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Bondo Piston

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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Bondo Piston

Unread postAuthor: clemsonguy1125 » Mon Apr 26, 2010 2:55 pm

For my compact piston valve, I casted a bondo piston to slide in the bushing. I was planning to use a rubber gasket as the bumper but will this be enough. I want the thinest possible bumper that will work. Also how does bondo work as a piston. I was a little worried about it cracking but it doesnt seem to brittle .
Thanks, Clemsonguy1125
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Last edited by clemsonguy1125 on Mon Apr 26, 2010 3:26 pm, edited 1 time in total.
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Unread postAuthor: iknowmy3tables » Mon Apr 26, 2010 3:20 pm

could you clarify what exactly your question is?
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Unread postAuthor: clemsonguy1125 » Mon Apr 26, 2010 3:26 pm

Sorry,
Does bondo crack if used for a piston?
Would a rubber gasket work for a bumper?
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Unread postAuthor: Gun Freak » Mon Apr 26, 2010 3:53 pm

I would use bigger than a rubber gasket... maybe like three. Or you could epoxy a couple little springs around the gasket to bump it even better. I still think you should use a plug instead of a bushing, but too late :P
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Unread postAuthor: clemsonguy1125 » Mon Apr 26, 2010 4:15 pm

It wouldnt work any better because screws world be sticking out in a plug, and its not to late thats an old picture when the cap piston was in it
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Unread postAuthor: Gun Freak » Mon Apr 26, 2010 4:25 pm

Ohhh...

yeah the screws would be sticking out.. or you could get short ones... or you can use threads and not put any screws in at all.
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Unread postAuthor: clemsonguy1125 » Mon Apr 26, 2010 5:26 pm

To late the tees already installed and this is slightly more compact
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Unread postAuthor: Gun Freak » Mon Apr 26, 2010 6:39 pm

Ok... as you say... Good luck!
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Unread postAuthor: clemsonguy1125 » Mon Apr 26, 2010 8:20 pm

Thanks, good luck to you too
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Unread postAuthor: cannon monkey » Mon Apr 26, 2010 8:44 pm

thanks for the info :D i been thinking of making a bondo piston
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Unread postAuthor: clemsonguy1125 » Mon Apr 26, 2010 9:00 pm

I have no idea how well it will work but it's worth a shot
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Unread postAuthor: metalmeltr » Thu Apr 29, 2010 2:48 pm

Bondo is brittle. It is not intended to be built up to the thickness that is achived by making pistons. If you try Duraglass or Allmetal you may come up with a more durable piston since Allmetal and Duraglass are renforced with aluminum powder and fiberglass respectively.
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Unread postAuthor: clemsonguy1125 » Thu Apr 29, 2010 3:06 pm

Well since I already built it Ill try it but your probably right, If it breaks Ill just uses a 1 1/2 inch plug sanded down

Edit-Just found AngryChauncey gun that uses a bondo piston
heres the pic
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