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Quick connect coupling question

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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Unread postAuthor: jackssmirkingrevenge » Sun Nov 27, 2011 9:51 pm

Image

The idea of this design was that you could could get high performance with relatively low pressure, because of the large area of the piston - with the added benefit of not being so loud :)

Here's a nice example of the concept fleshed out.
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 3:26 am

Thanks JSR :) excuse the noobishness (is that even a word?) , but I don't exactly get how it works. Does the plunger kind of act like a pneumatic ram that pushes the small tube, firing the knife?
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 3:35 am

sharpshooter11000 wrote:Does the plunger kind of act like a pneumatic ram that pushes the small tube, firing the knife?


Precisely.

The quick connect has no sealing function, it just holds the blade in place and serves as a "trigger".

Again by using a relatively large diameter plunger you get a lot of force for low pressure.
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Unread postAuthor: pneumaticcannons » Mon Nov 28, 2011 4:11 am

If you do end up building this, you will want to make it serviceable. I usually take mine apart and lubricate it every 20-30 shots.

As for operating pressure, I've pushed mine up to 350 psi but the trigger is REALLY hard to pull at that pressure.
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Last edited by pneumaticcannons on Mon Nov 28, 2011 4:53 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 4:42 am

pneumaticcannons wrote:I usually take mine apart and re-oil it every 20-30 shots.


Oil?

Never a good idea with syringe seals in my experience, the rubber tends to absorb it, causing it to expand and gum up.
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Unread postAuthor: pneumaticcannons » Mon Nov 28, 2011 4:53 am

jackssmirkingrevenge wrote:
pneumaticcannons wrote:I usually take mine apart and re-oil it every 20-30 shots.


Oil?

Never a good idea with syringe seals in my experience, the rubber tends to absorb it, causing it to expand and gum up.

sorry, I forgot to mention that I use silicon oil :wink:
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Unread postAuthor: jakethebeast » Mon Nov 28, 2011 8:58 am

Sharpshooter: Have you noticed a place called "Epoxyland" at UK? I bet you havent, so JSR can be from UK :D :D
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 10:41 am

jakethebeast wrote:Sharpshooter: Have you noticed a place called "Epoxyland" at UK? I bet you havent, so JSR can be from UK :D :D


Hmm no I forgot about that :D and...

Google Maps wrote:No results found for "Epoxyland"


:lol:
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 3:13 pm

JSR how much pressure should a syringe hold? Also that must be a very big syringe, where do you get them?
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 4:49 pm

sharpshooter11000 wrote:JSR how much pressure should a syringe hold?


Syringes aren't really meant to hold pressure, the above design was thought up to work at 20-30 psi using the benefit of large piston area to compensate. If you intend to use higher pressures, the syringe should be sleeved in a stronger tube and the gap between syringe and tube filled with epoxy.

Also that must be a very big syringe, where do you get them?


http://www.amazon.co.uk/60ML-SYRINGE-CA ... 890&sr=8-2
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Unread postAuthor: Zeus » Mon Nov 28, 2011 4:56 pm

Also, ag stores are a good place to get syringes, I paid $4.50 for a 60ml, but I didn't need to order it in.

And I got a bag of sulphur, but I shan't go into that.
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 4:57 pm

Ah thanks. I might get a handle machined, that would be safer.
Hmm... Zeus, I'm not even gonna ask :roll:
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 29, 2011 12:45 am

sharpshooter11000 wrote:Ah thanks. I might get a handle machined, that would be safer.


If you have that option, go for it!
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