Although an added 50% thread length would look safer somehow.
Maybe I can cup it, as attached?al-xg wrote:The Delrin would still have to withstand the 28x starting pressure.
I know what you mean, but it's such a small bore...Threaded Delrin just doesn't seem right
Hmmm... interesting thought.It seems the reduced ring surface aera works quite well. With the last drawing you could do the smaller "O" ring with a stepped bore to prevent too much compression, would be nice if it worked without though.
*cough*Oh and this came up on the French forum:
http://www.airmunition.info/index.html
Not very powerful, but still pretty cool.
... mostly due to a poorly sealing fill rig it seems, nothing to do with the cartridge design.Labtecpower wrote:But I see you had sealing problems..
POLAND_SPUD wrote:lol that reminds me of one occasion when I was going to suggest caseless (more like GP-25 granades than this) ammo on one occassion but then I realized you want flying brass dammit!
hectmarr wrote:You have to make many weapons, because this field is long and short life
Hmmm... I'm sure a rifle sized Delrin cartridge with reasonably thick walls could take a couple of hundred psi safely... but still, not brassal-xg wrote:Is that for sealing or for holding together ? I was referring to POLAND's full Delrin cartridge suggestion.
You know, this one with the hole for the pins drilled off-centre to avoid the spark jump issue should be fine, it can be a single pin too.I reckon the first drawing was OK, I'd just have a longer thread on it, I guess the next test will tell
hectmarr wrote:You have to make many weapons, because this field is long and short life
), the bore is .22 though. hectmarr wrote:You have to make many weapons, because this field is long and short life
al-xg wrote:Yeah no tape would be better. Tapered thread? Or O-ring on the brass or Delrin ring. The delrin plug should seal depending on the fit but I guess an o-ring or rubber washer could be used.
hectmarr wrote:You have to make many weapons, because this field is long and short life
two spudgunners (al-xg + jsr) and one cupthat sounds worse than I thought
not a new concept - I've seen two guns that used it3 way valve + regulator + syringe -> automated syringe metering
Been there (I understand you're referring to the fact that detents need to reach a given minimal pressure to work correctly)What is critical is that the pressure drop on the outside of the fill rig should be dramatic
to keep the ammo pressed against the oring ??Could one not just chuck a spring in there?
Which one is it by the way?al-xg wrote:Some more useless 3D. I just like using the program
two spudgunners (al-xg + jsr) and one cup
(and I managed to find that with spudfiles search 
)... rather while emptying the rig, this is what I've been doing.I guess one just has to keep the cartridge pointing down while filling.
Better to add one time complexity to the fill rig than complicated every cartridge, this is how I see it:Could one not just chuck a spring in there?
hectmarr wrote:You have to make many weapons, because this field is long and short life
Oh yeah I keep forgetting the whole cartridge goes in.... rather while emptying the rig, this is what I've been doing.
SolidWorks, very user friendly, probably my preferred choice for CAD now.Which one is it by the way?
Weren't you meant to be venting the filling chamber on disconnecting the schrader ?this is how I see it:
