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Idea for a pump, mebbe???

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Idea for a pump, mebbe???

Unread postAuthor: EvilFish » Fri Aug 14, 2009 10:44 pm

Hey everyone, am currently bilding a pnematic spitball cannon, (and piss off everyone in my class :lol: ) 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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Unread postAuthor: FORE!!!! » Fri Aug 14, 2009 10:51 pm

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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Unread postAuthor: inonickname » Fri Aug 14, 2009 10:54 pm

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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Unread postAuthor: EvilFish » Fri Aug 14, 2009 11:00 pm

Crap....
then does anyone have an idea of how i could get a small easy pump??
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Unread postAuthor: FORE!!!! » Fri Aug 14, 2009 11:09 pm

http://www.google.com/imgres?imgurl=htt ... 2&ct=image

and ever thort of using a small bike pump???
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Unread postAuthor: EvilFish » Fri Aug 14, 2009 11:16 pm

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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Unread postAuthor: FORE!!!! » Fri Aug 14, 2009 11:25 pm

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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Unread postAuthor: EvilFish » Fri Aug 14, 2009 11:30 pm

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! :lol:
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Unread postAuthor: inonickname » Fri Aug 14, 2009 11:38 pm

Just checking, you do understand the mechanics of how a pump works, don't you?
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mini pump

Unread postAuthor: FORE!!!! » Fri Aug 14, 2009 11:40 pm

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
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Unread postAuthor: jor2daje » Sat Aug 15, 2009 12:31 am

hereis 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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