barrel sealing piston gun. Gen. 2, sniper variant

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
jave101
Private 2
Private 2
Posts: 33
Joined: Sat Mar 11, 2006 10:17 pm

Fri Feb 02, 2007 12:24 am

this is the sniper version of my latest gun. the old version is here: http://www.spudfiles.com/forums/viewtopic.php?t=5366&

a little bit of cutting and soldering and i came up with this. much easier to aim and shoot, i'll have to do some chrony testing and that but the old version was getting pretty high.
Attachments
DSCF3377.JPG
whole gun
whole gun
User avatar
A-98
Corporal 5
Corporal 5
Posts: 921
Joined: Thu Apr 27, 2006 7:41 pm
Location: Santa Barbara, CA

Fri Feb 02, 2007 12:39 am

cool gun!

nice chamber, whats it made out of?
im guessing you used a barrel sealing valve?
There are rules, and then there are hundred dollar bills.
User avatar
noname
First Sergeant 4
First Sergeant 4
Posts: 2698
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA

Fri Feb 02, 2007 12:47 am

Very well made. That's a first, a "backwards" barrel sealer. Good thinking.
User avatar
MrCrowley
Moderator
Moderator
Posts: 10078
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Been thanked: 3 times

Fri Feb 02, 2007 3:12 am

WOW! :shock: That look 100% better then your old style gun. Love the backwards barrel sealer as well.
User avatar
experament-u2
Specialist 4
Specialist 4
Posts: 469
Joined: Tue Dec 26, 2006 11:18 pm

Fri Feb 02, 2007 3:18 am

mark this day when the first backwards barrel sealer was made

sweet gun oh and is that a soda water refile thing you used for the chamber if it is did you just thread it in or use another method
User avatar
jave101
Private 2
Private 2
Posts: 33
Joined: Sat Mar 11, 2006 10:17 pm

Fri Feb 02, 2007 3:32 am

the first backwards barrel sealer you reckon, im all happy now lol.
yeah that is a soda water refill CO2 bottle. its threaded on to it, just uses normal 20mm metric thread. all you gotta do it depressurize it and unscrew the valve in it.

also that blowgun is highly modified lol, gets about 3-4 times the flow of a regular one. abit fiddly to do but so much better than a ball valve. less wobble when you open it, i was going for accuracy with this gun.
i've even made a special mold for casting bullets made out of epoxy resin which works quite well.

i also attached a red dot laser onto it which inproves accuracy alot.
kris
Private 3
Private 3
Posts: 45
Joined: Sat Jun 24, 2006 4:44 pm

Fri Feb 02, 2007 9:40 am

that cannon is freakin sweet nice job
User avatar
Hotwired
First Sergeant 3
First Sergeant 3
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK

Fri Feb 02, 2007 10:20 am

+1 for a neat and functional design
+2 for being a copper cannon :wink:

Are you muzzle loading it?
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

Fri Feb 02, 2007 10:21 am

OOOHHH. I Like that alot! How much PSI can that thing take? Im making a Marble sniper rifle, and im trying to make it as realistic as possible. I think i might use your design there it has the "look" like I could make a nice PVC sheath around it. Plus, the backwards Barrel sealer........ Nice!
Hawkeye
Specialist 4
Specialist 4
Posts: 462
Joined: Sun Jan 21, 2007 7:12 pm

Fri Feb 02, 2007 10:24 am

The amount of dead space likely isn't doing you any favors but the shape is nice. You should try to find a cap that fits the end of the chamber and screw a piece of wood to it that makes a shoulder rest.
User avatar
Hotwired
First Sergeant 3
First Sergeant 3
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK

Fri Feb 02, 2007 10:40 am

o.0

Theres always someone that bangs on about dead space when its hardly anything.

Thats 2 x 90* elbows of unavoidable space, hardly excessive and I think the appearance makes up for any of that.

I've got an entire 90* elbow of nothingness in mine and anyone declaring that to be excessive dead space had better have a much better design of their own.
Hawkeye
Specialist 4
Specialist 4
Posts: 462
Joined: Sun Jan 21, 2007 7:12 pm

Sat Feb 03, 2007 1:43 pm

You mean like one where the projectile is actually resting against the piston valve? :) People also rattle on about fps and what the chart says their design should do so why not point out the weak spots and try to eliminate them? There is also the matter of the zig-zag path the air flow goes through...
User avatar
PneuJose
Private 4
Private 4
Posts: 96
Joined: Mon Dec 11, 2006 7:13 pm

Sat Feb 03, 2007 2:46 pm

nice cannon, im working on mine right now,

can u show me ur piston?
any equalization holes in it?
User avatar
Recruit
Specialist 4
Specialist 4
Posts: 413
Joined: Fri Oct 06, 2006 4:26 pm

Sat Feb 03, 2007 3:36 pm

Nice going looks way better now.
Possible Modification for the future= With a bit of work you could make it brench loader so you could fire a bit faster
User avatar
jrrdw
Moderator
Moderator
United States of America
Posts: 6571
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Has thanked: 39 times
Been thanked: 22 times
Contact:

Donating Members

Sat Feb 03, 2007 4:57 pm

Nicely built, you can access internal parts if need be, good design! I was also wondering about the pressure rating of your chamber? Also what make of soda dispenser? Are they readily available to the public? Or is it a behind the counter/bar type of item?
Post Reply