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| THEMOST |
 Posted: 11/13/2006 19:23 PM Post subject: What is the best type of rubber to make a piston valve? |
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Sergeant
Joined: 06 Oct 2006
Posts: 95
34.10 Spud Bux
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I'll be making a gun that uses about 100-150psi what is the best type of rubber to use? (fyi: I want to make one of the pistons with the screw through the rubber) I wont be able to repair it as It will be sealed and It uses a 3/4" pvc barrel (sch 40). Thanks  |
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| PVC Arsenal 17 |
| Posted: 11/13/2006 19:34 PM Post subject: |
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WITTY PHRASE
Joined: 27 Mar 2006
Posts: 1256
819.59 Spud Bux
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I know that rubber pipe caps are real thick and probably will work good
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| SpudStuff |
| Posted: 11/13/2006 19:55 PM Post subject: |
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Major General
Joined: 10 Dec 2005
Posts: 1379
128.17 Spud Bux
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| If you cut out a perfect circle it works as a piston it's self. You can get thoes in the ABS section. |
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| PVC Arsenal 17 |
| Posted: 11/13/2006 20:01 PM Post subject: |
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WITTY PHRASE
Joined: 27 Mar 2006
Posts: 1256
819.59 Spud Bux
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| Yeah find something metal that's the diameter you need like a copper coupling and sharpen it up then punch out the cap with a mallet. |
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| SpudStuff |
| Posted: 11/13/2006 20:11 PM Post subject: |
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Major General
Joined: 10 Dec 2005
Posts: 1379
128.17 Spud Bux
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| A sharpened steel pipe makes uber sweet pistons! |
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| Infernal2 |
| Posted: 11/13/2006 20:53 PM Post subject: |
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Staff Sergeant
Joined: 11 Sep 2006
Posts: 122
274.15 Spud Bux
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| Or, if you have access to a drill press you can use a circle cutter and make great circles. |
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| SpudStuff |
| Posted: 11/13/2006 21:20 PM Post subject: |
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Major General
Joined: 10 Dec 2005
Posts: 1379
128.17 Spud Bux
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| And destroy the edge of the rubber! |
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| markfh11q |
| Posted: 11/13/2006 22:29 PM Post subject: |
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Magic Dust Man
Joined: 06 May 2006
Posts: 1584
60.70 Spud Bux
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Or... you can just get a gasket cutter!
Anyways, that's not the point. He asked what type of rubber, and we're sitting around here yelling about different ways to cut it.
I suggest neoprene, of a relatively harder composition that the stuff you see at the hardware store. I've still got a bit left of my first 4x36" piece of 70A shore durometer neoprene, and I use it all the time for random sealing jobs. Keeps air back at 150 PSI in my copper gun... should work for you. |
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| sgort87 |
| Posted: 11/13/2006 22:42 PM Post subject: |
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The Gort
Joined: 18 Sep 2005
Posts: 869
924.49 Spud Bux
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| Personally, I'm a big fan of 30A. |
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| squeaks |
| Posted: 11/13/2006 22:43 PM Post subject: |
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Captain
Joined: 01 Oct 2006
Posts: 329
466.29 Spud Bux
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| Just a question, how thick should it be approximately(metric and imperial please) |
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| markfh11q |
| Posted: 11/14/2006 5:37 AM Post subject: |
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Magic Dust Man
Joined: 06 May 2006
Posts: 1584
60.70 Spud Bux
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I like 1/8" or about ~3.2mm thick.
I would try 30A, and actually I've had incidences with the 70A where it had to seal against an uneven sealing face, (a small marble coaxial), and I thought to myself, this would be easier if the neoprene was softer. But, with a little work smoothing the surface, or even just stepping up the pressure to around 150 PSI, you get it to seal. I probably should order some 30A, (well, maybe a little stiffer than that), with the parts I gotta order in a few weeks or so for my hybrid. |
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