pneumatic pen gun v2 - added video
- jackssmirkingrevenge
- Five Star General
- Posts: 26179
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 543 times
- Been thanked: 319 times
Most of you are probably aware of my pneumatic pen-gun, this is an extended version of the same concept. Chamber size is roughly double and barrel length is almost three times that of the original, so it clearly no longer fits in the "pen" category.
I've also used a different piston configuration, with the piston now being solid rubber cut from 1/4" thick sheet as shown below:
Otherwise, construction and materials are the same as the first version, have a look at the how-to here for details.
The idea is to evaluate the power potential of this small (2.5mm, roughly one tenth of an inch) calibre with a reasonably sized barrel and chamber taken to high pressures (300 psi+) and if successful, fabricate a coaxial suppressor and later a pistol grip to enable the unit to be operated in a conventional manner.
So far I've only been able to test it to 150 psi but I should have one of these beto shock pumps on the way, gauge goes up to 400 psi so expect significant performance results soon.
How it works:
edit 30/01/2010:
high speed target footage:
[youtube][/youtube]
[youtube][/youtube]
[youtube][/youtube]
[youtube][/youtube]
edit 01/03/2009. damage video:
[youtube][/youtube]
steel bolt section fired at 400 psi at a gamo tin.
Until then, some pics:
I've also used a different piston configuration, with the piston now being solid rubber cut from 1/4" thick sheet as shown below:
Otherwise, construction and materials are the same as the first version, have a look at the how-to here for details.
The idea is to evaluate the power potential of this small (2.5mm, roughly one tenth of an inch) calibre with a reasonably sized barrel and chamber taken to high pressures (300 psi+) and if successful, fabricate a coaxial suppressor and later a pistol grip to enable the unit to be operated in a conventional manner.
So far I've only been able to test it to 150 psi but I should have one of these beto shock pumps on the way, gauge goes up to 400 psi so expect significant performance results soon.
How it works:
edit 30/01/2010:
high speed target footage:
[youtube][/youtube]
[youtube][/youtube]
[youtube][/youtube]
[youtube][/youtube]
edit 01/03/2009. damage video:
[youtube][/youtube]
steel bolt section fired at 400 psi at a gamo tin.
Until then, some pics:
- Attachments
Last edited by jackssmirkingrevenge on Sat Feb 26, 2011 3:40 am, edited 3 times in total.
- jackssmirkingrevenge
- Five Star General
- Posts: 26179
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 543 times
- Been thanked: 319 times
It's been fine so far, it's cut fairly roughly so I'm hoping it will be ok. Time will tell, can't wait for that shock pump to arrive.Carlman wrote:I think the rubber piston will expand to much when high pressure is applied
Brilliant time to visit ebay.co.uk at the moment thanks to the exchange rate also bought a CO<sub>2</sub> tyre inflator, expect a machine pistol soon
- ALIHISGREAT
- Staff Sergeant 3
- Posts: 1778
- Joined: Sat Aug 25, 2007 6:47 pm
- Location: UK
thank Gordon i remember when the £ was 1:2 against the $... happy times... now its just crap against everything.jackssmirkingrevenge wrote:It's been fine so far, it's cut fairly roughly so I'm hoping it will be ok. Time will tell, can't wait for that shock pump to arrive.Carlman wrote:I think the rubber piston will expand to much when high pressure is applied
Brilliant time to visit ebay.co.uk at the moment thanks to the exchange rate also bought a CO<sub>2</sub> tyre inflator, expect a machine pistol soon
<a href="http://www.bungie.net/stats/halo3/defau ... player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
- Sticky_Tape
- Sergeant 2
- Posts: 1175
- Joined: Thu Jan 31, 2008 6:35 pm
- Location: Sydney, Nova Scotia, Canada.
Video? Nice gun how long is it in inches?
