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Coin challenge reopen

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.
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Unread postAuthor: Crna Legija » Fri Feb 25, 2011 1:31 pm

what about 3 bolts going thought a coupling at the end of your barrel and you just adjust them so that the ammo hits dead center of the coin or find a big peace of metal the same thickness as a coin, it would even out the different coins in other countrys.
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Unread postAuthor: Technician1002 » Fri Feb 25, 2011 1:41 pm

Just a quick note. At the moment we are having record low temperatures, so I'm not planning any shots in the near future.
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Unread postAuthor: saefroch » Fri Feb 25, 2011 3:54 pm

I just attempted to put a hole in a US quarter with a deck nail, and missed. Wind gusts are horrible today, but I'm going to try again later with everything clamped down. The head of the nail clipped the quarter as it passed by and caused a small dent, but altogether unimpressive.
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Unread postAuthor: SpudFarm » Fri Feb 25, 2011 5:32 pm

what type of metal is is made of and how thick?

I haven't found specs on the coins yet but we do have coins that can remind of stainless steel that I will try later tonight.

Any limitations on ammo?

No, just post your results with pictures :)

especially if it's a relatively soft metal.

I will try harder coins, I doubt I cam make it through out "5 NOK" coin.

Any details of the launcher SpudFarm?

If I get the time to do another shot tonight I will get some pictures of the gun. I think I might have shown it here before though..


If you guys have the time and means (money) you could try different coins so that the next challenge is based on the hardest coin in the US, rules out us European poops though.
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Unread postAuthor: SpudFarm » Fri Feb 25, 2011 9:03 pm

I'm sorry to double post but this is adding information.

I tried the coin that I said reminded me of stainless steel, however a more thorough search yield the results that its not much difference in Norwegian coins.
I shot it anyway :)

To JSR;
The cannon has a 1m long 4mm ID (Meassured with ruler as it's late and I don't have a caliper at handy) brass barrel sleeved in a 4.75mm (Guess as I haven't seen a reason to measure) tube that was the original barrel for pellets.
The sleeve is not fixed in any way so I can quickly change the bore.

The valve consist of a bored out 1/4" brass nipple that the seat pipe (brass) is soldered into, the seat is halfway bored out so that my barrel can fit snugly inside but not go through.

Further down the valve you find a 3/8" Tee-fitting with a 3/8" steel pipe nipple in the end as a housing. This is bored out to so it can fit the piston that is the head from a umbraco screw with a rubber sealing face glued onto the side where the threaded part used to be. I used a file to make it flat after I cut of the threads so that the sealing face would have a surface for attachment.

Then there is the bad pilot that is the famous ball valve, and a slightly modified shock pump for filling.

Side note:
This cannon could be modified to fire semi or full auto, I will not talk more about this before I have done more tests to back it up.

Another side note:
Time - 03:00AM
Me - Tired after sleepeing for two hours the last two days and had to go shopping the entire day with my GF, you all know what it's like so don't complain on my explanation of the gun ;)

Vid:
[youtube]http://www.youtube.com/watch?v=Wy4SNEDc0Jg[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 26, 2011 12:44 am

Nice, I hadn't seen it before.

SpudFarm wrote:Tired after sleepeing for two hours the last two days and had to go shopping the entire day with my GF, you all know what it's like


I feel your pain, the last time I did that after the first fifteen minutes I wanted to stick my fist down my throat, rip out my trachea and use it to ironically asphyxiate myself.
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Unread postAuthor: SpudFarm » Sat Feb 26, 2011 9:02 am

Hmm, might post it later then.. Thought I have done that :?

I feel your pain, the last time I did that after the first fifteen minutes I wanted to stick my fist down my throat, rip out my trachea and use it to ironically asphyxiate myself.


Haha! Imagine getting up early in the morning to catch a train, then shop non-stop for about eight hours :O
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 26, 2011 12:36 pm

SpudFarm wrote:Hmm, might post it later then.. Thought I have done that :?


Can you find the link? I don't remember seeing it.

Haha! Imagine getting up early in the morning to catch a train, then shop non-stop for about eight hours :O


You would have read about me in the newspapers. Aren't you a bit young to be subjecting yourself to this abuse ;)
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Unread postAuthor: SpudFarm » Sat Feb 26, 2011 8:53 pm

Can you find the link? I don't remember seeing it.

I could not find it either so I guess it was never posted.

You would have read about me in the newspapers. Aren't you a bit young to be subjecting yourself to this abuse

Norway, land of the unthinkable!
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Unread postAuthor: ilovefire » Tue Mar 08, 2011 11:58 pm

just put my cane gun back together yesterday so i thought i would see what it could do, coin is 1.5mm copper and nail was 2.5mm wide, did kinda cheat because i put an air gun pellet behind the nail but at 400psi it went right up to the head
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