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Very high-pressure hand pump

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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Very high-pressure hand pump

Unread postAuthor: Gunner » Sat Nov 10, 2007 3:54 pm

Is it possible to make homemade hand pump that can goes up to 800psi?
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Re: Very high-pressure hand pump

Unread postAuthor: Novacastrian » Sat Nov 10, 2007 3:58 pm

Gunner wrote:Is it possible to make homemade hand pump that can goes up to 800psi?


Yes it is. But it wouldn't be something i would want to make.
The volume of air you could expel would be extremely limited.
Have a look at Ragnaroks HEAL cannon in the pneumo showcase, he has made a pump that goes to 320psi or higher.
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Unread postAuthor: DYI » Sat Nov 10, 2007 4:25 pm

Most methods of getting pressure that high in homemade systems (i.e. gas rams or low volume pumps) produce a very low volume of gas. Just use unregulated CO2 unless this is for something as small as a pellet gun.
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Unread postAuthor: Hawkeye » Sat Nov 10, 2007 5:18 pm

It is much easier than you would think. The old Girandoni gun from hundreds of years ago used a simple stirrup pump. The key is a long pump with a very narrow bore that you can bounce your weight against to force more air into it. They usually used two pumps for this. One of a higher volume and then switched to the slimmer pump for topping up the cylinder when the pumping got harder.
BTB made one that he suffered an accident with that was around 1000 psi when the check valve popped and shot the handle into his face.
If you are going to go past 500 psi you have to start thinking of a way to get multiple shots from it though.
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Unread postAuthor: POLAND_SPUD » Sat Nov 10, 2007 6:14 pm

you might try using this 'compressor' - http://www.spudfiles.com/forums/several ... rt,15.html

I can get 300psi and more with this - well it's not 800 but at least you don't have to use your own muscles
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Unread postAuthor: LikimysCrotchus5 » Sat Nov 10, 2007 6:30 pm

Or you could use this brilliant idea for a pneumatic rod that was just posted as a topic and the approved in theory by JSR

here ya go :D
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Unread postAuthor: DYI » Sat Nov 10, 2007 7:35 pm

I believe I mentioned that. That absurdly large size of pneumatic ram that you would need to generate a decent volume of compressed gas makes it impractical for all but small launchers. Although if you want 1000+ psi output from a crappy bike pump, that's the way to go.
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Unread postAuthor: hi » Sat Nov 10, 2007 7:43 pm

yes you could, just use a tube about 1/16'' diameter... ( I.E. its not practical)
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Unread postAuthor: DYI » Sat Nov 10, 2007 7:47 pm

With a tube 1/16" in diameter you could pump up to 5000 psi effortlessly, and well over 15000 psi with a bit of work. Might take weeks though...
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Unread postAuthor: Hawkeye » Sat Nov 10, 2007 8:27 pm

Why would it take so long? Reduce the chamber size you are pumping into. It wouldn't take that small a pump cylinder size either. A 20 inch x 3/4 copper pump reaches 350 with little effort. A thick walled half inch copper pump would be good for quite a bit more. It wouldn't be too hard to have a very high pressure pump made by someone with access to a lathe.
On Barnes Pneumatic, the owner made a pump that went to 800 psi.
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Unread postAuthor: DYI » Sat Nov 10, 2007 8:32 pm

With a pump chamber .5" in diameter, it would take slightly over 150 pounds of force to push down the handle at 800 psi. Certainly doable, but once again it would only be good for relatively low volumes.
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 10, 2007 8:55 pm

LikimysCrotchus5 wrote:Or you could use this brilliant idea for a pneumatic rod that was just posted as a topic and the approved in theory by JSR


I see my word has become some sort of ISO standard hehe *sigh*
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Unread postAuthor: Brian the brain » Sun Nov 11, 2007 10:36 am

I've made one and nearly knocked my teeth out when it broke.
THe handle hit me in the face, two teeth were loosened, one got chipped.The inside of my upper lip was cut up pretty bad.
The gums were torn off my front teeth.They still look weird, kinda "dawn of the dead" like..
I might have broken part of my upper jaw, but if I did, It healed on it"s own.It felt wiggly for some time.
My nose still "pops"when I touch the tip of it, it didn't before.
I did how.ever reach over 900 psi.You want blueprints??
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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: dauphinoise potato » Sun Nov 11, 2007 10:40 am

Brian the brain wrote:I've made one and nearly knocked my teeth out when it broke.
THe handle hit me in the face, two teeth were loosened, one got chipped.The inside of my upper lip was cut up pretty bad.
The gums were torn off my front teeth.They still look weird, kinda "dawn of the dead" like..
I might have broken part of my upper jaw, but if I did, It healed on it"s own.It felt wiggly for some time.
My nose still "pops"when I touch the tip of it, it didn't before.
I did how.ever reach over 900 psi.You want blueprints??



Yar please, what diameter was the pump body?
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It's all a bunch of tree huggin' hippie crap!
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Unread postAuthor: ALIHISGREAT » Sun Nov 11, 2007 10:53 am

dauphinoise potato wrote:
Brian the brain wrote:I've made one and nearly knocked my teeth out when it broke.
THe handle hit me in the face, two teeth were loosened, one got chipped.The inside of my upper lip was cut up pretty bad.
The gums were torn off my front teeth.They still look weird, kinda "dawn of the dead" like..
I might have broken part of my upper jaw, but if I did, It healed on it"s own.It felt wiggly for some time.
My nose still "pops"when I touch the tip of it, it didn't before.
I did how.ever reach over 900 psi.You want blueprints??



Yar please, what diameter was the pump body?


me two, i need a pump design so i can make a 250psi pump.
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