Search found 137 matches

by Alex345
Sat Mar 12, 2016 7:54 am
Forum: Ammo & Parts
Topic: Suitable valve for piston-hybrid?
Replies: 4
Views: 1507

Re: Suitable valve for piston-hybrid?

I can't seem to install any of those programs... I've already started adapting the valve, I'll post an update soon.
by Alex345
Sat Mar 05, 2016 8:48 am
Forum: Ammo & Parts
Topic: Suitable valve for piston-hybrid?
Replies: 4
Views: 1507

Re: Suitable valve for piston-hybrid?

Thanks for replying. The pilot and chamber are in no ways connected, as you can see, the chamber sealing face of the piston is larger then the sealing face on the pilot side. So the pilot pressure needs to be slightly higher than the chamber pressure in order to keep the valve shut. Before i knew th...
by Alex345
Fri Mar 04, 2016 4:08 pm
Forum: Ammo & Parts
Topic: Suitable valve for piston-hybrid?
Replies: 4
Views: 1507

Suitable valve for piston-hybrid?

Hey guys, i'm thinking of turning my pneumatic piston cannon into a piston-hybrid. Already got a shorter chamber, but i'd still like a second opinion on the valve i would like to use as it is a pre-made valve instead of a custom built one. I'm thinking of increasing the pilot hole from 1/8 to 1/4, d...
by Alex345
Fri Feb 19, 2016 6:37 am
Forum: Pneumatic Cannons
Topic: Arrow shooting sniper airgun (work in progress)
Replies: 10
Views: 2321

Re: Arrow shooting sniper airgun (work in progress)

Nice! Reminds me of the FX verminator that shoots arrows :D Chamber looks a bit large for such a small barrel. Would you consider using a hammer valve instead of the solenoid valve? I like using valves from very old pre-charged nu-swift powder fire extinguishers. If you remove all the junk you basic...
by Alex345
Thu Feb 18, 2016 12:25 pm
Forum: Pneumatic Cannons
Topic: First test shots!
Replies: 2
Views: 729

Re: First test shots!

The valve has always been a bit of a mystery... I found it in a junk store and basically paid for the weight of the brass. It has no brand or markings other than a code indicating what type of brass it's made from. Here's a link to a topic i started after i bought it http://www.spudfiles.com/materia...
by Alex345
Fri Feb 12, 2016 4:50 pm
Forum: Ammo & Parts
Topic: Fin stabilized and/or sub-caliber ammo?
Replies: 8
Views: 2341

Re: Fin stabilized and/or sub-caliber ammo?

Well I've recently made one of these when i was bored.
round2.jpg
round1.jpg
It's sub-caliber, so i still need a way to shoot it out of my cannon
by Alex345
Fri Feb 12, 2016 10:52 am
Forum: Hybrid Cannons
Topic: A heavy 75x hybrid
Replies: 19
Views: 5134

Re: A heavy 75x hybrid

Jesus christ, this thing is gonna be awesome! You thinking of putting a muzzle brake on her? Unless you're gonna shoot APFSDS like rounds.
by Alex345
Wed Feb 10, 2016 12:41 pm
Forum: Pneumatic Cannons
Topic: First test shots!
Replies: 2
Views: 729

First test shots!

Ok so i tried making this post 3 times in a row, accidentally closing this page and losing all i wrote twice... Third attempt, i don't feel like writing it all again so here's some pwetty pictures! Since there is little description of the gun, feel free to ask anything and i will happily answer! Now...
by Alex345
Sat Jan 23, 2016 4:03 pm
Forum: Pneumatic Cannons
Topic: At a loss here... Pressurizing my cannon
Replies: 11
Views: 1764

Re: At a loss here... Pressurizing my cannon

And it works! Just shot a rolled up washcloth at almost 20 bars! Made the cannon jump up quite a bit too :D It fills the very small pilot in a snap, but the chamber just takes for ever tho... It would awesome to find 2 exact same compressors and hook them up together for twice the filling speed. May...
by Alex345
Sat Jan 23, 2016 7:53 am
Forum: Pneumatic Cannons
Topic: At a loss here... Pressurizing my cannon
Replies: 11
Views: 1764

Re: At a loss here... Pressurizing my cannon

Oh ok i thought it was some kind of anti-overheating sensor, that's why i touched the housing to see if it was warm :) Since a lack of oil can cause overheating.
by Alex345
Thu Jan 21, 2016 1:29 pm
Forum: Pneumatic Cannons
Topic: At a loss here... Pressurizing my cannon
Replies: 11
Views: 1764

Re: At a loss here... Pressurizing my cannon

hmm, the space where the spring would need to be placed is already very tiny tho. But, i looked at the compressor again after what you said about the thermal device and i found a small round piece of plastic that was in no way connected to the compressor. It just hugged the outside of the housing......
by Alex345
Wed Jan 20, 2016 5:31 pm
Forum: Pneumatic Cannons
Topic: At a loss here... Pressurizing my cannon
Replies: 11
Views: 1764

Re: At a loss here... Pressurizing my cannon

Because of the pressure difference, the pilot and chamber are not connected to each other. I could connect them with a piece of copper line, but there would need to be a regulator in between them. But the main problem is finding a pressure source... Would it be safe to hook it up to the 300 bar tank...
by Alex345
Mon Jan 18, 2016 12:15 pm
Forum: Pneumatic Cannons
Topic: At a loss here... Pressurizing my cannon
Replies: 11
Views: 1764

Re: At a loss here... Pressurizing my cannon

Ah yes i'm sorry i forgot to add; The valve is not a homemade piston valve but an actual industrial piston valve. The surface area of the pilot piston is less then that of the piston that seals the chamber. So the pilot pressure needs to be higher then the camber by a few bars. So the pilot cannot b...
by Alex345
Sun Jan 17, 2016 7:04 am
Forum: Pneumatic Cannons
Topic: At a loss here... Pressurizing my cannon
Replies: 11
Views: 1764

At a loss here... Pressurizing my cannon

Here's my problem; I'm building a +-25 bar cannon with a rather large chamber and small pilot volume, so using any type of manual pump would have a chance of the pilot losing it's pressure by the time i'm done filling the main chamber. I had a fridge compressor, but all the oil ran out during it's r...
by Alex345
Thu Dec 17, 2015 3:31 pm
Forum: Ammo & Parts
Topic: Fin stabilized and/or sub-caliber ammo?
Replies: 8
Views: 2341

Re: Fin stabilized and/or sub-caliber ammo?

Do you have specific numbers? God, i still need to find a decent way to pressurize the cannon to around 435-500 psi, completely forgot about that too... I think the valve can handle quite a bit of pressure but i wanna take it slow :) I have nothing in mind numbers wise, i just wanna make a decent p...