paintball cannon

Just build a cannon and want to show it off? Post it in here.

Postby someguynamedchris » Thu Jan 18, 2007 11:15 am

<center>This is my
<font size="3"><b><u>Paintball Coaxial Piston Exhaust Cannon</u></b></font></center>

It has a <b>2â€Â
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Postby Freefall » Thu Jan 18, 2007 1:31 pm

Use HTML image tags, not forum code. It goes like this:

If you want to post the images, it's like this:
<img src="<b>image path</b>">

If you want to post links to the images (may be necessary for ImageShack links), do it like this:
<a href="<b>image path</b>"><b>de$criptive text</b></a>
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Postby BewareOfDog » Thu Jan 18, 2007 8:01 pm

Freefall, I really do think that most people are just too damn lazy! - I have no idea why I even chose to create a <a href="http://localhost/forums/viewtopic.php?t=13650">STICKY</a> about this.

someguynamedchris,
I did enjoy your post though- Very few people, if any, will bother to describe how they made their piston valve. - Thanks for all the info!

Edit:
Changed your image url's to hyperlinks- If you don't like it, let me know and I'll change it back to the original text.
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Postby Zorrowannabe9 » Thu Jan 18, 2007 10:43 pm

Could someone please tell me what 60 ft/lbs is in PSI? I really have no idea what that means. I had assumed that you meant pounds per square foot...but that comes out to like .4 PSI
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Postby SpudBlaster15 » Thu Jan 18, 2007 10:48 pm

Ft/lbs is a measure of muzzle energy.
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Postby wooffer » Fri Jan 19, 2007 12:04 pm

The bushing coming out of the bell reducer isnt even glued in the all the way. That, and its DWV. Its probably going to fail, and soon.
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Postby fullmetaljacket » Fri Jan 19, 2007 12:13 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Could someone please tell me what 60 ft/lbs is in PSI? I really have no idea what that means. I had assumed that you meant pounds per square foot...but that comes out to like .4 PSI<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Ft/lbs is the unit of measurement of projectile energy, which increases proportionally with projectile mass and exponentially with projectile velocity.

If you want to find out the ft/lbs your cannon is putting out, just enter the weight and speed of your projectile in any of many convenient <a href="http://www.on-targetrange.com/energy.shtml">online calculators</a>

edit: for example, if chris' projectile is travelling at 600 fps wtih 60 ft/lbs of energy, we can deduce that it weighs 4.861 grams ;)
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Postby Mr.Plow » Fri Jan 19, 2007 1:50 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by wooffer
[br]The bushing coming out of the bell reducer isnt even glued in the all the way. That, and its DWV. Its probably going to fail, and soon.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
It isn't in all the way because of the reduced socket depth on the reducer. Although using DWV in a pneumatic isn't a very good idea, I doubt we can predict when or even if it will fail.

As everyone can tell, I'm not a fan of sabre-rattlin' or doomsday-screamin' [:p]
It's not safe, but it's not a death warrant either.
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Postby someguynamedchris » Fri Jan 19, 2007 3:48 pm

Here is the <a href="http://img444.imageshack.us/img444/8917/dscf0610tu6.jpg">new exhaust set up</a>
It’s just a 2â€Â
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Postby clide » Fri Jan 19, 2007 3:57 pm

Where did you get the aluminum barrel? And is it just epoxied into the bushing?

The DWV reducer looks like it's only 2" to 1.5" so it is probably fine as long as it is properly solvent welded. Not that I endorse skimping on fittings, but if thats all he could find it's not extremely dangerous in this case.
Edit: Although I'm definitely not fond of the clean-out. Modified with a piston slamming into it.
I'm not sure what ft/lbs would be a measurement of, but I believe he, and the other people in this thread, meant ft*lbs.
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