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piston question

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Unread postAuthor: MrCrowley » Thu Jan 10, 2008 6:00 pm

By the foot I think, you'll need to go to a Auto Shop to buy it.

Yeah it should do. They may not coil it at the Auto shop, i'm not sure.

Yeah pretty cheap.

Ah copper is made from copper :?
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 6:12 pm

oh sry i forgot a part. its supost be this: whats it made of? copper? not what copper is made of. :oops:

on another note i whant it to be atleast as powerful as a airsoft gun like the bareta. with a co-axial piston design and 1inch pvc pipe chamber how long do i need to make it so at 50 psi its as powerful as i want. the chamber i mean. sry out of the 3 comps at home ggdt works on non of them lol
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Unread postAuthor: DYI » Thu Jan 10, 2008 6:40 pm

I'm not too skilled at deciphering whatever language that is that you're typing in, but you should be able to use an efficient (~1:1 for 50 psig) C:B and get loads of power compared to an average airsoft gun. I can't GGDT it unless you give me specifics on your piston valve (pilot volume, dead space, piston mass, pilot valve, piston diameter, and porting).

And 50 psi isn't a whole lot. Most bikepumps can do 160, and even crappy compressors can do 100 or so. Double or triple the pressure and you will get better and more compact results than making the chamber larger.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 6:50 pm

i know but my parents think it'll blow up if i go higher than 50 psi which is crap but hey at least they let me build it so i'm happy cause my mom found my airsoft gun and freaked out and threw it away :cry: so now i have to build one myself, a better, more powerful one. :D

sry for my bad english i'm not from america even though i live here.

i m not asking u to ggdt it for me cause even i don't know the exact info. i'm just saying that i wouldn't bother asking if ggdt worked thats all. i just want a rough estimate i guess.

oh and what do you use for the 4.5 mm steel bbs?brake line comes in different diameters or what?
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Unread postAuthor: DYI » Thu Jan 10, 2008 8:12 pm

Measure the average OD of the BBs with a vernier caliper (if you don't have one, get one), then find some tubing on McMaster with an ID just slightly higher (like a few thousandths).

McMaster shipping is extremely fast in the States. As I live in Canada, it's a little bit harder (read: horribly convoluted and difficult operation) to order from them, and I only buy the stuff I really need.

I PMed you the rest of my post, about having your property stolen and destroyed.
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Unread postAuthor: Ragnarok » Thu Jan 10, 2008 8:44 pm

DYI wrote:McMaster shipping is extremely fast in the States. As I live in Canada, it's a little bit harder (read: horribly convoluted and difficult operation) to order from them, and I only buy the stuff I really need.

If only they had such a large website in the UK. Airlines is pretty good for components, and BES is great for copper and the related fittings, but there aren't exactly a lot (read: any) that have the sheer variety of McMaster.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 8:47 pm

um i haven't used the chat before so how do i view your message it's not poping up in the chat thing?
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Unread postAuthor: MrCrowley » Thu Jan 10, 2008 9:12 pm

It's a PM, not chat.

Look next to the link that takes you to your profile at the top of the page.

Next to each should either say you have a new private message, or you have no new messages.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 9:53 pm

ohhhh that thing ok ya i know about the messages i just didn't know that they wew referd to as PM

i'm posting a crapy diagrame of two options for a bb gun. #1 will habe more than 1 shot per tank and #2 will have an onboard pump.(the yellow thing) which is better?
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Unread postAuthor: DYI » Thu Jan 10, 2008 9:56 pm

How will the first one have more than one shot/tank? Is it just a blowgun with an oversized tank, or have I missed the mech somehow?
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 10, 2008 10:08 pm

DYI wrote:How will the first one have more than one shot/tank? Is it just a blowgun with an oversized tank


That would be good for multiple shots, especially with an airsoft or BB barrel and if your tank is large and pressurised enough.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 10:12 pm

well some where on spudfiles i read that if you squeez fast enough then only part of the air will shoot out and then you can relode and do it again maby 4 or 5 times befor you have to refill it. and yes i know each one will be weaker than the last. personaly i like option #1 better.

Edit: i got beten to the explanation lol

edit: i ment option #2 sry my bad

edit: how many decent shots would i get at50 psi of about a 2 foot length of 1 inch pvc?
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Unread postAuthor: MrCrowley » Thu Jan 10, 2008 10:50 pm

spudy buddy wrote:well some where on spudfiles i read that if you squeez fast enough then only part of the air will shoot out and then you can relode and do it again maby 4 or 5 times befor you have to refill it. and yes i know each one will be weaker than the last. personaly i like option #1 better.

Edit: i got beten to the explanation lol

edit: i ment option #2 sry my bad

edit: how many decent shots would i get at50 psi of about a 2 foot length of 1 inch pvc?


That is true, except I doubt 4 or 5 shots. Maybe 3 at the max.

As long as it's hooked up to a continous air supply, it'll be semi auto if you have a magazine or hopper for it.

At 50psi, the shots will be quite weak with a sprinkler valve and only allowing a fraction of the air through. Either build a gun with a good valve(piston) and large chamber and long barrel, or don't bother.

You're only using 50psi, you can't expect much performance from that with a sprinkler valve and a bit of air.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 11:02 pm

ya that's why i like option #2 better and it's a piston gun so it'll be fun to make. anyways with a 1inch chamber at 50 psi how long will the chamber have to be to work about as good as an airsoft gun?(option # 2) a very simple spring airsoft gun? rough estimat plz not ggdt.
or option 3 is to just use 1/2inch pvc barrel and long 1 inch chamber and make it a rifle not for airsofting? what should i do?
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Unread postAuthor: Isomer » Thu Jan 10, 2008 11:36 pm

Go for option 2:
Piston's are fun to make
It's got a cool "look"
If you've played with convential spring airsoft guns...the increase in performance should be VERY noticable...to say the least
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