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| clide |
 Posted: 04/26/2007 17:47 PM Post subject: |
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Donating Member
Joined: 06 Mar 2005
Posts: 665
1918.85 Spud Bux
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Well, I guess that brings our debate over small launchers to a new level. Well played jack, well played. 
I've been toying with the idea of making a pen sized minipump, but now that there is already a pen gun I'll have to complete my other mini idea before I can get around to a pen gun.
Nice work. Hope you don't get lead poisoning from having lead pellets all over your house. |
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| Hotwired |
| Posted: 04/26/2007 18:13 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1592
3281.73 Spud Bux
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| jackssmirkingrevenge wrote: | | Quote: | | Nice work, looks good. Have you considered using a presta valve instead of a schrader? You don't need a pin to depress a presta stem. |
Thanks  very logical suggestion... though can a presta handle the sort of pressures I'm likely to subject it to? |
I'm using a presta in mine at 240psi and I'm likely to be using it at 300psi too when I get hold of the right kind of pump.
What are you using to get 400psi? |
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| Velocity |
| Posted: 04/26/2007 19:07 PM Post subject: |
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Brigadier General
Joined: 07 Feb 2006
Posts: 949
25.24 Spud Bux
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Wow... this is truly a tiny cannon!
I build a cannon which fit inside of a pen tube once... but it was just a .177 tube that I blew into to fire spitballs ... nonetheless, it was accurate and looked EXACTLY like a regular pen (the internals of the pen were the ramrod!), and my english class never knew what hit them (well I guess they did after a while...)
I can't BELIEVE you were able to fiddle around with such small parts! I get annoyed having to fix my 1" porting piston valves  |
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| iPaintball |
| Posted: 04/26/2007 19:16 PM Post subject: |
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Colonel
Joined: 04 Mar 2007
Posts: 701
942.58 Spud Bux
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That is truly a feat of microengineering!  This thing must be so much fun to play with. I wish I could build a mini this small! Keep it up man... |
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| _Fnord |
| Posted: 04/26/2007 19:44 PM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1174
1636.63 Spud Bux
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That is an incredible design.
Will it shoot through cardboard? plastic? kevlar?
The smallest gun I made was also the size of a pen, but it was a semi-auto bbg powered by a rubber band.(I think It was back around 01')
I took it on a 3-day class trip, where I shared a hotel room with three other people. There were soo many bbs in the carpet by the end of the trip, it took forever to find them all.
..But just wait till I make my next mini. It will use a single carbon nanotube with a graphite burstdisk as a chamber/barrel, along with a molecular valve to be injected with hydrogen atoms. I plan on shooting buckeyballs with it.
Ok, Im jk.
http://en.wikipedia.org/wiki/Buckeyball |
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| origin unknown |
| Posted: 04/26/2007 19:49 PM Post subject: |
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Colonel
Joined: 14 Apr 2007
Posts: 529
890.28 Spud Bux
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| I might just make one of these myself... |
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| jackssmirkingrevenge |
| Posted: 04/26/2007 23:16 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6239
9329.59 Spud Bux
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Thank you all for the feedback
| Quote: | | You've inspired me! Now I have no choice but to make one. Thanks a lot... |
The parts are available from any hobby shop, and I didn't use any complicated tools - mostly a hacksaw, sandpaper, and an electric drill clamped in a vice as an improvised lathe
| Quote: | | Hope you don't get lead poisoning from having lead pellets all over your house. |
Thats mostly a risk from handling the pellets, I always wash my hands after Besides, the impact energies aren't sufficient to give off too much dust.
| Quote: | I'm using a presta in mine at 240psi and I'm likely to be using it at 300psi too when I get hold of the right kind of pump.
