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Reducing a 3/4" barrel to 1/4"

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Reducing a 3/4" barrel to 1/4"

Unread postAuthor: boyntonstu » Thu Aug 06, 2009 2:23 pm

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Reducing a 3/4" barrel to 1/4"


A 1/4 hole in a 2" piece of 3/4" dowel, a groove, an O ring, epoxy.

The 1/4" tube/piston goes into the 3/4" barrel.

A split dowel at the muzzle, a strong piece of Nylon reinforced hose and a pair of hose clamps, fixes the 1/4" barrel to the main chamber.

This technique could be used for almost any air cannon.

If I blow into the 1/4" tube, the 3/4" piston and 'arrow' is easily forced out of the 3/4" Type M tube. This movement indicates good seals and sliding smoothness.


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Unread postAuthor: Technician1002 » Thu Aug 06, 2009 2:34 pm

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Take two of these for the strength of soldered fittings.

3/4 to 1/2 and 1/2 to 1/4.
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Unread postAuthor: boyntonstu » Thu Aug 06, 2009 5:21 pm

Technician1002 wrote:Image

Take two of these for the strength of soldered fittings.

3/4 to 1/2 and 1/2 to 1/4.


Thanks,

I agree, but I am in the testing stage of a slingairgun.

I need to determine the distance from the end of the piston stroke to the barrel breech.

I need to trombone it.

In my slingairgun there is no built up pressure to be concerned about.

Once all length are determined, I will go to a soldered or a screw barrel attachment.

What I have for experimenting is perfect for my needs.

BoyntonStu




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