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For The Aussie Spudder! - Extreme Poly Pipe

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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For The Aussie Spudder! - Extreme Poly Pipe

Unread postAuthor: Mitchza89 » Sat Jun 21, 2008 6:57 am

G'day,

I'm currently making a new co-axial bb repeater at the moment. I needed to come up with something very strong, threaded, smooth and very cheap to use as the outside chamber pipe.

I came up with this. I simply bought a meter of 25mm aluminium tube, and 60cm of 25mm poly pipe. What I found astounding was the tube fitted absolutely perfectly inside the poly. It was a perfectly tight fit. Almost too perfect...

I'm planning on making this a repeater by having a pop off valve with a very strong spring installed in it behind the piston, I've got a machined hardwood piston that's a perfect fit and I plan on putting a spring behind that. I'll also stick a spring behind the trigger lever mechanism, which should hopefully add a bit more force into closing the pop off valve and resealing it all quickly. I plan on going up to 400psi, and with using a 6mm airsoft barrel, I should be able to get quite a few high powered shots.

Tell us what ya think.
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Perfectly smoothe
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The added aluminium tube. It should strengthen the hell out of the pipe. Should be able to really crank the pressure.
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The poly casing. I wanted something that didn't need soldering like copper pipe and threaded tube fittings
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Unread postAuthor: Carlman » Sat Jun 21, 2008 7:44 am

where did you get the aluminium from mate ive been looking EVERYWHERE :shock:

nice find and cant wait!!
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Unread postAuthor: Mitchza89 » Sat Jun 21, 2008 7:56 am

Bunnings mate. When I saw it I just licked my lips and said MINE! it's in the "mouldings" section. For house building and what not. You'll see a rack of 8, 15, 20 and 25mm alu tube. In 1m lengths and 6m lengths. The 1m of 25mm was about... 6 bucks. The poly pipe was 3....You can't go wrong!
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Unread postAuthor: Lentamentalisk » Sat Jun 21, 2008 10:23 am

the issue still remains of thread strength, though if the pipe was rated to 400psi in the first place, it should work great to strengthen it.
Good luck on your repeater.
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Unread postAuthor: SpudFarm » Sat Jun 21, 2008 10:26 am

threads can be stronger - locking screws.

another thing you can do is to put the pipe in while in the shop put on two end caps and buy it. free alu pipe. (don't blame me)
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Unread postAuthor: Mitchza89 » Sat Jun 21, 2008 6:16 pm

It's too tight of a fit. I had to get the pipe in with a rubber mallet :D
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