Introduction: Knex Crossbow

Fires up to two shots at once, and has adjustable power. This design, with less power, can also fire 'spodies at short range.

Step 1: Pieces

Rods:
yellow-14
blue-12
red-8
white-20
green-36
gray-2*

Connectors:
yellow-24
blue-4
red-19
white-6
green-6
gray-7
orange-4*

Other:
blue spacers-16
sm. wheels-2
black connecing pieces-12
rubber bands-8 or more
string-about 1 foot

*need one to make one shot*

Step 2: Connecting Pieces and Trigger

The two connecting pieces should be opposites (as shown).

Step 3: Ammo-locking Thing

enter longer description for this step

Step 4: Assorted Other Pieces

The last four are used to adjust the power.

Step 5: Arms

Make two opposite arms, and tow pulleys (to be used later).

Step 6: Put Pieces Together

enter longer description for this step

Step 7: Attach String and Rubber Bands

enter longer description for this step

Step 8: Attach Arms and "bowstring"

The bowstring is made by connecting about 6 rubber bands together on a string, and making a loop by tying the two ends together.

Step 9: Loading the Crossbow

This may be difficult at first, so point it downrange, so to speak. Two shots can be loaded side by side.

Step 10: Adjustable Power and Sharpened Ammo

Adjusting the power is done by moving the arms forward on their hinges, and locking them in place using the four extra pieces.


A pencil sharpener easily sharpens the tip of the ammo, but the blade dulls faster.

*Note: Caution is strongly suggested when using sharpened ammo. It is not recomended to use sharp ammo on your first try, or at anything living.

*Also note: If you didn't figure the first warning out already, it is suggested that you permanently dismantle the crossbow.

Comments

author
babygotback (author)2010-08-24

looks really cool

author
knex freak101 (author)2008-03-02

thats pretty much the same as gorkem's crossbow.

author
Whaleman (author)knex freak1012008-03-25

'Cept that it was posted about 7 months before.

author
KnexFreek (author)Whaleman2009-09-23

lolz

author
antonk (author)2008-07-12

looks like a bow

author
(your name here) (author)antonk2008-07-12

The bow part is kind of for show, and to make it a crossbow (not a spear gun).

author
ojochris (author)2008-04-20

looks like a wrist rocket to me...

author
Dragon X (author)2007-08-04

There is too many knex cross bws pistols and rifles

author
phlorgan (author)2007-07-20

u r so sad... this is depressing. if all ur gonna say is that then bugger off!

author
phlorgan (author)phlorgan2007-07-20

crossbow looks good but im not into (cross)nows that much and am having a break from guns for a while... perhapse mod my rc car...

author
Danny A (author)2007-06-18

Will you stop typing this. it is annoying.

author
Yaano (author)2007-06-05

if you think thats cool wait till you see my bow literaty its a bow not a crossbow im 13 and i have 5 bows 1 dimond 1 mathews 1 hoyt and the other 2 are to small i will post bit idk if my mom will let me

author
knex noob (author)2007-05-22

looks cool, just how far does it shoot?

author

At least 20 ft.

author
Knex Lego Maniac (author)2007-01-09

looks good how far does it shoot?

author

can u check out my gun its not that good but still please

author

It depends, but using standard rubber bands it can shoot at least 20 feet.

author
bunduk (author)(your name here)2007-02-05

I love it!!!

author
Kaiven (author)(your name here)2007-01-12

hey, could you make a heavy srossbow that shoots only one? i think i like single shots better for some reason...

author
(your name here) (author)Kaiven2007-01-13

This model can shoot only one at a time. It just has the ability to shoot two or one at a time.

author
Kaiven (author)(your name here)2007-01-15

oooh...nice. ill try to post a picture if i make it.

author

cool never tired making a bow what r some of the advantages if any over a gun?

author

More control (like a manuel versus automatic), the readily-adjustable power, ability to fire heavier ammo (to lob it) or costom ammo without redesigning the launcher, and, of course, style. I also think that the direct transfer of energy, unlike a firing pin, is more efficient, giving the ammo more power per rubber band.

author
RazerM (author)2007-05-15

This is a great design and put a dent in my wall. I modified it a lot by using grey rods instead of red rods; made the bow arms longer and I also changed the bow to swivel to the back to make loading easier, then the bow can be pushed to the front and locked into place.

author
Wicky (author)2007-05-09

I've made a cool crossbow aswell and i've submitted the instructable. In about 4 days I will add pictures of the trigger aswell.

Picture 038.jpg
author
knexballer08 (author)2007-04-18

looks good, i'll try it out

author
crapflinger (author)2007-01-09

now if someone could figure out how to make a compound crossbow (though your method for adjusting the tension is nifty as well)..

author

I have developed a version of this crossbow that uses pulleys and only one large rubber band.

author

planning on posting it? i think that would qualify as a "new design"

author
Mepain (author)2007-01-09

how do you make the bowstring?

author
(your name here) (author)Mepain2007-01-09

By tying rubber bands together, and use string to finish the loop.

author
oodalumps (author)2007-01-09

I like your stuff, always original.

author
crestind (author)2007-01-08

A great design! More than a rubber band strapped to a horizontal bar and labeled a crossbow.

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