clide's take on semi-auto (now with animation)

Post questions and info about pneumatic (compressed gas) powered launchers here. This includes discussion about valves, ratios, compressors, and anything else relevant to launchers powered by compressed gas.

Postby chewy » Mon Sep 20, 2004 12:31 pm

All hail the king of valves. Kudos to another work of art, you done it again. :D
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Postby clide » Mon Sep 20, 2004 3:38 pm

Thanks again guys :oops:

As far as speed, here is the speeds from a clip I shot. IIRC the clip holds 18 balls, so there was an error on two of the shots. My compressor kicks on at about 70 psi I think and it kicked on after the last shot, so shots are 100-70 psi
522.7
517.6
523.8
388.1 *
503.7
504.1
498.2
485.9
488.9
480.8
468.4
548.5 *
458.3
463.1
452.5
455.6

* marks inconsistant data that would be thrown out

Here is a diagram of the gun:
<img src="http://members.cox.net/ecyrb/slider/slider.jpg">
Hopefully you can see how it works in that.
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Postby Spudgunner86 » Mon Sep 20, 2004 3:58 pm

I'm still confused about how it works, but I have to say that is a beautiful gun! it's sweet!
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Postby OJHSPyro89 » Mon Sep 20, 2004 4:16 pm

Yea thats perdy confusing, but thats sweet. I dont get a video but i get sound and its perdy fast if i might say. Itd be even kooler if it was large bore.

All in all how much did it cost?????????

might have to take the clide design and make it lil bigger :)

EDIT: NOW i understand the concept, only thing that looks kinda wierd is the hole it leaks everytime u shoot the gun. Wouldnt it be kool to wire a switch and valve up to the resevoir so everything the trigger went back so far it would shut off the resevoir instead of dumpin the air outa the back.
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Postby bob-e » Mon Sep 20, 2004 4:56 pm

<font color="#000000">ok, tell me if i got this right
1) you fill the gun through a female quick disconnect
2) the air pushes back the rubber disk, filling the chamber
3) the rubber disk slides back into place acting like a one-way valve
4) the sliding sleeve slides back opening the holes in the slide valve body, this exhausts the pilot chamber
5) the pisto goes back letting the air out
6) the sliding valve closes and you go back to step 1

i have two more question: (1) is the one-way valve in the piston there because a small leak hole would fill too slow for a semi auto gun? (2) why did you go through the trouble of making that fancy exhaust valve, from what i can see that looks like a 1 1/2" pilot chamber, and simple blowgun should exhause that just fine</font>
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Postby kozak6 » Mon Sep 20, 2004 5:32 pm

When I try to play your video, all I get is the sound. It sure sounds bad-ass, I will give you that much.

EDIT: Spelling error
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Postby Longshot » Mon Sep 20, 2004 5:32 pm

finally someone put everything together!...That is a freaking awesome desing. Looks very well thought out and executed.
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Postby OJHSPyro89 » Mon Sep 20, 2004 6:34 pm

if i had a job.....................
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Postby clide » Mon Sep 20, 2004 10:35 pm

Thanks all

SG86: Have you figured out how normal piston valves work? I've only seen you around the combustion section, so if you're not sure how piston valves work then it would be hard to figure out what I have drawn.

OJHS: Hard to say exactly because some parts were bought in bulk (o-rings) and I went through 3 bodies and 2 pistons, but I already had most of the parts. I also had to buy a slide valve to see how that worked. I would say overall it was easily over $100, but if you bought each part on its own and made it successfully the first try then it could probably be built for less than $40, but a lot of labor of course.
<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">only thing that looks kinda wierd is the hole it leaks everytime u shoot the gun<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Not sure what you mean there. The only air not put through the barrel when you shoot the gun is the air in the pilot chamber, and that is shot out on any piston valve.

bob-e: Sounds about right.
1)yes
2)It was neccessary to make it semi-auto and not waste air. If you just used a blowgun and had the input air connected to the pilot chamber then flow of the blowgun would have to be more than the input, you would also be trying to exhaust the air as it is still rushing into the pilot chamber, wasting some air. The other option would be to fill from the chamber and put a spring behind the piston. Problems with that is air would still be flowing after you fired the gun, wasting some air out the barrel, and you would be fighting against the air coming through the EQ hole too. That is not a significant factor, but it is still something to think about. The easiest option for someone not willing to fabricate something or buy a slide valve would be to find a 3-way valve on ebay or something.

Edit: I may reencode the vid. Anyone know a common codec that has nice compression?
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Postby CountZ » Tue Sep 21, 2004 12:00 am

Amazing work clide. It makes me think that I've overengineered my semi/full auto gun that I've been gearing up to build. This has made me step back and look at my design.

Is it just my eyes deceiving me, or is that T rather long? I can't see any seams where you've joined pipe to it. Also, the 90 seems to be very long as well.

Great job again.
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