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My First Pressure gun ever. Over/Under Design, need help.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Yukondano2 » Sun Oct 31, 2010 8:11 pm

Gun Freak wrote:Don't use a hose, put the pilot right into it. Hose is more money and less performance. More air for the pilot valve to exhaust, slower valve.

...
I wasn't going to use a pilot valve. I was planning on using a blowgun because of the trigger so i can just pull a trigger then it will fire. Its hard to aim well when I use a ball valve.
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Unread postAuthor: Gun Freak » Sun Oct 31, 2010 8:15 pm

Then in your case the blowgun would be the pilot valve.
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Unread postAuthor: Yukondano2 » Wed Nov 03, 2010 3:26 pm

I've been searching and i can't find this information. How do i install a Schrader valve? I prefer not to just buy a bike tire and cut the valve out of the inner tube. Any advice on how to do it right?

-EDIT-
Found a blowgun, would this one work?
http://www.homedepot.ca/webapp/wcs/stor ... PartNumber

-EDIT2-
Just found out that was the CANADIAN home depot site...
lawl...
shouldn't matter, they should have it.
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Unread postAuthor: Gun Freak » Wed Nov 03, 2010 3:49 pm

Buy a threaded schrader valve and use proper fittings and bushings to install it or tap threads for it.
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Unread postAuthor: Yukondano2 » Wed Nov 03, 2010 8:49 pm

Gun Freak wrote:Buy a threaded schrader valve and use proper fittings and bushings to install it or tap threads for it.


Since i don't have a tapper nor am i about to drill it into my pipe, i think i might get fittings. Thanks.

-Edit- Woot private first class :D
Thanks again
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Unread postAuthor: Technician1002 » Thu Nov 04, 2010 12:01 am

Another option is to use a tubless tire valve stem. you simply drill a hole in the pipe the right size and pull it into the hole from the inside with a little sealant. My Mouse Musket used one.

You can see it down by my right hand in this photo. Make the hole slightly small so it is a tight fit. This just requires a hole in the pipe and no threading. I found when it is installed with Window Seal for car windows, it is leak proof and will not push through when using an air chuck on it. They are not expensive at an auto parts store. I like to use the short ones.
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Unread postAuthor: Gun Freak » Thu Nov 04, 2010 4:25 pm

You don't neccesarily need a tap to thread it in, you can drill a 1/2" hole and use a bunch of teflon, or just buy some bushings to get it down. Clamp in schraders are also an option. These things should all be availble at a auto supply store.
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Unread postAuthor: Yukondano2 » Tue Nov 09, 2010 11:27 pm

I already bought a part, i'm just going to Downsize from half inch with a bit of galvanized Pipe and then down to the Schrader.
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Unread postAuthor: Yukondano2 » Sat Nov 20, 2010 1:01 pm

-Snip-
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Last edited by Yukondano2 on Sat Nov 20, 2010 2:38 pm, edited 1 time in total.
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Unread postAuthor: Yukondano2 » Sat Nov 20, 2010 1:11 pm

Like in this video?
http://www.metacafe.com/watch/762284/ho ... _powerful/

If not could you clarify what valve your using. I can just BARELY see it in the picture.

-EDIT-
Know what, the heck with this. I'm gonna buy a pipe threader. I might even have one, I'm not sure. All of this stuff is WAY too complicated and is going to cost me MORE than 10 dollars, which i can buy the tapper with. I'm going to search for one and if I don't have one, I'm off to True Value.

Goody, more questions. Do i use an epoxy to seal the valve to the hole, or just cover it in teflon.

-EDIT2-
Found out how expensive the tap is. I'm just going to use a galvanized hex bushing like i originally planned. Its around 3 dollars, whereas the bit is 10.99. Also i got a mountain dew. 8)

I'm going to seal the valve and hex bushing with some Teflon i got lying around. I'm getting the cement out in a minute, then I think I'm gonna start piecing this together. I'll dry fit it and give you guys a photo before then.

-EDIT3-

Ok, i now have pictures. Can someone tell me if i did anything wrong or how i should put this together, and all that.

http://filesmelt.com/dl/DSCN2270.JPG
http://filesmelt.com/dl/DSCN2271.JPG

I'm going to Duct tape the barrel down to the chamber while I'm cementing it.
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Unread postAuthor: mlz3000 » Sat Nov 20, 2010 7:16 pm

Looks good.

If you haven't cemented it yet, I would suggest building it thus that the valve is adjacent to the barrel (rather than behind that pair of elbow joints). If it's already glued though, no biggie.

I didn't see it mentioned yet, and as this is your first pneumatic, I figured I should make sure that you know to use primer when cementing the gun together.

EDIT: I read the thread more carefully, and noticed that you did mention using primer. Sorry about that :D
Better someone mention it without needing to than not saying anything when they needed to :wink:
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Unread postAuthor: Yukondano2 » Sat Nov 20, 2010 8:29 pm

mlz3000 wrote:Looks good.

If you haven't cemented it yet, I would suggest building it thus that the valve is adjacent to the barrel (rather than behind that pair of elbow joints). If it's already glued though, no biggie.

I didn't see it mentioned yet, and as this is your first pneumatic, I figured I should make sure that you know to use primer when cementing the gun together.

EDIT: I read the thread more carefully, and noticed that you did mention using primer. Sorry about that :D
Better someone mention it without needing to than not saying anything when they needed to :wink:


Thanks. I think I'm going to make a wooden brace to make sure it's Centered. I didn't want it behind those elbows, but because they are so big I have to do the annoying square thing. Is there a way to have the barrel snug against the chamber WITHOUT having to use all of those elbows in that way?

-EDIT-
11/20/2010 5:41 pm Pacific

GORDON FREEMAN!

-EDIT2-

Not to get ahead of myself, but I eventually have to figure this out. I need a reusable ammo i can stuff into a half inch barrel. Preferably air tight like a potato slug. Any suggestions?
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Unread postAuthor: mlz3000 » Sat Nov 20, 2010 11:13 pm

Nerf Darts are fun.

Most people seem to use braces rather than making their barrels close to their chambers. Like this one.
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Unread postAuthor: Yukondano2 » Sun Nov 21, 2010 12:39 pm

mlz3000 wrote:Nerf Darts are fun.

Most people seem to use braces rather than making their barrels close to their chambers. Like this one.


What does that brace consist of? I see them but I have no idea WHAT it is.
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Unread postAuthor: Gun Freak » Sun Nov 21, 2010 12:54 pm

HAHAYYY thats my gun :D
For my brace, I used a block of wood, and a hole saw to cut cirles out of the appropriate size. The I cut the circles off halfway to make semi-circle holes in which the barrel and chamber sit in. A hose clamp or similar can be used to secure it.
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