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K'NEX Machine Gun (Does Not Use "Barrel Per Bullet" Design) Answered

How it should (How I want it to) work.

Background: Uses a rack and pinion system to draw back a firing pin to launch projectiles(firing pin not shown).

1. Crank (black rod) will be turned, spinning the pinion, which in turn draws back the rack. First picture shows the racks in default position. They are locked in place against the pinions by the yellow connectors stopping the orange connectors (center).

2. Rubber bands attached to the racks pull them inward, but is stopped by the yellow connectors. Once it reaches the end, the rubber bands pulling the racks will pull them inward suddenly. This will free the racks from the pinions, so turning the crank will not pull back the mechanism any more.

3. Once the racks impacts the front, the force of the impact pushes it against the angled yellow structure, thus resetting the racks into default again.

Basically someone build this so it works well, por favor.



11 years ago

Ahhh okay, I think I get it now! In simplified terms, the pinion's "teeth" (green rods)pull back the rack through it's "teeth" (gray connectors). The yellow connectors keep the rack's teeth and the pinion's teeth touching, so the whole top assembly is pulled back. once those orange connectors clear the yellow connectors, the top assembly goes forward, and then the process repeats. Am I right?

yeah thats right, although I have made a new full auto design, it does not involve a rack or pinion but a canibalised cog and a hammer. At the moment I'm making a browning m2


10 years ago

I had the idea of rack and pinion but couldnt make the rack . You have; well done !

Looking back on this, I overcomplicated it in comparison with bakenbitz's design.

i had some ideas on this that involved using a chain

i have been trying to do this but i can only seem to do it by cutting cogs

well, don't cut cogs, you could just use a cog, then make it so that after a full revolution the cog goes up. You know, like have an orange connector that is somewhat longer than the cog, that way when it gets to that point, the cog goes up, releasing the pin.

I've actually made several adjustments to this design, but it is still too weak to support rubber bands (I don't have time to work on this :/).

Sweet. Do you have a job? I am gonna try and get a job next year.

Not old enough, how old do you have to be to go to college in england? And how old for university? My sister's boy friend just turned 18 a few days ago, and he was in community college, and he is gonna stay there till my sister graduates so they can go to college together. My sister is graduating this year....... I am gonna miss her, but not as much as I like being able to get her room! well, not really, but, whatever

yes, it is generally 18 for college here, but as long as you have your GED, you can go to a community college, which is only two years. If you decide to graduate high school (most people are 18 when they do), you can go to an actual 4 year university (which is the same as a college), and get a diploma, longer if you want a PH.D., and less for a master's degree, i think. There are other types of degrees you can get too, but I don't know them.

Because: you answered me faust answered you i answered faust faust answered me and i posted the pictures to faust. So the trail of comments stemed from you. I get these all the time from you and mepain chatting.

cool. Did you get mepain's 1 nanosecond picture? He went to his homepage a nanosecond after I posted a comment.

Well it uses a rack and pinion, it still needs a better magazine and it is weak but the mechanism works.

Well? Is it done?

I haven't been working on Knex lately.

i have a semi auto gun (true one) that uses this system... it is used in airsofts its nothing new really... but if you already have this, you should make it work with the AST rifle and make it automatic....

This is just to show how it "should" work. Haven't gotten it to work reliably yet due to rubber band issues.

my semi auto seems to work very good with no jamming problems... too bad i cannot post it cause I'm going on a long, LONG trip to south America on this Friday.... ill be back after 2 months.

Does it use the "barrel per bullet" design?

hellz no! it has a mag, 1 firing pin, and some gears..... like is said it works similar to this MG.... only this is semi auto...

Pictures please! So trigger is pulled, fires repeatedly? And it's rack and pinion?

no when you pull the trigger 1 bullet comes our... the full auto is still in work but i cannot give pictures or talk often because like i said, im going on a long trip to south America today, and i will be back after 2 months... until then, i could still talk here trough internet cafe's.

i meant yours is auto and mine is semi...


11 years ago

Ok dude I'm gonna make this because i don't understand it :D

lol very detailed pictures! "carpet fibres" i still dont get the gun youll have to post a vid!.


11 years ago

can u post the pics as a seperate comment since they are already in ur libary

i might beable to figure a way to do that it might of helped if there were pictures

Pictures aren't showing up.