Page 2 of 2
Posted: Sat Jul 21, 2012 9:01 am
by Larda
No, but with a burstdisk it goes of with a bang.
I actually did try to pilot it with the schrader, and without the valve core in place and it almost worked fine.
The barrel is 43mm, so its perfect for golfballs, maybe i should bring it to the driving range for test shooting?
Posted: Sat Jul 21, 2012 9:13 am
by jackssmirkingrevenge
With a floating o-ring it would have worked with the schrader
but if you're using burst disks it clearly isn't necessary.
Posted: Sat Jul 21, 2012 7:46 pm
by killerbanjo
Cant wait to see the finished product... These are really sexy!
Posted: Sat Jul 21, 2012 10:15 pm
by Fnord
Ack! missed this the first time around rainbowdroolraptor.jpg
Yes larda, do not waste this merely on wimpy airsoft bbs. High pressure tests must also be done.
[For Science]
Posted: Sat Jul 21, 2012 10:34 pm
by iknowmy3tables
this is very cool, I remember jack had a design a lot like this that he wanted to make but never had the facilities.
I've got a new job that has a machine shop and I was wondering how you get those flush threads non-NPT style threads needed to squeeze the burst disk, all the taps and dies I've ever seen are tapered so to get complete threads you'd need to pass all threaded sections past the tapered sections. did that make sense?
Posted: Sun Jul 22, 2012 5:45 am
by Larda
I am cutting the threads with the lathe, so then i can get a good thread almost all the way.
And if you lock at the plug you can see that the first few millimeter is turned to a slightly smaller diameter.
To seal against the burstdisk i have counterbore at the bottom with a rubber/metal washer.
Posted: Sun Jul 22, 2012 5:50 am
by jackssmirkingrevenge
iknowmy3tables wrote:this is very cool, I remember jack had a design a lot like this that he wanted to make but never had the facilities.
I have since discovered hybrids though
Posted: Sun Jul 22, 2012 8:18 am
by Larda
One interesting thing with this cartridges is that i am right now not using any rubber sealing between the barrel and the piston, its just POM-C Acetal plastic against metal.
And still the cartridge seems to hold the pressure,but i haven't tested it for a longer period of time, just a few hours at most.
Posted: Tue Jul 31, 2012 12:19 am
by Live1nce
This is great! I cant wait to see this things completed! I really hope you invest some time when its all done into some nice video footage! This thing will be a beaut!
Posted: Tue Jul 31, 2012 8:45 am
by Gun Freak
Good Lord Larda, you've done it again
Posted: Tue Jul 31, 2012 1:45 pm
by Labtecpower
Very very nice, fapworthy to say the least
Posted: Mon Nov 05, 2012 12:02 pm
by GonzoInferno
I am working on similar project. Are you doing the machining yourself?
Posted: Mon Nov 05, 2012 12:15 pm
by SkillessNoob
This project makes me happy inside.