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Serviceable coaxial

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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Serviceable coaxial

Unread postAuthor: Demon » Tue Sep 23, 2008 6:47 am

I seen a lot of people making serviceable coaxial but i dont understand how...

If i was using male and female adapter, there will be a lot of dead space behind the piston

HOW?
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Unread postAuthor: far_cry » Tue Sep 23, 2008 7:57 am

http://www.spudfiles.com/forums/piston- ... t8157.html

look at the first piston valve the coaxial
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Unread postAuthor: Hotwired » Tue Sep 23, 2008 8:05 am

It really helps to draw a diagram of things like this, then ask yourself what exactly the problem is.
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Unread postAuthor: psycix » Tue Sep 23, 2008 10:59 am

Just make sure you can unscrew the backside or just the whole chamber.
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Unread postAuthor: ALIHISGREAT » Tue Sep 23, 2008 11:05 am

on my copper coax i just slodered a 28mm to 1" threaded coupler then put a 1" to 1/2" threaded bushing on the back... then a 1/2" QEV... its not hard, you just have to think about it a little :wink:
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Re: Serviceable coaxial

Unread postAuthor: MrCrowley » Tue Sep 23, 2008 2:51 pm

Demon wrote:I seen a lot of people making serviceable coaxial but i dont understand how...

If i was using male and female adapter, there will be a lot of dead space behind the piston

HOW?

Then make the piston longer or have a larger bumper to fill up that dead space.
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Unread postAuthor: Demon » Tue Sep 23, 2008 2:56 pm

look at the first piston valve the coaxial


I dont need to know how to make a coaxial, i already maked one!

And i finded how:

I will cut it in two and place an male and female adapter .

http://www.spudfiles.com/forums/coaxial ... 15949.html
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Unread postAuthor: noname » Sat Sep 27, 2008 8:26 pm

Seems like no one even considers <a href="http://www.spudfiles.com/forums/extreme-coaxial-t2146.html">diaphragms</a> anymore.
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Unread postAuthor: Velocity » Sat Sep 27, 2008 10:32 pm

noname wrote:Seems like no one even considers <a href="http://www.spudfiles.com/forums/extreme-coaxial-t2146.html">diaphragms</a> anymore.


Diaphagms are just a hassle in my opinion. It is difficult to build a cannon with a diaphragm that doesn't need to be reset every few shots. Furthermore, the flow they provide isn't tremendous. Piston valves are more reliable and have greater flow. They are slightly more difficult to make however (slightly).
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Unread postAuthor: noname » Sun Sep 28, 2008 8:42 am

Velocity wrote: It is difficult to build a cannon with a diaphragm that doesn't need to be reset every few shots.


I managed to nail it first try without any hassle at all; I guess it was just chance. I continued to use the same method as I did the first time and have never screwed up on one.

Velocity wrote: Piston valves are more reliable and have greater flow.


Reliability relies on the builder of any homemade valve.

Velocity wrote:They are slightly more difficult to make however (slightly).


Diaphragms only need to be a circle of rubber, whereas pistons require at least a sealing face along with some kind of "body" and possibly lubricant. My pistons have never worked for more than a year or so though; probably because I make them out of just random fittings and junk in my workshop.

Velocity, don't think I'm arguing just to argue; I'm trying to open the possibility of a diaphragm to Demon.
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