This instructable will show you how to make a repeating crossbow, also called a "Zhuge nu" or "chu ko nu." This is a type of crossbow invented in China thousands of years ago that is like an ancient submachine gun. Just push the lever forward and back and it will fire a steady stream of arrows until the magazine is empty. It doesn't have that much power or accuracy compaired to a normal crossbow but it has a fast firing rate and is easy to use.

I have included an instructional video and a step-by-step photo instructable. If you have any questions or any of these instructions are unclear to you please let me know and I will try to clearify.

I think this instructable meets the requirements of the Epilog challenge and the Launch it! contest so I am entering it in those.

Step 1: Gather Materials

You will need:

-A 2x4 in any type of wood, prefer few defects of course (at least 27" long)
-1/2" Sch 40 PVC pipe (at least 22" long)
-Red oak 1x2 (53" or more, other hardwoods are OK)
-A 1/2" x 5.5" x 48" poplar board
-3/8" poplar dowels (recommend three 48" dowels)
-5/16" dowel (at least 10")
-Larger dowel, 3/4" to 1" diameter (at least 6" long)
    -white glue
    -hot glue stick
-String (I used 9/16" venetian blind chord, it is mixed polymers)
-Two 1/4-20 bolts, 3" long, with nuts.
-Wood screws (at least 6, ones that are 2"-3" long would be great)

-Wood stain
-Spray on clear coat
-Brown spray paint
-1.5" wide hinge
-1.5" wide by 1/4" thick oak or poplar board (10")

