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 71 users online :: 5 registered, 0 hidden and 66 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Copper Marble Cannon

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

Copper Marble Cannon

Unread postAuthor: PCGUY » Mon Jan 31, 2005 7:36 pm

<div align="center">COPPER MARBLE CANNON

Provided By - GalFisk </div>
  • 0

Attachments
pbfront.jpg
pbfront.jpg (5.33 KiB) Viewed 7995 times
pbexit.jpg
Finally, I decided to shoot along the edge of the board to see what would happen. It went about 5cm (2&quot;) through the board before going out at one side.
pbexit.jpg (2.33 KiB) Viewed 7995 times
compexit.jpg
I also brought some old particle board from a speaker somebody had dumped in the woods. It was about 2 cm (.78&quot;) thick, but not in it's best shape. Again notice the bigger exit hole.
compexit.jpg (11.5 KiB) Viewed 7995 times
bottlentry.jpg
I also shot at the empty casing from a broken 12V compressor, again the exit hole was much bigger.
bottlentry.jpg (17.22 KiB) Viewed 7995 times
sandalvandal.jpg
The leather isn't particularly thick or strong, I do have some old leather shoes, but they're still far too nice to be used as targets. They're my spudding shoes, which I use when I don't want to mess up my nice pair.

I also shot the top of the failed fan-in-a-bottle, the plastic kind of peeled off, and closed the hole after the marble had passed through. The exit hole (right) was much bigger that the entry.
sandalvandal.jpg (14.47 KiB) Viewed 7995 times
sun.jpg
The chamber size seems to be quite sufficient on this gun, according to GGDT I'll gain 4 fps by increasing chamber size eight times. Barrel length matters a little more, with twice the barrel (an unwieldy length of 4m) I'll gain about 60 fps at 100 psi. Projectile weight and pressure seems to be the most important factors though, and with a metal gun I can go a bit higher than with PVC.
I went out and did a few more tests, because I wondered if I could shoot through the leather on the top of sandal. That was no problem.
sun.jpg (9.64 KiB) Viewed 7995 times
marblesand.jpg
And the hole through the first can of lids was completed.
lids.jpg
I then reassembled the stack of lids, and shot four marbles simultaneously into the cans. Two of the marbles were completely pulverized.
lids.jpg (15 KiB) Viewed 7995 times
lidhole.jpg
The marble went through six lids and was stuck halfway through the seventh. The eighth lid, the last one in the first can, had a hole in it, and the bottom of the can was dented.
plateshot.jpg
With my newfound increase in pressure, I had to do another penetration test. I didn't have enough tin cans, but I had a lot of jar lids that were about as thick. I filled two tin cans with lids and fired a shot, which made a nice hole.
plate.jpg
This result was more satisfactory.
plate.jpg (12.72 KiB) Viewed 7995 times
bardent.jpg
Then I set up an old dinner plate, that had decided to break for no apparent reason. The glue job wasn't satisfactory, so I decided to do the best out of the situation
bardent.jpg (5.98 KiB) Viewed 7995 times
shoe.jpg
The marble went straight through, and had enough energy left to put a nice dent in one of the bars on the shopping cart
marbledamage.jpg
It was given an honorary escort of two other marbles to some place out on the ice. The cans went in the metal bin at the recycling station.

Shot some more today, since it was very nice weather unlike last weekend. I improved the seal on the bike pump, so I could get the gun up to about 110 psi this time. I'm probably going to buy a big-ass CO2 tank and regulator, unless it's too expensive or cumbersome.

First, I decided to take it out on an old sandal
marbledamage.jpg (1.76 KiB) Viewed 7995 times
holestop.jpg
The marble was chipped on both sides.
holestop.jpg (12.29 KiB) Viewed 7995 times
holes.jpg
Top view
canstack.jpg
Then I loaded a marble, pumped the gun as high as I could, donned safety glasses then lined up the barrel and fired.

The marble went through the bottom of six cans before stopping with a big dent in the seventh. The seventh can was pounded into the eighth, they couldn't be separated by hand afterwards. The order in the picture isn't the order the cans were stacked in.
canstack.jpg (16.48 KiB) Viewed 7995 times
birchhole.jpg
The picture is accurate, this tree is actually horizontal at the point where I hit it. The damage will grow shut over the summer. If you shoot soft projectiles the shreds will explode outwards when the projectile hits the wood, and can tear large holes in the bark.

