Introduction: SA 3252 V.8.5

Picture of SA 3252 V.8.5
The latest in a long, long project. Well, here's what's new;

-This version has a structural core that absorbs all energy from the firing elastic (it transfers the energy through trigger blocks), preventing the mechanisms from being burdened with a greater load than they can handle. This should make the gun capable of handling the largest elastic that I own.

-Totally redesigned structure and mechanisms that take up less space and are much more stable than the previous version.

What stayed the same;

-still uses an alternating trigger mech

-still is powered by an elastic spool

-firing pin and crank are still basically the same

My short term goal is to make this fire gray connectors 30-40 feet semi-automatically. My next goal is to make it fire yellow rods 50 feet. After that, I want to make it into a semi-auto shotgun that will fire 3 yellow rods at a time 50 feet (using KILLERK's new shotgun system). That last one may or may not be my final goal. A fully automatic system is hypothetically possible with the amount of torque that I'm now dealing with.


shieldsam (author)2012-10-24

Uhhh... No offense, but what is it?

Oblivitus (author)shieldsam2012-10-24

Lol. No offense taken. It's a semi automatic gun.

Sharir1701 (author)2012-07-31

you know, i'm looking at this now, at the comments i made only just a year ago below, and i feel so stupid, plus, i see this old thing and see just how fossilly it is compared to what i have today. i was always fascinated by this concept, you know. i don't think i ever told you, but before i begun work on it with you, i did make a nice little gun that worked, semi automatically, had about 8 shots, and was 5 layers with no paper. there was only one axle - the pin axle, and the trigger i described below was blocking directly on that. it shot about 6 feet, and i can tel a lot of things i didn't know about the concept back then, that i know now, how to make it shoot at least 25 feet, and it was much much smaller than what i have now too. also, i like how you said up there that you want to make it shoot grey connectors 30-40 feet, and then yellow rods 50 feet, and then multiple yellow rods a similar range... lol. i had to laugh like 10 times when i read some of the stuff here.

Oblivitus (author)Sharir17012012-07-31

It's amazing how far you can come in a year isn't it? I know I've come a long way too. And do you see how much this project has expanded your understanding? I know it has mine. Lol, yes, I have to laugh at what I was saying last year too. But at the same time I'm now wondering if maybe those lofty goals are in fact possible. But even if they're not, setting goals like that is exactly how I got the drive to start this project and keep going with it. Set your ultimate goal at infinity and keep making checkpoints.

Sharir1701 (author)Oblivitus2012-07-31

yup. totally. i know stuff now about this concept in particular and knex in general that i had no idea about a year ago. lol. i don't think the 3252 will ever be able to fling yellow rods more than 10 feet, because of interlocking, and because of their weight. if there's not enough drive in the first place to get it out of the gun, which i think the 3252 concept will never have, it will never be good enough. if you invented some way to automatically separate the rods, like shells or something, maybe, but i still don't think it's possible. as always, glad to be proven wrong, though.

Oblivitus (author)Sharir17012012-07-31

Yeah, and not just knex, but physics, engineering and the process of designing something. Oh interlocking is no problem. I'd just use a TR-18 turret. And if a stronger version of the alternating mech were made that could hold a really thick elastic than it is possible within the scope of the physics at the very least. Remember that you once said that 5 layers was probably impossible?

Sharir1701 (author)Oblivitus2012-07-31

yup. well, you would have to get some really really good and REALLY REALLY long bands, but i think the alternating trigger can hold whatever you want. what i do think is that the two cogs in between make it weaker, so you would want to have only one cog in between, or even, if possible (which i doubt would be without losing a great deal of power), no cogs in between. have the trigger blocks block directly on the pins axle. yeah, i suppose it would be possible. it would also be massive, because you would need to have a large space for the rubber band to go, even if you loop it around a few wheels. it would also probably use a butt load of wheels. it would have many practical disadvantages for us builders and users, but it would be possible, physically. lol, so what's your other concept?

