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First decent 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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First decent piston

Unread postAuthor: elitesniper » Sun Jan 20, 2008 5:52 pm

well this is my first decent piston the first one sucked so much i mean like it had a good bumper but the piston deformed its self after the 20th and wouldnt fit no more so i got pissed and decided to make a new valve, i dont think this should belong in the cannons showcase cause, its not a cannon :lol:
this piston is going to be for my 2 inch tee 1.5 inch porting. the sealing face is the middle section of a toilet plunger very think stuff man :wink: the back is held in with a old pressure gauge i took apart fits very well in the 1.25 coupler. the rubber from the toliet bowl plunger should seal well i hope, do you guys think it will?
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Attachments
pistonparts.JPG
parts
sealingfaces.JPG
the sealing face
sidepi.JPG
hold.JPG
backpiston.JPG
the back
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Unread postAuthor: MaxuS the 2nd » Sun Jan 20, 2008 6:02 pm

That's a nice piston if I may say so myself.
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Unread postAuthor: LikimysCrotchus5 » Sun Jan 20, 2008 6:02 pm

Looks good. But i think the wing nut isnt neccesary. You should just get a regualr nut.
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4SPC, My 4" piston 3" porting cannon
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Unread postAuthor: elitesniper » Sun Jan 20, 2008 6:05 pm

ha i dont have regular nuts :lol: it holds the whole sealing face together, do you think the sealing face is seal good against the 1.5 sch40 barrel/
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Unread postAuthor: ALIHISGREAT » Sun Jan 20, 2008 6:19 pm

oooh thats ice construction, although you really should fill in the back with a removable plug or something to reduce pilot volume :wink:
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Unread postAuthor: bigbob12345 » Sun Jan 20, 2008 6:39 pm

Good job you got yourself a well made piston :D
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Unread postAuthor: elitesniper » Sun Jan 20, 2008 6:43 pm

how does expanding foam sound? :wink: , pistons dont really need oring s right?
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Unread postAuthor: bigbob12345 » Sun Jan 20, 2008 6:49 pm

Pistons dont need orings unless its a chamber sealing valve.
I think I will post my piston I am working on see if I can get any advice.
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Unread postAuthor: elitesniper » Sun Jan 20, 2008 6:54 pm

i thought orings were for barrel sealers to just so they could pilot better
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Unread postAuthor: MrCrowley » Sun Jan 20, 2008 7:09 pm

Yeah they are, if you can be bothered making o-ring grooves.
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Unread postAuthor: elitesniper » Sun Jan 20, 2008 7:17 pm

nah tto hard to get a straight oring line i tried it with the drill and a kinfe made a good groove but not to straight. Like my piston Mr.C? :lol: o yea do you think the toliet plunger rubber will seal good as neoprene?
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Unread postAuthor: MrCrowley » Sun Jan 20, 2008 7:20 pm

Oh yeah forgot I hadn't commented, looks good, nice and solid.
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Unread postAuthor: elitesniper » Sun Jan 20, 2008 7:22 pm

thanks :lol: will the tolit plunger rubber seal pretty good?
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Unread postAuthor: MrCrowley » Sun Jan 20, 2008 7:25 pm

No idea, only one way to find out.
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Unread postAuthor: elitesniper » Sun Jan 20, 2008 7:30 pm

dump it in hydrocloric acid? :lol: jk yea i have to ask my tech teacher for some 2 inch pipe first , i have none and i dont wana go to homedepot for it,i only have 1.5 for the barrel :D
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