Soda bottle or PVC?

[Ragnarok]

But, normally, PVC explodes at 100 psi... right?

No, not at all. The pressures at which things fail depend on so many factors, material, shape, construction - there is no generalisation for these things.

1" PVC, assuming it's rated, should handle 150 psi.

[starman]

Well, I still don't know what to use, I think, or to use
the 1.75L plastic bottle, or to use a 40cm 1" PVC PIPE (as a chamber)

And, should I use 3/4" valve and barrel, Or 1/2" valve and barrel?

Forget about using a soda bottle for your chamber!! You've come here for advice and Rag is gently trying to push you away from an irresponsible chamber choice to a responsible one.

Properly cement the PVC and use pressure rated parts and you'll be good to go.

[elad311]

Thank you, but, my pump isn't so good, It doesn't have
a pressure gauge, should I put one in my spud gun?

[FishBoy]

i would suggest you read this- http://www.spudfiles.com/spud_wiki/inde ... _Rated_PVC

edit- yes, you definitely should put one on your gun

[starman]

Thank you, but, my pump isn't so good, It doesn't have
a pressure gauge, should I put one in my spud gun?

To repeat Fishboy, yes, pressure gage is a requirement. As much as knowing how much pressure you're putting in, knowing you have a charged chamber or not is an extremely valuable safety feature.

BTW, load you're projectile first, before charging your chamber.

[elad311]

These are my plans for the gun:
(I'm gonna take it up to 100 psi, I hope it won't explode!)

Tell me if it looks good!

[Ragnarok]

That will work, although a better valve choice would be a 3/4" sprinkler valve if you can find it - even an electrically operated one, although not ideal*, will provide a lot heap power than a ball valve, but not be hugely more complex to set up.

Eventually you'll be grateful you did, it'll be more worth keeping.

*In an ideal world, you'd mod it for blowgun operation, but not everyone wants to do that.

[elad311]

That will work, although a better valve choice would be a 3/4" sprinkler valve if you can find it - even an electrically operated one, although not ideal*, will provide a lot heap power than a ball valve, but not be hugely more complex to set up.

Eventually you'll be grateful you did, it'll be more worth keeping.

*In an ideal world, you'd mod it for blowgun operation, but not everyone wants to do that.

Thank you, I hope I'll find a 3/4" sprinkler!

[starman]

It won't explode.

This should work fine. You could get by with 35 cm of tank if you wanted. That would still give you a 2:1 c:b ratio and would be plenty for marble shooting.

Also, the pressure gage on the end is not recommended. One of the first things you'll want to do is stand the gun up on its butt....goodbye gage. You could build a tee configuration with your schrader and include your gage there...just cap off the back.

[elad311]

Also, the pressure gage on the end is not recommended. One of the first things you'll want to do is stand gun up on its butt....goodbye gage. You could build a tee configuration with your schrader and include your gage there...just cap off the back.

so, Should I screw a regular cap in the end, and put the gauge near the schrader?

[ckman]

use pvc looks cleaner and I think it is less likely to blow up and I think it is also eaiser to put the shrader valve in

[ckman]

use pvc looks cleaner and I think it is less likely to blow up and I think it is also eaiser to put the shrader valve in and no if you put pressure rated pvc it shouldn't blow up but it might at like 170-200 maybe

[starman]

Also, the pressure gage on the end is not recommended. One of the first things you'll want to do is stand gun up on its butt....goodbye gage. You could build a tee configuration with your schrader and include your gage there...just cap off the back.

so, Should I screw a regular cap in the end, and put the gauge near the schrader?

Or just a cemented cap. Tap one 1/4" NPT hole where you show the schrader and install a tee through 2 layers of PVC. On one connection of the tee install the schrader, the other install the pressure gage.

[Hydra]

If you want, you can make that T come out more with a little bit of pipe to make a small stock.
Make it so the end of the chamber looks like a w. The schrader and gauge are both pointing forwards (on the side of the T) and the long, bottom part of the T has nothing on it (except some end caps) so you can use it as a stock.

[elad311]

can you draw it for me?
I didn't understand..