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| PVC Arsenal 17 |
 Posted: 04/27/2007 14:46 PM Post subject: |
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WITTY PHRASE
Joined: 27 Mar 2006
Posts: 1202
686.44 Spud Bux
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| I wonder if you could have used just a bb as a piston. It would probably be lighter and should work just as well. |
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| iknowmy3tables |
| Posted: 04/27/2007 15:43 PM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1100
2582.70 Spud Bux
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DAMMIT I had this exact Idea, even the part about using the schrader to actuate, do you realize how annoying it is to have you idea taken to be used against you is a competion while his thread has multiple pages while mine only has 5 replies and has been out for longer 
i have briefly mentioned it before,
| iknowmy3tables wrote: | | 100ft, mini, thats pretty good, I bet you could make a coaxle, and using a rubber schrader as an refill, actuator, even a bumper for pistons |
http://www.spudfiles.com/forums/a-mini-pneumatic-t5930,start,15.html
and I even have a prototype in the shop for the schrader concept
yeah it a piece of crap because I don't have access to a hardware store execpt this crappy local one that doesn't even have brushings (which is why deus ex machina is all streamlined exept for the large chamber which is scrap), I've had it forever, but I couldn't find a new diaphragm, the last one was made from tire patches but it it got sucked in the barrel somewhere past 40psi I still haven't found a working diaphram |
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| Hotwired |
| Posted: 04/27/2007 16:14 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1551
3182.12 Spud Bux
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Tsk tsk... gotta move fast after showing your ideas otherwise someone else will reinvent them and you'll lose the credit  |
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| clide |
| Posted: 04/27/2007 17:36 PM Post subject: |
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Donating Member
Joined: 06 Mar 2005
Posts: 655
1889.96 Spud Bux
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Making a small coaxial triggered by a schrader is nothing new, thats what pretty much all of jack's minis are, and I've even seen it on guns before jack's.
This gun is impressive just because it is so darn small. |
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| origin unknown |
| Posted: 04/27/2007 19:43 PM Post subject: |
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Colonel
Joined: 14 Apr 2007
Posts: 529
890.28 Spud Bux
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| This gun would be a great way for self defence for like an old person or a woman. They could just carry it in their pocket or purse, just in case a criminal happens to attack. It probably wouldn't severely wound the attacker, but it would give them good wakeup call not to come any closer. A stun gun would be more reliable and safe though. |
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| jackssmirkingrevenge |
| Posted: 04/27/2007 21:04 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6145
9107.36 Spud Bux
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| Quote: | I wonder if you could have used just a bb as a piston. It would probably be lighter and should work just as well.
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I considered this option, but since once the parts are epoxied in place, they're fixed for good and I can't access the internals, I though i'd better play it safe and use a conventional piston.
| Quote: | | DAMMIT I had this exact Idea, even the part about using the schrader to actuate, do you realize how annoying it is to have you idea taken to be used against you is a competion while his thread has multiple pages while mine only has 5 replies and has been out for longer Evil or Very Mad |
No need to bunch up your undies, I've been making mini-coaxials like this for years now, nothing new under the sun
| Quote: | | This gun would be a great way for self defence for like an old person or a woman. They could just carry it in their pocket or purse, just in case a criminal happens to attack. It probably wouldn't severely wound the attacker, but it would give them good wakeup call not to come any closer. A stun gun would be more reliable and safe though. |
I'd rather they carried one of these, for their sake:
Last edited by jackssmirkingrevenge on 04/29/2007 0:27 AM; edited 1 time in total |
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| thrasmussen |
| Posted: 04/28/2007 7:58 AM Post subject: |
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Corporal
Joined: 13 Sep 2006
Posts: 75
126.05 Spud Bux
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| Is your shrader valve modified or does it come that way. Without wrench lugs. |
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| jackssmirkingrevenge |
| Posted: 04/28/2007 8:21 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6145
9107.36 Spud Bux
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The schrader is taken from a bicycle inner tube. I first strip off the rubber to reveal the brass body, this is what it looks like half way through:
Then, depending on the project requirements - as short as possible in this case - I cut it down with a hacksaw. There is a minimum length of course, you have to leave at least the equivalvent length of the threaded portion otherwise you'll cut through the internal mechanism. |
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| Los Frijoles |
| Posted: 04/28/2007 10:04 AM Post subject: |
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Private First Class
Joined: 12 Dec 2005
Posts: 36
92.16 Spud Bux
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This gun is so insanely cool  . I am now seriously inspired to make something like this... |
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| jackssmirkingrevenge |
| Posted: 04/28/2007 15:05 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6145
9107.36 Spud Bux
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Thanks  It's really not that hard, you just have to be a little patient with working with messy epoxy and small components.
I added some marine epoxy reinforcement to the leaky area, so expect some 400 psi+ tests some time tomorrow afternoon  |
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| Hotwired |
| Posted: 04/28/2007 15:13 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1551
3182.12 Spud Bux
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Is the barrel wide enough to allow a cheap non-sprung ball point pen cartridge in? They're a couple of mm in diameter including the brass ball nib.
I've used them before on a 3.5mm bore barrel with the end split and flared to fill out the bore and they make lethal darts.
Fire them fast enough and the plastic tube of ink behind the brass nib splinters into inky shards from the impact... after burying the nib up to an inch into green wood or softwood.
In this case I think they could be perfect, particularly as it's disguised as a pen. |
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| jackssmirkingrevenge |
| Posted: 04/28/2007 15:26 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6145
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brilliant idea, sadly only the nib fits  I tried shooting a headless nail at a CD clamped in a vice and it blew it in half, so I think some further investigation of more substantial projectiles is in order. Not just yet though, got an FT competition tomorrow morning so I'm dedicating my time to my beloved Daystate for now |
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| thrasmussen |
| Posted: 04/28/2007 15:35 PM Post subject: |
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Corporal
Joined: 13 Sep 2006
Posts: 75
126.05 Spud Bux
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| Now you said machining. What machining? |
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| jackssmirkingrevenge |
| Posted: 04/28/2007 15:42 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6145
9107.36 Spud Bux
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| thrasmussen wrote: | | Now you said machining. What machining? |
I did? No machining involved whatsoever, simpling cutting tubes to size. I used my improvised lathe simply to be able to clean up the ends of the tubes with a file and sandpaper. |
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| thrasmussen |
| Posted: 04/28/2007 17:21 PM Post subject: |
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Corporal
Joined: 13 Sep 2006
Posts: 75
126.05 Spud Bux
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| That's good. I don't like to much machining |
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