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 48 users online :: 5 registered, 0 hidden and 43 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

My newbmatic gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

My newbmatic gun

Unread postAuthor: phonut » Sun Sep 02, 2007 3:35 pm

Hey guys. Just found out about this section and i guess this is where i post my pics. Messy job i did with the primer, but this is my second one with a modded sprinkler valve and using the chamber as a butt. Would like some rates, advice and opinions on it. Thanks. :)
  • 0

Attachments
4ae680a4eb05.jpg
Paintball damage to a 1/2" thick plywood. Same shot at 120psi.
533009b8b48b.jpg
Shot at 120psi. 729 feets per second.

Could been better.
30dbb3b70fbc.jpg
A paintjob could cover up the mess.
a87d1f73da62.jpg
Has a 3/4" cpvc pipe connected to it. Paintballs fits nicely in it.

I also got an aluminum barrel that is just perfect for marbles. (pics not included)

phonut
Private
Private
 
Posts: 18
Joined: Sat Sep 01, 2007 12:18 pm
Reputation: 0

Unread postAuthor: frankrede » Sun Sep 02, 2007 3:59 pm

Interesting chamber!
But those primer stains are.....interesting
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: iPaintball » Sun Sep 02, 2007 4:00 pm

Nice gun! Painting it would make it look much better, but it's your gun. You could've used a nipple between the chamber and valve, but all that does is make it more compact.
  • 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

Unread postAuthor: dauphinoise potato » Sun Sep 02, 2007 4:42 pm

That's a really nice lookin' cannon you 'ave there. Have you fired anything else apart from marbles and paintballs?
  • 0

It's all a bunch of tree huggin' hippie crap!
User avatar
dauphinoise potato
Staff Sergeant
Staff Sergeant
 
Posts: 105
Joined: Sun Jul 15, 2007 8:36 am
Reputation: 0

Unread postAuthor: sergeantspud2 » Sun Sep 02, 2007 5:13 pm

Good lookin gun.
Does the marble clock in at higher or lower speed than the paintball?
Add a few more primer splashes and it could be an abstract masterpiece. :P
  • 0

:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
User avatar
sergeantspud2
Captain
Captain
 
Posts: 315
Joined: Tue Jun 07, 2005 5:43 pm
Location: So Cal
Reputation: 0

Unread postAuthor: DYI » Sun Sep 02, 2007 6:28 pm

The paintball would have higher velocity, but the marble would have greater muzzle energy.
  • 0

User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: phonut » Sun Sep 02, 2007 8:28 pm

Hey guys. Thanks for the comments.

Yeah, the paintball got the marble beat by roughly 200fps!

I also tried to fire empty co2 cans left-overred from my little bro's pellet guns. Used a 3/4" sch40 pvc pipe to fire it. I was only able to get around 220fps with that. :( It could have been that the barrel was to large for it. I'll try to fire that with a napkin-wrapped sabot or something similar in the morning.

I did the math and a 3g paintball going at 729fps (222.2 meters per sec) would give it a muzzle energy of 74 joules. I don't know the exact weight of the 0.59" glass marbles so it's pretty tough to calculate the marble's energy,
  • 0


phonut
Private
Private
 
Posts: 18
Joined: Sat Sep 01, 2007 12:18 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: TwitchTheAussie » Sun Sep 02, 2007 8:59 pm

Your pretty good man. Also who really cares about primer stains any way :lol: Its pretty sweet. I look forward to more from you :P
  • 0

Raise your horns if you love metal.
spudgunning is like sex, once you've tasted, you can't wait til next time.
-
CpTn_lAw
User avatar
TwitchTheAussie
Brigadier General
Brigadier General
 
Posts: 980
Joined: Tue Feb 06, 2007 3:23 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Sep 02, 2007 11:00 pm

Your use of primer is very modern art but interesting and original configuration and impressive performance, well done :)
  • 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: Marco321 » Mon Sep 03, 2007 2:01 am

Hey
Very nice gun i like alot. I hope to see many more guns :D
I wish my first one looked like that....
  • 0

Failure to plan is planning to fail.

The 7 P's - Proper Prior Preparation Prevents Piss Poor Performance
User avatar
Marco321
Colonel
Colonel
 
Posts: 540
Joined: Tue May 15, 2007 2:56 am
Location: Sydney, Australia
Reputation: 0

Unread postAuthor: chaos » Mon Sep 03, 2007 2:18 am

nice gun good job...

question: 730fps seems a bit optimistic to me, may i ask how far away the barrel's muzzle was from the chrony? also wat ammo was used for this shot?

not doubting it but im just curious

peace
  • 0

User avatar
chaos
Brigadier General
Brigadier General
 
Posts: 1205
Joined: Wed Jan 17, 2007 8:31 am
Reputation: 0

Unread postAuthor: phonut » Mon Sep 03, 2007 6:37 am

I appreciate the comments guys!

Modding the sprinkler valve made a tremendous difference in performance.

chaos wrote:nice gun good job...

question: 730fps seems a bit optimistic to me, may i ask how far away the barrel's muzzle was from the chrony? also wat ammo was used for this shot?

not doubting it but im just curious

peace


Hi chaos. The ammo i used to achieve 730fps was the low quality paintballs, the type that nobody would ever use in a game because it has a tougher skin, so it hurts like hell even at normal paintball speeds, and sometimes explodes in the barrel. The barrel's muzzle was about 3 to 5 yards away from the chronograph.

It's normal to doubt. I was expecting much better performance when i switched to a modded sprinkler valve. But I couldn't believe it when the chronograph displayed those numbers. Had to fired several more paintballs just to make sure the number weren't wrong and was getting readings at 716fps to as high as 740fps so far. When i was first shooting through the chronograph at 120psi, there were no backstop but there was a wooden fence about 3/8" thick and i thought it could take the hit but it has a couple of holes in it now.

I'll see if it can fire at 150 psi, but my sprinkler valve is rated to 125psi though. :(
  • 0


phonut
Private
Private
 
Posts: 18
Joined: Sat Sep 01, 2007 12:18 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Sep 03, 2007 6:53 am

I'll see if it can fire at 150 psi, but my sprinkler valve is rated to 125psi though.


I doubt it will explode, 25psi extra isn't much. For a lightweight projectile like your paintballs and the setup you're using, I find those velocity figures believable.
  • 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: spud yeti » Mon Sep 03, 2007 11:00 am

Nice looking cannon. The primer reminds me ofJackson Pollock's art. :D
Otherwise, it looks really good, with some great results too.
  • 0

really good quote/phrase here
User avatar
spud yeti
Brigadier General
Brigadier General
 
Posts: 1030
Joined: Tue May 08, 2007 1:41 pm
Location: Cape town south africa
Reputation: 0

Unread postAuthor: phonut » Mon Sep 03, 2007 1:30 pm

Rofl spud yeti. I guess i'll take that as a complement.
I'll try to keep the mess low on my next gun.


So far, i charged the gun to 150psi. One thing i did notice was how the tire valve was trying to pop out. I guess it was a good thing i used the thicker 1.25" valves instead of the regular 0.45" valves. Anyways, a few shot and i got around 800fps at that pressure. I think that will be my psi limit on this gun for now.
  • 0


phonut
Private
Private
 
Posts: 18
Joined: Sat Sep 01, 2007 12:18 pm
Reputation: 0

Next

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'