What are you using to get 400psi? |
Good to know, though I think I'll stay with the schrader for this one, don't feel like hacking it up. This is the pump I have:
the 400 psi figure is assumed, gauge only reads till 300 (for spartaaa!) but I keep on pumping until the needle hits the stop (see attachment)
| Quote: | | I can't BELIEVE you were able to fiddle around with such small parts! I get annoyed having to fix my 1" porting piston valves |
Don't try making a check valve out of lighter bits then 
| Quote: | | Will it shoot through cardboard? plastic? kevlar? |
At 200 psi, it won't make it through a top of a pizza box. However, for such a small chamber, short barrel and tiny projectile, I wasn't expecting much better. Still waiting for the courage to take it to 400 psi again though hehe |
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| Insomniac |
| Posted: 04/27/2007 0:57 AM Post subject: |
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Colonel
Joined: 18 Dec 2006
Posts: 651
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Lol I think its hilarious that we are complimenting a gun that won't shoot through cardboard at 200psi
This is a truly amazing gun though, I always wanted somone to make a mini coaxial, but I never imagined anyone would be able to make one THIS small. Have you tried a barrel load of water yet???
EDIT: Wooo 500th post!!!
Last edited by Insomniac on 04/27/2007 7:55 AM; edited 1 time in total |
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| jackssmirkingrevenge |
| Posted: 04/27/2007 1:55 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6239
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| Insomniac wrote: | | Lol I think its hilarious that we are complimenting a gun that wont shoot through cardboard at 200psi |
I know, I know, I'm almost ashamed, after all I routinely hit 1,000 fps with my 6mm coaxials. Now that I have the contest entry covered though I might be tempted to test it to destruction, as far as high pressure goes this is by far the easiest chamber to pump I've ever made |
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| skinner |
| Posted: 04/27/2007 3:28 AM Post subject: |
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Corporal
Joined: 24 Dec 2006
Posts: 67
172.55 Spud Bux
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Woah!
Now THAT is skill right there.
So minute, but so amazing.
Thats a competition winner right there.
Keep up the good work.
--Skinner |
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| thrasmussen |
| Posted: 04/27/2007 6:42 AM Post subject: |
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Corporal
Joined: 13 Sep 2006
Posts: 75
126.05 Spud Bux
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| I like it, kinda has that James Bond\Q look! My only question is how is the guts held in? |
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| frankrede |
| Posted: 04/27/2007 6:51 AM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2708
210.95 Spud Bux
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That is briliant, I have been looking at this for a couple hours on and off and thinking, wow, this guy is just crazy.
Nice, job, you make something complicated and make ist so simple.
now, for me to do a less than mini coaxial, with1" chamber and .177 barrel.
Over sized barrel, but I can make pistons easily for that size. |
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| jackssmirkingrevenge |
| Posted: 04/27/2007 7:20 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6239
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| Quote: | | I like it, kinda has that James Bond\Q look! |
Not just in the movies, the KGB have a pen gun that comes complete with a silencer for covert work... Also, Georgi Markov was assasinated using a similar compressed air device hidden in an umbrella that fired a 2mm pellet laced with poison.
| Quote: | | My only question is how are the guts held in? |
Araldite, a close third after duct tape and rubber bands when it comes to keeping the world together  I normally use proper high-strength marine epoxy like this stuff in my projects but given the scale of this particular build, Araldite was enough - plus it takes much less time to cure meaning less anxious jumping around before I can test it
| Quote: | Nice, job, you make something complicated and make ist so simple.
now, for me to do a less than mini coaxial, with1" chamber and .177 barrel. |
Thanks My suggestion if building on a small scale is make an overengineered small chamber and get yourself a high pressure pump, it's the only way to get good performance with small calibers. |
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| thrasmussen |
| Posted: 04/27/2007 12:48 PM Post subject: |
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Corporal
Joined: 13 Sep 2006
Posts: 75
126.05 Spud Bux
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| You should make a cane gun like this. |
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| LGM |
| Posted: 04/27/2007 12:54 PM Post subject: |
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Captain
Joined: 22 Jan 2007
Posts: 318
195.39 Spud Bux
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Yesterday I found some tubing from an old car antenna, looks about 3mm wide.
I plan to make a lead ball mini like this one that runs off hydrogen, hope that ends well. |
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