Search found 46 matches

by Slauma
Tue Mar 02, 2010 8:03 pm
Forum: Pneumatic Cannons
Topic: QEV Cascade
Replies: 13
Views: 3286

I wish I had my camera so I could upload a video. I use the 3/4" QEV to pilot a 2" piston valve (PVC tee). The blowgun is not enough to pilot it with a 3/4"x1/4" adapter connected to a 1/4" tee with the blowgun on one side and a schrader on the other. Do you think this could happen because of lower ...
by Slauma
Tue Mar 02, 2010 11:44 am
Forum: Pneumatic Cannons
Topic: QEV Cascade
Replies: 13
Views: 3286

What I was saying is that this example: Large volume > 3/4" QEV > 3/8" QEV > 1/8" QEV > Small(Flow restricted) would not be significantly more powerful than: Large volume > 3/4" QEV > blowgun I understand that this wouldn't allow for any performance increase. I've never actually been able to pilot ...
by Slauma
Mon Mar 01, 2010 6:38 pm
Forum: Pneumatic Cannons
Topic: QEV Cascade
Replies: 13
Views: 3286

If the flow is limited, then a slight difference in valve speed isn't really going to make much of a difference in the valve being piloted. A 1" pilot opened at the same speed as a 1/2" pilot will dump air 4 times faster than the smaller valve. You might be able to improve the opening time on the 1...
by Slauma
Mon Mar 01, 2010 4:48 pm
Forum: Pneumatic Cannons
Topic: QEV Cascade
Replies: 13
Views: 3286

QEV Cascade

Anyone ever tried cascading 2 or 3 QEVs in a series? It seems to me like it would be useful for piloting a large area with a very small (or slow) valve. I know that using a setup like this would not allow the final pilot volume to be exhausted any faster than with a single properly piloted QEV. So t...
by Slauma
Tue Feb 16, 2010 11:20 pm
Forum: Ammo & Parts
Topic: Steel pipe questions
Replies: 32
Views: 6632

If a weld is done is it possible to re-temper the entire piece? If you bring it to the right temperature and hold it there it will anneal right? How hard would that be to do?
by Slauma
Sat Jan 23, 2010 2:48 pm
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

But hey man, seriously, I just want to let you know I'm not tryin to rip-off your cannon or anything. I didn't meant to make it sound like that. This cannon (if it ever even gets built) isn't anything like yours. I have to give you huge props on your cannon though, I could only wish to have a "knock...
by Slauma
Sat Jan 23, 2010 2:31 pm
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

@velocity3x I never would have expected this type of reaction from you. Firstly, I haven't used anything from you other than the idea of machining a valve (out of aluminum or HDPE). And even this part of my design I attributed to you in my very first sentence of my post. Secondly, this is just a bas...
by Slauma
Fri Jan 22, 2010 5:30 pm
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

Something like this. Anybody know how to thread things in SketchUp?

Image

I've attached the SketchUp file also. The forum wouldn't allow the .skp extension so I just changed it. Change it back to .skp and it should work.
by Slauma
Thu Jan 21, 2010 1:00 pm
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

I'm in no hurry, it's very unlikely anything with materialize out of this any time soon. I'm not looking for a quick answer to ease any fears, simply looking for answers, or at least some insight, to a question that I'm neither knowledgeable or experienced enough to answer myself. I understand that ...
by Slauma
Thu Jan 21, 2010 12:13 am
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

Sorry, edited too late. Let's say we're talking about a 4" x 4" block with a 2.5" diameter hole. Is that any better or still not specific enough?

edit: I guess I could rephrase my question. Would 1/4" be safe for almost any aluminum? Or is this overestimating the strength of aluminum?
by Slauma
Thu Jan 21, 2010 12:02 am
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

If I were to have a valve body machined out of aluminum (6061) what's the minimum thickness that any of the walls should have for operating up to like 700-800psi?
by Slauma
Wed Jan 20, 2010 12:10 pm
Forum: Combustion Cannons
Topic: My First Combustion (more or less)
Replies: 19
Views: 10306

Nice gun.

Where'd you get the big hose clamps to hold it together? I've wanted to use them for the same thing but I could never find them.
by Slauma
Tue Jan 19, 2010 12:38 am
Forum: Ammo & Parts
Topic: Valve Body Material
Replies: 14
Views: 2982

Valve Body Material

I'm looking to do something like velocity3x did with his 44mm Hungus and have the valve body custom machined out of something. It seems aluminum is a good material to use for something like I want (150-200 psi pressure range and ability to secure load bearing screws in it to connect the barrel and a...
by Slauma
Sun Dec 20, 2009 4:22 pm
Forum: Pneumatic Cannons
Topic: Reincarnation - 2" PVC piston valve
Replies: 9
Views: 3923

Ideally I'd have the valve housing made out of aluminum, and all metal parts and connectors. But that's not going to happen.

I used 1.25" pvc pipe couplings connected with 1.25" pipe with o-rings in between.
by Slauma
Sun Dec 20, 2009 3:10 pm
Forum: Pneumatic Cannons
Topic: Reincarnation - 2" PVC piston valve
Replies: 9
Views: 3923

Thanks Gippeto. Yes, you're correct about the reducer being DWV. I know it's no excuse, but it's the only thing I could find for what I needed. I was iffy as to whether I should use it or not, but I feel safe (whether I really am or not) using it as long as I don't take the pressure up too high. The...