300 psi+ Piston rifle

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Mon Apr 27, 2009 12:16 pm

Hello guys!!

I'm here to present to all of you, my newest build, a (relatively) high-pressure,barrel-sealing, piston pneumatic rifle ! Now, this is my first homemade piston rifle and i'm still running into problems, to name some there're piston lube probs, exhaust ones, as my current exhaust is a 180 psi rated blowgun, wich i'm afraid to submit to more. So in future improvements, i might put some kind of spring-loaded ball-valve exhaust.
The chamber is 1" steel, the valve is a homemade 3/4" piston one. The piston is hot glue poured into a 20 mm copper pipe with grease on the inner-wall. I also put a neoprene disc on top of it with a screw that goes all-the-way to the bottom.

The gun is pressurized using a schrader valve with the inside removed, and secured with a 1/2" steel ball-valvle.
Some speed indications (not exactly accurate but give you an idea) All of these are tested at 14 bars (200 psi)
-6mm
Airsoft BB 0.25 gram : 294 m/s
Glass BB 0.16 gram : 322 m/s
Steel BB 0.88 gram : 254 m/s
Steel bolt 0.55 gram: 270m/s

Little Specs:

Chamber : 1" steel
Valve : 3/4" piston; homemade.
Barrels : 1m x 6.02 mm ; 1m x 15mm ; 40cm x 1cm ;

And i also made a video, be sure to watch it in HQ . There will be more to come when i pass my exams! until then, have fun and be safe ;)

[youtube][/youtube]
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
Carlman
Staff Sergeant 2
Staff Sergeant 2
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Been thanked: 2 times

Mon Apr 27, 2009 12:27 pm

Wow man thats really nice, looks like it has quite a kick too!

Love the shot of the projectile going toward the tree!

Keep up the good work!
Image
Aussie spudders unite!!
User avatar
VH_man
Staff Sergeant 4
Staff Sergeant 4
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Been thanked: 1 time

Mon Apr 27, 2009 12:36 pm

Im sure Ive asked this before, but what do you use as a high-speed camera?

I like it. Simple. Any chance on a view of the internal parts of the piston valve? I'm interested in how you did it.
User avatar
Carlman
Staff Sergeant 2
Staff Sergeant 2
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Been thanked: 2 times

Mon Apr 27, 2009 12:39 pm

Most probobly a 1" brass T, 1" to 3/4" bushing, 3/4" hose nipple, 3/4" pipe nipple and then adapters to the blowgun.

Well thats how my new one is anyway.
Image
Aussie spudders unite!!
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Mon Apr 27, 2009 12:52 pm

Lol, it's not that it has some kick, but you actually feel it going back a bit.
The valve is a 3/4" tee, it's all in the description. i used 3/4" => 1/2" bushings and a 1/2" hose barb, with superglue in the thread so that it doesn't move and is airtight.
My camera is a casio EX-F1 ;)
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
VH_man
Staff Sergeant 4
Staff Sergeant 4
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Been thanked: 1 time

Mon Apr 27, 2009 12:54 pm

howd you get the hose barb to mount in backwards though? Or am i missing something.
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Mon Apr 27, 2009 12:59 pm

I just screwed it in. ;)
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
VH_man
Staff Sergeant 4
Staff Sergeant 4
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Been thanked: 1 time

Mon Apr 27, 2009 1:27 pm

but its backwards!

Im just going to have to try it I guess...... its always boggled my mind though.
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Mon Apr 27, 2009 1:35 pm

The threads do not stop flat ;) You can reverse it and put it backwards. I just shot a pellet at 200 psi...my god how fast it went!! :shock: It's just amazing XD
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
Gippeto
First Sergeant 3
First Sergeant 3
Venezuela
Posts: 2504
Joined: Sat Jan 19, 2008 10:14 am
Location: Soon to be socialist shit hole.
Has thanked: 2 times
Been thanked: 17 times

Donating Members

Mon Apr 27, 2009 1:35 pm

Excellent video! :) Liked the "spinning"can shot the best. :D
"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
covey12
Specialist 2
Specialist 2
Posts: 260
Joined: Sat Aug 23, 2008 4:36 pm

Mon Apr 27, 2009 1:38 pm

really cool, i like it, im guessing its a little to powerful for airsoft matches lol, at 0:43 what was your target, did you just shoot through a tree with an airsoft bb? and where do you get the glass bbs?
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Mon Apr 27, 2009 1:43 pm

At 0:43, the projectile is a 1gram fruit, you could flatten it between your fingers; the target is a shipping cardboard tube. the walls are 4 millimeters. I was actually surprised it did it through lol ^^
yeah, above 2 joules, AEG's tend to hurt a lot, i'm developping more than 15 joules with it at 200 psi.
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
far_cry
Specialist 3
Specialist 3
Posts: 317
Joined: Wed Aug 20, 2008 3:59 pm

Donating Members

Mon Apr 27, 2009 2:11 pm

nice gun man
but you shouldn't edit it with any sound track WE MUST HEAR THE BANG CLEARLY
i loved the shoot at the tree SLOWMO paint ball :D :D :D :D
when you test it with higher pressures like 600 psi. the blow gun can hold this pressure don't wary

and i want to buy like you camera EX-F1 can you film a 1 min video (full HD non encoded ) and upload it rapidshare and send me the link. i wanna see the quality
Last edited by far_cry on Mon Apr 27, 2009 2:12 pm, edited 1 time in total.
ImageImage
User avatar
Moonbogg
Staff Sergeant 3
Staff Sergeant 3
United States of America
Posts: 1733
Joined: Mon Oct 13, 2008 10:20 pm
Location: SoCal
Has thanked: 160 times
Been thanked: 100 times

Mon Apr 27, 2009 2:12 pm

Dude 1:25 & 1:38 were SWEET! Nice gun. Looks like fun to shoot.
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Mon Apr 27, 2009 2:29 pm

Loool thanks guys! i'm gonna push it to 300 psi, with a couple cushions on the blow gun....
I will do a 1min 720p footage, and send it to you, but i warn you, it's really big files...the quality is great, but the fact you don't have a wide angle is kinda f***ed up in HD...

I'm worried about the blowgun though...it's light for a blowgun and the metal doesn't seem very sturdy...well, if it won't hold the 300 psi, i'll switch back to the 380 psi rated steel ball valve :D


Edit, just shot it dry at 300 psi with the blowgun. It's kinda hard to push the trigger but it does it! way to go supersonic again!!! hahaha
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
Post Reply