My first Pneumatic

[jerry_sawyer74]

My first attempt at air
Let me know what you think...
I use it at 110 psi and it rocks...

[Killjoy]

Interesting, usually don't see the combination pvc, metal pipe like that, but i like it.
Good job.

PS
some more specs would be good, like barrel length, chamber size, range, damage, etc.

[jackssmirkingrevenge]

I'm guessing you're missing a barrel in these photos? And judging by the launch angle, this seems to be made for lobbing substantial objects over relatively larget distances...

[Pete Zaria]

It looks like you used all NSF-PW fittings (right?) so nice job there.

Two small complaints:
There's a lot of restriction and dead space between the chambers and valve. Using larger diameter pipe for the elbows and T leading to the valve, or less length of it, would open up the airflow a lot.
You don't have a pressure gauge. I think a pressure gauge is a requirement for any pneumatic (otherwise you can't tell when its charged or not without firing it). If not, at the very least, a safety pop-off valve so the chamber can't be overfilled would be a good idea.

Nice job on the modded sprinkler valve and overall design. Looks like you did your research. Overall, great job for a first pneumatic.

What size and length pipe do you use for your barrel?

Peace,
Pete Zaria.

[jackssmirkingrevenge]

There's a lot of restriction and dead space between the chambers and valve. Using larger diameter pipe for the elbows and T leading to the valve, or less length of it, would open up the airflow a lot.

Considering the restriction caused by the tiny valve relative to the barrel, I doubt this alone would improve matters unless the valve was upgraded.

You don't have a pressure gauge. I think a pressure gauge is a requirement for any pneumatic (otherwise you can't tell when its charged or not without firing it). If not, at the very least, a safety pop-off valve so the chamber can't be overfilled would be a good idea.

I've never had a gauge of any of my launchers - if in doubt, you can always hook it up to whatever you used for filling (pump, compressor attachment etc.) and check the pressure on the instrument's gauge. The only exception would be if you're using a gaugeless pump like most compact bike pumps.

[Pete Zaria]

@jackssmirkingrevenge,

OK, you're probably right. I doubt the 1" pipe constricts the flow any more than the valve does, but if you ever upgraded the valve, this would become the bottleneck. Also, bigger elbows and Ts can never really hurt.... heh....

I still think a pressure gauge is a good idea. It aids in filling (more consistent, allows you to know how much air you've put in) and also lets you know if the gun is charged or not at any given time. Unless you're ONLY going to use the gun with a compressor that has a gauge, I'd suggest one.

Off topic, but two things:
1) How did you get to 700 posts on this site without building a pneumatic before? lol. Pneumatics are fun for the reliability, ease of use, and power, but my metered propane gun sees more use because of its portability and because I don't have to fire up the compressor to use it.
On the other hand, the only pneumatic I have ATM is a non-modded sprinkler valve gun with some DWV parts I made a few years ago. I've been meaning to build a piston gun so I'd love pneumatics again....
2) I love Fightclub, too. On my top 5 movies list anyway. Awesome sig.

Peace,
Pete Zaria.

[jackssmirkingrevenge]

1) How did you get to 700 posts on this site without building a pneumatic before? lol. Pneumatics are fun for the reliability, ease of use, and power, but my metered propane gun sees more use because of its portability and because I don't have to fire up the compressor to use it.

Actually I only ever made a couple of combustions, most of my projects are pneumatic:

http://www.spudfiles.com/forums/3-4-exh ... t7173.html

http://www.spudfiles.com/forums/the-bea ... t7457.html

http://www.spudfiles.com/forums/pneumat ... t7858.html

I only use a compressor or a pump with a gauge so never felt the need to put a gauge on any of my creations.

I love Fightclub, too. On my top 5 movies list anyway. Awesome sig

Me too (O RLY? hehe) one of the most quotable movies ever, can't get enough of it

[Pete Zaria]

Oh, I see. I had assumed you meant this was your first pneumatic gun and you just built it. I should have remembered seeing your other guns around here. I loved your pen gun. Great engineering and amazing small-parts work there, lol.

Know these?
H.L.: "I do wish we could chat longer, but I'm having an old friend for dinner."
"Tonight, you pukes will sleep with your rifles. You will give your rifle a girl's name, because this is the only p***y you people are going to get."
"My name is Indigio Montoya, you killed my father, prepare to die."

Peace,
Pete Zaria.

[jackssmirkingrevenge]

silence of the lambs, fullmetaljacket and the princess bride anyway, a bit off topic hehe

[jerry_sawyer74]

It has a few barrels i have the trusty 2in by 5ft for potatos and a 4 in by 2 ft for tp. I originaly made this for toilet paper launcher so wsnt looking for range but i was supprised it blows a pot around 150 to 200 yards....i put one through a 1/2 in ply last week and thats at 110 psi. It is fully adjustable from straight up to straight forward. My chambers are 3in by 3ft, i didnt know much about cannons when i put it together and used 3/4 in piping...wnt be that for long.i want to make a piston but i dont understand it yet so i will research more b4.It is all nsf-pw and i use it with a compressor thathas an air reg. on it, only ever set to 110 max. i am going to install pop off , Like the thread says it is my 1st air launcher , but good looking out.