep the throwing arm from floating around on the pivot axle I used 2 spacers on each catapult. I drilled the holes the same way as the sides. then cross-cut them in half. Now slide the axle bolt into the hole and add the spacers in the middle. Push the bolt all the way through and then add some glue to the spacers. Using spring clamps, hold them in place and let them dry 1 hour should be plenty.
Moving on.

Step 5: Make the Throwing Arm and Ball Cups

I used 3/4"X5/8"X6 1/2" cherry stock for the throwing arm. I mounted the piece between centers and marked two lines to give me a visual stopping point. The ball cup side is 2" and the pivot side is 5/8".
Round everything in-between the lines. Then sand to 220 grit. Do this 2 times.
Then I took the arm to the disk sander and removed the sharp corners on the 3/4" flat sides

Now I used 1 1/2" X 1 1/2" X 3/4" stock for the cups. I mounted them in the chuck and used a small fingernail gouge to dish it out in the middle then sanded the inside of the cup. I then took the ball cups to the band saw and removed the bulk of the material needed to shape it round. Next, using the disk sander, I rounded everything to shape and then did a final finish sand for them.

Step 6: Add the Arm Stopping Block

Now we need to add a stopping block to the frame of the catapult. I used a single 3/4"X34" material and cut it to length for each catapult. I also sanded and beveled the top edges on each one.
The stopping point is a bit important. If you mount it wrong it will simply throw the ball straight up, or straight into the ground. I basically raised the throwing arm until it was perfectly vertical and placed the stopping block on the frame. Now let the arm down and slide the block back (toward the back of the catapult) about 1/16" of an inch. The further back you go with it the higher the arc of the ball upon release. A perfectly vertical stopping point throws the ball straight at the target.
while you are holding the stopping block in place drill pilot holes and then add a drop of glue to each point and screw it down.
These are pretty big catapults and my first few throws with marbles throws it about 10-12". This changes with the rubber band size and tension.

Step 7: Cut the Blocks

Time to make the blocks. I grabbed the rest of the maple stock I had left over from the catapult frames and sanded both sides of the boards with an orbital sander. I then ripped some more maple 1" wide and then, using the miter sled and stop block, I cut all 46 blocks to size. Then a quick finish sand.

Step 8: Make the Wheels for the Catapults

I mounted some stock between centers and finish cut it to about 1 1/2" in diameter. I then mounted it in my chuck.
Next finish sand about 5" of the length. Each wheel is 1/4" thick. I marked each wheel and did a quick cut to define the wheels.
Then using the 3/16" brad point bit and my tail-stock Jacobs chuck, I drilled the center for the wheel axles. Then I used my parting tool to part off each wheel one at a time. The wheels are purely aesthetic, they do not turn.
To mount them, I placed the catapult on a small scrap of 1/4" MDF to raise it. then I placed each wheel individually and drilled a very shallow pilot hole. Then put a drop of glue on the hole and put the wheel in place I screwed into final position with 3/4" dry-wall screws.

Step 9: Add the Trigger Release Mechanism

I'm sure there are many different and better ways to add the release mechanism. I simply screwed an eye screw into the end of the throwing arm on the bottom, then held it in position and drilled into the back of the catapult through the eye screw opening. then using a coat hanger or some thick gauge wire to hold it in the "cocked position". Then when you are ready to fire simply pull wire.

Step 10: We Need Some Flags.

We need to make some flags so I grabbed some toothpicks and raided the fiances sewing room for some ribbon. Then I placed the strips of ribbon flat and sprayed them with some contact adhesive. After about 30-60 seconds I placed a toothpick in the middle and folded the ribbon around it. Then using some sharp scissors or a razor blade I cut them to final shape.
I drilled a small hole in each catapult to hold a flag, and I also went to my scrap bin and grabbed some  "failed" chess pieces I had in there and drilled a hole in the tops of them to act as flag carriers. Knock those down to win!

Step 11: Prepare for Battle

We need to add rubber bands to the catapults. I placed a 3/4" screw in the front of each and wrapped a rubber band around the top of the throwing arm and stretched it to the screw. The rubber band will determine how hard/long the ammo will be thrown, so keep some various sized bands for it.

Step 12: How to Play

This should be pretty much self explanatory. Before setting up, test the various ammo and rubber bands to get the distance dialed in.  You can play the game many ways. You can set up facing each other. Or you can set up each wall and flag carrier close to each other and take turns shooting. I also think it may be a good idea to offer a flag carrier move Instead of firing on each turn. (If they are getting close to hitting your flag carrier you are allowed to move it 6" in any direction, but you cannot fire your catapult if you move your flag. You could also offer a re-build move. Allow the re-building of a certain number of blocks per turn as well. You can mix and match these options for a more interesting game.

