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3" Piston in a 3" Tee?

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: Mrcrouse1 » Fri Feb 13, 2009 2:09 pm

I have a friend with a metal lathe and is a highly skilled metal worker. Would an aluminum piston be a good idea?
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Unread postAuthor: jimschouster » Fri Feb 13, 2009 3:31 pm

If he can hollow it out, put a cap on it. weight might be a problem

http://i569.photobucket.com/albums/ss13 ... piston.jpg

Let me know if you need help
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Unread postAuthor: MrCrowley » Fri Feb 13, 2009 3:53 pm

Aluminium is already pretty damn light, for a three inch piston, it would probably weigh the same as a hot glue 2" piston if it was machined right. Regardless of that, piston weight isn't that big of an issue anyway, as long as you keep it at a reasonable weight.
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Unread postAuthor: Mrcrouse1 » Fri Feb 13, 2009 4:16 pm

Ok, cool, I might try that. Homedepot or lowes wouldn't stock sch40 3" tees and fittings and such would they?
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Unread postAuthor: jonnyboy » Fri Feb 13, 2009 4:17 pm

Mrcrouse1 wrote:Ok, cool, I might try that. Homedepot or lowes wouldn't stock sch40 3" tees and fittings and such would they?

They do but they aren't pressure rated. :cry:
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: Mrcrouse1 » Fri Feb 13, 2009 4:27 pm

Then where would I get a 3" tee that is pressure rated? Link to the acctual tee would be nice. I found one on mcmaster and grainger, both are sch 40, but mcmaster says it is rated at 0psi...
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Unread postAuthor: jonnyboy » Fri Feb 13, 2009 5:13 pm

Mrcrouse1 wrote:Then where would I get a 3" tee that is pressure rated? Link to the acctual tee would be nice. I found one on mcmaster and grainger, both are sch 40, but mcmaster says it is rated at 0psi...

This site has a good selection sprinkler.com
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: jimschouster » Sat Feb 14, 2009 5:00 am

Hi
SCH40 3" is rated at 260psi Max 70-120 should be safe, Home Depot sells it, make sure you don't get SCH20 Drain its very thin (Lets be Save) I lucked out and was able to use SCH80 Tee's from left overs on a job at work and decided to do all of it in sch80. cost more but 3" is rated at 370 2" is 400. McMaster-carr has SCH80 u can find it online cheaper. If you need help just email me jimschouster@yahoo.com

http://s569.photobucket.com/albums/ss139/jimschouster/
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