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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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Unread postAuthor: Brian the brain » Tue Nov 13, 2007 4:11 pm

I was being sarcastic guys...
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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: DYI » Tue Nov 13, 2007 4:22 pm

Sarcasm doesn't always translate well in text. The 900 psi bit did seem kind of strange though.
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Unread postAuthor: Brian the brain » Tue Nov 13, 2007 4:38 pm

the actual story is true, including the injuries.I used a 15 mm pipe with a 12 mm inside diameter.Pushing down with all my weight, I could easily compress it.The volume however was tiny.
When it blew I didn't even realise it, I just heard myself screaming, like it was somebody else..
An dthen I saw the blood..
I have been a bouncer for 8 years, and in all this time nobody has ever succesfully punched me in the face.No that I've quit I nearly klill myself...how ironic


I was just being sarcastic about the blueprint part.
.
That thing was too frickin dangerous, it could have killed me, you think I'll give you 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: DYI » Tue Nov 13, 2007 4:48 pm

Oh, sorry, I didn't realise what you were being sarcastic about. That must have been painful. What exactly was it that failed?
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Unread postAuthor: ALIHISGREAT » Tue Nov 13, 2007 4:51 pm

Brian the brain wrote:the actual story is true, including the injuries.I used a 15 mm pipe with a 12 mm inside diameter.Pushing down with all my weight, I could easily compress it.The volume however was tiny.
When it blew I didn't even realise it, I just heard myself screaming, like it was somebody else..
An dthen I saw the blood..
I have been a bouncer for 8 years, and in all this time nobody has ever succesfully punched me in the face.No that I've quit I nearly klill myself...how ironic


I was just being sarcastic about the blueprint part.
.
That thing was too frickin dangerous, it could have killed me, you think I'll give you blueprints??


sounds like i t hurt... alot.

and i would like plans because i want to make a high pressure pump but only like 300psi so i would use a bigger diameter pipe etc. but i haven't got a clue about the rest :lol:
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Unread postAuthor: iknowmy3tables » Tue Nov 13, 2007 5:11 pm

well sounds like the rod wasn't locked in, looks like that one must have for this, also a bumper usually a spring to cushion the top and bottom part of the strokes thats a feature on most real higher pressure pumps
and definatly don't be cheap on your check valves, I belive your check valves used free motion balls in them right, well make sure they're spring loaded check valves

I had an interesting idea about a telescoping pump locking diffrent cylinders to adjust volume but with Brian's story I wouldn't make one for pressures high

hey don't forget that you can buy bike shock pumps that can go to 500psi
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Unread postAuthor: Brian the brain » Wed Nov 14, 2007 12:04 am

The checkvalve blew..if that helps...so definately make your own, sure to withstand any kind of force...
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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: nz_cannons » Wed Nov 14, 2007 12:27 am

You can buy hand pumps for pumping up PCP air rifle cylinders.
They can go up to 4000psi some of them.
Might need to make some sort of custom fitting for connecting to a gun though.
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Unread postAuthor: Hawkeye » Wed Nov 14, 2007 6:57 am

Follow any of the instructions on here!

The key to preventing accidents is to have a small spindle check valve with an o-ring that can't be accidentally displaced into the chamber while pumping. You just want to unseat it a little and allow air to hiss past it.

The pump rod doesn't have to actually pop out of the gun totally to hurt you if the check fails. It only needs to rapidly extend.
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Unread postAuthor: iknowmy3tables » Wed Nov 14, 2007 8:03 pm

what the heck Hawkeye your comment was posted five minutes into the future wow is my clock messed up
edit: oh omg I forgot the fact that its am lol

brian can't you get a extreme presure check valve for fairly cheap, what were your checks rated to
mcmaster part: 7775K12
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Unread postAuthor: Brian the brain » Thu Nov 15, 2007 1:14 pm

Here is the basic idea.Make sure no part of the checkvalve can get blown out, because indeed, it was the rapid extension of the handle that got me.

THe idea is to use a long piece of threaded rod.Two nuts make up the piston head.You will need to "lathe"them using a bolt ( to hold them on to)
a file and a drill.
Grind them down untill they are round and snugly fit into the pipe ( I used 15 mm OD copper pipe.ID would be about 12 mm.
The bottom nut needs a leak hole or channel, to vent on the up stroke.I simply sawed a cut into it.
The top nut just needs to be flat and a nice smooth snug fit.You teflon tape the rod in the place where the top nut goes.It needs to form an airtight surface.
You place an O-ring in between the nuts.THe O-ring needs to be big enough to seal against the inside of the pipe.It should also remain free of the threaded rod.I filed the section of rod smaller in diameter, wich worked better.That enables air to pass through the center of the O-ring.
Pictures should explain what my broken English can't
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Homemade stirrup-pump.JPG
With this design I got up to 50 bar WITH one arm.I could not believe it at first.I changed the pressure gauge and retried.I got up to about 70 bar before the valve blew.
O-ringpumpseal.JPG
This should explain how the one way valve works.THe O-ring seals against the outer wall.When the rod is pushed down it creates an airtight seal against the O-ring.
In the up stroke, the nut is pulled up and off the o-ring and the airchannel opens up.Air leaks past the upper nut, through the inside of the O-ring and down through the airchannel in the bottom nut.THis is needed for the pump to take in a new volume of air each stroke.
O-ringpumpseal.JPG (37.59 KiB) Viewed 998 times
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: ALIHISGREAT » Thu Nov 15, 2007 5:59 pm

what diameter pipe do you think i could use if i was pumping to 300psi max?
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Unread postAuthor: Hawkeye » Thu Nov 15, 2007 7:36 pm

3/4 inch copper and about a 2 foot long pump body. Please read the threads on making these pumps.
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Unread postAuthor: Mitchza89 » Thu Jan 03, 2008 9:04 am

Sorry for kicking up an old thread but what gun did you use this pump for BTB? It's volume isn't too big at all so for your sawn-off I'm thinking.
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Unread postAuthor: Antonio » Sun Mar 30, 2008 8:21 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??


Sounds deadly, but I would like some blueprints:)

edit: Ah k I see ehm above:)
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