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Pilots for Pistons

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Secret Squirrel » Mon Nov 29, 2010 10:45 pm

I read all that, and that's the plan so far. I've learned quite a bit from my past few builds, and this piston will built with a floating O ring, using the ring as a check valve.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 29, 2010 11:37 pm

Lockednloaded wrote:JSR, link to your old thread?


I had never posted these.

Wow another vintage QDV. Did it have a sliding piston on a rod?


Looked something like this internally, unlike yours it wasn't a balanced valve:
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Unread postAuthor: c9d » Mon Dec 13, 2010 2:44 am

I used a slide valve as my pilot valve. I have a 3"x2" pilot being released by a 3/4" slide valve. I had to use a shite load of sealant on the threads to get it to seal... but it has never failed me yet.
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Unread postAuthor: Technician1002 » Mon Dec 13, 2010 1:58 pm

I made a major edit on the Wiki on pilots.

Please feel free to critique it. It may be too wordy and rambling.

http://www.spudfiles.com/spud_wiki/index.php?title=Pilot
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 13, 2010 2:08 pm

Technician1002 wrote:I made a major edit on the Wiki on pilots.

Please feel free to critique it. It may be too wordy and rambling.

http://www.spudfiles.com/spud_wiki/index.php?title=Pilot


It's well written but as with most of the wiki it is a bit too wordy. That's why I was asking about the picture uploads, a few decently made diagrams would be much more comprehensible for the average n00b than a long written piece.
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Unread postAuthor: Technician1002 » Mon Dec 13, 2010 2:12 pm

I'll hack it down to size later. I need to work on a couple page graphics for reference. I want to show the problem of too small a pilot.
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 13, 2010 2:19 pm

I can easily cook up some basic animations to show the principles at work, using colour density to illustrate gas pressure.

I was thinking of several different pistons (piston too loose, pilot too small etc.) to show the effect of the different parameters on valve performance.

As I've said elsewhere, there's a lot of talent and experience on this forum and it's a real shame that the wiki doesn't reflect it.
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Unread postAuthor: Technician1002 » Mon Dec 13, 2010 7:36 pm

Jack, That would be great. I have not done annimated graphics before. Your expertise would be most helpful. Feel free to update the page as needed. It was originally a couple of sentences long with the simple statement smaller volume is better.
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 13, 2010 11:38 pm

It'll be a way to pass the time while epoxy cures ;)
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