Knex Bow

this a knex bow but it has a difference between most others, it's arms are rods not connectors.

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: Parts

these are the parts you will need to make this bow.

1 grey rod
2 orange connectors
3 red rods
1 red connector
6 yellow connector
2 grey connectors
1 yellow rod
10 green connectors
12 green rods
10 white rods
1 doubled up rubber band

Step 2: Making the Skeleton

this the skeleton of the bow.

Step 3: Making the Bow Arm Supports

these are the supports. this is a critical part of the bow, they prevent the arm form snapping off.

Step 4: Finishing the Bow Arm Supports

these are the finished bow arm supports.

Step 5: Attiching the Bow Arm Supports

this is how the bow arm supports are attached

Step 6: Adding More Support

this is also needed or the middle of the bow will bend

Step 7: Finishing the Mid-section Supports

this is the mid-section supports finished. do this on both sides.

Step 8: Making the Arrow Track

this is where the arrow will leave the bow, also, it stabilizes the arrow. what side you put this on depends if you are lefty or righty.

Step 9: Put the "bow String" On

have two rubber bands and double them up using a slipknot, then slipknot both ends to the two grey connectors,one on one end one on the other the attach them to the bow arms. congrats your bow is done now to make the arrows.

Step 10: Making the Arrows

to make the the arrow use the grey rod and the remaining red rod and connect them together using the orange connector and then connect the other one to the end of the red rod.

Step 11: How to Fire

to fire put the arrow(red rod against the rubber band)in the track.then pull back and fire.

Be the First to Share


    • Book Character Costume Challenge

      Book Character Costume Challenge
    • Made with Math Contest

      Made with Math Contest
    • Cardboard Speed Challenge

      Cardboard Speed Challenge

    33 Discussions


    7 years ago on Introduction

    Looks very flimsy and not very powerful, I would advise that you either reinforce it or make it much larger to give it more power.


    8 years ago on Step 11

    i have been searching the net all afternoon and i struck gold when i found this . awsome bow


    11 years ago on Introduction

    hi . havent been on here for a while but i came up with your bow and sorry to say but it isnt that nice never use rubber bands as string use a rope and use rubber bands on a mechanism in the front to shoot it it will shoot way further and that way you can make the frame stronger so you can pu on more rubber bands + you can make it reltime size if anyone wants it i can post it again sorry for the comment (nice effort btw)

    3 replies

    Reply 11 years ago on Introduction

    I'm not sure exactly what you meant, but I think your rope-rubberband system refers to compound bows. Of course, don't put too much faith in me; I know nothing about toxophilite's jargon >_>


    Reply 9 years ago on Introduction

    He means one of those fancy pulley-operated bows made of metal. That way, the bow can shoot with more force with less strain.


    10 years ago on Step 11

    when I pulled the arrow back to fire it, it snapped and flew into my eye, it hurt like hell. do have any improvements to stop this from happening

    3 replies

    Reply 10 years ago on Step 11

    I'm sorry to hear that but if you read the comments you would notice I made a mod that is an orange connector with a gray rod on both sides. Hope that works better for you


    10 years ago on Introduction

    you wrote a the start that most otherbows used connectors for arms this is because the are stronger and will not snap. it was a nice idea but is very impracticical.


    11 years ago on Introduction

    I built this thing and the arrow kept flipping off to the side wtf!


    11 years ago on Introduction

    ULTI-FRIKKIN-MITT EXPLOSIVE ARROW: Get 5 orange 2-slot connectors, stick them together, WITHOUT RODS, then on the end, put a 3-slot red connector. Slide the orange connector through the bowstring on one slot, and pull back, release! I AM NOT RESPONSIBLE FOR WHAT YOU DO!


    11 years ago on Introduction

    Im new here but ive known about this site for a while so just a little note. Anyway about the arrow, wouldnt it work better if you made it with just one grey stick? Because the connecors make little bump-type-things when you stick them on to a rod. I know that you would have to still have one connector, but two would make it bump up even higher wouldnt it? And a suggestion, you could put a red connector on the stick to make it look like it has an arrow head on it... Even if it only looks vaguely like that its still kinda nice.


    11 years ago on Step 11

    Yeah I would Love too See How Long it goes Though...


    11 years ago on Introduction

    Yay its good, without that many pieces too! But if you make the arrow with two grey and one red, I think, it works better.