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Need piston ideas

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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Need piston ideas

Unread postAuthor: jonnyboy » Mon May 26, 2008 1:34 pm

Does anyone have an idea for a piston that fits well inside a 3'' tee pipe?

Thanks
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Unread postAuthor: Carlman » Mon May 26, 2008 1:48 pm

you do know the piston sits and operates in a 3" pipe or fitting not the acutual T dont you?
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Unread postAuthor: jrrdw » Mon May 26, 2008 1:49 pm

Bottom of a aerosol can.
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Unread postAuthor: MrCrowley » Mon May 26, 2008 2:05 pm

jrrdw wrote:Bottom of a aerosol can.

Really? I thought that's 2".


@johnnyboy,

I have no idea, 3" pistons are probably the worst to work with. Go 4" :)
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Unread postAuthor: jonnyboy » Mon May 26, 2008 2:15 pm

MrCrowley wrote:
jrrdw wrote:Bottom of a aerosol can.

Really? I thought that's 2".


@johnnyboy,

I have no idea, 3" pistons are probably the worst to work with. Go 4" :)

Any ideas for that? I will if I can find the stuff for one.
I will need:
3- 2-4 pipe increaser's

Home depot has not had a decent pvc section...


MERGED:

Carlman wrote:you do know the piston sits and operates in a 3" pipe or fitting not the acutual T dont you?

Yes it fits inside a 3'' tee.
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Unread postAuthor: SpudFarm » Mon May 26, 2008 2:19 pm

talk to a metal guy an make him cut out a disk of aluminium that you can bolt a sealing face onto
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Unread postAuthor: jrrdw » Mon May 26, 2008 2:20 pm

Take a ruler to the store, I'm sure you can find one.
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Unread postAuthor: jonnyboy » Mon May 26, 2008 2:30 pm

spudfarm wrote:talk to a metal guy an make him cut out a disk of aluminium that you can bolt a sealing face onto

Just a disk or a small cylinder?
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Unread postAuthor: SpudFarm » Mon May 26, 2008 2:33 pm

try to understand of this
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Unread postAuthor: psycix » Mon May 26, 2008 2:48 pm

Argh another "piston idea" topic! Is it really that hard to imagine something of your own?
Walk around the house, find some stuff that fits in, put some duct tape around and attach some inner bike tire DONE.
Or just cast one out of hot glue.

Just take a ruler and measure all cillindrical stuff you see, also check stores where they sell pvc, measure up some endcaps and stuff.
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Unread postAuthor: no-limit » Mon May 26, 2008 10:10 pm

Wow, great advice! Think I'll build a space ship and fly to mars!
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Unread postAuthor: watto » Mon May 26, 2008 10:26 pm

How about a tin of something, go to the shops with some 3" pipe and I'm sure there will be something that fits good, or just use epoxy or wood.
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Unread postAuthor: Biopyro » Tue May 27, 2008 3:48 am

Try using polymorph. It's inexpensive very durable and also very light.
You can have the back hollow to reduce weight further, then just put a polymorph cover over that to keep the pilot volume down.
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