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self rifling pneumatic?

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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self rifling pneumatic?

Unread postAuthor: Demon » Fri Aug 29, 2008 3:54 pm

This is very strange...

I have a very simple pneumatic:

1 inch modded sprinkler valve with 1.25 inch x 2 foot air tank and canon.

but when i was cleaning the barrel i sawed little lines who where making perfect rifle lines... they are pretty deep: approx .5 mm by 1 mm(enough to upgrade of 10 % the range).

How could that happen?

Plz answer...
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Unread postAuthor: MaxuS the 2nd » Fri Aug 29, 2008 4:03 pm

What have you been using as ammo?
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Unread postAuthor: Demon » Fri Aug 29, 2008 4:04 pm

Only potatos, nothing else.
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Unread postAuthor: MaxuS the 2nd » Fri Aug 29, 2008 4:13 pm

This came up a short while ago.

I was going to say that if you were using something with a sharp edge, like a deoderant can then it would carve out a line or two. But a full set of rifling grooves? That would require something a little more solid than a potatoe.

Some projectiles spin as they travel down the barrel anyway, due to increased friction on one side or so.

Do you have any pictures?
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Unread postAuthor: Demon » Fri Aug 29, 2008 4:21 pm

I KNOW!!!! I already shooted a potato with rocks on it and it was stucked

in the barrel when i shooted, i was very angry because i thinked the

it was no more usable but the next day i tryed it again and maked

KA-POW and rocks disapered of my sight range fu*** rapidely(like a

shotgun blast). it is maybe that...the rocks where having sharp ends.

but the lines are perfectly the way it as to be rocks could not had made

that. Very strange...
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Unread postAuthor: jrrdw » Fri Aug 29, 2008 5:18 pm

What are you pushing the potato down the barrel with?
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Unread postAuthor: far_cry » Fri Aug 29, 2008 5:20 pm

do you have picture
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Unread postAuthor: Demon » Fri Aug 29, 2008 5:31 pm

Jrrdw:

a simple 1 inchx1 meter wood stick

Far_cry:

The rifle lines are pretty small a picture would not help(you will not see them).
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Unread postAuthor: iknowmy3tables » Fri Aug 29, 2008 6:03 pm

could one of the rocks you inserted have have a similar length to the barrel, only a bit longer so it could fit in the barrel only fit in a few ways
well my guess is that a rock went sideways during launch and happened to have an edge that was a little angled so it spun a little while grinding into the pipe
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Unread postAuthor: jrrdw » Fri Aug 29, 2008 7:23 pm

Maby that spud had a rock hard eye that gouged the marks in there. One on the way in, one on the way out.
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Unread postAuthor: SpudFarm » Fri Aug 29, 2008 8:06 pm

those thing is acctually really strange :S

then i fired a buckshot of small screws out of a 1" copper barrel they acctually pierced it.. so i don't think it could have been something really hard/big that caused it in PVC
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Unread postAuthor: VH_man » Fri Aug 29, 2008 9:43 pm

i actually tried to do this with a barrel once..........

it was a bunch of nails perfectly moulded in a hunk of epoxy......

problem was, they kinda ripped out of the epoxy and ripped the barrel to SHREDS.

all i can say is your lucky.........
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Unread postAuthor: Demon » Sat Aug 30, 2008 9:04 am

I think i am more lucky then you think VH-man: i looked in the barrel of
my crappy 1 inch ball valve canon and they are the same 5 perfects rifle line!!!

This is the most strang thing that never hapened in the spudgun history!
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Unread postAuthor: CasinoVanart » Sat Aug 30, 2008 9:30 am

This it not strange, i built a hybrid "hot three piece" that did the exact same thing.
I also made a thread about it, "self rifling ammo"
Yes it happens.
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Unread postAuthor: SpudFarm » Sat Aug 30, 2008 10:54 am

CasinoVanart wrote:This it not strange, i built a hybrid "hot three piece" that did the exact same thing.
I also made a thread about it, "self rifling ammo"
Yes it happens.


you fired tungsten carbide
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