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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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Homemade high pressure pump

Unread postAuthor: SpudBlaster15 » Mon Aug 20, 2007 11:41 pm

Today my bike pump kicked the bucket, which probably had something to do with the fact that I was using it to pressurize my Coaxial BB gun to 180psi - 20psi over the pump's limit. As a result, I am looking to build a homemade high pressure pump. The plan is to use a piece of 1/2" Type L or M copper as the pump body, 1/4" steel threaded rod as the shaft, cast epoxy or hot glue as the piston, an o-ring to seal the piston, 2 check valves to control the air passage through the pump, and the hose and schrader connector from a bike pump. I plan to reach at least 300psi. Has anyone built a similar device? If so, any pointers would be greatly appreciated. To be specific, I am mostly wondering about locating and mounting the check valves.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 20, 2007 11:45 pm

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Unread postAuthor: MrCrowley » Tue Aug 21, 2007 1:18 am

On the topic of homemade spudgun devices...Do you think it would be a good idea to have a showcase section for such items?
Like a few people have made electrolysis machines, high pressure pumps, trebuchet's etc, I think we should have a showcase section for either:

1)'Spudgun related devices'(homemade pumps etc)
2)'Non-Spudgun related devices'(RC planes that you've made, motorbikes/scooters you've made etc)

The problem with the second one is you'll have a mix of non-spudgun related stuff and useful spudgun stuff like pumps and compressors.

What do you guys think?
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Unread postAuthor: mike1010 » Tue Aug 21, 2007 1:52 am

i like the idea maybe even have both
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Unread postAuthor: f.c » Tue Aug 21, 2007 3:42 am

i have already suggested the idea.
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Unread postAuthor: BC Pneumatics » Tue Aug 21, 2007 7:38 am

MrCrowley, this is not the place. Stay on topic.
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Unread postAuthor: SpudBlaster15 » Wed Aug 22, 2007 12:46 am

Ok, this is my current pump design.

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In order to save $6, I pondered using a rubber disk and a spring inside a 3/4" T fitting instead of using the store bought check valve. I am also very skeptical about the integrity of my schrader adapter connection. Any thoughts?
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Unread postAuthor: Hawkeye » Wed Aug 22, 2007 6:44 am

You are making it overly complex near the bottom. Find a way of building a tiny check valve attached to the gun rather than a commercial check valve in the pump.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 22, 2007 6:51 am

Hawkeye wrote:You are making it overly complex near the bottom. Find a way of building a tiny check valve attached to the gun rather than a commercial check valve in the pump.


That will however increase the dead space and limit the maximum pressure you could achieve.
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Unread postAuthor: Fnord » Wed Aug 22, 2007 6:52 am

Also, be sure not to leave a lot of dead space between the check valve and where the piston bottoms out. Too much will limit the pressures you can get.

Damn it jack.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 22, 2007 7:29 am

I know, I know, sorry.

SpudBlaster, you might find details of the Girandoni pump on this page useful.

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Unread postAuthor: SpudBlaster15 » Wed Aug 22, 2007 11:26 am

Hawkeye wrote:You are making it overly complex near the bottom. Find a way of building a tiny check valve attached to the gun rather than a commercial check valve in the pump.


I plan to use the pump on multiple guns, so I would rather have a check valve built into the pump rather than each individual launcher. Plus, as jackssmirkingrevenge mentioned, dead space would be increased, and I want to keep it to a minimum. The plan is to reach at least 300psi.
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Unread postAuthor: Hawkeye » Wed Aug 22, 2007 7:40 pm

What? There is no dead space at all. The piston of the pump actually touches the tiny check valve at the bottom of the pump stroke. Trust me. I made it specifically to eliminate dead space. It is exactly like the girandoni pump which also threads directly to the cylinder.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 22, 2007 10:23 pm

The dead space comments were made because it was assumed you wanted to put a check valve at the filling point of this design leaving the piping in between the bottom of the piston stroke and the check valve as dead space.
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Unread postAuthor: Hawkeye » Thu Aug 23, 2007 9:54 am

No, the intake valve is past the pump piston, output is directly from the end of the pump past the check valve of the gun. It is easier to eliminate the hose and schrader attachment.
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