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piston questions

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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piston questions

Unread postAuthor: gabeb123 » Fri Apr 02, 2010 10:50 am

ok i got 2 questions

1. i want to make a piston valve but i don't have to equipment to machine pvc so i decided i will either make it out of wax or epoxy. my question is could i just take a peace of 2" pvc and coat the inside with oil and then just poor in my melted wax?

2. i seen this site http://www.members.tripod.com/potatogun ... valve2.htm

and with that rubber washer thing is their a hole in that or does the air enter threw the sides of that metal washer.

thanks
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Unread postAuthor: Gun Freak » Fri Apr 02, 2010 11:02 am

Don't make one out of wax. It will break on the first shot.
Unless you use 5 psi :D
Also that valve on that site is a chamber sealer, don't make one. If I were you I wouldn't make a piston valve at all, they are too much trouble. But if you do decide to make one, make a barrel sealer.
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Unread postAuthor: gabeb123 » Fri Apr 02, 2010 11:04 am

oh ok well i guess ill make it out of epoxy then but that sounds hard lol
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Unread postAuthor: Gun Freak » Fri Apr 02, 2010 11:16 am

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Unread postAuthor: mark.f » Fri Apr 02, 2010 3:37 pm

If you're making a 2" piston 1-1/4" PVC SCH-40 fittings fit very well in 2" SCH-40 pipe, and with patience can be made to include O-ring grooves by spacing pieces of fittings over some 1-1/4" pipe or a 1-1/4" male fitting like a plug.
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Unread postAuthor: Hubb » Fri Apr 02, 2010 3:41 pm

mark.f wrote:If you're making a 2" piston 1-1/4" PVC SCH-40 fittings fit very well in 2" SCH-40 pipe, and with patience can be made to include O-ring grooves by spacing pieces of fittings over some 1-1/4" pipe or a 1-1/4" male fitting like a plug.


http://www.mediafire.com/?yyay0yzvdqt

:D :D :D
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Unread postAuthor: MrCrowley » Fri Apr 02, 2010 3:43 pm

If I were you I wouldn't make a piston valve at all, they are too much trouble. But if you do decide to make one, make a barrel sealer.

Just because you can't get one to work :P

You have to figure out how to get one working sometime, so you may as well start now. They are incredibly useful. Though, I wouldn't recommend a piston valve for a first build.
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Unread postAuthor: gabeb123 » Fri Apr 02, 2010 3:52 pm

this isnt my first build i built one with a sprinkuler valve that i modded. i just havent put it on this site yet because it was winter and i couldnt shoot it but ill get it on this site as soon as i can borrow someones camera.


hey would this work?

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 602_263622
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Unread postAuthor: metalmeltr » Sat Apr 03, 2010 2:32 pm

Any 5 minute epoxy from the local hardware store should work. A longer dry time would be even better since you would not be rushing aroung once you have the epoxy mixed.
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Unread postAuthor: mark.f » Sat Apr 03, 2010 2:42 pm

Hubb wrote:
mark.f wrote:If you're making a 2" piston 1-1/4" PVC SCH-40 fittings fit very well in 2" SCH-40 pipe, and with patience can be made to include O-ring grooves by spacing pieces of fittings over some 1-1/4" pipe or a 1-1/4" male fitting like a plug.


http://www.mediafire.com/?yyay0yzvdqt

:D :D :D


http://i43.tinypic.com/143kni8.jpg

Clide was very helpful when I was going about making my first o-ringed piston valve. :)
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