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Gas strut hand pump idea

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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Gas strut hand pump idea

Unread postAuthor: zackass1 » Wed Sep 16, 2015 2:32 pm

Hi
Does any of you guys tried to use gas strut to build high pressure hand pump?
I need at least 130 bar (1900 PSI) but very small volume. So I think of 1 stage pump with small diameter piston.
I think of use gas strut because it has perfectly smooth cylinder and matched rod with piston.
I look for tips how to disassemble one of this gas springs. I don't see any sign of thread.
Is carefully cut only option to release nitrogen and open cylinder?
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Re: Gas strut hand pump idea

Unread postAuthor: jackssmirkingrevenge » Thu Sep 17, 2015 6:52 am

There was a Chinese member who had done this but for the life of me I cannot find the topic.
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Re: Gas strut hand pump idea

Unread postAuthor: wyz2285 » Thu Sep 17, 2015 7:44 pm

jackssmirkingrevenge wrote:There was a Chinese member who had done this but for the life of me I cannot find the topic.

User name was cangying I think. He reached 5MPA if I remember correctly.
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Re: Gas strut hand pump idea

Unread postAuthor: jackssmirkingrevenge » Thu Sep 17, 2015 9:32 pm

wyz2285 wrote:User name was cangying I think. He reached 5MPA if I remember correctly.


I thought that but it's not in his posts, I think we had another brief visitor with not much English skills but a lot of ingenuity.
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Re: Gas strut hand pump idea

Unread postAuthor: zackass1 » Fri Sep 18, 2015 5:15 pm

I look after cangying but I find nothing.

I drill small hole in gas strut and wait to nitrogen escape.
Next i cut with angle grinder top part of cylinder.
And when I see how its build inside I realise that I cut the wrong end of cylinder :evil: xD
In top part of cylinder is linear bearnig and I cut this part :/
Piston is useless in pump idea and shaft is shorter than cylinder.
In first look gas strut was good material for pump but after examination of parts this is not good idea.
I think cheaper and better will be buying precision pipe for cylinder and made resin piston from this topic
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Re: Gas strut hand pump idea

Unread postAuthor: ToasT » Sat Sep 19, 2015 5:22 am

There is this example from ookook.
I have been wanting to experiment with this, however I pretty much have a limitless and virtually free supply of fridge compressors and the gas strut option was pretty expensive from my initial research. (once shipping was included)
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Re: Gas strut hand pump idea

Unread postAuthor: zackass1 » Sat Sep 19, 2015 3:14 pm

Thanks for link
It look like furniture gas strut (mine was car gas strut). I must think about it one more time.
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Re: Gas strut hand pump idea

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