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does this piston look right.

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: 8tonsemi » Fri May 18, 2012 12:05 pm

Yeah you mean like cut it with a piece of 1 1/4 inch pipe inside the coupling?
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Unread postAuthor: 8tonsemi » Fri May 18, 2012 12:43 pm

Also how does a sanding drum work as a piston. And do I have to remove the sand paper from it? Sorry I'm kind of new to this
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Unread postAuthor: mattyzip77 » Fri May 18, 2012 7:36 pm

Yes and the o ring will be placed on the pipe with the coupling on either side of it. With the sanding drum ya u take the paper off and put a washer the same size on both ends with a bolt and nut and sealing face. You adjust it by tightening it till it slides perfectly. Dont forget to lube it.
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Unread postAuthor: 8tonsemi » Sun May 20, 2012 6:45 am

What do you guys think of the new one.(Bottom picture)
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Unread postAuthor: Gun Freak » Sun May 20, 2012 7:50 am

Uhhh why is it like a foot long?? :lol:
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Unread postAuthor: 8tonsemi » Sun May 20, 2012 8:13 am

Its actually only 7 inches should i shorten it?
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Unread postAuthor: mattyzip77 » Sun May 20, 2012 11:02 am

Damn that thing is huge!!! But, if it works, then it works. How big is you housing??? :shock:
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Unread postAuthor: 8tonsemi » Sun May 20, 2012 12:09 pm

2inch t and some 2 inch pipe behind it. And it's going to have a 1inch pilot.
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Unread postAuthor: 8tonsemi » Mon May 21, 2012 2:15 pm

Also what size chamber would you recommend.
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Unread postAuthor: MrCrowley » Mon May 21, 2012 3:43 pm

8tonsemi wrote:Also what size chamber would you recommend.

http://www.thehalls-in-bfe.com/GGDT/
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Unread postAuthor: mattyzip77 » Mon May 21, 2012 6:17 pm

Chamber and barrel should be to your likings, with a two inch tee as a housing I would use a 2 inch chamber prolly 4 to 5 feet long but thats me. If your making this from gun freaks tutorial look at his golf ball cannon or Mr. C's.
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Unread postAuthor: 8tonsemi » Tue Oct 09, 2012 4:51 pm

Sorry for the bump I just didn't want to start a new topic. This is my new piston its made out of a frisbee that I cut with a hole saw. I need to get a sealing face and another o-ring and this thing will be set.
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Unread postAuthor: mattyzip77 » Tue Oct 09, 2012 9:42 pm

I dont think its going to work. I think the plastic will cave once you hit it with pressure. You also need a washer to hold on the sealing face. Maybe it will though, keep your fingers crossed....
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Unread postAuthor: 8tonsemi » Wed Oct 10, 2012 7:51 am

Thanks Matty. I got a heat gun yesterday so I going to make out of sheet pvc instead
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Unread postAuthor: mattyzip77 » Wed Oct 10, 2012 4:32 pm

Save yourself the time and bullshit and just get a rubber sanding drum. Unless you have a lathe its the best piston your going to get...
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