Oblivitus (author)Sharir17012012-07-31

Okay, let me pitch my new concept to you then. It contains one black rod firing pin with a TR-18 turret feeding it yellow rod ammo. There is one elastic on the firing pin that will be just strong enough to get 50 feet of range. There will be a cog that releases elastics (like in an RBG system), each of which will cock the pin and fire a yellow rod 50 feet. That means that the RBG cog elastics will need to be at least a little stronger than the firing pin elastic, which won't be all that powerful anyway. It's actually a bit like what Kinetic is doing now in that it uses an RBG cog.

After you bringing up my old claims, I'd almost like to try to make a really powerful version of the 3252 to fire yellow rods like I originally wanted to though instead. You know?, make the high powered laser gun.

Sharir1701 (author)Oblivitus2012-08-03

i just wrote a page long comment response, and when i clicked "post comment", it said my session timed out or something, as in it logged me out, so my comment is erased. UUUUUUUURRRRRRRRGGGGGGGGHHHHHHHH!!!!!
in short, what i said was i have a much better idea how to do this concept, and i know exactly what you mean. it's been done before, don't remember who, what, when, why, where (lol), but i have an amazing idea combining the TDAC concept (auto chambering bolt action), kinetic's or innovanna's (depends which one is better) removable rubber band ratchet, and possible a removable bullet magazine (if possible). that would get over 80 feet thanks to the bolt action, and would be extremely reliable and fast. my idea to make it a lot better is to have a weak rubber band pulling the ram back, and have much stronger bands pulling the ram forward (on the cog). i know how to do it too. i'm really enthusiastic about it too.

i don't need the drawing for this concept, but i'd be glad to see the other one you said you had.

about the 3252, i had a really long response to that, but never mind that. i'll just say that i think i've done everything i can with it atm, and i'm posting mine, so everyone and you can build it and see how it's built. i'm gonna try the other concept now (let's call it RBP, for rubber band pin). about the yellow rods, i give you the building stick (lol, kidding). you can do whatever you want, i'm leaving it alone for now. i think the best way to have yellow rods (maybe think about shells as well) is a TR-18. actually, now i think about it (unless you can get it to have 18 shots), it would be smarter to have a smaller turret on that (or maybe you could find a way to temporarily move the turret aside while your cranking the thing again). i trust you to figure it out, but i'm moving to the other concept, and i'll keep you updated.

P.S. this time i'm copying the comment so that if it happens again, i'll just paste it. thank god for the copy-paste.

Sharir1701 (author)2011-09-11

since i've heard you're dropping this project for now, and i had a great idea how to make it potentially work better, be 5 layer (with a crank sticking out the side) and not 18 layer, or whatever it is your's is, and rid the gun of the alternating trigger mech you made and replacing it with another trigger mech i have already constructed and checked, but i don't know how to call it, it's bassically like 2 trigger blocks one in front of the other. by default the front one is up and blocking while the other isn't blocking. when you pull the trigger, the front one goes down to stop blocking and the back one goes up to start blocking. when released the process reverses itself. after a whole repeating of this (1 trigger pull) the mechanism will let the ratchet attached to the crank rotate 180 degrees to hit the bullet and go back to being blocked by the trigger.

my big question is: can i take your concept and work on it, and hopefully come to good results and publish it, of course giving you credit?

Oblivitus (author)Sharir17012011-09-15

That trigger probably won't work when you get the spool up to firing speed. That's how my first semi-auto trigger for this gun worked. The problem is the reset time. The spool can make a rotation or 2 before the block pops up. That's why I designed the alternating trigger mech, it has no reset time between blocks. I haven't seen your mech though, so I don't know for sure.

Sharir1701 (author)Oblivitus2011-09-15

then i probably didn't explain my trigger well... physically, the ratchet that fies the bullets cannot complete the 180 degree rotation before the trigger is released.

