Pneumatic Cylinder/Piston Question

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SpudFiles Forum Index » Pneumatic Cannon Discussion » Pneumatic Cylinder/Piston Question

Pneumatic Cylinder/Piston Question

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SEAKING9006

Posted: 06/23/2008 18:05 PM Post subject: Pneumatic Cylinder/Piston Question

Lieutenant Colonel

Joined: 23 Jun 2008
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What sizes of PVC are available at Home Depot or Lowes that will fit well enough into each other to use them to make a pneumatic piston? I don't mean like your regular tee piston, i mean like a piston for a blow back/blow forward valve or for a general use telescopic cylinder. I want to make one for my next attempt at a cannon, which will use a crude blow forward.

blind909

Posted: 06/23/2008 18:13 PM Post subject:

Colonel

Joined: 02 Aug 2007
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1 inch sch 40 pvc fits perfectly inside of 1 1/4 inch sch 40 pvc.

daxspudder

Posted: 06/23/2008 18:21 PM Post subject:

1st Lieutenant

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1.5" nearly fits in 2", and with a little high grade electical tape will work perfect, as long as you make it so it "floats" in its space on its O-rings

SEAKING9006

Posted: 06/23/2008 18:44 PM Post subject:

Lieutenant Colonel

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Sweet. Now I'll be able to build my blow forward valve.

SpudFarm

Posted: 06/23/2008 18:57 PM Post subject:

Hybrid Guy
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when you say it a pneumatic press would be fun.

large surface area and 150psi would have crushed you.

SEAKING9006

Posted: 06/23/2008 19:01 PM Post subject:

Lieutenant Colonel

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spudfarm wrote:

when you say it a pneumatic press would be fun.

large surface area and 150psi would have crushed you.

Hmmm.... Sounds like fun. Twisted Evil

SpudFarm

Posted: 06/23/2008 19:03 PM Post subject:

Hybrid Guy
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yepp.. but then you would need a 40" piston to get any real damage.

SEAKING9006

Posted: 06/23/2008 19:10 PM Post subject:

Lieutenant Colonel

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spudfarm wrote:

yepp.. but then you would need a 40" piston to get any real damage.

Or four 6" pistons on a sheet of steel......

markfh11q

Posted: 06/23/2008 19:20 PM Post subject:

Magic Dust Man
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If you're looking for a good seal that will fit into pipe, do the obvious thing and use a test plug. They are used to seal off drain pipe and fittings to do leak tests and can be expanded and contracted by use of a wing nut. Further, you can use a standoff on the end of the threaded rod through the center of the plug to attach more threaded rod for a piston arm.

I don't see how you're going to achieve a double-acting cylinder, though, as you still need to seal the piston arm from the cylinder. Single-acting is easily achievable though (with maybe a few minor leaks).

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