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piston

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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piston

Unread postAuthor: hunter1992 » Wed Apr 04, 2007 11:34 pm

I have been trying to come up with a good piston desighn for awile. I got the idea for the piston from a post on the forum but i don't remember what post... I plan to use the black rubber back as a bumper. But I am thinking i might have to increase the angle on the piece of black rubber and grind down the metal washer against the black piece of rubber. Any comments on how i could inprove the piston would be greatly apreciated.

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Last edited by hunter1992 on Thu Apr 05, 2007 12:12 am, edited 2 times in total.

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Unread postAuthor: chaos » Wed Apr 04, 2007 11:37 pm

that should work mate well done.

the only problem i see with it is the sealing face,
it may and more than likely will blow off after a decent pressure shot, i suggest maybe a decent washer to hold it there.

peace
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Unread postAuthor: mega_swordman » Thu Apr 05, 2007 4:02 am

Hmm, yes good. Very nice, it should work fine, though I can't help but to think that the black rubber might flip inside out. Like chaos said, just get one secure washer and bolt for it.
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Unread postAuthor: Matheusilla » Thu Apr 05, 2007 8:23 am

Will it seal in the cylinder? You would get more performance if it had some better sealing, like where people usually put o-rings. I like your piston anyways, very simple, good use of materials.
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Unread postAuthor: locksmith » Thu Apr 05, 2007 12:29 pm

Great job let us know how it works out when you fire it
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Unread postAuthor: hunter1992 » Thu Apr 05, 2007 1:12 pm

the back part was lathed out of a solid piece of rubber and its NOT coming out of the bolt. I have no doubt that it will seal the chamber. As it is, im thinking it well seal it to well and wont let air past very well to fill the chamber. Pretty much everything on the piston is battle worthy exept the hex nuts. I need to secure them better.
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Unread postAuthor: Brian the brain » Wed Oct 10, 2007 1:56 pm

The washer "supporting" the lathed rubber plug should go.It has no function and obstructs the one way function wich depends on the edge flexing inward.
THe sealing surface, as said before, will blow off the bolt when enough ( is there such a thing?) pressure is applied.
I suggest you use the washer you DON"T need in the back to solve that problem.
Other than that, this thing is a beauty!
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 10, 2007 2:06 pm

In a nutshell:
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Unread postAuthor: Brian the brain » Wed Oct 10, 2007 2:25 pm

Basicly..yes, but don't put the thing in a nutshell...nutshells are notoriously bad at handling pressure..


They tend to go...nuts
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: hunter1992 » Tue Nov 13, 2007 5:01 pm

Yah i finaly got a computer working properly........ I have used the launcher hundreds of times over the months and it was worked perfectly. At first I didn't plan on using the back washer but after i lathed the rubber back piece it was a little softer than what i wanted so i put the washer on. It leaves just anough rubber unsupported to let air pass by. And yes i did re secure the sealing face with a washer.
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Unread postAuthor: chaos » Wed Nov 14, 2007 12:17 am

good on ya mate! nice to hear it worked out ok.
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 14, 2007 2:47 am

Go on, show us the completed launcher :)
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