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Diffrent COAX piston.

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Diffrent COAX piston.

Unread postAuthor: blind909 » Wed Jul 16, 2008 3:27 pm

Has anyone ever made or seen THIS kind of piston? Skip to 4:20 to see how he made the piston. And the cannon Has 3 DWV fittings BTW.
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Unread postAuthor: Sticky_Tape » Wed Jul 16, 2008 3:39 pm

I think someone did not too long ago.
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You can tell how awesome a cannon is by the pressure used.
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Unread postAuthor: iisthemuffin » Wed Jul 16, 2008 3:40 pm

Theres honestly nothing different about it. Beside the fact that he put a cleanout cap on a pneumatic. Insted of putting the sealing face on the bottom of the can he put in on the inside. It is still a coax piston gun.
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Unread postAuthor: Hotwired » Wed Jul 16, 2008 3:42 pm

Well it's a normal barrel sealer.

Difference is he's using a can for support forward of the piston face instead of the usual practice of having a solid cylinder/bolt assembly behind it or using a flexible diaphragm.

DWV at 80psi isn't something I'd bang on his door about though.

Good to see variants from the norm pop up every now and again :)
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Unread postAuthor: CS » Wed Jul 16, 2008 4:04 pm

Neat man, thanks for posting this.

Seems like a fairly easy to build piston design, and has a stricter part list. Most piston designs leave a lot of guess work just because of different factors. Only problem with this design as far as copying would be to get the right thickness felt.

:)
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Unread postAuthor: blind909 » Wed Jul 16, 2008 4:28 pm

If you dont have felt, just wrap it in electrical tape.
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Unread postAuthor: jr » Wed Jul 16, 2008 10:07 pm

yeah, but the felt will slide better!. No lube required!
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Unread postAuthor: starman » Thu Jul 17, 2008 12:06 am

Given that standard cans fit fairly nicely in 3" sched 40, I'm surprised this hasn't been tried before now....although it may have, I just haven't seen it.

The piston face should seal well and the felt should do a great job limiting but allowing air around the can...the piston as a whole would be light for it's size...no chance it getting cockeyed in the cylinder. I'm frankly having a hard time coming up with disadvantages of this thing.
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