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 55 users online :: 5 registered, 0 hidden and 50 guests


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

Registered users: Bing [Bot], Google [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

New Piston Cannon....Near Explosive Decompression

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: jmadden91 » Sat Jun 06, 2009 11:21 pm

Mate this thing is beautiful. Its in the wrong spot though, a mod needs to shift this over to the showcase

Beautifully done velocity
  • 0

User avatar
jmadden91
2nd Lieutenant
2nd Lieutenant
 
Posts: 246
Joined: Thu May 07, 2009 6:03 pm
Location: Queensland, Australia
Reputation: 0

Unread postAuthor: Carlman » Sat Jun 06, 2009 11:48 pm

Come onmate get some pics actually in the thread, i came to this thread a while back and couldnt be bothered looking at it because of the lack of visual aids...

But anyway very nice work mate!
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: Gaderelguitarist » Sun Jun 07, 2009 1:15 am

Absolutely stunning work!
The multitude of hex bolts does indeed give it a military look.

Oh the things I would do for access to a machine shop... :(
  • 0

User avatar
Gaderelguitarist
Colonel
Colonel
 
Posts: 580
Joined: Sat Aug 16, 2008 9:56 pm
Location: Columbia, MD
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Jun 07, 2009 7:59 am

Beautifully made, though some illustration of its performance would be appreciated :)

Also, why operating at such a relatively low pressure?

edit: hadn't seen the damage pics, use the image tags ;)

Image
  • 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: jimmy101 » Sun Jun 07, 2009 2:30 pm

Damn that is a sweet build. For a first gun it's off-scale. Overall I would put it easily in the top 1% of the thousands of "spudguns" I've seen posted.

Really should rename it though, "Hungus" it ain't. It's beautifully executed, looks well balanced and a heck of a lot more portable and manageable than 99% of guns of similar size, most of which probably don't perform nearly as well.

Personally, I would go with something like "ElaGun" (as in elegant). :D

Make a thread in the pneumatic finished gun forum with pictures. This gun definitely needs to be on the web in a few different places so that it's description and photos will survive "web rot".

EDIT:

MOVIES PLEASE!!!

Chrono data would be sweet. A shooting chrony is about $70, or you can build your own for a couple bucks if you have a laptop or old PC that you can get to the shooting site. There are several people on this forum that can help with a homebrew chrono if you need it.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3127
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: Moonbogg » Sun Jun 07, 2009 7:09 pm

USGF wrote:A couple boxes of SHCSs and a counterbore. Good stuff.

USGF


I can't tell if you were being sarcastic or not. Is it good or bad? Or, for a quick esape, it could be neither.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: velocity3x » Sun Jun 07, 2009 8:49 pm

Jack,
I'm still operating it a "Relative low pressure" because the gun was just completed just over a week ago. I haven't had much time with it to find it's upper limits. The pressure gauge on the gun tops at 160psi max and until I get into town to buy another.....I won't exceed it's max. I did some testing this morning at 160psi in prep for a video maybe next weekend. As for the performance I have nothing yet except my observations. At 160 psi, the ball can't be seen in flight. At a distance of 100', the ball "drills" a hole completely through the 16" thick hay bale backstop and some balls land 100 yards beyond. At 160psi and the wheel brakes locked, the recoil is extremely brutal on the 100+ lb gun. It's definitely not a shoot from the shoulder or hip kind of gun. In future days I plan to increase testing pressure to a max of 400psi.

Jimmy,
Thanks for the good words. A crono is on my shopping list for next week.
  • 0

User avatar
velocity3x
Brigadier General
Brigadier General
 
Posts: 827
Joined: Fri Jun 05, 2009 3:09 pm
Location: Yuma, Arizona
Country: United States (us)
Reputation: 7

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Sun Jun 07, 2009 11:15 pm

velocity3x wrote:In future days I plan to increase testing pressure to a max of 400psi


Looking forward to that :)

Performance is probably already overkill but given the disparity between chamber and barrel volume, you could easily add a foot of barrel length for even higher velocity. It would also help with noise abatement.

One small curiosity, do you find that venting the pilot downwards spoils your aim, or does it counter muzzle rise in the way a compensator does?

It would also be interesting to see some alternative ammunition in action, a sabot and fistfull of BBs would make one heck of a shotgun :D
  • 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: USGF » Mon Jun 08, 2009 3:27 am

Moonbogg wrote:
USGF wrote:A couple boxes of SHCSs and a counterbore. Good stuff.

USGF


I can't tell if you were being sarcastic or not. Is it good or bad? Or, for a quick esape, it could be neither.


Moon, we are planning on building some intense stuff too. Note that this build would be very expensive even with a machine shop. Left over billet is not bad but if you gotta buy it...... Hats off to this builder. VERY nice.

