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Aeolus's Trident- MAJOR UPDATE! 11/26/2010

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: Technician1002 » Mon Nov 29, 2010 1:48 am

When retracted fully into the nipple, does the o ring have any chance at exiting the other end of the nipple into the coupling?
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Unread postAuthor: saefroch » Mon Nov 29, 2010 11:59 am

Chance of course, but I highly doubt it actually would. It would have to almost completely deform the bumper (Which cannot be done by throwing all my weight onto a clamp), but if it did, the bounce back would shred the o-ring for sure. It's likely that the previous UHMWPE backing did deform a little and allow the o-ring to poke out the back of the nipple and shred on the way back in when I re-pressurized.

I am now going to make the piston's ghettoness factor go up by about a factor of 100 in an attempt to make it ideal, so wish me luck!
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Unread postAuthor: saefroch » Mon Nov 29, 2010 1:29 pm

Image

O-ring was not sealing correctly due to a diameter deficiency. I wrapped the section of the bolt under it in some cellulose mixed with a solution of vinyl acetate ethylene copolymer, and it's working like a real check valve now.
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Unread postAuthor: Lockednloaded » Mon Nov 29, 2010 7:37 pm

I was wondering if next time you get it open you could take a few pictures of the piston seat for me, I'm not understanding how it seals on a standard bushing :?
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Unread postAuthor: saefroch » Mon Nov 29, 2010 7:51 pm

Sure, if I can manage something that's not a big white blur. My camera hates dark shots.
EDIT: Yeah, it hates dark shots. This is the best I can do for you right now :?.
Image

And also this is the end product of today's work (I think I can, I think I can, I think I can)
Image
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Unread postAuthor: Selador » Mon Nov 29, 2010 8:08 pm

saefroch wrote:And also this is the end product of today's work (I think I can, I think I can, I think I can)


How thick is that metal ?

And what did you shoot it with ?
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Unread postAuthor: saefroch » Mon Nov 29, 2010 8:11 pm

Shot a 11/32" low-carbon steel ball at 1/16th inch weldable steel plate.
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Unread postAuthor: Lockednloaded » Mon Nov 29, 2010 8:23 pm

so you just really wrenched that fitting in?
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Unread postAuthor: saefroch » Mon Nov 29, 2010 9:43 pm

Wrenched indeed :wink:. Well actually, since the cross is type 304/304L stainless it acts as a chasing die on almost any other fitting I pick up from my local hardware store. Use it like a die; Turn it in, back it out, repeat. Clean out shavings. Repeat. Eventually it goes all the way in.
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Unread postAuthor: saefroch » Fri Apr 01, 2011 8:50 pm

New video compilation on the first page, since I finally bothered to learn how to use Windows Media Player. In the course of doing so, I made a pseudo slow-motion by fading in consecutive frames, and what it shows about the airfloat expansion is quite interesting (since the brain interpolates what's between the frames as they fade together).

Technician1002 wrote:Did it eventually turn into a vortex ring?
I think I can answer that now as a yes, but my camera isn't high-speed so the vortex ring is forming in one frame, and disintegrating in the next. Watch the video, at the very very end.
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