Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 78 users online :: 5 registered, 0 hidden and 73 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

help with bolt-action seal

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

help with bolt-action seal

Unread postAuthor: JDP12 » Mon May 21, 2007 8:15 am

Hey all, well i ordered the stuff for my sniper rifle yesterday, and have been working on my magazine design. I have the magazine figured out, but I'm having a hard time figuring out how to form an airtight seal. details in the picture, thanks guys,

EDIT: I was thinking of just using a couple o-rings on the bolt, and on the barrel, that way even if air did escape, it would have nowhere to go, but just straight back into the barrel, what do you think??? I think it should work, right?


<img src="http://i157.photobucket.com/albums/t79/justhavinagoodtime/boltaction.jpg?t=1179753142">
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: Infernal Maveric » Mon May 21, 2007 9:12 am

You could add a rubber coupling over the bold or barrel.

not sure if it would suffice (SP?) but I know that people have used them for creatoing a seal between a barrel and piston/bolt ECT.

I would be easier (I think) to make the bolt part bigger, as so it goes over the barrel. It can be done by heating it up a few times, as heat = expansion.

hope that helps a little.
  • 0

User avatar
Infernal Maveric
2nd Lieutenant
2nd Lieutenant
 
Posts: 220
Joined: Sat Oct 08, 2005 3:41 pm
Reputation: 0

Unread postAuthor: JDP12 » Mon May 21, 2007 9:24 am

Yea i was thinking the same thing, of makin the bolt part bigger. A coupling wouldn't work though, because of how my breech loader is made, and how tight the barrel is inside the 3/4" pvc-there wouldn't be enough room for it./
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: hi » Mon May 21, 2007 5:09 pm

aghh! that was the post that i made for a breechloader, but nobody could understand the damn thing, so therefor thank you for posting this. anyway, i dont think that it ill matter to much whether or not it has a seal, but to attach it to the chamber, use a union (duh).
  • 0

"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: From_Hamsterdam » Tue May 22, 2007 7:42 am

aghh! that was the post that i made for a breechloader, but nobody could understand the damn thing

I understood your diagram this is different.

Angle the front of the bolt and the inside of the barrel.

-----\ \--------

-----/ /--------
bolt barrel
  • 0

Quote:"What if the Kangaroo's where explosives?"

From_Hamsterdam
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Thu Feb 15, 2007 8:26 pm
Reputation: 0

Unread postAuthor: iknowmy3tables » Tue May 22, 2007 8:53 am

I'm pretty sure that a friction seal between the bolt and barrel will do fine, most homemade breeches are not super air tighit but it's all just flow and not presure in the reciver
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: JDP12 » Tue May 22, 2007 1:22 pm

iknowmy3tables, can you Pm me the plans for your amazing deux ex machina loading system??? I'm working on mine, but the way i'm doin it involves like machining a bunch of crap, which I REALLY don't want to do, and you said yours was machineless, so could you please do that???

Thanks man
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: pyromaniac » Tue May 22, 2007 3:30 pm

ilovetoblowthingsup wrote:iknowmy3tables, can you Pm me the plans for your amazing deux ex machina loading system??? I'm working on mine, but the way i'm doin it involves like machining a bunch of crap, which I REALLY don't want to do, and you said yours was machineless, so could you please do that???

Thanks man


who said that?

o and also my breech loader doesn't have an airtight seal. it works just fine.
  • 0

:pottytrain3:
User avatar
pyromaniac
Brigadier General
Brigadier General
 
Posts: 805
Joined: Tue Feb 27, 2007 7:18 pm
Location: MO
Reputation: 0

Unread postAuthor: JDP12 » Tue May 22, 2007 3:37 pm

I' try too make a video but since the spring is still crappy

BUT EVERYONE the voting time is soon vote for me, I promise to get a video ASAP, and If I win I will even write a HOW TO for a mill-less,lathe-less, beltsander-less, bolt action cartridge reciver design and the 3way blowgun I might write the how-to s anyways but I'll be more motivated if I do well



It's in the deux ex machina thread

k thanks pyro..now to wait for my parts....

EDIT: I shouldn't say i don't have a design at all. I have a magazine loading design, it's just a question of testing it. IT's the ejection system that I have no idea how to do
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], Yahoo [Bot]

Reputation System ©'