Update: My daughter was kind enough to shoot a video of it shooting.
You can view it here
<p>awesome</p>
<p>can you show this in video?</p>
Awesome
Hey that's so cool!!! Does it hurt?
<p>I'm sure it could. You need a piece of cardboard behind the targets in case you miss. They leave dents in the drywall.</p>
Hey congratulations on being a finalist in the weekend projects contest! These look fantastic!
Thank you! The children use this game ALL THE TIME!!!
Thank you. I would love to see what you make. :) <br>
Awesome game! Looks like it can entertain kids for hours. :-) <br>BTW, I subscribed.
Thanks Chikpease, I'll return the follow ;) <br>and yes every time the kids come around I have it out for them. I must say though, that they find other ways of playing with it. They sit in chairs and set up cans for targets. And without telling them about the throwing arc, they figured it out all by themselves by placing some of the blocks under the front to increase the distance of the throw. That made me very proud of those little ones! <br>
Thanks for the follow! Awesome to encourage kids to use their minds. :-)
When I come over can I see it!?
Hey Brandon. You can see it anytime ya want to buddy. Maybe you could play it with Lilly. :) <br>
I just have to build this, this is game i want to play, real fun with real people and real damage:D hope i&acute;m gonna aim well;)
It really is a lot of fun! The kids like it too! :) Me and a buddy sit back drinkin beers and take turns shooting at targets to knock down!
these would be excellent for office warfare with marshmallow ammunition.
That sounds like a lot of office fun!
Yes, they are long long gone unfortunately! <br>
The wood costed+$4a hour + any bonus you want but how much is the wood and how many hour do they take to make
The price of the wood Plus &pound;2.50/$3.84 for every hour of your time maybe a bit more seeing they are so good
$3.84? Why so cheap? That's not even minimum wage. <br>:(
Its very sad have you considered making your canons to order. I think they would sell for good money and people seem to love looking at your comments
I'm no good with wood etc so I think I may have a go at modelling the catapult etc and 3D printing this. &nbsp;&nbsp;I think you could probably print most of it in one go and remove the need for most of the screws. You could even use flexible PLA plastic as a replacement for the elastic/band item as it is quite stretchy and elastic. PLA will also allow for each catapult to be a different colour so you could have teams (Green &amp; Red vs Yellow &amp; Blue) or a large scale free for all (Green vs Red vs Yellow vs Blue vs Glow in the Dark Yellow lol). Who said new tech and old fun can't work together :-) I'll let you know how I go when the printer arrives in a couple of weeks. (I'll be using the Velleman K8200 3D Printer from Maplin's and probably modelling everything on 3DMAX / Maya or something like that)
These are some good ideas you have. I would love to see what you come up with. <br>
I wanted to see a video of the catapult in motion
there is a video up now
hi
hi <br>
I think it was called &quot;crossbows and catapults&quot;. Set used plastic pucks from plastic catapults, there was a crossbow that would slide them across the floor, and a dragon. there were other accessories as well. <br> <br>the goal was to build a castle from plastic bricks and defend your flag. Knocking the opponents flag over was the end of the game. <br> <br>a wooden set makes it better. Completely awesome and expandable :)
Yep, I'm old enough to have gotten this for Christmas as a kid. I loved it and it is one of the reasons I made this! Thanks! <br>
here it is. <br> <br>http://boardgamegeek.com/boardgame/2129/crossbows-and-catapults <br> <br>your wooden set could use a thin plywood facade with a shelf in the back for a couple of &quot;towers&quot;, or as seige engines :) <br>
I agree! and is one of the reasons I made this one! <br>
I really must take you to task! .... My son is bugging me to make this ....this like sooo what boys want :-)
You will not be disappointed! Don't be surprised if the girls love it too..
This is awesome! (LOVE that you used pipes in the video!)
Thank you. They really do love to play with it. And it is holding up well to their abuse. Even the neighbor kids got in on the action.
Super Neat!! <br>Super Cute!! <br>You are awesome :)
you are way too kind! Thank you! <br>
I really admire wood working (<em>in this case it is yours</em>) like anything. I can watch an artist like you shaping those wood for hours. In India, I visit Handicraft fairs only to see those tribal wood artists working.&nbsp;
Thank you again. I have enjoyed working with wood since forever. And I love watching those videos on you tube.
Really great idea. Should keep the kiddos entertained and away from the TV.
Thank you. <br>
This will make you the Best Uncle Ever.<br> <br> You should check out the old <a href="http://boardgamegeek.com/boardgame/2129/crossbows-and-catapults" rel="nofollow">Crossbows &amp; Catapults board game</a>. The &quot;crossbows&quot; from that game would make a sweet upgrade to an already awesome project.
yeah, I had the game when i was a kid. I loved it. And yes, I was thinking of making some crossbows for it.
I was thinking of that game as I read this. I miss it.
great
thanks <br>
I wanted to see a video of the catapult in motion
I will see what I can come up with for ya. <br>
Great idea. Used to play a similar game with my brother as kids, but we built small pyramids from marbles and took turns to roll marbles at them. Last man standing won. If you play this facing each other, be careful not to shoot each other in the face by accident.

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Bio: I've built houses, decks, custom cabinets, furniture of all types. Ive done furniture repair and restoration, residential and commercial remodels, restaurant seating and tables ... More »
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