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auto piston v3.0

A place to ask general spud cannon related questions.
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Unread postAuthor: Skywalker » Thu Jan 03, 2008 8:52 am

Yeah, that'd about do it! So, who's building? lol
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 9:11 am

excluding the option of the spring loaded ball at the entry point, it's close to my last design in the other thread.
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Unread postAuthor: Ragnarok » Thu Jan 03, 2008 1:27 pm

Skywalker wrote:Yeah, that'd about do it! So, who's building? lol

I'm sorely tempted to make a version of the valve, but I've never made an auto breech before, so I'm not quite so sure about that part of it.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 2:56 pm

You've made other things very well, I'm sure the blow forward design would be well within your construction capabilities.
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Unread postAuthor: Ragnarok » Thu Jan 03, 2008 3:10 pm

That wasn't my primary concern, the reason I have never done such a thing before more lies in choice of ammunition, because I can't think of any spherical round I can get my hands on in reasonable quantities that is a sufficently good fit in any common size of copper pipe.

That's why all my semi ideas have been shell ejectors.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 3:15 pm

um... marbles, surely?
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Unread postAuthor: Ragnarok » Thu Jan 03, 2008 4:35 pm

jackssmirkingrevenge wrote:um... marbles, surely?

Afraid not. The sizes I can get won't fit 15mm copper, and they're too loose in 22mm, sizes in between are rare, and expensive.
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Unread postAuthor: Hotwired » Thu Jan 03, 2008 4:45 pm

The small marbles seem to be about 15-16mm and I seem to have lost all the larger ones I had.

Marbles seem to be ammo for every other country but ours.
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Unread postAuthor: Ragnarok » Thu Jan 03, 2008 5:14 pm

Hotwired wrote:Marbles seem to be ammo for every other country but ours.

That about sums it up. I can use them in 22mm pipe with plastic bag as wadding, but the only way they'll go down 15mm is smashed into pieces.
Most of my marbles are just a smidgeon smaller than a paintball, so they'd be great in the rare 20mm copper, which has an ID just over 0.3mm more than a paintball, but they're too loose in 22mm for them to go through a blow-forward loader without jams or multiple feeds.

I do have some 1/2" ball bearings which fit passably in 15mm pipe, but I don't particularly want to fire those as I need them for other purposes.
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Unread postAuthor: Hotwired » Thu Jan 03, 2008 5:27 pm

Ragnarok wrote:I can't think of any spherical round I can get my hands on in reasonable quantities that is a sufficiently good fit in any common size of copper pipe.


Actually I have a personal dislike for spherical ammo so I've deliberately avoided them.

Makes life a lot harder when it comes to designing mechanisms as spherical ammo just needs a simple hole drilled but a cylindrical projectile is a right git as it needs a rectangular slot.
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Last edited by Hotwired on Thu Jan 03, 2008 9:40 pm, edited 1 time in total.
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Unread postAuthor: Ragnarok » Thu Jan 03, 2008 9:09 pm

Hotwired wrote:Actually I have a personal dislike for spherical ammo so I've deliberately avoided them.

I don't have a problem with as such, but I don't particularly like building any launcher so it is restricted to just one or two types of ammunition, which loaders solely for spheres will do.
I'm prepared to make such a sacrifice for things like airsoft pellets, or gauss guns, but I'm not half as happy making a launcher that can only handle paintballs, marbles, and an expensive variety of steel ball bearings.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 04, 2008 12:29 am

I've always had 0.22 pellets as my intended ammo, hence the effort to create such loading mechanisms as opposed to clouds and vortexes.
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Unread postAuthor: ALIHISGREAT » Fri Jan 04, 2008 5:46 am

Ragnarok wrote:
jackssmirkingrevenge wrote:um... marbles, surely?

Afraid not. The sizes I can get won't fit 15mm copper, and they're too loose in 22mm, sizes in between are rare, and expensive.


you could use a pvc barrel? there is some 12bar rated 22mm pvc from B&Q that supposedly fits paintballs perfectly, i have some but i haven't tested it out yet and spanerman used it as a barrel on his copper paintball gun a while back.
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Unread postAuthor: Skywalker » Mon Jan 21, 2008 9:27 am

Ok, here's my idea for making my version of the gun. It shouldn't cost all that much, and should be relatively easy to build. And it should be simple to repair.

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How bout it?
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Unread postAuthor: Brian the brain » Mon Jan 21, 2008 11:28 am

16 mm marbles fit into 20 mm aluminium tube, wich in turn can be epoxied into 22 mm.

The large 1" marbles fit into 28 mm copper.
I used that on the sawed-off.

Ball bearings of about 9-12 mm in diameter would be a better choice for ammo, I think.
Marbles differ in size to much and I find them a little too large to use in full auto.
Bigger caliber means more gas to propell them.( although fun, CO2 is a bit too expensive to waste in large quantities)
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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