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Portable Semi Auto

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 07, 2012 8:48 am

palanit wrote:The hpa tank says paintball users get over 500 shots per tank. But if it is releasing over 500 psi per shot, it seems like you would only get 6 shots or so. Is there something I am not getting?


http://en.wikipedia.org/wiki/Boyle%27s_law

Imagine you have a 48 cubic inch paintball tank.

If it's pressurised to 3000 psi, but the regulator is set to 500 psi, then it's just like having a (3000 / 500) x 48 = 288 cubic inch tank at 500 psi.
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Unread postAuthor: palanit » Sun Jul 08, 2012 11:49 pm

I want to get the clippard sm-3-3 air cylinder. However the rear mount on this cylinder is a 10-32. Does anyone know where to get an adapter for this (metal adapter not pvc) to fit onto any standard pipe size. Also it says the bore size is 5/32, which would fit in a .18" barrel, but a #10-32 thread is slightly larger than .18. AP would it fit in my barrel or not.
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 08, 2012 11:54 pm

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Unread postAuthor: palanit » Wed Jul 11, 2012 4:58 pm

I just bought a clippard sm-3-3t air cylinder. I was hoping I would be able to stick a magnet on the end of it, so it would keep ky bbs from falling out. However, it turned out that it was aluminum and therefore not magnetic. I tried to drill a hole in the magnet, but that didn't work at all and made the magnet very weak. Does anyone have any suggestions. I don't have to put a magnet there, but that was the only way I could think of that would hold the bbs in place. The air cylinder has a threaded #0-80 rod (which is like .6 inches). Does anyone have any suggestions on how to connect a magnet to the air cylinder (my barrel is .18") or have any other suggestions on how to keep the bb from falling out when you shoot down.
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Unread postAuthor: sagthegreat » Wed Jul 11, 2012 5:00 pm

EPOXY the magnet
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Unread postAuthor: palanit » Wed Jul 11, 2012 5:03 pm

I thought of using epoxy, but I wasn't sure about how it would hold up with pressure over 500 psi
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Unread postAuthor: dewey-1 » Wed Jul 11, 2012 5:29 pm

I think you mean .0625 inches not .60!



http://www.clippard.com/catalog/Page%20081.pdf
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Unread postAuthor: palanit » Wed Jul 11, 2012 7:54 pm

Sorry that's what I meant dewey
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Unread postAuthor: Crna Legija » Thu Jul 12, 2012 1:29 am

palanit wrote:I thought of using epoxy, but I wasn't sure about how it would hold up with pressure over 500 psi


JSR gonna cry if he sees that, if you rough up both the magnet and rod let it cure for a FULL 24hr it will stick.
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Unread postAuthor: sagthegreat » Thu Jul 12, 2012 8:30 am

Look at the rating of the epoxy that you are using, the locate brand ones are rated up to 2500psi
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Unread postAuthor: palanit » Thu Jul 12, 2012 12:34 pm

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290703246567&_trksid=p2992.m753
can anyone tell me if this 3 way valve is normally open or closed
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Unread postAuthor: Goats spudz » Thu Jul 12, 2012 1:07 pm

sagthegreat wrote:Look at the rating of the epoxy that you are using, the locate brand ones are rated up to 2500psi
That is Probably shear strength not pressure rating, the pressure rating entirely depends on the materials you are bonding and the thickness of the joint.
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Unread postAuthor: POLAND_SPUD » Thu Jul 12, 2012 3:14 pm

it's a universal valve (both nc and no)
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Unread postAuthor: palanit » Thu Jul 12, 2012 3:16 pm

So would it work
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Unread postAuthor: POLAND_SPUD » Thu Jul 12, 2012 3:24 pm

yeah it has 3 ports so I concluded that it must be a universal valve - most NC only valves have just two threaded ports and a third one that's just a vent hole
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