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High PSI internals?

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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Unread postAuthor: Gun Freak » Sun Oct 23, 2011 9:57 pm

Ohh... Complex.
Why not use a 3 way solenoid valve as the pilot then? If I'd have known you were using a circuit board from the beginning I would have suggested a solenoid valve. That should make it cheaper, simpler, and less fiddly to get working.
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Unread postAuthor: Ocheeboy11 » Mon Oct 24, 2011 12:02 am

My bad, Thought i mentioned that. Well, the only issue that I see with that is the PSI, and the price. From the valves mentioned earlier, it seemed that PSi costs cash that I dont have :lol:

And just as additional information, this hopefully is gonna be mounted in a milled aluminium housing, and hopefully finished off with type III anodization, Mil-spec :D
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Unread postAuthor: Gun Freak » Mon Oct 24, 2011 6:01 am

Ohh sorry I forgot about the pressure part. My bad. Ok... Actuated slide valve it is.
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Unread postAuthor: Ocheeboy11 » Mon Oct 24, 2011 6:53 am

Either way, this projects gonna be interesting to say the least. I have the resources, now lets see if i have the skill.

What do u think of a high pressure version of the DCV in the How- to section http://www.spudfiles.com/forums/diy-3-2 ... html.would reaching 500 be possible if I milled this?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 24, 2011 7:02 am

Ocheeboy11 wrote:would reaching 500 be possible if I milled this?


I would be confident taking it to 1000 psi without fear of it blowing up. Then again, my safety record is not exactly commendable (though I see have my eyesight and all my fingers - for now) but in this case if you use reasonable quality metal components it should hold well.

MRR's design uses standard parts and turning down the spool on a lathe should be a piece of cake.
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Unread postAuthor: POLAND_SPUD » Mon Oct 24, 2011 9:32 am

would reaching 500 be possible if I milled this?
Not sure if I should say this, as you're already pretty confused, but if I were you I'd get a solenoid valve... a new one is going to be a bit pricey but you WILL find one on ebay - it's just a matter of time


Ignore JSR... he just got a lathe and he gets an bo*** whenever he heards the word milling/machining, lathe etc. :D

....says the guy who loves 3 ways... err 3 way valves
:D
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Unread postAuthor: Ocheeboy11 » Mon Oct 24, 2011 10:32 am

Do you think that it's worth taking the risk to lathe the valve I posted earlier? It would look great on the write up, and in my teachers eyes. Additionally, it would be easier to obtain, and cheaper too. Might as well seeing as I'm milling the whole furniture set
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Unread postAuthor: wyz2285 » Mon Oct 24, 2011 10:34 am

what you are trying to do is very complex, do you have a basic design of everything together in a diagram? because from what I read so far you don´t seen to have a basic idea about how are you going to build it :roll: 3-way and slide valve are not exactly the same to the design of a gun
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: POLAND_SPUD » Mon Oct 24, 2011 11:20 am

Do you think that it's worth taking the risk to lathe the valve I posted earlier? It would look great on the write up, and in my teachers eyes. Additionally, it would be easier to obtain, and cheaper too. Might as well seeing as I'm milling the whole furniture set

IDK but I don't think it is practical to machine a valve. Seriously there is a reason why engineers use ready made valves rather than machine them. If your design requires a special valve that has to be machined then hey - do it. But I don't think this is the case

I'd say that being able to choose the right valve for the job is as impressive as machining one - it shows you know your stuff and don't reinvent the wheel when it is not needed.

Plus using off the shelf parts shows how thoughtful you are - if a custom made component breaks down the end user is f##### up. If the part that breaks down is a 'standard' part it can be replaced

( yes you can write this sentence down and use in the future )
:D


3-way and slide valve are not exactly the same to the design of a gun

technically a slide check valve is a 3 way valve :D



Seriously I think this project is pretty complex and impressive as it is. Designing & machining your own DCV will make it even more complex. I don't think you really need more than 250 - 300 psi

Though as I said earlier - solenoid valves rated higher than that are as not as rare as you think they are. The only problem is to get them cheap (i.e. find them on ebay)
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Unread postAuthor: wyz2285 » Mon Oct 24, 2011 11:34 am

Normally a 3-way the exhaust port can be used(in this case a blow forward/back for reload), a silde valve it can't be connected.
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Unread postAuthor: POLAND_SPUD » Mon Oct 24, 2011 12:36 pm

Normally a 3-way the exhaust port can be used(in this case a blow forward/back for reload), a silde valve it can't be connected
well, yes but that doesn't mean that a slide check valve is not a 3 way valve

There are many 3 way valves that don't have three threaded ports [/code]
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Unread postAuthor: wyz2285 » Mon Oct 24, 2011 1:01 pm

There are many 3 way valves that don't have three threaded ports

I know, but most of them have :D
ok silde=3-way, I agree
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gun Freak » Mon Oct 24, 2011 1:17 pm

I agree with Poland, plus if you use the solenoid, it will be directly controlled by the electronics. If you use a manual three way, you need at least two more parts to control it. The less parts, the better.
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Unread postAuthor: wyz2285 » Mon Oct 24, 2011 1:25 pm

Or everybody here are geniuses with electronics or I´m really stupid? I´m stuck with my soleniod hammer circuit :roll:
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gun Freak » Mon Oct 24, 2011 1:27 pm

wyz2285 wrote:Is everybody here geniuses with electronics or I´m really stupid? I´m stuck with my soleniod hammer circuit :roll:

I feel the same way :roll: :D
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