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| EvilFish |
 Posted: 08/14/2009 21:44 PM Post subject: Idea for a pump, mebbe??? |
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Joined: 04 Aug 2009
Posts: 45
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Hey everyone, am currently bilding a pnematic spitball cannon, (and piss off everyone in my class  ) and was thinking, that maybe i could get one of those pumps in shampoo pump things, and use it to pump up my mini. i think it might work, but can someone tell me why it would or wouldnty work??? |
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| FORE!!!! |
| Posted: 08/14/2009 21:51 PM Post subject: |
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1st Lieutenant
Joined: 06 Jul 2009
Posts: 280
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it might work but.. ,ud need some kind of check valve in place after the nozzel,for obvious reasons,
if u managed to overcome that id like to see myself what kind of pressure it could reach "give it a go" |
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| inonickname |
| Posted: 08/14/2009 21:54 PM Post subject: |
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Major General
Joined: 07 Dec 2008
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It wont work.
They do not have a perfect seal, only enough to pump thick fluids. Added to that, they are only meant to push past a few inches of gravity.
The bore and stroke is also so small that reaching pressures (respectable) would be impossible. |
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| EvilFish |
| Posted: 08/14/2009 22:00 PM Post subject: |
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Joined: 04 Aug 2009
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Crap....
then does anyone have an idea of how i could get a small easy pump?? |
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| FORE!!!! |
| Posted: 08/14/2009 22:09 PM Post subject: |
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| EvilFish |
| Posted: 08/14/2009 22:16 PM Post subject: |
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| Yes, I have, But they are too expensive. i cant find one for under 20$ and wouldnt the pump thing you linked to be too big? i need something small, as in 4-5 cm long at most. any other ideas? |
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| FORE!!!! |
| Posted: 08/14/2009 22:25 PM Post subject: |
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1st Lieutenant
Joined: 06 Jul 2009
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u cant find a basic small hand pump for under $20 can i ask where u have been looking?? if ur an aussie try rebel sport and look for a basket ball pump/ball pump ,i got one from there not long ago its about 200mm long
and the chemical/water pump id say its about 30cm long
and if ur looking for a pump 4-5 cm long let me know cause id like one |
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| EvilFish |
| Posted: 08/14/2009 22:30 PM Post subject: |
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| hehe lol! actually, i have decided to make my own. it will use some 6 mm copper tube, some small o rings i just found, epoxy and ball bearings. im also gonna have two springs in it, so rather than pumping in\out like a bike pump, it will be more like clicking a mechanicle pencil, only a bit harder. it will be (if my plan works) only 3.5 cm long! yay! |
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| inonickname |
| Posted: 08/14/2009 22:38 PM Post subject: |
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Major General
Joined: 07 Dec 2008
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| Just checking, you do understand the mechanics of how a pump works, don't you? |
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| FORE!!!! |
| Posted: 08/14/2009 22:40 PM Post subject: mini pump |
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this post is not in responce to mr nickname
yeah ive had a stab at making a pump, here she is the chamber is 100mm long except for the handle which is 100mm long as well,, its basically a water pistol i made for my brother,but anyways post some pics once ur completed
Last edited by FORE!!!! on 08/14/2009 22:43 PM; edited 1 time in total |
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| jor2daje |
| Posted: 08/14/2009 23:31 PM Post subject: |
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Lieutenant Colonel
Joined: 05 Oct 2008
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| here is a small high pressure pump i made, its pretty easy you just need to make a floating o-ring piston, then you can use a schrader valve as a check valve. |
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