This instructable shows how to create a very simple, yet well-designed crossbow out of Knex. The completed gun will shoot Knex bullets up to a distance of around 50 feet. The design was engineered to be constructed using a minimal amount of pieces, yet be extremely effective and efficient for simple tasks like reloading and accuracy. The design is also durable enough to withstand a bit of rough play, and can be used as a basis to develop more complicated Knex guns.

Step 1: Gather the Necessary Knex Pieces

Below is a complete list of the pieces you will need. As a key, the "Part Name"s are described in the following way:

K'nex [connector or rod] # color

All Knex pieces used in this design are either connectors or rods. This is fairly self-explanatory. If the piece is a connector, # represents the number of rods that piece can connect. If it is a rod, # represents the number of perpendicular connectors the rod can hold.

Finally, color is just the color of that piece. Every Knex piece has a distinct color, so hopefully this is familiar to you.

As an example, look at the piece labelled "1" in the image above. This is a "K'nex connector 1 gray". It can connect to one rod, hence the 1, and is gray.

As another example, the piece labelled "2" in the image is a "K'nex rod 3 white". It can be seen from "3" that 3 connectors can connect to it perpendicularly, and obviously it is the color white.

Finally, "No." is the number of pieces of that type you will need.

No.     Part Name
6         K'nex connector 1 gray
1         K'nex connector 1 tan
13       K'nex connector 3 red
42       K'nex connector 4 purple
2         K'nex connector 7 blue
33       K'nex rod 0 green
12       K'nex rod 11 yellow
4          K'nex rod 18 red
15        K'nex rod 3 white
2          K'nex rod 6 blue
<p>i really like this thanks</p>
Nice thank you i have been looking for the software for mlcad for some time now, and thank you for attaching a link
No problem!
thnk you for doing this it has put ny name back into the comunity thank you<br>

About This Instructable




Bio: Hi, I'm Bryce! I'm a Math + Computer Science major, graduating a bit early. This is my third year at ISU, and I might ... More »
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