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 64 users online :: 5 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 [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

High pressure co-axial build log- updated 11/14/08

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

Unread postAuthor: pizlo » Thu Mar 27, 2008 9:36 am

Gippeto wrote:Sick is good? 8) It will look similar to a bullpup assault rifle when done.

Not only could I take it to 6000psi, I did...for proving (see the pic with the gage). Designed operating pressure is 3000psi. All parts exposed to pressure have a minimum rating of 9000psi. (calculated using yield strength of the material)

"Where do you work?? "

Only the shadow knows! :lol:

yes, sick is quite good. And in the last sentence are you referencing the 1920s radio show about "the shadow"?
  • 0

User avatar
pizlo
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Dec 22, 2006 7:27 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Mar 27, 2008 10:17 am

Gippeto wrote:Accuracy will be the issue not power. A mold for foster slugs will have to be made.


Hence the "50 yard" specification :)

Shame you couldn't have made it closer to 0.72" calibre, that would have made all ammunition made for smoothbore shotguns avaialbe as a ready-made option for ammo - though I suppose a few layers of duct tape wrapped around the said projectiles would still make them good enough for you.
  • 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: Gippeto » Thu Mar 27, 2008 1:33 pm

Pizlo, Yes. It seemed funny at the time.

JSR, I know Lyman makes a 12ga slug mold for sabot slugs, I'll check to see if they make a foster slug mold. (I cannot see why they would not)

I did some quick searching and turned up that 10 gauge shotguns have a nominal bore size of .770". 10ga foster slug mold? I'll have to look.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: RDX, » Thu Mar 27, 2008 2:27 pm

how are you going to trigger the hammer ?
if you have any plans for trigger system, I would like to get some plans from you for my hammer valve rifle :wink:
  • 0

User avatar
RDX,
Corporal
Corporal
 
Posts: 77
Joined: Sat Mar 31, 2007 2:16 pm
Location: Finland
Reputation: 0

Unread postAuthor: Gippeto » Fri Mar 28, 2008 1:06 am

The hammer will be triggered with a fairly conventional sear arrangement. There will be a linkage running past the pilot vent and check valve to the trigger. I have not yet decided whether the linkage will be double or single sided, but I am leaning toward double sided. (like a ladder)

I don't have printed plans, but it's just a trigger and sear, there are many ways to set it up.

It really depends on where your trigger and sear are in relation to each other, and the types of adjustment you wish to incorporate.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: jackssmirkingrevenge » Fri Mar 28, 2008 1:20 am

Gippeto wrote:I did some quick searching and turned up that 10 gauge shotguns have a nominal bore size of .770". 10ga foster slug mold? I'll have to look.


They certainly exist, that's over 750 grains worth of lead, and more weight equals lower velocity but better efficiency so the foot pounds would go up.

Beware the recoil though ;)
  • 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: Gippeto » Fri Mar 28, 2008 2:05 am

Several brands load a 10 gauge slug, but can I find a simple mould?

Not yet. (although Corbin does offer some ideas) :)

http://www.corbins.com/slugs.htm
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Sponsored

Sponsor
 


Unread postAuthor: FordGtMan » Wed Apr 16, 2008 10:23 pm

If this is kicking a topic, sorry, but have you made any progress on the check valve that your redoing? This is going to be my favorite cannon ever when finished :) . Just love that coax look :D
  • 0

User avatar
FordGtMan
Captain
Captain
 
Posts: 314
Joined: Thu Oct 25, 2007 9:15 pm
Location: southlake Tx
Reputation: 0

Unread postAuthor: Gippeto » Thu Apr 17, 2008 12:20 am

You bet. The check valve and probe style fill are done. (pic is at the top of the thread)

I have finished mocking up the sear, and have the carbon steel piece layed out and ready to cut. Should have the sear ready for heat treat by the weekend.

By mock up, I mean I welded small pieces together to develope the shape, then I transferred this shape to a piece of carbon steel. This will give me a part which is all one piece.

The mount for the sear is at the approximate same stage.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: Gippeto » Sat Apr 26, 2008 4:03 pm

I'm going to bump my own thread, sorry if I offend anyone.

I finished the sear to a point where it is workable this morning. :)

Being curious, I assembled the co-ax "fully" for the first time, with a schrader in place of the check valve (easier right now) for a function check.

Charged to 120psi, it "spoke" to me for the first time. :D

Works beautifully! This is going to be a beast! :twisted:

Will try and get a vid today.

Edit: Vid is up on first post.
  • 0

Last edited by Gippeto on Sat Apr 26, 2008 4:43 pm, edited 1 time in total.
"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: SpudFarm » Sat Apr 26, 2008 4:05 pm

;) i hope you get a high pressure vid also:P
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: Velocity » Sat Apr 26, 2008 4:12 pm

I tried searching a bit, but I couldn't find anything that would help me out. Could you explain exactly how a hammer valve functions? Thanks.

Nice cannon by the way!
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: Gippeto » Sat Apr 26, 2008 7:03 pm

Thanks. :)

If you're interested in hammer valves, Ant has some simple but very effective designs in the bbmg/strafer showcase area.

http://www.spudfiles.com/forums/bbmg-st ... e-f10.html

These would be a good place to start. He has animations/drawings of them, which will make it easier to understand.

If after studying Ant's stuff, you still have questions, I'll be happy to help however I can. :)
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: Mitchza89 » Sun Apr 27, 2008 8:46 am

God god mate. You're turning out to be one of the more skilled spudders on this site. I love everything you've put out so far. Keep them coming and I'll be sure to keep my eyes peeled on this post :D.
  • 0

Image
User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

Unread postAuthor: trae08 » Sun Apr 27, 2008 9:49 am

just curious how do you get to 6000 psi?

and that is one of the most amazing coaxials i have seen.
  • 0

Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

PCGUY wrote:Congrats, your the first donating member I have had to ban.
User avatar
trae08
Donating Member
Donating Member
 
Posts: 520
Joined: Sun Jul 09, 2006 2:14 pm
Location: florida
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Discussion

Who is online

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

cron
Reputation System ©'