You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
- jackssmirkingrevenge
- Five Star General
- Posts: 26179
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 543 times
- Been thanked: 319 times
Videos will come when I get the shock pump as it's pointless testing damage now. Total length is 38cm, that's just under 15 inches.Sticky_Tape wrote:Video? Nice gun how long is it in inches?
- Sticky_Tape
- Sergeant 2
- Posts: 1175
- Joined: Thu Jan 31, 2008 6:35 pm
- Location: Sydney, Nova Scotia, Canada.
It's not pointless it can still do somthing.
You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
- ALIHISGREAT
- Staff Sergeant 3
- Posts: 1778
- Joined: Sat Aug 25, 2007 6:47 pm
- Location: UK
yeah but it will be crap at 150psi.
<a href="http://www.bungie.net/stats/halo3/defau ... player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
- Sticky_Tape
- Sergeant 2
- Posts: 1175
- Joined: Thu Jan 31, 2008 6:35 pm
- Location: Sydney, Nova Scotia, Canada.
Ok well I'm sure it will be fun with high pressure.
You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
- jackssmirkingrevenge
- Five Star General
- Posts: 26179
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 543 times
- Been thanked: 319 times
Got my new pump (modded for comfort as seen is the attached picture) and at 400 psi it's a blast!
[youtube][/youtube]
That's a small section of bolt as ammunition at 400 psi straight through a gamo tin (and the polystyrene backing). It's pretty loud too so a detachable suppressor is on the cards.
Did I mention how much I like this pump
[youtube][/youtube]
That's a small section of bolt as ammunition at 400 psi straight through a gamo tin (and the polystyrene backing). It's pretty loud too so a detachable suppressor is on the cards.
Did I mention how much I like this pump
- Attachments
-
- pgv2pump.JPG (28.55 KiB) Viewed 6437 times
- ALIHISGREAT
- Staff Sergeant 3
- Posts: 1778
- Joined: Sat Aug 25, 2007 6:47 pm
- Location: UK
nice to see the piston doesn't compress and expand and that shock pump is pretty tasty... maybe i should mod mine too, its got this terrible tiny handle that would be too small for a 5 year old
<a href="http://www.bungie.net/stats/halo3/defau ... player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
Looks nice and promising. Now ill prob get the some 1/4 inch rubber so i can finish my pen gun.
By the way, didnt that leave a hole in your wall?
By the way, didnt that leave a hole in your wall?
4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
- jackssmirkingrevenge
- Five Star General
- Posts: 26179
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 543 times
- Been thanked: 319 times
I have to say this piston really is the mutt's nuts, childishly simple to make , so problem with attaching a separate seal, durable and works great at high pressure, unlike the original pengun that leaked above 200 psi and never had its true potential realised.LikimysCrotchus5 wrote:Now ill prob get the some 1/4 inch rubber so i can finish my pen gun.
What's another holeBy the way, didnt that leave a hole in your wall?
- Gippeto
- First Sergeant 3
- Posts: 2503
- Joined: Sat Jan 19, 2008 10:14 am
- Location: Soon to be socialist shit hole.
- Has thanked: 2 times
- Been thanked: 17 times
Very nice Jack. It's "sleek" looking.
Does your new shock pump open the schrader valve too? Looks as though it might.
Cracking pressure be damned.
Does your new shock pump open the schrader valve too? Looks as though it might.
Cracking pressure be damned.
Ahh to be single.What's another hole
"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.
Liberalism is a mental disorder, reality is it's cure.
- jackssmirkingrevenge
- Five Star General
- Posts: 26179
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 543 times
- Been thanked: 319 times
Yep, that purple anodised bit is a separate threaded bit that presses the stem independently.Gippeto wrote:Does your new shock pump open the schrader valve too? Looks as though it might.
Cracking pressure be damned.
Actually I modded the shcrader somewhat, if you can call it that. Basically clipped off the the bulged bit that stops the stem from coming out and stretched it a bit, seems to have weakened the spring to the point that there's practically no resistance.
I'm not, but she's given up on meAhh to be single.