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A semi automatic rubber band mechanism
This is my semi automatic rubber band mechanism for my guns. This shows how it works.
About this creation
Here is a layout of the mechanism from the side. Its crude but it will help you.

This is when the whole cycle has been completed. The bar is returning to the normal position.

This shows a band on the bar with the trigger pulled back. Notice the bar has been stoped by the L shaped black bar again.

This is another shot of the second photo only with a little more detail.

Ok, since many people asked for directions on my mechanisms I am posting this page to help you use mine. If you use this in your guns, please give me credit. Thanks. Now the top picture shows the original position that a rubber band would be loaded on to start. The black "l" shaped bar is controlled by the trigger and stops the grey loading bar from moving forward. as you pull the trigger back the bar will hit the frontside of the "l" shaped bar stoping it from rotating all the way around. Then as you release the trigger the bar will move back to the original position. You can reload the gun by putting a band on the bar then rotate the bar backwards while pulling the trigger. The result will be two bands can be put on. You can do this for about 10-15 bands. This is a very simple ratchet mechanism. If you don't understand it please email me or comment below. Also, there is a cool example of this mechanism from Siem Pietersma at that link. Although its not exactly the same, it will give you ideas on how you can use it!







Comments

Weston Wedeward
 I like it 
chris legg
  July 29, 2010
the space between the L and bar is 3 bricks and 1 tile block the back of the L piece so it does not swing at wrap a rubber band on it so it snaps. also make sure the bar can fully rotate and test the trigger if it does not work it may be wrong. i love this mech, you don't need to worry about what "gear" to put it on. i also modded it into a bolt action and pump action mech.
 I like it 
  July 28, 2010
im stumped i need this for a skorpion but i cant work it out mabey a step by step intructions are in order
Weston Wedeward
 I like it 
chris legg
  July 7, 2010
Rob Hanson (http://mocpages.com/home.php/24659) used, almost this exect same mech on his gun (http://mocpages.com/moc.php/186962)
 I like it 
  June 30, 2010
can you please make instructions for this mechanism? just the mech please, thanks :)
Weston Wedeward
 I like it 
chris legg
  June 25, 2010
i used your mech again
Weston Wedeward
 I like it 
chris legg
  June 25, 2010
ity did but i only have one rubberband for it. it already up on my acr
 I made it 
  June 25, 2010
Quoting chris legg i used your mech again
Great! I hope it works well for you as it has for me...
 I like it 
  December 1, 2009
I don't get how to make it... Please post step-by-step instructions or a LDD file please, and this may be the first semi-auto mech that I can make! If so, I will use it in my pistol, and give you credit!
  September 5, 2009
looked at your video. pretty much all i needed to build this.
Weston Wedeward
 I like it 
chris legg
  August 8, 2009
wait i'll have a new gun with this mech soon
Weston Wedeward
 I like it 
chris legg
  July 13, 2009
great (note i'l might use it) but if you kept pulling the trigger would it be automatic?
 I made it 
  July 13, 2009
No, if you just held the trigger the bottom of the "L" part would stop it. But, if you pulled it really fast, maybe it may be like and automatic, but it really wouldn't be.
 I made it 
  April 9, 2009
Quoting Andrei Rozhin nice mechanism dude. But is it high capacity because i need a mechanism that can hold 8+ heavy rubber bands.
Well this mech is not probably the best to hold that many heavy rubber bands due the the fact that it is not geared down. In theory you could put an infinite amount of bands on but in reality the stress would eventually get to be too much.
 I like it 
  April 9, 2009
Can you please make a cross section? I tried to make this before but the trigger pull was huge.
Weston Wedeward
 I like it 
Andrei Rozhin
  March 19, 2009
nice mechanism dude. But is it high capacity because i need a mechanism that can hold 8+ heavy rubber bands.
 I made it 
  March 18, 2009
Quoting Jongejanssie Jongejanssie Uhm, Marder, I'm stuck on a problem. When i use this mechabism, it holds only 7-8 rubberbands. And for the "l" shaped bar, i use a 5-holes bar, instead of 7-holes. Can that be the problem?
JJ, I prefer the 7 stud wide bar. It allows more rotation. Also, The gun has a max capacity of 12 light rubber bands. So don't put more than 5 heavy rubber bands on. I am trying to work on another mechanism as simple as this. I don't want to use gears but I may have to.
 I like it 
  February 28, 2009
Uhm, Marder, I'm stuck on a problem. When i use this mechabism, it holds only 7-8 rubberbands. And for the "l" shaped bar, i use a 5-holes bar, instead of 7-holes. Can that be the problem?
 I like it 
  January 23, 2009
ha ha. thats pretty cool! try some side pics of the inside?
 I like it 
  January 23, 2009
Excellent mechanism! The way you use the mechanism, doesn't make it explode! So it's very easy to make a rater big capacity! Nice job!
 I like it 
  January 22, 2009
Ahh... now i get it. Thanks!!!
 I like it 
  January 17, 2009
I would love to use it for my next sniperrifle but... I DON`T GET IT!!! Could you please make a movie with the instructions, PLEASE??? btw it looks pretty good.
 
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LEGO models my own creation MOCpages toys shop A semi automatic rubber band mechanismWeapons


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