there are no orings on the piston so it should equaliseWhy would this work
0.22" mini piston hybrid
- POLAND_SPUD
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You will still probably need a spring, otherwise the piston will never be motivated to move forward to seal (until you depressurize the fill rig). There would be equal force on both sides of the piston.POLAND_SPUD wrote:there are no orings on the piston so it should equaliseWhy would this work
POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name
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Hmm I guess you're rightYou will still probably need a spring, otherwise the piston will never be motivated to move forward to seal (until you depressurize the fill rig). There would be equal force on both sides of the piston.
A spring would be useful... though the filling rig would neeed a pin for depressing the piston as the cartridge is filled
Personally I think that a detent based cartridge would be better...
though it's hard to tell what is better a detent based cartridge that has issues with sealing or a more complicated and difficult to build piston based cartridge
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The spring doesn't have to be unnessecarily strong. It only has to hold the piston forward, it doesn't need to hold back ignition pressure. Due to the relatively large piston surface, it won't take much pressure to move the piston in order to fill the cartridge.A spring would be useful... though the filling rig would need a pin for depressing the piston as the cartridge is filled
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mind you the ID of the barrel is 5.5mmDue to the relatively large piston surface, it won't take much pressure to move the piston in order to fill the cartridge
for a pneumatic it wouldn't be a big deal... but a spring will have an effect on fueling
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- jackssmirkingrevenge
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Here's the basic idea for filling:
1) cartridge placed in rig, and fuel (calculated to give a correct ratio for a correct mix taking the fill rig volume into account as well) is injected
2) the rig is capped and taken up to correct pressure. There are no airtight parts in the cartridge so both chamber and "pilot" are pressurised.
3) the rig is depressurised through the schrader, and the pressure imbalance causes the piston to shut, sealing off the cartridge.
A weak spring keeping the piston shut would be helpful with reliability though...
Will try to conjure up a prototype today.
1) cartridge placed in rig, and fuel (calculated to give a correct ratio for a correct mix taking the fill rig volume into account as well) is injected
2) the rig is capped and taken up to correct pressure. There are no airtight parts in the cartridge so both chamber and "pilot" are pressurised.
3) the rig is depressurised through the schrader, and the pressure imbalance causes the piston to shut, sealing off the cartridge.
A weak spring keeping the piston shut would be helpful with reliability though...
Will try to conjure up a prototype today.
hectmarr wrote:You have to make many weapons, because this field is long and short life
- jackssmirkingrevenge
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That fact is inescapable. A coaxial piston cartridge of given dimensions will invariable be more complex to put together and be less powerful than a "valveless" cartridge of equivalent size.POLAND_SPUD wrote:Personally I think that a detent based cartridge would be better...
though it's hard to tell what is better a detent based cartridge that has issues with sealing or a more complicated and difficult to build piston based cartridge
Hmmm...
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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yup... orings
orrrrr
if it works for copper it should work for lead
not sure if it would be better to use the projectile itself as the seal or would you need a seperate olive...
the more I think about this the more the better the idea seems
orrrrr
if it works for copper it should work for lead
not sure if it would be better to use the projectile itself as the seal or would you need a seperate olive...
the more I think about this the more the better the idea seems
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- Brian the brain
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Why not fill the cartridge through the barrel port?
Thread it and you don't need the rig thing.
You might even be able to put it in a compression fitting whilst filling....
I would throw in the spring though.
It will keep that portion of the gas from escaping that split second of decompressing the barrel port.
Thread it and you don't need the rig thing.
You might even be able to put it in a compression fitting whilst filling....
I would throw in the spring though.
It will keep that portion of the gas from escaping that split second of decompressing the barrel port.
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
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I had contemplated this for another design but the fill rig is a one time build and allows for a much cleaner cartridgeBrian the brain wrote:Why not fill the cartridge through the barrel port?
Thread it and you don't need the rig thing.
For the piston design a small spring would definitely be helpful.I would throw in the spring though.
It will keep that portion of the gas from escaping that split second of decompressing the barrel port.
I proved it works a while ago.POLAND_SPUD wrote:the more I think about this the more the better the idea seems
No need for compression fittings though, the projectile should be forced into a smaller bore. Airgun pellets are typically oversided for their calibre to ensure a good seal.
Here's a thought, avoiding threaded fittings instead having a "full bore" rear plug o-ringed and held by pins for full access and the ability to load the projectile from behind, which would also work for a silicone seal.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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I'm new around here, and after reading this, I have been admired by the passion they put into their work without any doubt, I have learned a little, since I'm just initiating me in this of hybrid gun
Despite cost me a lot to understand the language, my English is very basic, the translator helps me to read and write, I would love to discuss this. I keep reading and watching ... Greetings
Despite cost me a lot to understand the language, my English is very basic, the translator helps me to read and write, I would love to discuss this. I keep reading and watching ... Greetings
Last edited by jrrdw on Sun Jul 24, 2016 5:14 pm, edited 1 time in total.
Reason: Edited for content.
Reason: Edited for content.
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great job everyone i hope you all have a great day
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what feul do you think whould work the best