Oblivitus (author)Sharir17012011-09-12

Yes, go ahead. That's great! I was getting low on ideas anyway. It would be great to have some fresh ideas and approaches on it. If you want to post it, go ahead, as you said, with credit.

Sharir1701 (author)Oblivitus2011-09-14

thanks. i hope i'll get some results. i've already got a not bad trigger mech and a pretty good firing piston, i'm working on the mag, barrel and trigger right now.

MegaMetal8 (author)2011-08-06

Wow. Complicated

Oblivitus (author)MegaMetal82011-08-06

Yeah, it's time that knex guns came out of the dark ages and had a renaissance. :)

MegaMetal8 (author)Oblivitus2011-08-07


Oblivitus (author)MegaMetal82011-08-07

Does that mean "me too"?

MegaMetal8 (author)Oblivitus2011-08-07

It means I agree. For example if you made statement and many people agreed you could start a chain of +1,+2,+3 etc from all the people who agree.

Oblivitus (author)MegaMetal82011-08-09

Ah, okay. +2

Sharir1701 (author)Oblivitus2011-08-14

+3. oh, and i love almost all your work man. you inspired me to start building my own guns. in fact, i am now awaiting a very large piece order. in the meanwhile i'm searching you'r concepts pages to find some good ideas for my guns. don't worry i'll give you credit if i publish them. anyway, you are a real legend and knex god, at least to me... i don't know what the rest of the knexing world thinks.

Oblivitus (author)Sharir17012011-08-14

Thank you, it means a lot to me when someone is inspired by my work.

Here are a couple of concepts that you may want to look at;

33-34F19: SS10 Shotgun: Uses a slingshot mech to fire 10 green rods lined up on their sides. The rounds add up to about the same weight as an SRv2 bullet. I'm guessing that this gun can get 30-40 feet of range. -By Oblivitus

38F23: Slingshot Shotgun: A slingshot that fires several rods from a box. To load the gun, you cock it by pulling back the box with handles (one for each hand), then drop several rods into the box and pull the trigger to fire. The box has guides sticking out of it that go into slits in the gun. The bottom guide is stopped by the trigger when cocked. -by Oblivitus

The second one is a little better, but also a little harder to build. You may find another one you'd prefer to make though. Whatever design you decide to go with, just make sure it matches your skill level.

PS: Which work don't you like? Just kidding, haha.

Sharir1701 (author)Oblivitus2011-08-28

i decided to go with making a bullpup that has it's trigger block behind the magazine, something i have never seen in k'nex. my idea is to make the trigger pull a seqeunce of mechanism's connected to each other that convert one type of movement into another in order to go arround the magazine, where it is converted back to the first type of movement. i hope i explained my self, and if not, you'll probably be seeing it soon when i upload it, after finishing it.

Oblivitus (author)Sharir17012011-08-29

Sounds good. But bullpup's have been done before. Unless you're coming up with a new type.

Sharir1701 (author)Oblivitus2011-09-10

i believe it is a new type... I've never seen it before, and it is extremely strong (134 ft with 2 thick bands), extremely comfortable, and is designed for optimal handle-stock distance, and optimal total length. also, there is no barrel in front of the handle, because the barrel is over and behind the handle, making it also an awesome assault rifle.

Sharir1701 (author)Oblivitus2011-08-18

lol. i'm sorry for not naming the correct names and places of the concepts but i already built the mg with 10 rams (and barrels) but one trigger. it came out awesome, just giant and too complicated and i was lazy to post. i also built pump action concept that uses a string and a spool and added it to one of my existing guns. awesome ! by the way i thought of my own concept. i was lazy to make it but i thought about it while building my upcoming gun (undetectable hidden commercial, expect a new gun from me before summers end), and here it is:

build a Bi-Pod mech and connect the two legs with a lot of bands. on one of the legs, at the bottom add a stick (ram) that can't move. on the other leg, make a bullet holder and put a bullet in. the idea is that the Bi-Pod legs are drawn together with a lot of force, because of the rubber bands, and then, the bullet kinda hits the ram, but since the ram can't move and the bullet can, and the legs are tying to close, the bullet is shot. now the idea is that the Bi-Pod will have a rod between the legs, on which there will be a little box attached to both legs, going up when the legs close, and down when they open. you put a block trigger that prevents that from going up, insert a bullet (after you've opened the legs of course), pull the trigger and watch my new concept in action.i hope you understand my concept, and if not, i hope some else will explain it to you better than me. pics:

