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loading and installing O-ring for coax
Posted: Mon May 09, 2011 4:16 am
by shiny455
I'm currently building a gun with a coax piston valve to shoot .3 calibre ball bearings the last thing i think i am having trouble with is finding a way to load the ball bearings into the barrel. i would like to be able to put it in behind a o-ring or bead of silicone to help performance and so the ball bearing won't fall out if i tilt the gun down. i was thinking a slot in the barrel and a sliding cover close to the chamber but this would give dead space and i don't know how well the sliding cover will work.. any ideas or is this the only way
Posted: Mon May 09, 2011 4:21 am
by Technician1002
If the bearings are steel, a small magnet works wonders.
Posted: Mon May 09, 2011 5:25 am
by shiny455
yeah they are steel just tested the magnetic definitely attracts them thanks for the idea ill epoxy a couple of magnets to one end of the barrel
Posted: Tue May 10, 2011 8:03 am
by POLAND_SPUD
well you might as well use the oring as the valve (it's called a detent)
JSR will agree with this
Posted: Tue May 10, 2011 8:37 am
by jackssmirkingrevenge
JSR agrees, of 0.3" ball bearings, with a good enough detent (o-ring sandwiched between threaded fittings) you can get amazing performance using just a blowgun as a main valve, as well as the potential for semi or full auto fire.
Posted: Wed May 11, 2011 6:06 am
by shiny455
it's called a detent
thanks for that i wasn't quite sure if 'detent' refered to the o-ring design i thought it was just for a dent in the barrel.
well you might as well use the oring as the valve
you can get amazing performance using just a blowgun as a main valve
i've already got most the stuff for a piston valve. but maybe for my next gun i kinda want a semi auto bb gun type of thing. would you be able to post a picture or link to the o-ring sandwiched between threaded fittings and are they adjustable. i know the detent would increase the performance by a lot but would there be a way of figuring out how much. i first thought that the coefficient of friction in GGDT would be it but i realised that it is the coeffiecent of friction for the whole barrel.
Posted: Wed May 11, 2011 7:03 am
by jackssmirkingrevenge
shiny455 wrote:i know the detent would increase the performance by a lot but would there be a way of figuring out how much. i first thought that the coefficient of friction in GGDT would be it but i realised that it is the coeffiecent of friction for the whole barrel.
If the detent pops at your operating pressure, use a generic valve with zero opening time
