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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: veginator » Sun Sep 16, 2007 9:16 am

1. What kind of pressures con a well made piston take?

2. What are the best materials for a piston?

3.How much psi is needed to get the valve into position?

Any replies or comments would be greatly appreciated.
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Unread postAuthor: DYI » Sun Sep 16, 2007 9:25 am

1. Depending on how well made it is, thousands of psi.

2. The best materials for pistons include lightweight, strong titanium alloys, carbon fiber, magnesium, UHMWPE, PTFE, etc...

3. A really good piston can be put into position with less than 1psi.

If you ask vague questions, you get equally vague answers.
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Re: Piston Questions

Unread postAuthor: jrrdw » Sun Sep 16, 2007 9:30 am

veginator wrote:1. What kind of pressures con a well made piston take?
2. What are the best materials for a piston?

3.How much psi is needed to get the valve into position?
Any replies or comments would be greatly appreciated.


Well made iron cannons, i've read 300 psi.

To many factors to list

To many factors to list.

You kinda have to know what you really want compaired to your abiltys to complete the cannon you have in mind to build.
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 16, 2007 9:32 am

tell us how big you want to make it and what materials you have access to and we can furnish you with more details.
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Unread postAuthor: veginator » Sun Sep 16, 2007 9:37 am

I want to have a four inch chamber and a 2.5 inch barrel. I have access to any thing you can find at a hardware store for under $100.
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 16, 2007 9:43 am

looks like a 3" endcap is your best option, have a look here?

edit: here, have some energy preditions ;)
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Unread postAuthor: veginator » Sun Sep 16, 2007 9:49 am

what would be a good alternitive to noeprene rubber. also what kind of pressures do you think that could take.
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 16, 2007 9:52 am

That can take whatever pressure the pipes and fittings it's made of can take, but it's important to have a bumper between the piston and the back of the chamber to soften the impact.

As to the rubber, there's a few suggestions here.
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