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UPDATED TODAY: Schmanman's steel piston rifle

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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UPDATED TODAY: Schmanman's steel piston rifle

Unread postAuthor: schmanman » Sun Jan 06, 2008 7:51 pm

this thing works so good now! this piston has lasted for over 100 shots, and is still going strong! this sucker is so accurate that I shot a stray paint can out of a tree from 50 feet away, just sighting by eye, no scope or anything. I shot a nail into a pre-drilled hole from 20 feet awa, the hole was about an eighth inch diameter...

at about 120 psi, it shot an unsharpened nail through a fileing cabinent door, from 15 feet away, no problem. those are not thin, beleve me.

it also shot nail after nail through a fireproof cabinent made of 16th inch steel, no problem.
I put a sharpened pencil through a piece of 1/2 inch plywood.
it make my hand bleed from a dry fire (metal shavings from a recent modification)

I'll post some vids..... eventually.....

and I'll paint it flat black or olive drab

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the stock looks much more shiny in person, it's chrome.

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the double length "sniper barrel" (I like the short one better)

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the piston...

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the sharpened nails I shoot every once and a while.....

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the adaptor I made so I could fill it up with a bike pump, or a compressor

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without the adaptor

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Last edited by schmanman on Sat Jan 12, 2008 9:36 pm, edited 6 times in total.
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Unread postAuthor: Velocity » Sun Jan 06, 2008 7:53 pm

Haha I think its the same picture every time... but that stock looks beautiful.
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Unread postAuthor: schmanman » Sun Jan 06, 2008 7:57 pm

thanks!

ok, it's fixed.

the stock is part of a exaust heat guard from a 70's 125cc suzuki enduro, slightly flattened, and cut in half, with part ground off.

the part on the very back of the stock is a peice of plastic from the inside of a handdgrip from a clutch (the plastic part the foam's on) with a slot cut in it.
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Unread postAuthor: cwazy1 » Sun Jan 06, 2008 8:08 pm

lol why are all yours fittings rusty and nasty?!?
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Unread postAuthor: schmanman » Sun Jan 06, 2008 8:11 pm

because it actually gets used, and most of the time is stored out in the barn. It'll look better painted.


none of them have dirt or rust on them, it's the combination of pipe wrench marks, old paint on some fittings and not on others, and the combination of black steel pipe and fittings and galvanised steel pipe and fittings
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Last edited by schmanman on Sun Jan 06, 2008 8:13 pm, edited 1 time in total.
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Unread postAuthor: DYI » Sun Jan 06, 2008 8:12 pm

Schmanman, that "sniper" barrel looks a bit bent :lol:

cwazy, schmanman's piston rifle has never looked new, not even when it was new. I suspect that it's built out of mostly old parts that were lying around.

I'm glad that you finally got a decent looking stock on that thing, and look forward to seeing the SWATv4.0, whenever that happens.
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Unread postAuthor: Novacastrian » Sun Jan 06, 2008 8:14 pm

I like you cannon very much, it looks like it could handle some serious pressure and should look even better after you paint it olive drab.
Maybe even a simple camouflage.
Nice work with the adaptor too.

Edit: DYI, that barrel is for long distance shots i suspect :D
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Last edited by Novacastrian on Sun Jan 06, 2008 8:15 pm, edited 1 time in total.
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Unread postAuthor: Mitchza89 » Sun Jan 06, 2008 8:15 pm

That gun looks absolutely tops mate. Job well done. Question though....What the hell is the piston made out of? :?
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Unread postAuthor: schmanman » Sun Jan 06, 2008 8:16 pm

thanks...

my grandpa has a bucket of pipe parts he god from scrap cars on the rail road. the fittings, like the tee the valve is in, are off high pressure lines from the general motors plants and facotries in pontiac and detroit about 50-60 miles away. they are very thick, and rated to extremely high pressures. and there are some new ones on there too. :wink:


EDIT:

thanks guys!....

the long barrel is really nowhere near as bent as it looks in the pictures, it was the angle I took the picture from, and that barrel is mostly used for distance shots. nice guess..... 8)

the piston is made from a rubber cap they put on high qualty steel dowel rods at some specialty places, which is a extremely hard rubber/medium hard plastic, wih a 9 mm diameter spent rifle shell inside for ridigity, wrapped in hockey grip tape untill I find time to cast epoxy around it to replace the tape, although the thap has worked awesome so far.



Jack! notice, no feet in the pictures!!! :lol:
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Unread postAuthor: elitesniper » Sun Jan 06, 2008 8:29 pm

thats really nice, does that piston leak through the barrel a little?
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Last edited by elitesniper on Sun Jan 06, 2008 8:45 pm, edited 1 time in total.
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Unread postAuthor: Skywalker » Sun Jan 06, 2008 8:41 pm

Nice! I've liked all the re-incarnations of this gun so far. :D How do you get the barrel to pass inside the T for the piston to seat against? (I'm thinking about working in steel for the first time, so I'm looking for pointers.)
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Unread postAuthor: mopherman » Sun Jan 06, 2008 9:15 pm

Skywalker wrote:Nice! I've liked all the re-incarnations of this gun so far. :D How do you get the barrel to pass inside the T for the piston to seat against? (I'm thinking about working in steel for the first time, so I'm looking for pointers.)

Usually when working with threaded pipe, you screw a small nipple into the "wrong" end of the reducer for the piston to seal against. Some people also use dilled out compression fittings. You could also make a short, "toolies style" pisto that seals against the back of a reduce bushing.
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Unread postAuthor: Carlman » Sun Jan 06, 2008 11:28 pm

noice one mate! I was thinking of making a steel gun soonish so this gave me some ideas...

I love the stock also :D
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Unread postAuthor: TwitchTheAussie » Sun Jan 06, 2008 11:33 pm

All I can say Holy F*cking Sh1t thats nice :P
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Unread postAuthor: Pyro Ninja » Mon Jan 07, 2008 12:29 am

Nice..
The piston looks like its made out of a small tap washer.
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Pretty good quality for a mobile pic :)
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