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Piston Valve Airgun 3/4"

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: DerpWithAGun » Tue Aug 02, 2011 1:28 am

Alright will do thanks for the help! How do i make a notch? Saw, file?
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Unread postAuthor: Mr.Tallahassee » Tue Aug 02, 2011 1:30 am

Saw would work better. Either way, make sure to smooth the rough edges as to not damage the o-rings.
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Unread postAuthor: DerpWithAGun » Tue Aug 02, 2011 2:15 am

Now I'm pissed! I cut the notch and only really small amounts of air pass through. My gauge said 60 PSI and then i waited and the arrow would stop at 60 for a few seconds. Then it would drop down to 40 instantly. Another few seconds and instantly jumps from 40 to 20 then 0. I'm really pissed I don't know where any of the leaks are there aren't any hissing noises. This is retarded.
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Unread postAuthor: Mr.Tallahassee » Tue Aug 02, 2011 2:34 am

Picture of the piston? You may not have cut the notches large enough.
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 02, 2011 2:54 am

Fill a bath with water and find out where the leaks are coming from.
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Unread postAuthor: DerpWithAGun » Tue Aug 02, 2011 3:07 am

I'll cut them larger now, if it still continues not to work I'll upload a picture. I'll also try out that bath trick...
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Unread postAuthor: Gun Freak » Tue Aug 02, 2011 8:06 am

Didn't we explain the whole notch concept before? :roll:

Use a file to cut them. It will make it cleaner. You don't want metal shards to cut up your o-rings.
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Unread postAuthor: MathiasDK » Tue Aug 02, 2011 1:08 pm

MRR wrote:Here you go. I set the video to not listed because in my opinion it is not appropriate for some people on YouTube.
[youtube]http://www.youtube.com/watch?v=vmxaI3_SJCg[/youtube]

Awesome video RedRooster:-).
I've got a question, about the barb hose thing..
In my country ( Denmark), they don't sell threaded barb hose things.
Is there anything else that I could use instead?
And instead of grease, when making the piston, could I use baby oil instead? Or Vaseline if you've ever heard of that...
Hope you answer...
Thanks:-)
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Unread postAuthor: MRR » Tue Aug 02, 2011 2:11 pm

Instead of a hose barb you could use solder fittings, these threaded brass fittings you solder copper pipes into. Vaseline or baby oil works fine, an alternative is talcum powder.
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Unread postAuthor: DerpWithAGun » Tue Aug 02, 2011 4:21 pm

Gah! I give up! It doesn't work at all! If it wouldn't let air through and fill the chamber I cut the washer a bit more every time it didn't work. I've now cut it so much I cant cut it anymore. This is ridiculous. My web cam on my laptop has bad resolution so I can't upload pictures because you wont be able to see the notches. Anyway thanks for all the help! I don't think my fittings are 3/4". I think they are smaller so that's probably why it wont work. 'Cause all my stuff is too small....
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Unread postAuthor: jrrdw » Tue Aug 02, 2011 4:58 pm

DerpWithAGun wrote:Gah! I give up! It doesn't work at all! If it wouldn't let air through and fill the chamber I cut the washer a bit more every time it didn't work. I've now cut it so much I cant cut it anymore. This is ridiculous. My web cam on my laptop has bad resolution so I can't upload pictures because you wont be able to see the notches. Anyway thanks for all the help! I don't think my fittings are 3/4". I think they are smaller so that's probably why it wont work. 'Cause all my stuff is too small....


Why don't you re-group and change your direction and start off with a simple combustion. They are just tons of fun, simple to build and you sound like you could use some fun right about now...
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Unread postAuthor: saefroch » Tue Aug 02, 2011 5:37 pm

DerpWithAGun wrote:Gah! I give up! It doesn't work at all! If it wouldn't let air through and fill the chamber I cut the washer a bit more every time it didn't work. I've now cut it so much I cant cut it anymore. This is ridiculous. My web cam on my laptop has bad resolution so I can't upload pictures because you wont be able to see the notches. Anyway thanks for all the help! I don't think my fittings are 3/4". I think they are smaller so that's probably why it wont work. 'Cause all my stuff is too small....
Spudding is not for the easily frustrated. Maybe if we had pictures of your piston, we could help.
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Unread postAuthor: MathiasDK » Sat Aug 06, 2011 3:21 pm

MRR wrote:Instead of a hose barb you could use solder fittings, these threaded brass fittings you solder copper pipes into. Vaseline or baby oil works fine, an alternative is talcum powder.

I made some homemade hose barb with a hammer, a 1/2" pipe, a 3/4" to 1/2 fitting.. Hammered the 1/2" into the other fitting..
I made a piston and All that, and it actually worked once.. then one of the o rings on the piston were missing after the first shot... i've used similar o rings, and now i just doesent work..
i really dont know what went wrong...

By the way could you give me a name on the fitting you talked about..
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Unread postAuthor: saefroch » Sat Aug 06, 2011 9:15 pm

The o-ring probably blew out. Can we have pictures?
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Unread postAuthor: MRR » Sun Aug 07, 2011 2:26 am

@MathiasDK They are actually called solder fittings.
Image
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