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Mitch's All Metal BB Gun

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: jackssmirkingrevenge » Mon Sep 24, 2007 11:15 pm

Is the spring really necessary btw?
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Unread postAuthor: experament-u2 » Tue Sep 25, 2007 12:58 am

i think its brilliant
excellent work i cant wait till its finished
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Unread postAuthor: rna_duelers » Tue Sep 25, 2007 1:12 am

The spring keeps the piston seated until the pressure builds behind it in the pilot area I believe jack.

I can see how your going to attach the stock easily now,I to am wondering if at say 300psi if your piston seal will hold up but you do have a few spare ones hahaha :wink: .

One time when I'm Brisbane way matey I'll bring my Chrono along and we can chrono this thing for its velocity.Sound good to you?
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Unread postAuthor: Mitchza89 » Tue Sep 25, 2007 1:15 am

Jack, I havn't tried it without the spring but I know she works perfect with it so why fix whats not broken? ;)

Thanks alot U2, She should be completed real soon. I welded up a part of the detatchable stock before.

Damn straight RNA, sounds like a sh!t hot idea. I dunno what speed it will shoot but with 6mm lead balls at 300psi, im thinking 600fps or so but even if I can get close to that, it'll put a giant smile on my face :D.

Cheers lads.
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 25, 2007 3:06 am

If I were you i'd remove the spring (and replace it with a thick rubber washer as a bumper) and see if you can still fill without it - it should increase performance on firing.
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Unread postAuthor: Mitchza89 » Tue Sep 25, 2007 3:10 am

Oh really? Wowie...How does that work? I'm guessing the piston just shoots back quicker.
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 25, 2007 3:13 am

That's it, the less resistance the piston meets moving backwards, the quicker it will move and therefore the faster your valve opens.
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Unread postAuthor: HaiThar » Fri Sep 28, 2007 3:15 pm

Where/how did you get that Shrader into that fitting?
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Unread postAuthor: Mitchza89 » Fri Sep 28, 2007 6:20 pm

Homemade mate ;) I just got a rubber tubeless tire valve, sanded it down so it was like a plug, drilled out the hole in that 1/2 brass fitting and just pushed it in. It's completely air tight at 360psi (havn't tried any further) so I'm happy.
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Unread postAuthor: Crna Legija » Mon Jul 21, 2008 3:01 am

wat is a shock pump ?
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Unread postAuthor: Mitchza89 » Mon Jul 21, 2008 3:05 am

It's a small high pressure pump. Well done on kicking up a seriously old topic :D.
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