Semi-auto lego rubber band gun

Semi-auto lego rubber band gun
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This is a semi automatic Lego rubber band gun that can also be easily changed to auto.. but then with rubber band guns semi automatic is more of a challenge to build- here's how I built my trigger mechanism... this is my remake of it that contains step by step pictures i hoped could be comprehended.. contact me with questions of comments please! =)
see it in action here : http://www.youtube.com/v/-8ly4yEf0Io&hl
 
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Step 1The main ideology behind the mechanism

The main ideology behind the mechanism
ok so basically the way this works is mostly all int he gears- I have it geared so that whenever a rubber band is released (only one) the "trigger wheel" (grey beam in the middle of the sideways v) spins only once. so in other words one rubber band=one trigger wheel spin. Then the "trigger" (purple bent beam) is connected to a sort of ratchet mechanism that when I pull the trigger back it makes the ratchet release the trigger wheel which the rubber bands put enough force on to release one. Also I have a rubber band connected to the trigger (the trigger is just connected directly to the "ratchet"or "v" (because it wouldn't fit on the inside of the trigger frame because the two gears that hold the bands are there). soryr this isn't more detailed but if you ahve any questions feel free to ask.
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46 comments
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Jan 27, 2011. 6:58 AMfelix minowa says:
cam I use a little...engrenage?
Aug 8, 2009. 9:45 AMGamer917 says:
i have a full auto rifle thats amazing for lego wars (kinda like knex/nerf wars but with lego guns)
May 17, 2010. 6:47 AMbobthegelatnisman says:
(note for future guns) ferret2992 first off you shouldnt leave the gun open or bable to c the rubber bands as when you are havig a war sum1mite hit the bands with 1 of theirs possibly letting the ammo fly off and getting shot repeated times at close range and with a powerfull gun (like my friends gun) so ya and if they are closed in they are less suceptible if they are enclosed and use a clip that holds bricks as shooting bricks is much more acurate(c my gun vid below if i can figure out how to post it) haha
http://www.youtube.com/watch?v=xVkBwiSxUxQ
Jun 6, 2009. 12:40 PMkill1234 says:
try to upload them 1 at a time
Dec 6, 2008. 5:55 AMpineapplenewton says:
if you can only make it move a minimum of like 3 notches just put rubber bands every third one.
Mar 28, 2009. 12:40 PMalester27 says:
i can't get it to work, and i can't understand the directions.
Jun 20, 2008. 1:18 PMfurferret says:
lik wen r goin post the more detailed one; ru goin to be posting it a few days, weeks or wat! p.s. can you show it with different gears i have the big one but the 3 smaller ones, maybe the ones from a bionicle ?
Jun 19, 2008. 3:04 PMfurferret says:
how do u load rubber bands !
May 1, 2008. 5:05 PMrafaipod says:
hey where you get the v lego pice
Feb 22, 2008. 5:43 PMknexsuperbuilderfreak says:
and extend the barrel
Feb 5, 2008. 2:01 PMGibson_SG_95 says:
wow you have no idea how long ive been trying to design a trigger mechanisim for my lego gun. i think im gonna use this. thanks
Oct 24, 2007. 4:01 PMMaxaxle says:
The pictures aren't very descriptive, can you post instructions?
Oct 23, 2007. 2:05 PMhatae55 says:
oo00oo im making a semiauto knex gun (thompson smg[body] + colt revolver[firing mechanism]) ill post when im done... Then ill be out of the unposting looseriness :)
Oct 23, 2007. 2:06 PMhatae55 says:
the "body" and mechanism should of read (body) and (firing mechanism) but i used square brackets
Oct 23, 2007. 2:07 PMhatae55 says:
it fires blue rods, not bands but is easily modded for bands
Oct 1, 2007. 5:08 PMnibuoy says:
can you explain how the trigger mechanism works? thanks just wondering
Oct 2, 2007. 3:12 PMnibuoy says:
i've been making rubberband guns, but i can't make i semi auto. you have to reload after every shot. could you explain it a bit more clearly?
Oct 7, 2007. 5:45 AMnibuoy says:
i've got it all down except for the trigger. the v shaped thing doesn't catch the grey beam and all the rubberbands are fired at once
Sep 23, 2007. 9:37 AMi make shooting things says:
it says the vid is unavailable
Aug 20, 2007. 4:56 PMConstructo Man says:
This is kind of off topic, but im trying to post my first instructable and im having trouble with the pictures. I was wondering if anyone else does
Aug 13, 2007. 9:46 AMkoenigseggccr007 says:
I have instructions for a semi automatic lego gun on youtube, this is the link: http://www.youtube.com/watch?v=8G_KFCrGt8k
Aug 13, 2007. 3:50 PMkoenigseggccr007 says:
I know, I should have asked for your permission to post the gun on youtube. I'm srry! :)
Aug 14, 2007. 4:51 AMkoenigseggccr007 says:
that is done!
Aug 11, 2007. 4:48 PMzeero360 says:
yeah that would be good i u could take it apart and send the pics(could u send them to me 2?) sry bout da spellin from me
Aug 4, 2007. 5:42 PMxegghead15 says:
yayayayay some 1 found how to kind of make the lego gum gun
Jul 15, 2007. 11:58 AMnaurtomoe says:
hey i was wondering if you could send me a pic showing all the pieces you need to build the gun..that would be really helpful...send it to samusblastertron92@gmail.com THANKS!
Jul 4, 2007. 10:17 PMItsTheHobbs says:
somtime i gota put my basic lego gun design on, pretty much the same basic idea as k'nex gun, but with legos
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Author:ferret2992