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 62 users online :: 3 registered, 0 hidden and 59 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

The Team
Administrators
Global Moderators
global_moderators.png CS

copper ball bearing gun

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

copper ball bearing gun

Unread postAuthor: JDP12 » Mon Apr 23, 2007 4:25 pm

Hello, I'm designing a copper gun designed to shoot ball bearings..But I got a couple of questions...

1) Does chamber volume really matter? I mean, PSI is PSI..right? Does large chamber volume only matter if you want to shoot large projectiles or multiple projectiles? i want to make it as small as possible..Obviously just for looks..sort of like chaos's S400 Sniper.. But what is your opinion? I was thinking a chamber volume of around 50 cubic inches..Would that be enough to propel a .5" ball bearing around 450 fps..but a higher one would alwasy be better. I know at least one of you will suggest the GGDT...well I would use it...but my parents won't let me download it quite yet... So would a 50 cubic inch chamber be enough to propel a ball bearing at least 450 fps?

2) What kind of valve should I use?? I saw chaos's custom one..and I really like the look of that one....Anyone know how to build a valve like that?? Is it basically just a piston valve??

So thanks for the information guys....I know number one may seem like a stupid question....But I was just wondering about that..
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: Hotwired » Mon Apr 23, 2007 4:33 pm

You could make a piston valve or buy a Quick Exhaust Valve (QEV).

Chamber volume is importantish. If you can get high pressure you don't need such a large chamber.

What kind of pipe were you thinking of for the chamber and for the barrel?

Also, what kind of pressure can you get?
  • 0

Last edited by Hotwired on Mon Apr 23, 2007 4:34 pm, edited 1 time in total.
User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: ShowNoMercy » Mon Apr 23, 2007 4:33 pm

Well if your sacrificing volume, that means you need to increase the PSI and hope for the best with whatever valve you build.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: homeflake210 » Mon Apr 23, 2007 4:37 pm

that is an awsome gun!
  • 0

Kenny_McCormic wrote:when asking the keywords to use are "firearm" and "airgun"
ifyou call and say, yo waazup cani bring my extra big ass cannon my trip in the plane? you will get a definent NO!
User avatar
homeflake210
Specialist
Specialist
 
Posts: 50
Joined: Mon Sep 25, 2006 6:33 pm
Reputation: 0

Unread postAuthor: JDP12 » Mon Apr 23, 2007 4:41 pm

K well my air compresor can only hold 125 psi..so i may need to use a large chamber..And as for the barrel and chamber material....I don't know yet..whatever my fleet farm has
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Apr 23, 2007 4:46 pm

For smaller launchers, I think chamber volume is less important than PSI (although it should be considered, read on)

Have a look at what I had done with my HVBB launcher back on spudtech.

Here's the pictures as the don't show in the archived thread:
  • 0

Attachments
hvbb.JPG
HVBB original configuration
hvbb.JPG (32.48 KiB) Viewed 1352 times
hvbbplus.JPG
HVBB extended chamber
hvbbplus.JPG (17.57 KiB) Viewed 1352 times
hvbb chamber.jpg
HVBB chamber closeup
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: hi » Mon Apr 23, 2007 4:59 pm

ball barrings dont weigh enough to really matter. if you had a 1'' chamber that was 1 1/2'' long and a 1/2'' barrel that was 3 or 4 feet, you would have plently of power One thing that you may want to consider is that even if the chamber is rediculously big, it will still increase the muzzle volosity a little. so yes it important and at the same time it really isnt. on combustions it is really important to get it right, on pneumatics it really doesnt matter. you can have th C:B be 1:4 and it would be just fine, but a combustion like that would suck really bad.
  • 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

Sponsored

Sponsor
 


Unread postAuthor: JDP12 » Mon Apr 23, 2007 5:03 pm

K thanks jackssmirking revenge and hi..Guys.. I have a really basic and seemingly stupid question here... In this piston design...which has been the most helpful to me..I can't figure out why the equalization hole would be through the center of the piston!

http://www.advancedspuds.com/valve2.htm

Okay sorry for the stupid question.....I've used search, both on this site and on the internet...Okay here goes..

1) So that fitting that is in the lower left- the one that looks like a reducer coupling.that is connected to the chamber...And then the upper part of the T goes to the barrel correct?

2) One more thing- I just plain forgot something..kind of embarrasing...In order for the piston to seal.....the equalization hole would have to be sealed for a little correct?? How would I do that?? Or would it provide sufficient pressure...Just by making the equalization hole small enough?? Or should I make some sort of valve??

K so sorry for all of these stupid questions...I just need this one little more bit of information to really get this concept into my head..
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Apr 23, 2007 5:14 pm

If your piston fits tight enough in the chamber (assuming a barrel sealer where the piston face seals against the breech end of the barrel, not a chamber sealer) you won't need o-rings or an equalisation hole.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: hi » Mon Apr 23, 2007 5:30 pm

i agree with jack, i dont have o rings or equlization holes on mine and they work. also, the equilization hole doesnt have to be in the center, it can be a narrow groove on the side.

it would be impossible to be right in the center because thats where the the bolt for the sealing face goes.
  • 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: iPaintball » Mon Jul 23, 2007 1:22 pm

The reason it runs through th centr is because it's a chamber sealer. Look at the animation at the boottom of the page.
  • 0

Summer Projects:
CO2 tank hybrid: Gotta fix the meter :(
Cane gun: Needs a pilot/fill setup
1.5" piston valve gun: Almost done
User avatar
iPaintball
Colonel
Colonel
 
Posts: 695
Joined: Sun Mar 04, 2007 8:37 pm
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'