Knex Crossbow

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.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

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.

Be the First to Share

    Recommendations

    • Toys and Games Challenge

      Toys and Games Challenge
    • Backyard Contest

      Backyard Contest
    • Silly Hats Speed Challenge

      Silly Hats Speed Challenge

    33 Discussions

    0
    Whaleman
    Whaleman

    Reply 12 years ago on Introduction

    'Cept that it was posted about 7 months before.

    0
    (your name here)
    (your name here)

    Reply 11 years ago on Introduction

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

    0
    Dragon X
    Dragon X

    12 years ago on Introduction

    There is too many knex cross bws pistols and rifles

    0
    phlorgan
    phlorgan

    12 years ago on Introduction

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

    0
    phlorgan
    phlorgan

    Reply 12 years ago on Introduction

    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...

    0
    Yaano
    Yaano

    12 years ago on Introduction

    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

    0
    Knex Lego Maniac
    Knex Lego Maniac

    13 years ago

    looks good how far does it shoot?

    0
    knex boy
    knex boy

    Reply 13 years ago on Introduction

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

    0
    (your name here)
    (your name here)

    Reply 13 years ago

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

    0
    bunduk
    bunduk

    Reply 13 years ago

    I love it!!!

    0
    Kaiven
    Kaiven

    Reply 13 years ago

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

    0
    (your name here)
    (your name here)

    Reply 13 years ago

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