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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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Unread postAuthor: hi » Sat Jan 19, 2008 8:42 pm

you can mold it from hot glue. i made a 2'' piston once. kinda messy and it uses several glue sticks, but it works.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: thespeedycicada » Sat Jan 19, 2008 9:24 pm

ok guys thanks but i found one and am using a 1 inch end cap sanded down a bit.
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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: hi » Sat Jan 19, 2008 10:07 pm

thespeedycicada wrote:ok guys thanks but i found one and am using a 1 inch end cap sanded down a bit.


i tried that on my first coaxial. it failed miserably. hence, i molded it out of hot glue...
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: thespeedycicada » Sat Jan 19, 2008 10:12 pm

why did it fail?
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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: hi » Sat Jan 19, 2008 10:14 pm

it wasn't round enough. it was not very smooth and it was uneven.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: pizlo » Sat Jan 19, 2008 11:54 pm

so your saying you cant sand for beans?
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Unread postAuthor: bigbob12345 » Sat Jan 19, 2008 11:59 pm

I think you should just get some hot glue and mold it but if that is not an option I would suggest my earlier idea with the milk caps it would be so lightweight you woldnt need a bumper. I have not tryed it but I would be surprised it didnt work.
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Unread postAuthor: noob of noobs » Sun Jan 20, 2008 2:16 pm

Yes, my 1" coupler worked nicely, but I recently found that the good old washers on a bolt design works quite nicely if you use the "100% ceal with no o-rings," method found in the how-to section. I just finished the valve for my biggest cannon, and it works amazingly well.
But yeah, hot glue works well too. Plus I've found that you don't need a bumber for hot glue.
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Unread postAuthor: thespeedycicada » Sun Jan 20, 2008 2:26 pm

thats ok guys the gun is complete and working i will post soon :D
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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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