How-To: Make a pneumatic cannon with a 2" piston valve.
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oh lol sorry i couldnt see it on the top down view or vid
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I was going with a 2.5 in. barrel until recectly, so a ball/piston valve would be too restreicive. I'm not saying I'm a noob though. Will a golf ball fit in a .75in barrel?spudgunnerwryyyyy wrote:This is a great tutorial. I suggest omgimonfrie2 should start simple when he has gained enough knowledge then build a piston valve. It is a great learning process my friend.
2.5" barrel would be bad as it is rare unless bought online, and fittings are also rare.
A golfball will fit in 1.5" SDR-21 if you are American, or 40mm PN18 PVC if you are Aussie/NZ etc
A golfball will fit in 1.5" SDR-21 if you are American, or 40mm PN18 PVC if you are Aussie/NZ etc
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Well I did find a 2.5in barrel to day, forgot to look for fittings though. A golf ball fill not fit in a 1.5in barrel, I curently use one and they do not fit. What does SDR-21 and PN18 mean? I never can read the pipe much less understand it. As far as my knowledge goes pressure rated is pressure rated. And thanks for all the help.MrCrowley wrote:2.5" barrel would be bad as it is rare unless bought online, and fittings are also rare.
A golfball will fit in 1.5" SDR-21 if you are American, or 40mm PN18 PVC if you are Aussie/NZ etc
SDR 21 pipe has thinner walls, and GBs will fit in 1.5" SDR 21 quite well.
As far as reading the pipe, it is a good idea. Pressure rated is pressure rated, but if it's only rated for 15 psi and you use it at 150psi, you may have a problem.
As far as reading the pipe, it is a good idea. Pressure rated is pressure rated, but if it's only rated for 15 psi and you use it at 150psi, you may have a problem.
Last edited by DYI on Sat Oct 13, 2007 10:06 pm, edited 1 time in total.
Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
Thanks for explaning that DYI.
omgimonfire please search in the future, search and you shall find.
Read this, it's a sticky so if you had looked you should've found it.
http://www.spudfiles.com/forums/viewtop ... tml#117669
omgimonfire please search in the future, search and you shall find.
Read this, it's a sticky so if you had looked you should've found it.
http://www.spudfiles.com/forums/viewtop ... tml#117669
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- Private 2
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Well it is possilbe that I am not using SDR 21, and I'll start looking for my own answers.
EDIT: I looked and did not find. Is super glue an okay solvent for brass piping? I just bought parts for a marshmellow sniper.
EDIT: I looked and did not find. Is super glue an okay solvent for brass piping? I just bought parts for a marshmellow sniper.
What?
I just gave you the answer, probably the only answer and most practical (aside from metal pipes and making your own barrel)
Super glue may be fine for a marshmellow gun but nothing involving anything over 5psi.
I just gave you the answer, probably the only answer and most practical (aside from metal pipes and making your own barrel)
Super glue may be fine for a marshmellow gun but nothing involving anything over 5psi.
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- Private 4
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lol my pipe doesnt seem to have a rating or is the pn-18 a pressure rating if so could someone link me wiht a page of what the pressure is?
cheers Nato
cheers Nato
Where do you live? What does the pipe say?
Tell me everything that is written on the pipe.
Tell me everything that is written on the pipe.
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hr products
as1477.2 pn18
20mm pvc
cat 10
hr-p01020
barcode 0314538015247
as1477.2 pn18
20mm pvc
cat 10
hr-p01020
barcode 0314538015247
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- Private 4
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could you please xplain that formula?
PN stands for Pressure Number
DN stands for Diameter Number
PN18 means 18 BAR
1BAR = 14.5psi
18BAR x 14.5 = 261psi
10BAR = 145psi = 1mPa = 1000kPa
DN20 means Diameter = 20mm(nominal diameter)
So I take it you don't live in America then
DN stands for Diameter Number
PN18 means 18 BAR
1BAR = 14.5psi
18BAR x 14.5 = 261psi
10BAR = 145psi = 1mPa = 1000kPa
DN20 means Diameter = 20mm(nominal diameter)
So I take it you don't live in America then

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abviously cheers for the help
Nato

Nato