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Help with mini valve gun

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Is this too hard of a build for me?

Poll ended at Sat Jan 14, 2012 2:30 pm

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Total votes : 1
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Unread postAuthor: Gun Freak » Wed Jan 11, 2012 8:13 pm

4/16id

1/4" :wink:

So the barrel is probably 9/32 OD, leaving a 1/64" gap on each side :lol:

Something sounds wrong :D
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Unread postAuthor: Proxywars » Wed Jan 11, 2012 10:51 pm

Body is 2/8OD Barrel is 3/16od
Stupid lowes
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Unread postAuthor: Gun Freak » Wed Jan 11, 2012 10:59 pm

2/8OD

1/4" :wink:

That still leaves you with less than 1/32" on each side :lol:
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Unread postAuthor: Proxywars » Wed Jan 11, 2012 11:29 pm

:? I will make it work. How can I make a piston easily? The hot glue is strong but it's hard to make.
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Unread postAuthor: Proxywars » Thu Jan 12, 2012 12:10 am

NVM found a thick mousepad type stuff on it look swell so i LL USE it
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Unread postAuthor: Proxywars » Thu Jan 12, 2012 12:37 am

Image

Image

How should I epoxy the barrel??
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 12, 2012 1:20 am

There isn't a whole lot of space between barrel and chamber, so for good performance you will need to take it to high pressures, 400 psi plus. I hope you can budget for a shock pump :)

Make sure you file and sand the end of the barrel where the piston seals to a fine finish and as close to a 90º angle to the length of the barrel as you can, otherwise the piston won't seal.

In order to keep the barrel centred when you glue it, this is a good technique:

Image

Find a drill bit that is the same diameter as your barrel ID, and wrap the flat part of it with masking tape until the tape diameter is as thick as your chamber ID. Use this as a jig to keep the barrel centred as in the diagram until the epoxy cures.
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Unread postAuthor: Proxywars » Thu Jan 12, 2012 9:06 am

Ya I did that exactly as shown and I let it cure for eight hours I just need to fire it now.
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Unread postAuthor: Proxywars » Thu Jan 12, 2012 9:58 am

Piston is made from soft foam it doesnt work =/
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Unread postAuthor: Proxywars » Thu Jan 12, 2012 7:13 pm

Well im using an air compressor and it doesnt work well and idk how to up the pressure but well I fill my gun than try to fire it their is uncompressed air coming out the valve like i blew it with my mouth instead. Might try to find a bike pump btw I realy dont know how much pressure is going in as their is no psi meter on my compressor
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 13, 2012 1:01 am

Being so small in terms of chamber size and calibre, these designs really need high pressure to have any significant power.

http://www.amazon.com/Neoprene-Sheet-Du ... B000MAKZYY

Not so expensive, I'm sure you will find something similar at your local hardware store for a better piston.

How about this, ready cut :D http://www.amazon.com/100-pcs-RUBBER-Co ... 428&sr=8-6
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Unread postAuthor: Proxywars » Fri Jan 13, 2012 5:47 pm

Okay I just tested for any leaks in my gun and their is none!!!! My industrial air compressor can change powers. No air is going in my gun do to the low power setting. I'll get my dad to fix that. After my dad fixes the air compressor I will try to find more leaks underwater than grease the piston and fire it hopefully. :D
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Unread postAuthor: Proxywars » Sat Jan 14, 2012 3:27 pm

Please delete my gun will not work.
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