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my new piston/gun design (ADDED: pics of my toolie 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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Unread postAuthor: glass_05 » Wed Jun 17, 2009 10:18 am

the stopper doesnt go all the way into the pipe. so i dont see how it could get stuck
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Unread postAuthor: Gaderelguitarist » Wed Jun 17, 2009 11:17 am

A piston in a T at the breech of the barrel would be low dead space and still be over/under design.


I had suggested a Tee valve in the beginning of this thread :roll:
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Unread postAuthor: glass_05 » Wed Jun 17, 2009 11:30 am

yes. i understand a tee would have been the best option. but when i ordered parts i didnt order that, and i didnt want to wait another week for a tee.

i also like the idea of the toolie piston and wanted to test it out
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Unread postAuthor: Gaderelguitarist » Wed Jun 17, 2009 11:35 am

No worries. You built what you wanted to build.
Thats what makes the hobby fun, not building what other people to tell you.

The fact that you were the one to first put up a Toolies valve to modify your own design is good enough for me.
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Unread postAuthor: Biopyro » Wed Jun 17, 2009 3:47 pm

Technician1002 wrote:Edit; removed reference to QDV as requested.

Requested?

A QDV would be just as relevant as a toolie for this gun. That much dead space warrants a good valve.
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Unread postAuthor: Brian the brain » Wed Jun 17, 2009 4:03 pm

Toolie valves are cool!

They enable you to place the exhaust valve in a completely different manner..

That way you won;t end up with just another T-valved cannon..

something a bit more original..dead space or not!
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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: daberno123 » Wed Jun 17, 2009 4:08 pm

Has anybody tried a toolies piston in a tee configuration? That would combine better flow and cut down on weight because the rod isn't as long.

Something like this
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Unread postAuthor: glass_05 » Wed Jun 17, 2009 6:22 pm

gun is drying right now. from our test fire it is going to work. will know for sure tomorrow. tomorrow night expect it to be in the gun showcase with alot of pics and a write up
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Last edited by glass_05 on Wed Jun 17, 2009 6:53 pm, edited 1 time in total.
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Unread postAuthor: Technician1002 » Wed Jun 17, 2009 6:52 pm

Biopyro wrote:
Technician1002 wrote:Edit; removed reference to QDV as requested.

Requested?

A QDV would be just as relevant as a toolie for this gun. That much dead space warrants a good valve.


I got two PM's for over posting it on too many threads. So I'm posting it less as requested. It will show in searches.
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Unread postAuthor: mobile chernobyl » Wed Jun 17, 2009 10:41 pm

daberno123 wrote:Has anybody tried a toolies piston in a tee configuration? That would combine better flow and cut down on weight because the rod isn't as long.

Something like this


Yep - That's the exact idea behind my "palindrome" piston. Works great! I have it employed in my "1 gallon" lancher, and a similar design in my "10 gallon" launcher.
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Unread postAuthor: daberno123 » Thu Jun 18, 2009 10:56 am

mobile chernobyl wrote:Works great!


Good to hear! I'm thinking about going even smaller and using it in conjunction with a pop-off for a full-auto airsoft gun.
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Unread postAuthor: glass_05 » Thu Jun 18, 2009 3:17 pm

who ever said the rubber stopper would get stuck was kind of right. instead of getting stuck, at 80psi the 2.5 inch rubber stopper was pushed all the way through the 2inch pipe and even bend the rod and went around one of the elbows. cut the gun in half and fixing it now. putting a big washer behind the stopped to prevent it from happening again

but when that stopper went all the way through it released the air and it was insane!
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Unread postAuthor: Technician1002 » Thu Jun 18, 2009 5:18 pm

glass_05 wrote:who ever said the rubber stopper would get stuck was kind of right. instead of getting stuck, at 80psi the 2.5 inch rubber stopper was pushed all the way through the 2inch pipe and even bend the rod and went around one of the elbows. cut the gun in half and fixing it now. putting a big washer behind the stopped to prevent it from happening again

but when that stopper went all the way through it released the air and it was insane!


:D Maybe a hard washer on both sides of the rubber may prevent that, but then it goes back to the original question. Will it get pushed in tight and stick?
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Unread postAuthor: glass_05 » Thu Jun 18, 2009 10:47 pm

we sanded it down a little bit in the back so if it does get pushed it we can get it out. and the washer will prevent it from going in all the way.

Will be testing again tomorrow. Kind of sucked that we had to cut the gun in half and the elbows off to fix it
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