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This frame can serve as the backbone for almost crossbow and can handle several different arm styles, "barrels", and trigger mechanisms. Feel free to use the designs I have or create your own (please post instructions for those as well).

Step 1: Make the Front of the Crossbow

The front of the crossbow is designed to give many points to attach the arms of the bow to, allowing you some freedom when designing arms for it.

NOTE: The 2 connectors are light gray (2 connectors).

Step 2: Making the Body Sections

Feel free to make the crossbow as long as you wish. Make sure that the last body section uses the dark blue connectors.

Step 3: Reinforcing the Frame

Step 1: Make as many of these triangles as you have body sections

Step 2: Just a reminder that you use orange connectors in every triangle except the ones at the front and back (You should have red connectors on top in each one--my mistake while taking pictures)

Step 3: Again, make as many of these as you have body sections

Step 4: Attach the reinforcing triangles with yellow and red rods (or whatever works for the length you chose)

Step 5: Connect the white circles with yellow rods, going through each triangle. Note the tan clip at the very front of the bow

Step 4: Some More Reinforcements

Step 1: Make this rail

Step 2: Attach the rail to the triangles, and put the end with the tan clip at the back of the frame

Step 3: Just another picture to help you see where the rail goes

Step 5: Frame Complete!

At this point, the crossbow frame is complete. It is up to you to design and build arms, barrels and triggers that you think are effective. Please post links to these instructions in your comments. In about a week or so I will post some of the components I have built.
Thanks dude I'm Building it right now =D<br/>
ca u plese show how 2 build the arms? thank u. = )<br/>
arrrrg i used normal string as u did but wen i try to fire it the draw is sooooo weak that wen i pull it goes all the way back and wen i let it go nothing happends its the sam with syprans crossbow pls som one help me pls reply pls!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
here. this is one of the best crossbows i have built. But instead of using string, us a rubber band.<br/><br/><a href="https://www.instructables.com/id/Knex-light-crossbow/">https://www.instructables.com/id/Knex-light-crossbow/</a><br/>
add an rb on the arms so they r pulled together
ive made a universal frame but alot smaller... and it can be modded to a crossbow, or any other i cant really think of a word for it.... but BOW - ISH instrument of arrow shooting =/.....<br/>Sadly i cant post and i will give it to my friend to post... =)?<br/>
looks weak lol
cool mine shot 4000ft because i am rich
bull!
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nice frame im ganna use it as a simpler version of wikys crossbow
ooo it can use a more spimple version on my cross bow... yay!
how do you load and fire it
not terribly bad but good for a first instructable first comment

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