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A Good Tutorial For Beggining Spudders

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: mark.f » Thu Feb 26, 2009 12:46 pm

Alright, as long as you feel safe doing it. I just don't like those segmented blades, and prefer to use regular utility blades for cutting.
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Unread postAuthor: suburban spudgunner » Thu Feb 26, 2009 7:35 pm

MRR wrote:The reason why I never posted it on spudfiles is because I think it's still pretty basic stuff.


Then I can't wait to see what you think is complicated.

This was really helpful: I didn't understand anything about piston valves before seeing those videos.

Maybe I'll make a new gun this summer...
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Unread postAuthor: covey12 » Sun Mar 01, 2009 9:18 pm

so pistons are the same principles as a spinkler valve basically
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Unread postAuthor: SpudsMcGee » Sun Mar 01, 2009 11:17 pm

Not really, a sprinkler opens to release the air. A piston is pulled back to release the air. I suppose you could say they are similar, but only on the principle of them releasing air to fire a projectile (if that is what your saying). Aren't I smart? (Rhetorical Farley!)
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 02, 2009 12:38 am

SpudsMcGee wrote:Not really, a sprinkler opens to release the air. A piston is pulled back to release the air. I suppose you could say they are similar, but only on the principle of them releasing air to fire a projectile (if that is what your saying). Aren't I smart? (Rhetorical Farley!)


They're more related than that. In a piston valve, the pressure differenceb etween pilot and main chamber forces the piston back and therefore opening the valve. In a sprinkler valve, the same concept applies, though the piston is replaced by a flexible diaphragm.
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Unread postAuthor: inonickname » Mon Mar 02, 2009 1:25 am

* and a sprinkler valve doesn't have to be filled from a pilot, whereas a piston usually does.
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Unread postAuthor: Ragnarok » Mon Mar 02, 2009 6:01 am

SpudsMcGee wrote:A piston is pulled back to release the air.

No it isn't. Pistons do not get sucked back - they get pushed back by pressure difference.

Vacuums do not suck - they simply fail to provide a counter force for pressure. That is - things are not pulled into vacuums - they're pushed into them.

This is a frequent misunderstanding that results in us having to explain why someone's "awesome new piston valve design" won't work.
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Unread postAuthor: Anwarboy11 » Thu Mar 05, 2009 5:02 pm

starman wrote:That is very well put together...makes me want to make one just like it. Does anyone know if MrRedRooster is a member here under another name maybe?

Thanks for the pointer Sandman!

Yh his username is MRR :lol:
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Unread postAuthor: Mr.Sandman » Tue May 05, 2009 4:26 pm

jackssmirkingrevenge wrote:On a slight tangent:

A fat lot of you think of JSR as a funny laid back person.......... but dont get him mad as he'll epoxy the hell out of you!


... where did that come from? :?


I dont really know i was bored one day and thought i might use some of my liberal humor and enlighten my day........too bad it worked :D
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Yeah, it's that important.
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Unread postAuthor: CpTn_lAw » Tue May 05, 2009 4:46 pm

There are ways to better this valve though. Reduce the dead volume, reduce de piston travel distance, a better pilot valve.
Still, very interesting design, very close from mine ^^. (i'm not saying mine is übercool although it is)
I really have to get a CO2 fire extinguisher.... :roll: 800 psi of fun.... :D
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Unread postAuthor: MRR » Wed May 06, 2009 11:25 am

I know that the gun in the video is not perfect but is works.

I already made a lot of fine tuning and experiments with piston designs. My new valves are no comparison to this old version.
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Unread postAuthor: CpTn_lAw » Wed May 06, 2009 11:38 am

I was not saying it wasn't good :D It was damn good! But you know...you can always push a little more ^^
I just did a 20 bars shot with a short .40 barrel...my god my ears are still ringin!
makes me think....my remington propels the 150 grains ball at 950 fps where my piston un propels it at 450 fps using 300 psi. there are chances using 600 psi the ball could go very fast!

I'll make tests
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