All of that is available at a hardware store, mine was from Lowes mostly.
<p>Thanks for the instructions on How to Build the repeating crossbow, I'm in the process of building the limb for this crossbow. The limbs for my bow are being made out of 3/4&quot; schedule 40 PVC Pipe. The entire thing is built from Red Oak. On the left side of the bow I did a drawing of a Snow Leopard and on the other side, and don't think you can read it that well it says: &quot;People should not be unfamiliar with strategy, Those who understand it will survive, Those who do not understand it will perish&quot; Sun Tzu's Art of War.</p><p>Again thanks for the instructions on building this.</p>
<p>Great work that looks beautiful!</p>
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<p>super cool. i played romance of the three kindoms, a historical chinese war game, and always wondered if repeating/auto crossbows were real. i didnt expect this.<br> I just had a thought, it wouldnt be too hard to put a trigger mechanism that can be disabled with a switch, then you can have auto shot mode or a trigger mode for when you want to shoot with acuracy.</p>
<p>There is a really cool commercially available one that re cocks itself with a CO2 paintball tank. It is expensive as hell but seems pretty wicked.</p>
<p>What link is the site??? I want to make a Repeating Crossbow that re-cocks itself, is powerful, and accurate! Is it possible to put like a red dot light on the crossbow? Great Instructions!</p>
<p>That would be cool and is definitely possible, I'm sure you can figure out a way to do it if you make one.</p>
I whipped this up with the kids on the weekend. Few things to tweak but goes pretty well. Great instructable. <br>My only headache was having to use imperial measurements, I thought Canada was metric? <br>Either way awesome. Thanks
<p>Cool I always am happy to see someone making one! Looks like it came out good.</p><p>I am apologize about the measurements but I can't say I feel bad at all haha. Here in the USA I have to learn and use imperial and metric and have sets of tools for both in order to get my projects done. People say metric is &quot;better&quot; but it is just easier to think about at first because it is base 10, they are no different really.</p>
<p>would it possible to make a larger/ more powerful crossbow for it? I have always wanted to make one of these</p>
<p>Is anyone else having an issue with the vidoes picture not working but getting sound?</p>
<p>lol, that's the same band saw I have! I didn't think anyone else had that rinky dink thing. I got it at a yard sale a while back and don't know what size blade I need to put in it. any idea what size it is?</p>
<p>I think it takes a 56-7/8&quot; blade.</p><p>Mine is gone now, YAY! (After the motor quit for like the 20th time and this time would not resurrect after a brush cleaning, and the bearings got super hot, I stopped using it and got a bigger one more suitable for my amount of use).</p>
<p>Congrats, I got mine at a yard sail for 15 bucks so I cant complain. I use it every day and it is just not big enough or powerful enough. Someday I will get a new one. One more question. Did you find that you could not make very good precise cuts with the half inch blade that came with it? Do you think a 1/8 inch blade would be better? (Nice prodject too by the way)</p>
<p>I don't remember which blade width I had... but yes it was hard to make precise cuts. It was better as long as I kept the plastic blade-guide pins (which eventually had to be replaced with wood dowels) in good shape.</p>
<p>I made this and it works great, and is really fun to shoot. would it still work ok with fletching? just wondering. awesome build btw :)</p>
<p>It can work with fletching, you may need to change the design of the magazine to accommodate that though. Small soft feather fletching would probably be OK.</p>
<p>ok, thanks keep up the good work.</p>
<p>thank you </p><p>will try to build one</p><p>Joseph Roberts </p><p>9810ST.RT.73 </p><p>New VIENNA OHIO 45159</p><p>1-937-987-2526</p><p><a href="mailto:fallsville@frontier" rel="nofollow">fallsville@frontier</a> .com</p>
<p>thank you </p><p>will try to build one</p><p>Joseph Roberts </p><p>9810ST.RT.73 </p><p>New VIENNA OHIO 45159</p><p>1-937-987-2526</p><p><a href="mailto:fallsville@frontier" rel="nofollow">fallsville@frontier</a> .com</p>
<p>1st of all, this is of course awesome so thanks for proving normal people can make one. But it looks heavy as all get out. Have you considered using other materials? Like I was just watching an Instructable on how to make your own kydex holsters and that stuff is super light, and seems fairly easy to work with, the bolt hopper on top made out of kydex seems like it would drop a couple pounds.</p><p>Thanks again for making this.</p>
<p>What a beauty! Your video mentioned that we would find a link to the plans - in PDF I hope - but I don't see a file attached - except for the pro members.</p><p>Thanks!</p>
<p>The plans are the images in step 2.</p>
Thanks; my computer wasn't displaying all of the pictures.
I would suggest making the bow out of wood it may be harder but its more powerful
<p>it's more powerful if you use metal bar so it will be &quot;repeating arbalest&quot; instead of &quot;repeating crossbow&quot;</p>
I used to use wood bows when i sold these as kits but it is easier to make it out of PVC and the statement that &quot;its more powerful&quot; is incorrect. This PVC bow is more powerful and smaller that the wood bows that were on the kits.
<p>Hard to make.but it's worth of it</p>
<p>Did you make it?</p>
great stuff
Very impressed
there is no measurements for the handle, or did I just miss it
It is there, in one of the lower pictures. You have to click on the images of the plans to enlarge them and you will find it in the image that shows &quot;oak 1x2s.&quot;
Also in the instruction it doesnt tell how to release the string
If you are talking about the thing that puches the string out of the notch, then you are saying things where you don't know what you are talking about again. <br> <br>If you read the last step I describe how sanding the front edge of the notch will make the string slip off at the right time. I have made several of these things and the string-pushing block is realy not needed.
The bow part rather than pvc<br/>
OMG!!! I saw a repeating crossbow in jack the giant slayer but it had two barrels and left me very confused
Just a note, the magazine walls are 18 inches long, not 15. Just a typo. :)
Also, for the top half of the magazine walls, mine's not coming out to 14.5 inches. Is there an error?
Okay, as far as I can tell, the 9.5 inch measurement should actually be 12.5 inches, and the 14.5 inch measurement should be 17.5 inches. That allows the bottom and top edges to be the same size, and allows for the same angle on the spacer and the magazine walls.
I don't know how you are coming up with that. The angle is the same on the back spacer and on the back of the walls if you follow the plans. On the spacer and on the walss, the slant at the back goes down 3.5&quot; and over to the right 5.&quot; <br> <br>I did just find one error which might be the one throwing you off, the 12&quot; for the part cut into the bottom of the magazine should be 9.&quot; Hope that helps. I will upload the corrected image.
Yep, that was it. The 12 inch measurement threw me off, and changed the angle of the wall. Thanks! Sorry to bother you.
OK cool sorry about that!
What do you mean? The will come out however you draw them. I don't think there is any error on the plans.
No, they realy are 15.&quot;
very very cool. i saw one of these in museum once and tried to build one myself years ago. this is excellent work, i would however advise creating a quick diagram showing how it works so others can copy the mechanism with slightly differently sized or shaped parts. i am voting for it.
Thanks! That is a good idea to show the mechanism. Right now I'm thinking that it simple enough that they will understand just by looking at the pictures of the completed thing. But maybe I'll draw a diagram.
really this type of design could be applied to modren crossbows im sure or even just modified with a different lever design to allow you to pull a stronger bow back im sure its all been done before but we have sense lost or forgotten the technology for more "advanced" technology. but whats more advanced than being able to make your ammo in the field with a sharp knife or rock even lol