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Seen many times, but only on screens. Wrist-mounted crossbow. Wasnt prepared for such a "rush", so I have no real steps.
But I have a drawing, showing how to make the tigger-mechanism...
Short list of materials
Lath Spring-steel 15 x 0.5mm
Nut Brass
Bolt-rest Teflon (any other plastic or metal will do as well)
Crossbow-section Aluminum
String Steel-string / Bowden-cable
Trigger-string-guides Teflon
Bolts 3mm Carbon tubes
Bolt-tips 1mm Steel-sheet
Housing/Shell 1mm Aluminum-sheet
Aiming-laser Red 4mW module, powered by 2 AAA cells
2 steel springs set back the mechanism. All you have to do, is putting the nut back in place. The mechanism snapps back, and is ready to fire. Cocking the string and placing a new bolt only takes seconds. So the rate of fire is not that bad at all :)
For more gadgets (laser, electromagnetic guns) visit my site: WWW.LASER-GADGETS.COM
Glad somebody FINALLY took that as INSPIRATION, NOT asking for detailed plans.
In all honesty, I don't think that I'd find detailed plans all that useful. The basic mechanisms are all fairly visible (Don't get me wrong, your version is still gorgeously complex), and with a lot of MacGyvering someone could probably make a less sophisticated facsimile just by watching the parts interact in the video. The only tricky part would be the trigger mechanism, which you have handily provided a diagram for.
Check out www laser-gadgets com and hit the request button.
But I thought of that when I was done actually :)
(besides the bandsaw of course)
Material was maybe 100 Euro.