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Which Shock 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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Which Shock Pump?

Unread postAuthor: BeaverRat » Sat Aug 21, 2010 1:29 am

Hello,
I'm working on my high pressure cannon, and I was wondering what shock pump to buy. The pressure chamber is 10 cubic inches in volume. I would like to be able to reach 400 PSI...
Thanks
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Unread postAuthor: ilovefire » Sat Aug 21, 2010 1:32 am

im not sure what the best shock pump is but that would take HEAPS of pumping to get to 400psi, you could also build one
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Re: Which Shock Pump?

Unread postAuthor: jackssmirkingrevenge » Sat Aug 21, 2010 1:33 am

BeaverRat wrote:The pressure chamber is 10 cubic inches in volume. I would like to be able to reach 400 PSI...


Your arms will fall off before that happens, filling anything bigger than 1-2 in<sup>3</sup> to 400 psi with a shock pump is impractical at best. Get yourself a fridge compressor or build your own stirrup pump ;)
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Unread postAuthor: BeaverRat » Sat Aug 21, 2010 1:56 am

what about this though?

http://www.spudfiles.com/forums/self-co ... 21483.html

His chamber is nearly 10 cubic inches, and he uses a shock pump.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 21, 2010 2:00 am

BeaverRat wrote:His chamber is nearly 10 cubic inches, and he uses a shock pump.


Going by the data in your link:

this gun consists of a 1' long .5" copper chamber with an 11" long 5/16" barrel


... the chamber volume works out to less than 1.5 in<sup>3</sup>
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Unread postAuthor: Lockednloaded » Sat Aug 21, 2010 9:08 am

yea, the gun linked is mine and that chamber is less than 2in^3. It is relatively easy to pump to decent pressures, but If I were you I'd make sure i have a tiny chamber volume. to cut down on your own chamber size you could build a co-axial.

As far as shock pumps go, the one in the thread linked is a great pump and only cost me 20 dollars at REI. I know many members use a similar "high volume" shock pump
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Unread postAuthor: c11man » Sat Aug 21, 2010 11:38 am

i vote for a fridgy. i fill my 14 cubic in chamber to up to 700psi in under 45 seconds. i used to use a styrup pump but even that was too slow for me.
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Unread postAuthor: BeaverRat » Sat Aug 21, 2010 11:48 am

Oops, sorry. I thought his chamber was .5 x 1 foot. Where I'm from, this ' means feet and this " means inches.

I guess I will change my query... What fridge pump do I want?
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Unread postAuthor: c11man » Sat Aug 21, 2010 11:58 am

it doesnt realy matter what kind of fridgy you get, almost anykind will work
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Unread postAuthor: Lockednloaded » Sat Aug 21, 2010 1:51 pm

Oops, sorry. I thought his chamber was .5 x 1 foot. Where I'm from, this ' means feet and this " means inches.

That does mean .5 x 12 inches, but there is another pipe inside of that
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Unread postAuthor: PVC Arsenal 17 » Sat Aug 21, 2010 6:09 pm

I know very little about shock pumps but I do plan to get one for an upcoming project. This one in particular caught my eye because it has a special two-step head design which prevents air from leaking out when disconnecting the pump. This is a very useful feature for guns that aren't "self contained" like the one you've linked to. That, and it can reach 400 psi. Some can only reach 300 or 350.

$28.99 at Jenson USA.

Also, 1500th post. Look out JSR.
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Unread postAuthor: Gun Freak » Sat Aug 21, 2010 7:09 pm

Have a look at this one.
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Unread postAuthor: PVC Arsenal 17 » Sat Aug 21, 2010 8:07 pm

Thanks for that link, that appears to be the same as the one I linked to. I've read about this particular pump being sold for much less under different brand names. Beto in the UK, for example, and now XLC.
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Unread postAuthor: BeaverRat » Sat Aug 21, 2010 11:01 pm

Thanks guys, I ordered that shock pump from amazon... Now I gotta work on getting a fridge compressor. Where can I buy one for cheap?

EDIT: What is a stirrup pump, can't find much about them on google.
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 22, 2010 2:34 am

BeaverRat wrote:What is a stirrup pump, can't find much about them on google.


Check out this fantastic tutorial by Gippeto ;)
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