Oblivitus (author)Sharir17012011-08-21

I'm having a hard time understanding this. I'm pretty attention deficit, so things have to be clean, concise, and well organized in order for me to understand them. Can you give me a single sentence explanation of what it does? And then explain in numbered steps each phase of its operation? My brain can't process disorganization.

Sharir1701 (author)Oblivitus2011-08-28

i'll try to make my self clearer...i know i'm very messy in my explanations.

the 2 legs are pulled together by a vast power of elastics after the trigger block is pulled away from the mech by pressing the trigger. this causes the preloaded bullet on one leg to eject at a high velocity after hitting the stable, non-moving rod that is used as a ram on the other leg because of the speed at which the front leg with the bullet comes down at.

the operation of this mech is as follows:
you pull the legs apart, up to the level where the trigger block starts blocking.

you insert a bullet into the bullet holder on the front leg.

you pull the trigger.

MegaMetal8 (author)Oblivitus2011-08-21

Thats it ;)

Sharir1701 (author)2011-08-20

what i don't get is why you need the alternating trigger mech. why not just 1 trigger mech that'll always work? i hope i don't come out stupid or nooby or anything....

Oblivitus (author)Sharir17012011-08-21

No, you don't sound stupid or nooby. It's an all new mechanism.

Okay, so, it needs it because one block wouldn't be able to to pop up fast enough to stop a spool spinning that fast. Therefore, if you have two of them, one of them will always remain blocking. That way, reset time of the block doesn't matter.

Sharir1701 (author)Oblivitus2011-08-28

oh nice... i never would have thought of that.

Oblivitus (author)Sharir17012011-08-28

Thanks, I came up with it out of necessity though.

~KGB~ (author)2011-07-31

looks good, a video would help explain it lol

Oblivitus (author)~KGB~2011-07-31

I just posted a video of it.

~KGB~ (author)Oblivitus2011-07-31

nice =D

Oblivitus (author)~KGB~2011-07-31

Get it now?

~KGB~ (author)Oblivitus2011-07-31

yup. im posting an MG tomorro, it uses a really cool trigger mech =D

Oblivitus (author)~KGB~2011-07-31


~KGB~ (author)Oblivitus2011-07-31


Senior Waffleman (author)2011-07-30

Can you post a video of it in action?

As you can probably see, it's not firing yet. But yeah, I can make a video showing the movement of the mechs if you want.

Sure thanks :D

I just posted a video of it.

tytiger33 (author)2011-07-30

A bit too bulky right now. Does it still use spinning wheels to fire a shot?

Oblivitus (author)tytiger332011-07-31

I just posted a video of it.

Oblivitus (author)tytiger332011-07-31

It uses a spinning white connector that hits the bullet with a small green rod. It has to be this bulky to hold a large amount of pressure.

beanieostrich (author)2011-07-30

This looks cool =D True semi auto =D I can see it being a hard shooter =D

Oblivitus (author)beanieostrich2011-07-31

I just posted a video of it.

Oblivitus (author)beanieostrich2011-07-30

Thanks. Not a true semi-auto, so I'm told, because it has to be cranked after every several shots. Yeah, it'll get more power than a semi-auto powered by a trigger pull though.

About This Instructable




Bio: I paint, write music, and used to build knex guns. I have a Bachelor's Degree in Studio Art. - updated 5/7/2014
More by Oblivitus:Z3 Knex Gun (3-Barreled Semi-Auto Pump Action Revolver)Z3 Knex GunZ3 Knex Gun Firing Demonstration
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