108Views11Replies

Author Options:

what would be a good material to use for the piston Answered

What would be a good material to use for a piston other than pvc rod that's too expensive. I was thinking along the lines of cast epoxy or shapelock. I need a material that's pretty cheap too.

11 Replies

user
Kiteman (author)2008-09-14

What dimensions are you planning on making it?

Select as Best AnswerUndo Best Answer

user

I was thinking a two inch, like a mauler valve.

Select as Best AnswerUndo Best Answer

user

You could try discs of plywood, bolted through the centre or epoxied. If weight is a problem, maybe replace the middle layers with expanded polystyrene?

Select as Best AnswerUndo Best Answer

user

tHANKS FOR THE HELP BUT i'M TYING TO FIND SOME THING EASY TO USE THAT DOESN'T REQUIRE WATER PROOFING. P.S. MY CAPS LOCK IS STUCK ON.

Select as Best AnswerUndo Best Answer

user

You can buy "marine ply" that is already waterproof. PS. I noticed!

Select as Best AnswerUndo Best Answer

user

sorry, I didn't want you to think I was yelling though.

Select as Best AnswerUndo Best Answer

user
Lftndbt (author)2008-09-15

Use a bolt, two washers, two nuts and a thick piece of rubber cut to size. Or a plumbing rubber washer if you can find one the same size. Sandwich the rubber washer between the two steel washers. Tighten with nuts. Lubricate the rubber washers and there's your piston..

Select as Best AnswerUndo Best Answer

user
Lftndbt (author)Lftndbt2008-09-15

Are you set on a piston setup? You could achieve similar results with a garden 9V irrigation valve. My last cannon ran through a "pop it" valve . It was a sand blaster handset..

Select as Best AnswerUndo Best Answer

user

YEAH I'M KIND OF SET ON A PISTON VALVE BUT THANKS FOR YOUR HELP ANYWAYS.

Select as Best AnswerUndo Best Answer

user

I'm working on a mini coaxial now 1.5 inch chamber and half inch barrel. instructable coming soon.

Select as Best AnswerUndo Best Answer

user
bob the builder #1 (author)2008-10-28

good news! I fixed the caps lock problem!

Select as Best AnswerUndo Best Answer