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Colty's Great Thread

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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Colty's Great Thread

Unread postAuthor: colty-bear » Sun Jul 26, 2009 10:32 pm

ok so i have mostly been making pneumatics mostly since my dad does not approve of cumbustions so if i can only do pneumatics whenever and not only when my dad sleeps lol then i want to go all out


Nerf revolver like this one

http://www.spudfiles.com/forums/viewtopic.php?t=7694&

need some help i dont really know how they work so if someone could link or (besides HowStuffWorks the website dosent work on my comp) explain them i would really appreciate it

but i want to have a barrel after revolving disk ammo holder like his last picture.
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Unread postAuthor: inonickname » Mon Jul 27, 2009 4:49 am

The revosemi uses a cam like the nerf maverick or Solar's eclipse.

Google or trial and error.

Edited by jrrdw.
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Unread postAuthor: Moonbogg » Mon Jul 27, 2009 5:22 am

Maybe you could buy a real nerf revolver and see how it works then get ideas from it. Thats what I would do...maybe.
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Unread postAuthor: inonickname » Mon Jul 27, 2009 6:20 am

Yep, you could just grab a maverick off of ebay and pull it apart to see how it indexes et cetera.

Link

Or you could try PMing Solar. He isn't very active, and he has commercial interests so you may not get a reply, but if he's willing to help he could give you information on exactly what you're looking for.
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Unread postAuthor: Ragnarok » Mon Jul 27, 2009 7:44 am

As a hint, I suggest looking at pictures and videos of the Webley-Fosbery automatic revolver.
Aside from it being an epic piece of engineering, and one of my favourite firearm designs of all time, modifications on the idea are a good way of cycling rotary magazines.

The Eclipse uses a similar method, but based on the Mauser ZigZag revolver instead. The design makes it more complex to build, but means it cycles more conveniently.

Personally, if you don't need it to cycle like that (I suspect not), I'd go with the simpler Webley-Fosbery design. It's what I'm doing.
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Unread postAuthor: inonickname » Mon Jul 27, 2009 8:00 am

And a final suggestion, patents are an ideal place to begin searching.

That should set you moving I believe.
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Unread postAuthor: colty-bear » Mon Jul 27, 2009 12:57 pm

yea ill just have to do some searching then

ok i know i will get bashed for double posting but if i dont it will go old and instead i would have to make another topic so im going to start gathering parts and i am going to get a 1 sprinkler and 1/2 pvc for the darts shell but i still don't know how it works
what is he pumping thats firing?
how does air get into small tank behind sprinkler valve?
the wooden bolt shoots forward does it shoot back?
how is it revolving when he pumps?
how is the disk for darts staying in place ?
how is the sprinkler anchored to handle?
and how would i put a barrel after the dart cartridge?
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Unread postAuthor: inonickname » Thu Jul 30, 2009 3:36 am

what is he pumping thats firing?

A three-way valve, if we're thinking of the same thing.

how does air get into small tank behind sprinkler valve?

VIA the three way valve.

the wooden bolt shoots forward does it shoot back?

When the wheel rotates it probably forces the bolt back.

how is it revolving when he pumps?

Using a cam and indexing mechanism. You've had plenty of suggestions where to look. Hell, even pull apart an old cap gun.

how is the disk for darts staying in place ?

Magic

Wouldn't it be a little obvious that it's being held there?

how is the sprinkler anchored to handle?

Looks like clamps and spacers to me.

and how would i put a barrel after the dart cartridge?

Have it supported by the central part that holds the magazine. You'll need tight tolerances for effectiveness.


And now, a quote from a very wise man:
do some searching then
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Unread postAuthor: colty-bear » Fri Jul 31, 2009 9:53 pm

inonickname wrote:
what is he pumping thats firing?

A three-way valve, if we're thinking of the same thing.

how does air get into small tank behind sprinkler valve?

VIA the three way valve.

the wooden bolt shoots forward does it shoot back?

When the wheel rotates it probably forces the bolt back.

how is it revolving when he pumps?

Using a cam and indexing mechanism. You've had plenty of suggestions where to look. Hell, even pull apart an old cap gun.

how is the disk for darts staying in place ?

Magic

Wouldn't it be a little obvious that it's being held there?

how is the sprinkler anchored to handle?

