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Good 1.5 in piston?

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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Good 1.5 in piston?

Unread postAuthor: thespeedycicada » Sat Jan 19, 2008 12:20 am

well sorry for the noobish question but my hot glue gun is nowhere to be found and my epoxy is all cogealed and unusable ssoooo whats a good premade piston for 1.5 inch sch40?
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Last edited by thespeedycicada on Sat Jan 19, 2008 10:43 am, edited 1 time in total.
current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: elitesniper » Sat Jan 19, 2008 12:23 am

why would you want to make a 1/2 inch piston? performance wouldnt be so well you should do at least 1.5 inch or higher for really good performance
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Unread postAuthor: bigbob12345 » Sat Jan 19, 2008 12:24 am

you now those crayola markers they fit perfectly in 1/2in sch40 Im sure you could convert that into a piston somehow.
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Unread postAuthor: Zen/// » Sat Jan 19, 2008 12:24 am

There are alot of high power guns with 1/2 or 3/4 inch pistons.
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Unread postAuthor: th3p0p0 » Sat Jan 19, 2008 12:28 am

i used a 1" plug and put tape on it till it fit. I JB welded the sealing face on.

but i used 1/2" for the barrel.
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Unread postAuthor: Carlman » Sat Jan 19, 2008 12:31 am

your title does not match your question, did you forget to edit your question aswell after elitesniper posted his response?

As for the piston, you could melt the hot glue in a pan or similar then pour into your coupling. As done in the BCvids tutorial on a piston valve.
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Unread postAuthor: FordGtMan » Sat Jan 19, 2008 1:26 am

I used a sanded down dowel. Takes a little effort, but annoying.
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Unread postAuthor: jon_89 » Sat Jan 19, 2008 1:54 am

chap stick cap with a rubber sealing face glued on. :wink:
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Unread postAuthor: thespeedycicada » Sat Jan 19, 2008 10:42 am

OHH wait sorry its a piston for 1.5 inch pipe not 1/2 inch.
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: bigbob12345 » Sat Jan 19, 2008 11:07 am

I guess you could be creative and glue 5 milk jug caps together because they fit nice and snug in 1.5in pipe
I just relized that that would be a very effective piston even more effective than a proper hot glue or epoxy one because of the light weight.
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Unread postAuthor: pizlo » Sat Jan 19, 2008 11:49 am

Another noobie question from me. I understand fully how a piston works,(all 3 kinds) but how tight does the hit is the tee for a coax, or a barel sealing?
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Unread postAuthor: thespeedycicada » Sat Jan 19, 2008 2:07 pm

Pizlo i dont understand your question.

sooo nobody has any more ideas? :(
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: pizlo » Sat Jan 19, 2008 8:09 pm

who thats weird how did I totally miss thaT typo. I was wondering how tight the actual piston need to be withing the outer pipe of a coaxial piston valve.
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Unread postAuthor: noob of noobs » Sat Jan 19, 2008 8:24 pm

On my very first piston valve (1.5"), I sanded down a 1" coupler (I think it was 1") and used some washers, a bolt, and a bike tube squeezed onto the face.
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Unread postAuthor: pizlo » Sat Jan 19, 2008 8:35 pm

and it held up?
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