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 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

T.D.U -Thunder Down Under

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

Unread postAuthor: watto » Fri May 09, 2008 5:05 am

the problem I think may be getting it to travel straight though the middle of all of them but we will see...hopefully within the week
  • 0

User avatar
watto
Captain
Captain
 
Posts: 327
Joined: Wed Dec 13, 2006 5:47 pm
Location: Australia
Reputation: 0

Unread postAuthor: MrCrowley » Fri May 09, 2008 5:16 am

I'd say 4 or 5, but I think it will deflect after the first 2.

Oh and very nice cannon btw, I see you have the balls to even fire it at 70psi in your garden :D
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: watto » Fri May 09, 2008 5:36 am

yep I agree, I'll strap them together or put em in a box or something, maybe that will help keep it on track

Yeah I'll fire it at 100PSI in my garden when I do this next vid, It has to be from close up tho cos if I miss the small concrete slab It'll break a lot of glass on the other side of the fence :shock: :D
  • 0

User avatar
watto
Captain
Captain
 
Posts: 327
Joined: Wed Dec 13, 2006 5:47 pm
Location: Australia
Reputation: 0

Unread postAuthor: M.J.P. » Fri May 09, 2008 6:32 am

yeah how close? Are you talking like 10 metres or 5 metres or 1/2 a metre?
  • 0

Last edited by M.J.P. on Sat May 10, 2008 12:45 am, edited 1 time in total.
Never take life seriously. Nobody gets out alive anyway.
User avatar
M.J.P.
Specialist
Specialist
 
Posts: 48
Joined: Thu May 08, 2008 2:36 am
Reputation: 0

Unread postAuthor: JDP12 » Fri May 09, 2008 7:13 am

wow that is a nicely built gun, good job watto
  • 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: watto » Fri May 09, 2008 7:19 am

About 5 metres, I'll have to find somewhere safer to shoot... When I get my own camera, I'll take it into the bush and shoot some stuff from far away. I also have to bite the bullet and chop 20cm off the barrel so it can fit in my car, then I can range test it at this big park near my house.
  • 0

User avatar
watto
Captain
Captain
 
Posts: 327
Joined: Wed Dec 13, 2006 5:47 pm
Location: Australia
Reputation: 0

Unread postAuthor: JDP12 » Fri May 09, 2008 7:22 am

still, that gun is sick, hope testing goes well!
  • 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: M.J.P. » Fri May 09, 2008 7:23 am

watto wrote: I also have to bite the bullet and chop 20cm off the barrel so it can fit in my car.


It's sounds like a sacrifice you will have to make for the good of SpudFiles.
  • 0

Never take life seriously. Nobody gets out alive anyway.
User avatar
M.J.P.
Specialist
Specialist
 
Posts: 48
Joined: Thu May 08, 2008 2:36 am
Reputation: 0

Unread postAuthor: JDP12 » Fri May 09, 2008 7:38 am

oh well, just go buy another barrel later.... good luck with the testing. IF i might recommend maybe putting a couple on the end of the barrel so you can add the extension when you get to the park?

I don't know how it would effect accuracy though


700th post!!!! :wav:
  • 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: watto » Fri May 09, 2008 7:51 am

I would expect a coupling would not hold the extension by just friction, but I might try. I think the best way would be a camlock or some 50mm threaded adaptors with ported out bushings so the 2 barrels meet perfectly, both of these wouldnt really be cheap, but I may do it in the future if its range isnt up to scratch.

According to GGDT barrel length isnt as crutial as I thought so I'm not that worried, theres no point of having a gun that can shoot probly over 300m if you cant take it anywhere cos its too big for the boot, so its a sacrifice that must be made. :x
  • 0

User avatar
watto
Captain
Captain
 
Posts: 327
Joined: Wed Dec 13, 2006 5:47 pm
Location: Australia
Reputation: 0

Unread postAuthor: JDP12 » Fri May 09, 2008 1:10 pm

yea thats true, the friction probably wouldn't do it.

oh well, good luck with the testing
  • 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: locksmith » Fri May 09, 2008 2:58 pm

Thats one way to water that plant I guess.Nice cannon
  • 0


locksmith
Staff Sergeant
Staff Sergeant
 
Posts: 119
Joined: Tue Mar 20, 2007 4:55 pm
Reputation: 0

Unread postAuthor: MrCrowley » Fri May 09, 2008 3:54 pm

watto wrote:According to GGDT barrel length isnt as crutial as I thought so I'm not that worried, theres no point of having a gun that can shoot probly over 300m if you cant take it anywhere cos its too big for the boot, so its a sacrifice that must be made. :x

My SGA shoots close to 400 with a 90cm barrel and a smaller valve, you should have no trouble shooting around 400m.

I say around 400m because i'm not sure how far is too far for a golfball shot by compressed air, there probably is some limit at low pressures (80-150psi).
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: watto » Fri May 09, 2008 8:41 pm

MrCrowley wrote:My SGA shoots close to 400 with a 90cm barrel and a smaller valve, you should have no trouble shooting around 400m.

I say around 400m because i'm not sure how far is too far for a golfball shot by compressed air, there probably is some limit at low pressures (80-150psi).


Awesome! looks like I might need to find a bigger park :P What size is your valve I thought it was a 50mm tee so you could sleeve a gb barrel in it? Or do you mean my pilot valve?

The most I take any gun to is 130PSI which I haven't done with this one yet because the sprinkler is leaking out its exhaust side above 80PSI and I cant work out why, so I may have to get a new sprinkler.

Also do you reckon my bumper is adequate? It's a bit of bike pump hose curled in a circle and held down by an extra bit of neoprene, which hits the inside of the plug which is filled with hot glue.
  • 0

User avatar
watto
Captain
Captain
 
Posts: 327
Joined: Wed Dec 13, 2006 5:47 pm
Location: Australia
Reputation: 0

Unread postAuthor: MrCrowley » Fri May 09, 2008 8:54 pm

Sorry I overlooked the fact that only your chamber is 80mm, not the tee :oops:

Just try the usual checks for dust, PVC particles etc on the diaphragm, make sure the spring is seated correctly and the diaphragm isn't unevenly seated, things like those.

If you can take it back, may as well.

Well you'll soon find out if it is or not :D

It should be, the way your severiceable piston works should be pretty solid as it is.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

PreviousNext

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'