Finally, what I was planning to do was to see how many tin cans I could shoot a marble through. I took the eight ones I had brought and stacked them together, and braced them against the shopping cart.
birchhole.jpg (19.45 KiB) Viewed 7995 times
marblelog.jpg
But it only took the bark off of a fresh tree.
marblelog.jpg (17.97 KiB) Viewed 7995 times
seamhole.jpg
I also shot at the end of an old log, the marble was firmly embedded in the wood.
seamhole.jpg (9.06 KiB) Viewed 7995 times
metal.jpg
I hung a tin can on the barrel and fired through it, it was torn apart at the seam.
metal.jpg (9.66 KiB) Viewed 7995 times
metaldent.jpg
This is about 3mm thick chromated steel.
orangeshot.jpg
If the snow seems a little bleak in this and other pictures, it's because I've adjusted the gamma. The snow throws off the compensation in the camera, and some pictures became overly dark.
Denting metal is fun (or something). It doesn't show very well in the picture, but there's powdered glass stuck in the dent.
orangeshot.jpg (4.08 KiB) Viewed 7995 times
orange.jpg
And shot it.

Nothing overly dramatic, just a 'thwap' sound and a hole. If the orange is still there tomorrow I might shoot it with the combustion gun.
orange.jpg (7.11 KiB) Viewed 7995 times
brokenmarble.jpg
I'm very happy with my first pneumatic.

It's not done (crappy varnish peels off so I need something better, CO2 setup, better barrel support, pressure meter, etc), but it's working, and working very well. I've had some minor sealing problems using the bike pump as air source, but the valve is easy to take apart and fix in the field.

Someone had thrown away a perfectly good orange by the road, so I took it.
brokenmarble.jpg (11.22 KiB) Viewed 7995 times
dent.jpg
I actually found one of the marbles, its shape suggests that it was the one I used to make the dent. A bit in the center of the round part was crushed from the initial contact, when the marble was stopped by the metal, the parts that wasn't braced against the inside of the dent came off and was probably pulverized against the metal in front.
dent.jpg (16.19 KiB) Viewed 7995 times
cd2nd.jpg
I also put a nice dent in the frame of the shopping cart with one marble.
cd1st.jpg
A second shot through the middle split some of them in to, and broke a large hole in the middle of others.
cd1st.jpg (13.98 KiB) Viewed 7995 times
cdstack.jpg
The first shot hit near the edge, and tore successively bigger holes in the CDs. The hole in the first CD was about the size of a marble, the last one was about five times as large.
bar.jpg
I had brought some junk CDs I decided to shoot
wheel.jpg
I did some range shots with a relatively flat trajectory, I think I can shoot across the lake at good elevation (400m) but there's popular a hiking trail all the way around it so I won't try. The lake is about a mile long so I can do range tests that way when there's no people on the ice, but I don't have any way to see where the marble lands. A smoke marker or something would be nice...
Another shot at the bars of the cart bent one of them out of shape.
wheel.jpg (6.46 KiB) Viewed 7995 times
valve.jpg
This is the assembled valve. the hose barb connected to the blowgun in the picture is a perfect fit for the air chuck on a 12V compressor. I also have a quick-disconnect fitting for connecting the gun to an ordinary compressor.

The parts of the valve have been changed a bit since the pictures were taken, and I've definitely forgotten the cable to my camera in Norway, but I'll get some updated pictures of it as soon as possible. The concept drawing of the valve also needs to be updated accordingly.
UPDATES!

There is a shopping cart stuck in the ice at the lake, which I used for target and support. first shot was through the wheel, which was no match at all.
valve.jpg (16.55 KiB) Viewed 7995 times
polish.jpg
Polished copper looks very nice.
polish.jpg (6.65 KiB) Viewed 7995 times
solderjob.jpg
The bulk of the soldering was on the tee, where the chamber, barrel and connector all come together. It was a bit complicated to get everything lined up, since I had to heat and solder all the parts in sequence, to prevent the heating one joint from breaking another. The barrel came on slightly askew, but with some grinding on the end, it seals perfectly. The soldering on the brass connector wasn't airtight in the first try, probably because I hadn't heated the large brass fitting enough, but it was successful on a second try. A piece of 28mm pipe is used to connect the brass fitting to the tee, the piston slides inside this piece of pipe. You can see I've begun to polish the chamber.
marblegun.jpg
This is a gun I've always wanted to build, a pneumatic marble gun out of copper. It has a 2m long barrel of 18mm copper pipe, a perfect fit for 16mm (5/8&amp;quot;) marbles. The chamber is made out of 1m 28mm copper pipe, with couplers the total chamber volume is about 580cc. All copper parts are sweated (soldered) together, with a 35mm brass coupling on the back end, to which the blowgun is connected. The back of the coupling can be screwed off to allow access to the valve. This picture was taken after the gun was polished and coated with several layers of metal varnish. I'm going to add barrel support, some sort of shoulder strap, possibly a tripod, and a CO2 setup. The gun hasn't been tested with marbles yet, but it has been dry-fired at up to 180 psi, at which it gives a loud crack. The air from a dry firing blasts great holes in newspaper.
marblegun.jpg (7.83 KiB) Viewed 7995 times
Last edited by PCGUY on Mon May 08, 2006 10:21 pm, edited 1 time in total.
Yes, I am the guy that owns & operates SpudFiles (along with our extremely helpful moderators).
User avatar
PCGUY
Site Admin
Site Admin
 
