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| Mitchza89 |
 Posted: 06/21/2008 5:57 AM Post subject: For The Aussie Spudder! - Extreme Poly Pipe |
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Brigadier General
Joined: 08 Jan 2007
Posts: 871
1795.29 Spud Bux
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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.
| Description: |
| The poly casing. I wanted something that didn't need soldering like copper pipe and threaded tube fittings |
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298.44 KB |
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| Description: |
| 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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290.26 KB |
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268.23 KB |
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6 Time(s) |
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| Carlman |
| Posted: 06/21/2008 6:44 AM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1210
1.86 Spud Bux
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where did you get the aluminium from mate ive been looking EVERYWHERE 
nice find and cant wait!!
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| Mitchza89 |
| Posted: 06/21/2008 6:56 AM Post subject: |
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Brigadier General
Joined: 08 Jan 2007
Posts: 871
1795.29 Spud Bux
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| 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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| Lentamentalisk |
| Posted: 06/21/2008 9:23 AM Post subject: |
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Resident Tinkerer
Joined: 07 Aug 2007
Posts: 863
1024.01 Spud Bux
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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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| SpudFarm |
| Posted: 06/21/2008 9:26 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2111
1224.57 Spud Bux
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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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| Mitchza89 |
| Posted: 06/21/2008 17:16 PM Post subject: |
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Brigadier General
Joined: 08 Jan 2007
Posts: 871
1795.29 Spud Bux
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It's too tight of a fit. I had to get the pipe in with a rubber mallet 
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