Search found 171 matches

by mako
Thu Mar 05, 2015 5:28 pm
Forum: Pneumatic Cannons
Topic: 20mm Airsoft Howitzer
Replies: 9
Views: 5619

20mm Airsoft Howitzer

Hey, guys! I just *finished* my first airgun! :o Okay, yeah, it's not my 'first' actually, but it's the first one that's been finished to operational standards, instead of just going to 'proof of concept' and no further. :( After building a small hammer valve for a project I'm working on (airsoft sh...
by mako
Thu Mar 05, 2015 11:31 am
Forum: Pneumatic Cannons
Topic: First Project - Semi-Auto
Replies: 12
Views: 4129

Re: First Project - Semi-Auto

If this is your first project, Tetra, I'd really suggest going with a hammer valve system first. The performance/efficiency might be low, but it'll teach you a lot more about how compressed gasses function. Plus, the materials will be a lot cheaper than the QEV system. However, if you're set on usin...
by mako
Wed Feb 18, 2015 11:17 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Airsoft 'vortex" M9E1-7 "flame thrower"
Replies: 6
Views: 4392

Re: Airsoft 'vortex" M9E1-7 "flame thrower"

Wow! I totally got to agree with Cammy3d. This may be one (if not 'the') best looking hand-built airsoft gun on the site! And the firepower in the video was impressive!
by mako
Tue Feb 17, 2015 10:27 am
Forum: Pneumatic Cannons
Topic: Pneumatics: Without Expensive Tools
Replies: 10
Views: 7150

Re: Pneumatics: Without Expensive Tools

Totally cool. His work on the trigger mech was beautiful.

I knew the barrel was steel, but I noticed that the dovetailed locking pieces were brass. Seems like they'd shear off under the recoil.
by mako
Mon Feb 16, 2015 3:59 pm
Forum: Pneumatic Cannons
Topic: Pneumatics: Without Expensive Tools
Replies: 10
Views: 7150

Re: Pneumatics: Without Expensive Tools

Same here, Brian!! Man, that guy was a genius with metal. Where did you find that, Gipetto?

Question: his use of brass was fairly liberal. I was under the impression that it's not a very strong metal, but it looks like he was using it in some high-stress areas...
by mako
Sat Feb 14, 2015 10:54 am
Forum: Pneumatic Cannons
Topic: Pneumatics: Without Expensive Tools
Replies: 10
Views: 7150

Re: Pneumatics: Without Expensive Tools

All very cool stuff, guys! However, I was aiming for a more "how-to" demonstration approach, so newbies can find a thread with lots of really specific information. ;) Bravootome, what do you mean by "a flex"? Technician1002, those are some scary-size airchambers! Brian... you ARE aware that you cons...
by mako
Fri Feb 13, 2015 12:40 am
Forum: Pneumatic Cannons
Topic: Pneumatics: Without Expensive Tools
Replies: 10
Views: 7150

Pneumatics: Without Expensive Tools

Hey, guys. I got my propane hammer valve working properly today!! It's the first airgun I've managed to get to the point of real functionality and I'm pretty excited. A little of the success is due to hard-headed unwillingness to give up, but most of it goes to all the guys on here who posted their ...
by mako
Thu Jan 15, 2015 3:31 pm
Forum: Pneumatic Cannons
Topic: Soldering copper fittings
Replies: 14
Views: 4701

Re: Soldering copper fittings

Interesting. Y'really do learn something new every day, don't you? ;) Hahaha. Yeah, it's more wasteful, but when you're playing an action sport like airsoft or paintball... ROF becomes VERY important, eh? I just assumed the blown-bolt would be the most easily built. I know JSR likes the pop-off type...
by mako
Thu Jan 15, 2015 12:31 pm
Forum: Pneumatic Cannons
Topic: 30 bar cigarette gun=)
Replies: 11
Views: 9928

Re: 30 bar cigarette gun=)

This is really nice work!

Out of curiosity, why a cigarette? Seems like a pen would give you more barrel length, thus equaling a higher velocity for your projectile. Plus, it would have the perfect firing mechanism... the pen's clicker.
by mako
Thu Jan 15, 2015 11:34 am
Forum: Pneumatic Cannons
Topic: Soldering copper fittings
Replies: 14
Views: 4701

Re: Soldering copper fittings

I hadn't thought of that. I didn't know copper HAS a temper. Yeah, I'm starting to see that. The planning angle can really save some swearing and money, eh? Question on hammer valves, btw. Do you know of any links to threads using hammer valves in conjunction with a reciprocating bolt to create full...
by mako
Wed Jan 14, 2015 1:25 pm
Forum: Pneumatic Cannons
Topic: Fiberglass barrels and pressure vessels.
Replies: 7
Views: 2548

Re: Fiberglass barrels and pressure vessels.

Odd. I would have thought reinforced fiberglass would make a really good barrel. That stuff is remarkably strong, especially as regards bursting. If your barrel cracked, bravootome, my guess is the fiberglass was laminated length-wise, rather than across, like matti suggested. Ichabod, if you don't ...
by mako
Tue Jan 13, 2015 5:53 pm
Forum: Pneumatic Cannons
Topic: regulator
Replies: 9
Views: 2724

Re: regulator

As vng21092 has pointed out, you need a pressure regulator, not a flow regulator. Question: why would you want a pressure regulator on an air tank? Odds are you won't be getting air to high enough pressures to need a regulator... unless you're really dropping the pressure way down, like 10's of PSI....
by mako
Mon Jan 12, 2015 4:25 pm
Forum: Pneumatic Cannons
Topic: Soldering copper fittings
Replies: 14
Views: 4701

Re: Soldering copper fittings

Okay, that's a weight of my mind, then. A small weight, but it's gone now. ;) (It's always that 'slim chance' that gets you, tho, isn't it :D) An interesting problem I've been having with this valve, by the way. The opening on the reducing joint was bigger than I wanted it to be, so I soldered a was...
by mako
Mon Jan 12, 2015 12:29 pm
Forum: Pneumatic Cannons
Topic: Soldering copper fittings
Replies: 14
Views: 4701

Re: Soldering copper fittings

Makes sense. I guess the pressurized oxygen and propane WOULD be pretty flammable, now that I think about it... Question on that, btw. I've never heard of anyone's airsoft propane catching fire, but what would you say the odds are of that happening? Assuming the amount of propane released with each ...
by mako
Sun Jan 11, 2015 11:02 pm
Forum: Pneumatic Cannons
Topic: Soldering copper fittings
Replies: 14
Views: 4701

Re: Soldering copper fittings

Ah, thanks! That's exactly what I needed to know. With airsoft, 145psi is PLENTY. Anything more and you get way too much power to be safe. ;) Purge the reservoir? I assume you mean purge it of air, so the air and propane don't mix? Thanks for the link. That's just the sort of thing Ive been trying t...