My Gun Design

[viper_ssc]

I got bored the other day and made a gun design. Now I didn't look at any other designs while I was making it so I didn't copy anybody elses design and I hope its not the same as another gun.

Now would this work properly you think? I was kinda worried that the ram shaft would just go forward and not carry the bolt with it so I put a spring between the shaft and the bolt. But I don't know if that'd be enough to hold the shaft back.

EDIT: I changed the design some more, I replaced the sear and put the spring back in because it seems that'd work better. I also increased the size of the air chamber in the bolt, larger volume=less psi needed, I think.

[dyeguy65]

hmm seems pretty ligit.

ive been watchin the animation for like 5 minutes and cant see anything wrong

[doober]

dude!

that is seriously awsome. maybe now u need to try and build it that would be tight.

"Hey wat type of gun is that"
"Oh it's one that i invented and made"
"wat holy crap"

[ojhspyro89]

Only potential problem i see is wear. Where the sear would be lifted, itd wear like crazy if it was aluminum.

Looks like itd work. If there was a way to make it fully pneumatic, itd be cooler

[grant40k]

ya man you could make it like the pnumatic trigger that some ppl do. you could have a 3way for the trigger that conects to the ram. and as far as wear goes just make that thing that holds the ram out of steel it wont add that much weight and it will last a hella long time. pm me if your makin this thing cuz if you dont i will

[Tim Taylor]

What is the point to the sear?

There are still some plumbing and valves required to make that happen.

A spring between the 'hammer' and 'bolt' would do better than the sear.

The 'bolt' would need to move the valve that would change the direction of the 'hammer'.

I think timing would be the biggest issue to making this work. The idea is similar to the operation of an Autococker.

[grant40k]

i think the spring would work better also. it might help chops also

[noahyay]

it will be on my site hope thats ok noahkool.com
i agree with the spring idea. a set of springs= anti chop, you would have to adjust the gun pressure to the spring or air would leak. if you are goign to go with springs you could have the ram be 3 way and have another spring to return the bolt

[viper_ssc]

Ok, I see what you guys are saying, a spring would probably be easier to design the whole thing too so I'll try that and if it doesn't work I'll go to the other design.

I changed the design back to the one with the spring.

noahay- its ok you put it on your site. I'll definately try different springs and see what works and what doesnt and what size and strength I'll need to prevent chops.

Tim Taylor- The point of the sear would be to hold back the hammer until the bolt has closed off the feedneck completley. With the spring I was worried that the hammer might just go all the way open in the beginning instead of waiting until the bolt stopped. So the sear would prevent that but would cause a lot more wear on it.

As for the air lines, I was thinking of setting it up similar to the Freestyle. LP hoses to the solenoid and a larger air line connected to a manifold to deliver the air up to the bolt. I also think I'll use a Freestyle front block and freestyle grip frame for it, since it'd cost too much to make those and those parts look like they'd work good for this.

[Mellow Yellow]

I think I see a flaw. Excuse me for any stupidity presented from here and out. Well, in the ram housing(that's what I'm going to call it) the pressure which moves everything back has to be greater then the pressure inside the bolt or else the bolt would not stay in the cocked position. What I would do is make air enter the bolt once it is fully forward.

Ahh, edit:
Also, the pressure in the bolt might actually push the seal out before the bolt is all the way forward. So.. In a design like that you would need a very heavy spring, and a good bit of pressure returning, and pushing the bolt/ram.

How wrong am I?

[viper_ssc]

I think I see a flaw. Excuse me for any stupidity presented from here and out. Well, in the ram housing(that's what I'm going to call it) the pressure which moves everything back has to be greater then the pressure inside the bolt or else the bolt would not stay in the cocked position. What I would do is make air enter the bolt once it is fully forward.

Ahh, edit:
Also, the pressure in the bolt might actually push the seal out before the bolt is all the way forward. So.. In a design like that you would need a very heavy spring, and a good bit of pressure returning, and pushing the bolt/ram.

How wrong am I?

This is what I was thinking when I put the sear in there instead of the spring. So I may have to use the sear instead of the spring. That way unless the pressure in there is enough to break the sear then it won't open it before it's supposed to. But then I have a lot of wear on the sear thing and the body. I have a few more ideas with detent type things I'll see what would work. But I can't have it too complicated considering I'm only 15 and have very limited resources.

Now I'm drawing a non moving model pretty much to actual size so it's easier for me to make it.

[viper_ssc]

Ok, I've drawn up a full scale model of it and think it should be relatively easy to build. I'm gonna order the materials soon, first I'm going to build the bolt design and then buy the aluminum for the body and cut the body. I'm going to leave the spring in there even though the problem that Mellow Yellow mentioned could happen.

But I figure, correct me if I'm wrong, but if the spring is hard enough it will need a lot of force to compress it. The bolt will slide smoothly in the gun and will require much less force to move it, so it should slide the bolt forward instead of compressing the spring too early. Am I right in thinking that?

[ScatterPlot]

Hey, what program are you using to make those gifs?

[viper_ssc]

Macromedia Flash MX

[ScatterPlot]

Heh, good design BTW. Been looking at it and only 2 "issues" I can think of. 1 in the drawing, 1 in operation. They're all real minor-I think it's a great design.
1-operation- It COULD be kinda hard to get the air chamber to seat well around the actuator rod thingy just to the left of the spring. Putting orings in holes is not fun, especially in really teeny ones.
2-You drew it pretty big; you could really probably condense this down to be shorter. You upped the size of the air chamber, but what you could actually do would be to just widen it after the most left actuator seal. This would allow an overall shorter design.


I'm sure you thought of this, but for the stop on the top of the bolt you could just thread a hole to keep from having to make some weird parts. Also, are you planning on testing this thing out at all? Cause I have a small mill and lathe I'd like to try it on sometime.