Syringe Coax Design?

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lklaussen
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Fri Oct 05, 2012 9:46 am

Hey guys, I haven't been on here for a while! The other day I was designing a mini pneumatic around a syringe for a small size projectile like an airsoft or pellet.

How many PSI can you put in a standard syringe before it explodes?

I've attached a pic of my design drafted up in google docs.

Will it work? What are some ways to improve it?
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coax piston in syringe
coax piston in syringe
pistonsyringevalve.jpg (23.54 KiB) Viewed 1663 times
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jackssmirkingrevenge
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Fri Oct 05, 2012 12:54 pm

Here's one I had made a long time ago, with the seal inverted and made into a toolies valve, not something you want to take beyond 50 psi though.
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s3dprototype.jpg
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s3dprototype (1).jpg
s3dprototype (1).jpg (29.76 KiB) Viewed 1643 times
hectmarr wrote:You have to make many weapons, because this field is long and short life
lklaussen
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Fri Oct 05, 2012 1:16 pm

That looks awesome! I'll probably make one like that with one of my smaller syringes. What can I use to plug the end other than epoxy?
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jackssmirkingrevenge
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Fri Oct 05, 2012 1:27 pm

You can machine an acetal endcap, cut an o-ring groove then drill and tap some radial holes so you can attach it to the syringe tube with bolts.

... or you can use epoxy ;) let's face it, if you're using syringe tubes then your resources are limited, therefore epoxy is your best friend :)
hectmarr wrote:You have to make many weapons, because this field is long and short life
lklaussen
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Fri Oct 05, 2012 1:59 pm

That's true, but I am currently out of epoxy :shock:
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jackssmirkingrevenge
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Fri Oct 05, 2012 2:07 pm

My first pneumatics were made with balsawood endcaps held together with this stuff:

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hectmarr wrote:You have to make many weapons, because this field is long and short life
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