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| MrCrowley |
 Posted: 06/30/2008 22:30 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 7619
4936.83 Spud Bux
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Wood, deodorant can, 1 1/4" coupler, hot glue...
I cover the former two in my how-to:
http://www.instructables.com/id/GolfballAntennaNerf-Cannon---Build-One -That-Shoo/
Because otherwise air will leak into the barrel as nothing is sealing the barrel. Because the chamber is getting sealed, air still can leak into the barrel. So by adding o-rings, the barrel is completely sealed off. Whereas in a barrel sealer, the barrel is already sealed so o-rings aren't required. |
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| Jleon |
| Posted: 09/29/2008 18:04 PM Post subject: |
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Private
Joined: 29 Sep 2008
Posts: 1
9.21 Spud Bux
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I've noticed that most of these pistons are 2 inches and smaller, is there a reason for that?
I was planning a barrel sealer with a 2 inch barrel and 4 inch chamber. My piston was going to be a 3 inch coupler, and that fits inside the 4 inch PVC pretty much perfectly. I haven't seen anything quite at that scale here.
So is it just really heavy? obscenely inefficient? or just ridiculously dangerous? |
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| Hotwired |
| Posted: 09/29/2008 19:20 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 2380
5691.67 Spud Bux
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No, no there's no limit.
There certainly are much larger than 2" pistons around, I can think of a 90mm one off the top of my head but it's buried in the showroom somewhere. Even larger ones are about.
It just gets more expensive as you build bigger cannons.
There's the cost of building at a larger scale, the kind of recoil which can smash the plastic to bits if not dealt with plus the heavy air consumption of very large cannons to consider.
Oh yes and they're bloody noisy  |
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| MrCrowley |
| Posted: 09/29/2008 19:32 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 7619
4936.83 Spud Bux
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| Jleon wrote: | I've noticed that most of these pistons are 2 inches and smaller, is there a reason for that?
I was planning a barrel sealer with a 2 inch barrel and 4 inch chamber. My piston was going to be a 3 inch coupler, and that fits inside the 4 inch PVC pretty much perfectly. I haven't seen anything quite at that scale here.
So is it just really heavy? obscenely inefficient? or just ridiculously dangerous? |
There are three 4" piston valved cannons I can think of, of the top of my head. So i'm sure there are more. Just use the forum search tool, and limit the results to the Pneumatic Cannon Showcase and search 4" or similar, sure you will get some dud results but shouldn't be much. |
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| jamie e |
| Posted: 01/04/2009 19:49 PM Post subject: |
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Private
Joined: 27 Dec 2008
Posts: 23
50.74 Spud Bux
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AWESOME that helps so much, i've been wondering how they work for so long  |
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| NetherPhoenix |
| Posted: 04/21/2009 17:51 PM Post subject: |
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Private
Joined: 20 Apr 2009
Posts: 4
13.72 Spud Bux
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| Wow, this was super helpful, really made it easy to understand how everything works out |
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| Bully Dog Airsoft |
| Posted: 07/20/2009 17:54 PM Post subject: |
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Private
Joined: 28 Sep 2008
Posts: 13
25.40 Spud Bux
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| Can someone tell me how to make video semitics like this? |
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| Ragnarok |
| Posted: 07/20/2009 18:28 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 4809
14788.25 Spud Bux
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Semitics? As in the study of the languages, cultures and histories of the Semitic people?
I can't even work out what word you actually meant.
Anyway, dude. This is a topic on piston valves, not making Flash animations.
But to save an argument, you'll need Adobe Flash (not Flash Player) to make this kind of thing. Prices for the new versions are into hundreds of dollars. Old versions might be found for less, but you can still expect to have to shell out a certain amount.
We will not be discussing illegal methods of getting the software.
End of discussion. I've told you what you need to know. If you need to know more, ask it somewhere appropriate. In other words, not in a thread about piston valves.
(In other words: NOT HERE {In other words: SOMEWHERE ELSE [In other words: THIS REALLY IS NOT THE PLACE]} - Got it?)
@Colty-bear: It's generally considered that with sticky threads that there's no problem with posting them, no matter the time scale involved. After all, it's always on the front page!
As you're not a moderator, it's not really your place to be rebuking people for it anyway.
Of course, that doesn't mean that Bully Dog's question was appropriate to the topic of the thread. |
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| Mateo |
| Posted: 07/20/2009 18:39 PM Post subject: |
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Sergeant
Joined: 21 Oct 2007
Posts: 80
191.23 Spud Bux
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i think he meant schematics? ragnarok is right this really isnt the place for a question like that... have you noticed that this forum is filled with how to make spudcannons and related items?
and ways if you really wanna know just copy and paste this into you nearest local google (dont worry google is your friend  )
"how to make flash animation"
now was that very difficult? |
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| Ragnarok |
| Posted: 07/20/2009 18:56 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 4809
14788.25 Spud Bux
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| Mateo wrote: | | I think he meant schematics? |
Probably. It is almost two in the morning here. I blame that.
| Quote: | if you really wanna know just copy and paste this into you nearest local google (dont worry google is your friend)
"how to make flash animation"
now was that very difficult? |
That's not how you do it. This is how you do it: Clicky
(Feel free to use that website. Just be wary, people can get quite annoyed if when you do...)
But to be fair to him, he probably didn't know it was called Flash animation. |
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| Mateo |
| Posted: 07/20/2009 19:07 PM Post subject: |
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Sergeant
Joined: 21 Oct 2007
Posts: 80
191.23 Spud Bux
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| Quote: | That's not how you do it. This is how you do it: Clicky
(Feel free to use that website. Just be wary, people can get quite annoyed if when you do...) |
wow that is the most amazing thing ive ever seen ahah.
im just irritated right now and im blaming the 105 degree wheather  |
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| jackssmirkingrevenge |
| Posted: 07/20/2009 21:04 PM Post subject: |
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T L A R
Joined: 15 Mar 2007
Posts: 12547
21070.94 Spud Bux
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| Ragnarok wrote: | | But to be fair to him, he probably didn't know it was called Flash animation. |
Sounds rather posh as opposed to normal, bog standard animation |
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| =Dark Wing= |
| Posted: 07/22/2009 15:57 PM Post subject: |
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Private
Joined: 22 Jul 2009
Posts: 1
5.41 Spud Bux
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| What might you use as a piston? |
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| MrCrowley |
| Posted: 07/22/2009 16:26 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 7619
4936.83 Spud Bux
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| =Dark Wing= wrote: | | What might you use as a piston? |
You could use your grandma's toe if you can get hold of it 
You can use ANYTHING as a piston. Every piston is different. Just go to a hardware store or look around your kitchen or garage for something that could be used as a piston. You didn't even say what size piston, so I don't see how you could expect any help. |
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| bazooka joe |
| Posted: 07/28/2009 16:00 PM Post subject: |
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Private
Joined: 25 Jul 2009
Posts: 7
27.93 Spud Bux
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Ok, I've been having some issues with my first piston valve not sealing correctly. I made a coaxial with a 2 inch barrel and a 3 inch chamber, and used a longboard wheel with a couple sheets of cut rubber for the sealing face as a piston, but it doesn't seal. Whenever I put air into my launcher it all just leaks out the barrel at just a slightly slower rate then my compressor filling it. I can get it to 40 psi but its gone within 10 seconds or less.
Can anyone help me with this? I figured since this was a discussion about pistons that I could post this here. I can post pictures if needed.
Thanks in advance |
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