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A short question

Discuss miniature cannons built from things such as pill bottles and pen caps.
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A short question

Unread postAuthor: Packols » Mon Mar 12, 2012 9:10 am

is it ok to use a co2 bike refile with a mini pen gun if so will it be more powerful
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Unread postAuthor: jrrdw » Mon Mar 12, 2012 9:21 am

Wear thick leather gloves, eye protection and fill a little at a time. This is where part of the fun comes from...
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Re: A short question

Unread postAuthor: Crna Legija » Tue Mar 13, 2012 1:07 am

Packols wrote:is it ok to use a co2 bike refile with a mini pen gun if so will it be more powerful


if you think it can withstand 800+ psi then yeah sure.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 13, 2012 1:17 am

I once tried filling this with one of these, it gave me at least 50 good fills before I gave up counting :)
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Unread postAuthor: MrCrowley » Tue Mar 13, 2012 3:14 am

jackssmirkingrevenge wrote:I once tried filling this with one of these, it gave me at least 50 good fills before I gave up counting :)

Hmm... would you trust my Maglite Mini at those pressures? I would be tempted to buy one if it could handle it :D
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 13, 2012 3:21 am

MrCrowley wrote:Hmm... would you trust my Maglite Mini at those pressures? I would be tempted to buy one if it could handle it :D


No, because you made it ;)

... in the sense that you're the one who knows how well you put it together.

This thing had masking tape and Araldite endcaps, with a thin walled (less than 1mm) brass chamber, and it took 800 psi no problem.
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Unread postAuthor: MrCrowley » Tue Mar 13, 2012 3:24 am

Haha fair enough. I wish I had a way to regulate the pressure down to 400PSI so I wouldn't use up a cartridge so fast. Is there anyway it would be possible to 'time' a 400PSI fill by quickly releasing the cartridge valve and then closing it?

$15 but doesn't look as good as your one.

This one has 'precise inflation control'
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 13, 2012 5:08 am

Sourced Directly from a natural carbon dioxide spring


Makes you want to drink it :)

Here's a thought, get the $15 one.

tee:

http://www.ebay.com/itm/2PCS-3-Ways-1-4 ... 336f98b0cb

gauge:

http://www.ebay.com/itm/New-1500-PSI-Pa ... 2a19352e54

female schrader cap:

http://www.ebay.com/itm/New-Bullet-Car- ... 20ba63457c

All the above together with a schrader valve body and a suitably sized o-ring, put into a blender with some epoxy... voila, no more guesswork ;)
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Unread postAuthor: MrCrowley » Tue Mar 13, 2012 5:17 am

Perhaps I have already spent my brain's daily allowance of thought processing time as I lost you at the female schrader cap part :D

I follow you with the tee and gauge but my mind draws a blank after that and refuses to work any further!
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 13, 2012 5:34 am

The tee has three ends:

end 1, screw the gauge (in the tangent part - straight fit) by the way that should be a 1/8" tee to fit it.

end 2, epoxy in a schrader body (schrader with the stem removed) - this part then screws into the CO<sub>2</sub> inflator.

end 3, epoxy in the female schrader cap. This needs a hole drilled through the top, and a rubber seal placed inside. This is where you screw in your launcher valve.
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Unread postAuthor: MrCrowley » Tue Mar 13, 2012 5:47 am

Ah yup, I getcha. That, in conjunction with one like yours would probably be the best solution. Does the trigger release a small puff of gas when depressed, like is it very controllable?

My thinking is this:
Buy a trigger operated CO2 inflater
Briefly depress the inflater in to a balloon
Measure dimensions of balloon to get a rough idea of volume
Figure out how much CO2 was expelled to fill the balloon
Measure volume of Maglite Mini
Figure out at what pressure that volume of CO2 would be inside the Maglite Mini

Wouldn't be surprised if this thinking if flawed; please do criticise :)
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 13, 2012 6:21 am

My major objection would be the temperature sensitivity of carbon dioxide.

I have a simpler idea, buy the inflater and find yourself a large sheet of 1/4" plywood. Drill a 10mm hole in the centre of the plywood, poke the maglite mini schrader through it then screw on the inflater.

Stand behind the sheet wearing safety glasses and earplugs, then pull the inflater trigger :D
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Unread postAuthor: pneumaticcannons » Tue Mar 13, 2012 7:58 am

Sounds like a plan. I'll have to try it with my newly finished marker gun... :D

In all seriousness, do you think this thing would hold 800 psi even though it's thin walled copper? .66mm to be precise. I'm thinking no chance but the 3 inch long , 8mm barrel gives some pretty sad results to be honest @ 300 psi. Plus the the portability sounds pretty appealing especially after my crap zefal shocky broke :roll:
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 13, 2012 9:06 am

The thing with copper is that it's very soft, so under pressure it will stretch and pull away from the epoxy.

This project was fine at 500 psi but leaked at 800, on the other hand it was much larger diameter.
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Unread postAuthor: Brian the brain » Tue Mar 13, 2012 1:15 pm

Fill it up completely with water and find out.

If it pops it will pop with less energy.
Hiding behind a sheet is still a good idea.

And so it wearing earprotection while doing so.

I have had 80 bar on a piece of 15mm copper pipe.

No...79.9
but it wasn't the pipe that blew or broke my upper jaw either.
Little checkvalve problem.

Just be careful.
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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