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75mm Piston with 2" Porting

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: MrCrowley » Sun Oct 28, 2007 1:37 pm

Looking good, the only problem I can see is that you may have a problem piloting it, as the back half of the piston doesn't look very tight and you could lose a lot of air that will leak behind it when trying to pilot the pilot volume.

markfh11q wrote:M6 means it's rated to 6 mPa pressure, right? I'm not too buffed up on international standards at the moment.

I wish, 6mPa would mean it's rated to 60BAR which is 870PSI :P

10BAR = 145PSI = 1000kPa = 1mPa = 1,000,000Pa
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Unread postAuthor: sandman » Sun Oct 28, 2007 2:03 pm

oh noes your running vista
but nice piston valve, i like to see wood pistons


you know your piston will work better if you get a mac :P
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Unread postAuthor: spanerman » Sun Oct 28, 2007 2:04 pm

naa nothing works when u buy a mac...not even your arms
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Unread postAuthor: sandman » Sun Oct 28, 2007 2:10 pm

then i should be completly paralized as i have 4 macs

soon to be 5 :D

but once was 6 :cry:
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Unread postAuthor: MaxuS » Sun Oct 28, 2007 2:24 pm

Vista is crap, i wish i stuck with Xp.

@MrCrowley - It is a good tight fit at the back because the back of the wooden piston's edge is curved and so sits very well in the pilot/fill spigot and the yellow crap (whatever it is) sits nice and snugly and forms a great fit inside the entrance to the spigot, so i wont be venting the chamber volume.
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Unread postAuthor: mark.f » Sun Oct 28, 2007 4:04 pm

@MrCrowley and Gepard:
I'm talking about the tensile stress the connector can handle. I guess when I said "pressure" it was a misnomer.

MaxuS, what company did you get your computer from and what version of Vista did you get with it?

HP with Vista Premium and I haven't had a problem. It even lets me run OpenSource programs! :P
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Unread postAuthor: MaxuS » Sun Oct 28, 2007 4:16 pm

I have Vista Home Premium and its from Compaq, some programs like Excel and Calculator dont work, they never have. And the DWM takes up like 30% processor memory!! Sodding ridiculous.
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Unread postAuthor: jrrdw » Sun Oct 28, 2007 4:20 pm

veginator wrote:Thats what he is saying that it will swell to the pipe size and get it self stuck in there.And let me tell you having to service it with all the pressure inside wouldn't be fun.


Yea, i know what he ment. Looks like he used 2 pieces of plywood. Different then mine, lighter.

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Unread postAuthor: MaxuS » Sun Oct 28, 2007 4:42 pm

Yeah, I made mine into two faces to make it much lighter, it'll slide with the greatest of ease now, while still retaining a perfect fit. It'll seal even if I blow through the chamber port.
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Unread postAuthor: mtronic » Mon Oct 29, 2007 3:57 am

wow, very nice mate :) I was trying to build one out of wood but gave up because I couldn't get the lengths right :(

Your piston has inspired me :D
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Unread postAuthor: MaxuS » Mon Oct 29, 2007 11:16 am

Thanks :D

If you use two pieces of wood with a bolt in between, you can adjust the distance between them and so make the piston longer or shorter.
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Unread postAuthor: mtronic » Mon Oct 29, 2007 6:44 pm

Thanks :) my problem was the width of the peices I was useing. I'll go back to the drawing board when I finish my new cannon that I'm working on. Thanks for the tip.
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