Looks like clamps and spacers to me.

and how would i put a barrel after the dart cartridge?

Have it supported by the central part that holds the magazine. You'll need tight tolerances for effectiveness.


And now, a quote from a very wise man:
do some searching then



ok i donkt know what you ment by indexing and cam like mech and also he is pumping a blue and silver thing in the vid he called a slide valve and it fires and rotates the disk how and why? where can i get one? does the sprinkler chamber fill with the hose running to it?

i know im dragging this on but i want to get this done
my main concern is to find out the firing mechanism and how it is going to rotate after every shot

also people suggested buying a nerf maverik but i don't see the point when i am a member of spudfiles and have very inteligent people who know how to exactly how to make one




so body has ever made an animated diagram on how these preumatic revolvers work?

Edit:
cmon i need this answered so post i need to double post here i now have the sprinkler valve and the small chamber behind it and am working on a wooden bolt but will someone explain the revolving mech and the slide valve mech and where does the sprinkler valve hose run to?
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Unread postAuthor: Mr.Sandman » Sat Aug 01, 2009 10:34 pm

I think you should start off with a basic sprinkler valve cannon to get a feel for more powerful spudguns. Besides if you do actually make this the sprinkler is removable.
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Unread postAuthor: colty-bear » Sun Aug 02, 2009 1:19 am

i have already made a sprinkler cannon and a piston so i think im ready i also have a machine shop that i can use anytime just a short walk from the house
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Unread postAuthor: Ragnarok » Sun Aug 02, 2009 3:33 am

colty-bear wrote:I have already made a sprinkler cannon and a piston so I think I'm ready

It's not that simple. It's about what you understand, not what you've built.

Ok I don't know what you meant by indexing and cam like mech and also he is pumping a blue and silver thing in the vid he called a slide valve and it fires and rotates the disk how and why? where can I get one? Does the sprinkler chamber fill with the hose running to it?

I mentioned two examples of designs/patents you could look at for ideas for an indexing mechanism, and I see no evidence you've looked at either.

The slide valve (which you should be able to find with an internet search, they're also known as sleeve valves) is the main trigger. It's a form of three way valve. When forwards, it connects front and back. When back, it seals off the back, and vents the front to atmosphere.

Very useful for QEVs and piston valves, particularly repeaters.

It indexes the disk (indexing being sort of the fancy word for "rotating to the next position"), via a mechanism similar to the Webley-Fosbery, with a pawl in a specially cut track - converting the reciprocal motion into rotary motion.
The Webley-Fosbery uses recoil for the job of moving the pawl (technically, it moves the track past the pawl, but same difference), but many ideas based of it are manually cycled. The RevoSemi being one of them - where the pawl is connected to the slide valve.

I cannot stress this enough. Look at the Webley-Fosbery automatic revolver.

Also people suggested buying a Nerf Maverick but I don't see the point when I am a member of Spudfiles and have very intelligent people who know how to exactly how to make one.

Because it's often easier to see than read - it's research. Just think of it as research you have to pay for.
Heck, all of my early cannons now prove little more than "research I had to pay for".

Also, you might not realise this, but we're not here for the sole purpose of answering the questions of newcomers to the hobby in minute detail.
Thinking "I don't have to do any research, the guys on Spudfiles will have an answer" is both ignorance of the fact we all have other things to do, and rather rude, simply using us for your own interests.

You should perhaps also think about where we learnt this stuff from. You'd be surprised at how little of what I know about spudding and its science was stuff I learnt from Spudfiles (and even less of it was from questions I specifically asked).

The forum can only work because there are people who do their research from other sources.
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quick question

Unread postAuthor: colty-bear » Tue Aug 04, 2009 7:14 pm

i need just a female x female 1/4 one way valve thingy. i needs to flow in one end and not be able to flow back is it a check valve? do they make them in 1/4 metal?
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Unread postAuthor: Hotwired » Tue Aug 04, 2009 7:18 pm

AAAAAAAHHH!

Just make ONE thread and stick ALL your cannon design questions in there. You're posting a new thread for every single question.

But yes: Click here
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Unread postAuthor: Moonbogg » Tue Aug 04, 2009 7:35 pm

Yeah they have them at mc master. They are great. really tiny and high pressure ratings and only cost like 9 bucks.
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