Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 55 users online :: 5 registered, 0 hidden and 50 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], MCRKilljoy, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Piston Handgun Design

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.
Sponsored 
  • Author
    Message

Piston Handgun Design

Unread postAuthor: shadowzzz » Fri Apr 10, 2009 5:42 am

Hello,

I am planning on making my first piston gun, and decided that it will be a handgun.

This is the design thus far:

Image

The barrel is 15mm OD and the chamber parts are 22mm OD.
I will make a detachable bb-barrel for it, if I can find one...

Well, do you see any design flaws or can you think of some improvements ?
Will the vertical chamber part do any good ? I thought it would come in handy because it doubles as grip.

Please tell me what you think of it !
  • 0


shadowzzz
Private
Private
 
Posts: 16
Joined: Thu Mar 05, 2009 1:07 pm
Reputation: 0

Unread postAuthor: Carlman » Fri Apr 10, 2009 6:05 am

yea mate should be sweet, i had a coax 15mmx20mm and it worked fine, yours is the same just with a bit extra chamber because of the T.

You wont need the spring unless you fill via chamber though.
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: shadowzzz » Fri Apr 10, 2009 6:11 am

Oh, but I am filling via the chamber, via the little vertical piece.
I read somewhere on this marvelous site that that's alot faster than waiting for air to leak and equalize from the pilot space to the chamber ?

Is it very difficult to fill via the chamber?
  • 0


shadowzzz
Private
Private
 
Posts: 16
Joined: Thu Mar 05, 2009 1:07 pm
Reputation: 0

Unread postAuthor: sniper hero » Fri Apr 10, 2009 6:17 am

filling via pilot side doesn't take longer in this design maybe 1sec and because of the spring you lose a little power and it might be the case it takes some time before it seals.

I would go for a blowgun with a male cuick connect screwed in it
and yes you have to hold the blowgun while filling.
ps: no spring needed then
  • 0

proud member of dutch spud clan
coming: semi auto pellet sniper:D
User avatar
sniper hero
Captain
Captain
 
Posts: 332
Joined: Fri Mar 07, 2008 3:12 pm
Reputation: 0

Unread postAuthor: john bunsenburner » Fri Apr 10, 2009 7:09 am

Hmm, the design is simple, and should work(if you leave the spring out and fill via pilot side it will work great) but the blow gun is in a really wierd position in tems of looks...

If you are going more for power than looks this is great, if not then try this(its new, its random, but hey, what else woudl you expect from me). I think the diagram makes sense on its own(that is if you manage to read my writing) if not, feel free to ask.
  • 0

Attachments
proper-hand-gun.jpg
I think the diagram makes sense on its own(that is if you manage to read my writing) if not, feel free to ask.
"Did you ever stop to think that out of the seven deadly sins envy is the only one which doesn't give the sinner even momentary pleasure"-George Will
User avatar
john bunsenburner
Major General
Major General
 
Posts: 1446
Joined: Sun Oct 19, 2008 5:13 am
Reputation: 0

Unread postAuthor: MRR » Fri Apr 10, 2009 8:09 am

Consider to pressurize from the pilot volume (with a small chamber like in a pistol it wouldn't make any difference).

Coaxial are bad designs to go semi / auto so there wouldn't be an advantage either.
  • 0


MRR
Major
Major
 
Posts: 362
Joined: Tue Feb 17, 2009 2:29 pm
Reputation: 0

Unread postAuthor: MRR » Fri Apr 10, 2009 9:20 am

After writing the comment on this post I ate something, drank a coffee and then I build a coax with spare parts laying around.
All in about one hour :lol: .

Well I already had a piston and I didn't make a barrel support but it works like a charm.
Not bad for a first try on a coax I think.

Length: 99cm (including blow gun)
Chamber: 1", 40 cm long
Barrel: 15mm, 78cm long

Image

This is no pistol but a really easy build that you could adapt in a smaller scale.
  • 0


MRR
Major
Major
 
Posts: 362
Joined: Tue Feb 17, 2009 2:29 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: shadowzzz » Fri Apr 10, 2009 10:51 am

Wow, nice build there! It's very similar to what I was thinking of, but I think I'll make mine shorter.

You are not filling from the pilot side are you ? Do you have a spring or something ?

by the way: is it possible to hook up a schrader ( or smaller bike valve ) and a blowgun to the same endcap ? if not, I think I'll decide not to fill from the pilot side, al that tinkering with male quick connects...
I think I can't find those here in Holland..

If I understand correctly: A quick connect is used so you can also fill via the blowgun, right ? If not, what is it for ? :P

Again, cool gun MRR ! :D

Edit: Why do you have a ballvalve between your chamber and your schrader ? Anti-leakage or something ?
  • 0


shadowzzz
Private
Private
 
Posts: 16
Joined: Thu Mar 05, 2009 1:07 pm
Reputation: 0

Unread postAuthor: twizi » Fri Apr 10, 2009 11:00 am

why not do somethin like the high presure pistol idea go to search and type it in
it looks like it works well try this idea it also the simpilest idea
  • 0

User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: Gippeto » Fri Apr 10, 2009 11:06 am

by the way: is it possible to hook up a schrader ( or smaller bike valve ) and a blowgun to the same endcap ?


Use a tee, like in the picture below. :)
  • 0

Attachments
Exploded_view.jpg
"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
Gippeto
Donating Member
Donating Member
 
Posts: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: Carlman » Fri Apr 10, 2009 11:35 am

Search for TG6 on spudfiles. Its a qev gun I made where the pilot/fill was a 1/4" ball valve and a de cored scrader in the end of it. I opened the BV filled through scrader closed BV then unhooked air hose then used BV as pilot valve.

I would have linked you but I am posting from my phone.

It worked flawlessly as a pilot setup.
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: LCTChamp » Fri Apr 10, 2009 11:42 am

If I understand correctly: A quick connect is used so you can also fill via the blowgun, right ? If not, what is it for ? Razz


No. A quick connect is just another way to fill up the gun. Most compressors have a female quick connect on them already, so they use these to fill instead of using a shcrader valve.

Edit: Why do you have a ballvalve between your chamber and your schrader ? Anti-leakage or something?


There isn't a schrader valve there. It is a quick disconnect. Shrader valve's have a built it valve to stop air from coming back out. There is no valve inside of a quick disconnect that prevents air from coming out. So he added a ball valve.
  • 0

User avatar
LCTChamp
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Thu Aug 21, 2008 8:01 am
Reputation: 0

Unread postAuthor: shadowzzz » Fri Apr 10, 2009 12:11 pm

Oh okay, thanks for the major clarifictations, all!

Oh and Gipetto, I thought of that too but I thought the increased pilot volume might be a very bad thing for a small gun, like my design-thingy.
But if it doesn't matter alot, I'll do what you suggested!

Thanks all, sorry to bother you all.
  • 0


shadowzzz
Private
Private
 
Posts: 16
Joined: Thu Mar 05, 2009 1:07 pm
Reputation: 0

Unread postAuthor: SubsonicSpud » Sat Apr 11, 2009 9:51 pm

If you want to make it more pistol like, I would ditch the tee section and keep it as a simple coax. The blow valve can be attach to the back via a 45 or 90 degree elbow, and a grip can formed around the blow valve. This will give you a pistol style L shape that can be shot single handed.
  • 0

User avatar
SubsonicSpud
2nd Lieutenant
2nd Lieutenant
 
Posts: 202
Joined: Sat Jan 03, 2009 8:55 am
Location: Australia
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], MCRKilljoy, Yahoo [Bot]

Reputation System ©'