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Copper Marble Cannon

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: MrCrowley » Wed Dec 21, 2011 10:23 pm

cometboy wrote:If you can give me instructions on how to post an image, I will do that.

http://www.spudfiles.com/forums/posting ... 13190.html

edit: fixed link
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Last edited by MrCrowley on Wed Dec 21, 2011 11:22 pm, edited 2 times in total.
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Unread postAuthor: cometboy » Wed Dec 21, 2011 11:13 pm

Kaleun,

Thanks for the link. It was broken, but I was able to locate the instructions from your input.

First shot with copper cannon.

Image

Projectile is a nylon cylinder 7 grams, 651fps, 120psi chamber.

The delay and aim are off, but better shots await.

Thanks again for the help building the thing. I hope I can get some good pictures.

Cheers.
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 22, 2011 12:08 am

cometboy wrote:The delay and aim are off, but better shots await.


Still several orders of magnitude better than any other spudfiles member was able to achieve, great shot!

Looking forward to more :)

Have you ever tried using multiple projectiles, shotgun style?
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Unread postAuthor: cometboy » Thu Dec 22, 2011 1:52 pm

Modeling clay. Same projectile, same speeds as the apple.

Image

Image

The ball was about 3.5 inches in diameter. For scale, the PVC post holding the targets is 1 inch wide.

Still not great pictures, but I am still trying to figure out whats going on. Unsurprisingly, the blunt projectile is transferring a crapload of energy to the target.

I still want to use a marble, but have not figured out the best way. Sabots tend to end up in the picture and screw things up.

We shall see.

Cheers.
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Unread postAuthor: cometboy » Thu Dec 22, 2011 3:23 pm

Image

A Squirt can full of Squirt gets exploded. I like the spray.

Cheers.
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Unread postAuthor: POLAND_SPUD » Thu Dec 22, 2011 3:50 pm

ohh my that does look nice



JSR jiz#### in his pants in 3... 2... 1...

:D
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Unread postAuthor: MrCrowley » Thu Dec 22, 2011 3:53 pm

Those are amazing.
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Unread postAuthor: cometboy » Thu Dec 22, 2011 3:57 pm

The flash I am using is fast.

A normal commercial flash like a Nikon or Canon is about 30 usec at lowest power.

The flash I cobbled together ( a copy of Harold Edgertons design) is 1 usec.

The nylon slug moves about .01" during that time, pretty near to blur free.

Cheers.
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Unread postAuthor: Brian the brain » Thu Dec 22, 2011 4:07 pm

WOW!
Those deserve a place on the front page!
Beautiful, even artful pictures.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: vardas » Thu Dec 22, 2011 6:14 pm

truly great pictures, looking forward to more. i was wondering if you would post a few pics of the cannon itself.
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Unread postAuthor: cometboy » Thu Dec 22, 2011 7:51 pm

vardas,

Thank you.

I will take a picture when I get a chance. The cannon is nothing special. I did not take any time to make it look nice as I want it only to take pictures.

My Flickr photo stream is here. I may not post everything here, but I do post good stuff there.

http://www.flickr.com/photos/8763834@N02/

Cheers.
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Unread postAuthor: pneumaticcannons » Thu Dec 22, 2011 9:49 pm

You're flickr account is truly amazing. Are you a professional? Great stuff really :)
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Unread postAuthor: mark.f » Thu Dec 22, 2011 10:29 pm

Very beautiful pictures!

Just curious, how are you triggering the flash unit? Some type of momentary switch on the target (a guy named plasticex009 used this method a very long time ago)?

Great job again, and:

Brian the brain wrote:Beautiful, even artful pictures.


I would hope so, being that I would most definitely qualify cometboy as an artist. :P
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 23, 2011 2:32 am

Image

Brilliant!

Sabots tend to end up in the picture and screw things up.


Some sort of shallow bolts or similar constriction in the muzzle could be sufficient to just slow the sabot enough that it would be out of shot.

Some relevant discussion here ;)
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Unread postAuthor: al-xg » Fri Dec 23, 2011 3:30 am

Ah, saw the blog post a few months ago, inspiring...
http://www.glacialwanderer.com/hobbyrobotics/?p=490


In fact that's one of the things that finally made me get an arduino :)
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