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Old 08-01-2009, 09:41 PM   #1
gummybear.na20
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Default water mine!!!!!????=)

not sure if this should be in off topic , homemade or here..........
anyways i've been working on a water mine.
its suposed to shoot water when steped on
so i've came up with two ideas, (note that i came up with the idea half a minute ago)
1. check with a stick attached to the stopper thingy, so when its pushed it opens the valve, and a pressure chamber on other side with a tubeless tire schrader valve,water goes over the stopper thing in the valve ( theres this big gap that they leave)
2. two caps and conecting pipe, first cap has hole on top, put a piece of rubber with wood backing and a screw in middle( use to plug hole), second cap has schrader valve . when screw is steped on it displaces rubber plug opens hole. thats the basic concept, but u could add a return spring and guide on the top. and yes i know theres no water resevoir, i can't see a good solution other than plain pipe with silicone

thoughts, comments, concerns, ideas?
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Old 08-02-2009, 06:49 AM   #2
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Default Re: water mine!!!!!????=)

If you really want to make a water mine - something that's likely to be of limited use anyway - I'd suggest a claymore approach. Basically, a pressure chamber feeding multiple nozzles, aimed in a fan at the target area. The mine is mounted above ground, so thus must be concealed/camoflagued.

The difficult bit is figuring out how to trigger it. A tripwire won't be able to open a ball valve. You could try using a sprinkler valve, electronically. You'll need some sort of logic circuit, so that breaking the tripwire causes current to go to the valve
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Old 08-02-2009, 10:51 AM   #3
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Default Re: water mine!!!!!????=)

Quote:
Originally Posted by cantab
If you really want to make a water mine - something that's likely to be of limited use anyway - I'd suggest a claymore approach. Basically, a pressure chamber feeding multiple nozzles, aimed in a fan at the target area. The mine is mounted above ground, so thus must be concealed/camoflagued.

The difficult bit is figuring out how to trigger it. A tripwire won't be able to open a ball valve. You could try using a sprinkler valve, electronically. You'll need some sort of logic circuit, so that breaking the tripwire causes current to go to the valve


or a magnetic reed switch could be used to activate the circuit, when the trip wire pulls the magnet away from the reed it goes off.
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Old 08-02-2009, 12:28 PM   #4
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Default Re: water mine!!!!!????=)

I currently use water bottles with 2 holes drilled in them. They're really just for fun instead of being a serious attempt to get kills. (in fact, no one calls their deaths when they step on one, not even me, probably due to the very limited amount of water they dish out)
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Old 08-02-2009, 03:51 PM   #5
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Default Re: water mine!!!!!????=)

It sounds like there are two general techniques: use the weight of the foot to shoot the water, or pressurize beforehand and use the weight of the foot to trigger the burst. The former is easier to build, but the latter is obviously more powerful. Cantab and C-A 99 seem to be suggesting the former.

Gummybear, your second solution sounds effective, but you don't have to limit yourself to a single length of pipe with a tiny needle or whatnot for the trigger. Also, you can get cheap pushbutton if building one is too difficult. But a tripwire using one of Specter's reed switches would be best because it's easy to trigger over a large area. If you're familiar with electric circuits, an infrared proximity sensor or invisible tripwire is even better.

Specter, how did you hear about magnetic reed sensors? From your robotics projects?
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Old 08-02-2009, 04:24 PM   #6
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Default Re: water mine!!!!!????=)

Quote:
Originally Posted by Silence
Specter, how did you hear about magnetic reed sensors? From your robotics projects?

I think i was looking for some simple electronic circuits or something to build and different switches i could use and stumbled upon them. for example like a window alarm, if a window is pushed up and the switches dont line up a buzzer will sound.

but i think we did have reed switches in our robotics supplies as well. we just never used them
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Old 08-02-2009, 07:35 PM   #7
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Default Re: water mine!!!!!????=)

Quote:
Originally Posted by Silence
It sounds like there are two general techniques: use the weight of the foot to shoot the water, or pressurize beforehand and use the weight of the foot to trigger the burst. The former is easier to build, but the latter is obviously more powerful. Cantab and C-A 99 seem to be suggesting the former.
No, I was suggesting pre-pressurisation. Basically a multi-nozzled gun with an automatic trigger. Probably not by foot pressure either - the breaking of a tripwire can cover a larger area, as large as the mine will soak.
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Old 08-02-2009, 08:20 PM   #8
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Default Re: water mine!!!!!????=)

i've gone ahead with my second design, its seems to work great. return spring works, the thing is sealed. just waiting for pvc cement to dry and silicone to cure
its kinda like a small toy. i made it with 1 1/2 in pipe. Probly weaker than a water bottle , but still fun to play with. jsut think about these at the beach . i'd throw a decent amount of sand in the air. good thing is that this design only cost 4.20, which is a third to a fourth of the cost jsut for the check valve of the first design

but anyways, i'm probly gonna do a large claymore later, i was thinking of doing a modded sprinkler triping physicaly. the modded one shown on this site, has a blow gun thing.so loop a string tie it so thing when pulled sets of blowgun, which turns the switch. that'd be the simplest, but it'd probly not work half the time

the eletronics sounds good, but im worried about power supply and complexity,and budget
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Old 08-03-2009, 08:36 AM   #9
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Default Re: water mine!!!!!????=)

i didn't consider the fact that it takes a good amount of force to break the seal, so i didn't put a nut infront of the rubber, i did remember to but a washer and nut behind it though.
now its seals up, but the rubber staysbehind, when the bolt is pressed down( i replaced screw and wood with bolt and washer, so prototype failed

and now the question is how do i get the rubber stuff to go along with the bolt , since theres no space for a nut cause its pressed up against the top of the cap. I was thinking some sort or locking washer, what do u guys think?

Last edited by gummybear.na20 : 08-03-2009 at 08:51 AM.
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Old 06-08-2010, 04:09 PM   #10
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Default Re: water mine!!!!!????=)

(If I seem to have NO idea what this conversation is about, then you could just ignore me) You could use a few small regular washers that are crazy glued together and then krazy glue that to to the bolt. I once did something like this with a bunch of idiots with REALLY big guns, and those washers worked perfectly.

IF NONE OF THIS MAKES ANY SENSE, THEN DISREGARD IT.
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Old 06-08-2010, 04:27 PM   #11
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Default Re: water mine!!!!!????=)

The thread is months old, and they probably have moved on.
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Old 06-08-2010, 05:47 PM   #12
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Default Re: water mine!!!!!????=)

Crap. oh well, worth a try. would my suggestion work anyway?
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