Posts: 1576
Joined: Wed Aug 18, 2004 10:54 pm
Location: Illinois
Country: United States (us)
Reputation: 19

Unread postAuthor: theexp » Wed Feb 02, 2005 8:25 pm

"hey johnny, you want ta play Marble...."
that things kinda scares me. lol, Real nice job on ANOTHER COPPER CANNON...
  • 0

<img src="http://www.spudfiles.com/uploader/uploadFiles/post-12-1064980630.gif">

My website www.freewebs.com/potato_cannon/
User avatar
theexp
Master Sergeant
Master Sergeant
 
Posts: 157
Joined: Sun Oct 03, 2004 3:19 pm
Location: Chapel Hill NC
Reputation: 0

Unread postAuthor: Hunter » Wed Feb 16, 2005 3:06 pm

hey dude that thing is awsome it looks really simple id like to build one but i dont know what id use for a burst disk scary nice job truly nice
  • 0


Hunter
Private
Private
 
Posts: 2
Joined: Thu Feb 03, 2005 9:45 pm
Location: seminole ,tx
Reputation: 0

Unread postAuthor: BC Pneumatics » Wed Feb 16, 2005 6:36 pm

Alumminum foil works great. Just layer it for higher pressures.
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: spudshot » Thu Feb 17, 2005 8:58 pm

he doesnt use a burst disk though does he?
i've built a copper cannon like taht, a 1/2" barrel, but i cant find any damn marbles to fit it! also the piston destroys itself, but that'll change when i get my 1/4" brass washers drilled
  • 0

Image

spudshot
Brigadier General
Brigadier General
 
Posts: 1036
Joined: Sun Oct 03, 2004 7:16 am
Reputation: 0

Unread postAuthor: fred_roux » Sun Apr 10, 2005 3:48 pm

nice damage pics :twisted:
  • 0

User avatar
fred_roux
Specialist
Specialist
 
Posts: 46
Joined: Mon Feb 14, 2005 4:29 pm
Location: Québec (canada)
Reputation: 0

Unread postAuthor: CS » Sun Apr 10, 2005 4:00 pm

I like the gun nice sodering job.
  • 0

User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Sponsored

Sponsor
 


Unread postAuthor: GalFisk » Mon May 09, 2005 12:38 am

Thanks for the comments. It's using a normal barrel-sealing piston valve. More cannon and damage pics can be found in my gallery: http://galfisk.kaaven.net/gallery
  • 0


GalFisk
Staff Sergeant
Staff Sergeant
 
Posts: 103
Joined: Mon Feb 28, 2005 4:06 am
Reputation: 0

Unread postAuthor: hardcor22 » Wed Aug 17, 2005 2:34 am

Sweet gun bro i have a marble gun not copper though but crap that kicks my m.g nice good job :D :D
  • 0

hardcor

hardcor22
Private
Private
 
Posts: 3
Joined: Mon May 02, 2005 11:29 pm
Location: warragul,australia
Reputation: 0

Unread postAuthor: rna_duelers » Wed Sep 28, 2005 12:03 am

Love the look of that polished copper..I am gunna make myself a coper marble gun..hungry for more muzle velocity...All i gota do now is learn to solder the parts the gether with out making another solderd part melt..Nice damage pics..absolutly carved up those cd's
  • 0

User avatar
rna_duelers
Major General
Major General
 
Posts: 1740
Joined: Mon Sep 26, 2005 7:07 am
Location: G-land Australia
Country: Australia (au)
Reputation: 1

Unread postAuthor: bubblebathman » Wed Sep 28, 2005 12:07 pm

i love the destrution pics :twisted: :twisted: :twisted: and the opper varnish idea great i should make on like it and mabye record the destrution on cam maybe :twisted: :twisted: :twisted: :twisted: :twisted:
  • 0


bubblebathman
Specialist
Specialist
 
Posts: 50
Joined: Thu Sep 22, 2005 12:45 pm
Location: USA
Reputation: 0

Unread postAuthor: Z0Z0 » Sun Nov 12, 2006 12:03 pm

nice damage pics

very nice, I sure like it

like bubblebathman said a video would be very nice

A+++++
  • 0

~Z0Z0

Z0Z0
Private
Private
 
Posts: 19
Joined: Mon Aug 14, 2006 12:00 am
Reputation: 0

Unread postAuthor: SpudStuff » Sun Nov 12, 2006 12:55 pm

PLEAST DO NOT KICK UP DEAD TOPICS!
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: POS » Sun Nov 12, 2006 4:03 pm

so stop answering them yourself.
  • 0

User avatar
POS
Major
Major
 
Posts: 395
Joined: Thu Sep 14, 2006 4:19 pm
Reputation: 0

Unread postAuthor: SpudFarm » Sun Nov 26, 2006 5:10 am

  • 0

Last edited by SpudFarm on Sun May 18, 2008 2:30 pm, edited 1 time in total.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Next

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'