Copper Marble Cannon

[MrCrowley]

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

[cometboy]

Kaleun,

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

First shot with copper cannon.



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.

[jackssmirkingrevenge]

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?

[cometboy]

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





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.

[cometboy]

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

Cheers.

[POLAND_SPUD]

ohh my that does look nice

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

[MrCrowley]

Those are amazing.

[cometboy]

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.

[Brian the brain]

WOW!
Those deserve a place on the front page!
Beautiful, even artful pictures.

[vardas]

truly great pictures, looking forward to more. i was wondering if you would post a few pics of the cannon itself.

[cometboy]

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.

[pneumaticcannons]

You're flickr account is truly amazing. Are you a professional? Great stuff really

[mark.f]

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:

Beautiful, even artful pictures.

I would hope so, being that I would most definitely qualify cometboy as an artist.

[jackssmirkingrevenge]

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

[al-xg]

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