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Homemade high pressure 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: FeLeX » Mon Aug 27, 2007 9:17 am

Oh I see. So the smaller the pump the higher pressures you can reach?
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Unread postAuthor: joannaardway » Mon Aug 27, 2007 4:11 pm

FeLeX wrote:Oh I see. So the smaller the pump the higher pressures you can reach?

In terms of diameter, yes. A good counter for the reduced volume from this is increasing stroke length.
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Unread postAuthor: FeLeX » Mon Aug 27, 2007 9:20 pm

Dang and do these really go up to 300 psi?
They don't seem that hard to make. I think im gonna give it a try this weekend. Should I use copper pipe as the "chamber" of the pump or would sch 80 pipe work too??
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Unread postAuthor: Hawkeye » Mon Aug 27, 2007 9:37 pm

I regularly take mine to 350 but you don't need to take it that high unless you are using a small chamber. I use that pressure for a .25 calibre pistol.
You should use copper as it is easier to assemble and find washers that will fit as a piston. Also it is smooth inside so the piston has less friction yet still seals well.
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Unread postAuthor: FeLeX » Mon Aug 27, 2007 9:57 pm

Ok thanks guys. I was going to replicate BTBs Pirate Pistol and I was wondering what the heck I could pump it with. I guess I am going to make one this weekend then.
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Unread postAuthor: Marco321 » Thu Oct 25, 2007 1:41 am

Sorry to kick up a dead topic, but this is relevant...

I'm going to make one of these for my up-coming copper gun. I understand the whole concept of how it works except for the piston. How is it made so it lets air in but prevents it from going out? I looked at the diagram but i can't figure it out. Any help would be appreciated.
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Unread postAuthor: SpudBlaster15 » Thu Oct 25, 2007 1:50 am

The o-ring fits loosely between 2 washers. The lower washer has deep grooves cut out of it. On the downward stroke, the o-ring (which is a tight fit in the copper pipe) is forced against the upper washer, where it seals. On the upward stroke, the o-ring is forced against the lower washer, and due to the grooves cut into it, air is allowed to move past the o-ring and into the pump cylinder.
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Unread postAuthor: Marco321 » Thu Oct 25, 2007 2:46 am

SpudBlaster15 wrote:The o-ring fits loosely between 2 washers. The lower washer has deep grooves cut out of it. On the downward stroke, the o-ring (which is a tight fit in the copper pipe) is forced against the upper washer, where it seals. On the upward stroke, the o-ring is forced against the lower washer, and due to the grooves cut into it, air is allowed to move past the o-ring and into the pump cylinder.


Thanks, it makes sense now.
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