Oh BTW, I know you know but SHCS are socket head cap screws for those who don't.

http://www.palmerbolt.com/catalog.asp?p ... prevnext=1

Counterbores are the tools used to cut the sunken seats for those screws. :shock:

USGF
  • 0

User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: starman » Mon Jun 08, 2009 9:49 am

Wow! Not much to say that hasn't already been stated. I love the barrel support rails and overall machined look and execution. The WWII theme works very well and the dolly mount is a sweet touch.

Beautiful work velocity! You have placed yourself squarely in the upper echelons of cannon building.
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: Moonbogg » Mon Jun 08, 2009 10:03 am

USGF wrote:
Moonbogg wrote:
USGF wrote:A couple boxes of SHCSs and a counterbore. Good stuff.

USGF


I can't tell if you were being sarcastic or not. Is it good or bad? Or, for a quick esape, it could be neither.


Moon, we are planning on building some intense stuff too. Note that this build would be very expensive even with a machine shop. Left over billet is not bad but if you gotta buy it...... Hats off to this builder. VERY nice.

USGF


I always thought c'bores were pretty cheap if you're already drilling a hole anyways. Same setup and usually with one tool from what i've seen. Its clear this builder wasn't going the economical route anyways. This is something that will last him forever and be worth every penny.

Yes, this poster's cannon is incredibly beautiful. Hats off for sure. One thing I find very sweet looking is the scuba tank mounted underneath. It looks like a high end pneumatic air rifle (oh wait, it is!). Very cool.
velocity3x, if you wanted you could also look into 1 1/2" SCH10 6061-T6 pipe. It could easily mount via bushings. Either way, I love the style of this design and I bet its crazy powerful. It looks like it would be so much fun to aim around your yard on that pivoting mount you have (very nice BTW) and just shoot all day at random fun stuff. Awesome build and I hope you make others.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: velocity3x » Mon Jun 08, 2009 11:17 am

jackssmirkingrevenge wrote:One small curiosity, do you find that venting the pilot downwards spoils your aim, or does it counter muzzle rise in the way a compensator does?


Jack,
I aimed the pilot valve down to protect my eyes while firing. The valve is 3/4" and the pilot chamber contains only 6 cubic inches of pilot air. The discharge from the pilot valve is extremely insignificant. The gun is balanced in the vertical pivot about 1 pound heavier at the muzzle end to counter any flip. As a result, the gun stays flat and on target while firing. All the recoil is directed straight back along the longitudanial axis of the barrel resulting in zero muzzle flip. However, the recoil is still quite strong. With the wheel brakes set, at 160psi the recoil slides the 110+lbs cannon and dolly backward a couple inches on the concrete floor.
  • 0

User avatar
velocity3x
Brigadier General
Brigadier General
 
Posts: 827
Joined: Fri Jun 05, 2009 3:09 pm
Location: Yuma, Arizona
Country: United States (us)
Reputation: 7

Unread postAuthor: dewey-1 » Mon Jun 08, 2009 11:55 am

Velocity3x;

Thanks for posting pictures rather than the links!

Everyone here will enjoy your beautiful workmanship more!

Much easier to to do than looking up on a separate service.

Looking forward to more projects from you!
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: velocity3x » Mon Jun 08, 2009 12:07 pm

starman wrote:The WWII theme works very well and the dolly mount is a sweet touch.


Thanks.
It would be impossible to fire without a mount. I also built another mount so I could load the gun (with minimal effort) onto my pickup truck and haul the cannon and CO2 tanks out to the desert for some long range tests.

<img src="http://i145.photobucket.com/albums/r240/velocity3x/44mm%20HUNGUS/DSC00465.jpg?t=1244479624">

The vertical pivot mount is attached to an aluminum flange containing 2 front wheel bearings back to back (1994 chevy 2500hd Hey...on a farm you use what ya got). The aluminum flange bolts to a mating flange on the dolly and separates from the dolly flange with 4 bolts. The truck mount has the same mating flange as the dolly. It's "L" shape and plugs into the receiver hitch of the truck. The cannon can be moved from the dolly to the truck in just a few minutes.
  • 0

User avatar
velocity3x
Brigadier General
Brigadier General
 
Posts: 827
Joined: Fri Jun 05, 2009 3:09 pm
Location: Yuma, Arizona
Country: United States (us)
Reputation: 7

Unread postAuthor: Daltonultra » Thu Jun 11, 2009 12:19 am

Incredible...I'm speechless.
Almost as speechless that such an incredible cannon should lack the perfect trigger...
I use a 1/2 QEV as a firing valve for my blow-dart gun, and I think it would be the perfect pilot for your monster:

http://www.fastenal.com/web/products/de ... 206&ucst=t

You also need a trigger valve to pilot that(recursion, sweet recursion!)
And this little sucker provides that service for me:

http://www.mcmaster.com/#6790t42/=29jtri

(look for yellow highlighted entry)
  • 0

The Official High-Tech Redneck

"There is no such thing as overkill." ~Solomon Short
User avatar
Daltonultra
1st Lieutenant
1st Lieutenant
 
Posts: 282
Joined: Mon Nov 24, 2008 8:17 pm
Location: Columbus, Ohio, U.S.A.
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'