Is there an actual distance the On/Off pin must travel? if so what is the measurement

[trevorjk]

i have been doodling and making small replicas and if all have served me right i may have a drop in for my mag that will make the trigger pull down to about .5mm but i will see how much it really is once i have a working prototype.

but now to my question i need to know the exact distance the on off pin must travel to properly ingage and disengage the valve. understand???

once i get this exact measurement i will be able to go from there but as off now im kinda stuck cuase i cant get an exact measurement with the equipment i have

thanks


*and on a side note there would be and should be no reason why this would ruin your warrenty but i guess ill have to send one to AGD once i get around to finishing it cuase as of right now i see no reason for wear on the gun maybe a little on my spindle but ill be using high strength steal for that i guess we will have to wait for proper testing for that to*

[trevorjk]

well???

i heard .015 of an inch can any verify this?

[trevorjk]

?

[txaggie08]

bump cause im curious to

[hitech]

I don't know, but it's not very much. You should be able to determine how far it currently moves. Knowing AGD it's probably somewhere near double what it needs to be. You will start getting shootdown if it's too short. Sorry I don't really know, but I did at at least read your post.

[the electrician]

I've done a bit of research in this department.

as far as minimum movements go, the minimum movement of the on/off pin is actually dictated by the minimum movement of the front "bolt catch" part of the sear. you see, it has to go from fully engaged to the bolt, to just out of the way. basically flush with the inside edge of the body tube. the sear has to move that much. therefore the on/off pin movement is farther than what it absolutely has to be. how far it has to move to seal becomes insignificant.

I have measured the on/off pin movement at .130" minimum.

that help?

[trains are bad]

ah, but perhaps the question was what the actual distance the the on/off pin must travel.

Meaning if it was disconnected from the sear, what is the minimum distance to go from fully sealed to open enough. Don't know how you would actually get that value though. I'm sure it's very small.

[txaggie08]

quick question on gun theory. since the bolt blows forwar, is a bolt catch on the front of the sear absolutley necesary. Would an actuator(like a push solenoid) firing the on off be sufficient to operate the gun. guess the jist of this is will the gunn work withou a sear if the on off can be controled

[athomas]

No. The sear holds the bolt in place while the pressure builds or is held in the chamber. Without the sear, the bolt would blow forward as soon as the chamber pressrue reached a value high enough to overcome the return force of the spring. This could be used in a design but the lag between trigger actuation and a fully charged chamber would cause it to be impractical on the mag.

[txaggie08]

thanks. Thats exactly the answer(well not exactly but the right type anyway) i was looking for)

[hitech]

This could be used in a design but the lag between trigger actuation and a fully charged chamber would cause it to be impractical on the mag.

What if you used a lighter spring? A solenoid could operate the on/off... Might be a simple way to increase the efficiency of a mag...

[athomas]

A solenoid could operate the on-off easily. That's not a problem that I see. What would hold the bolt back if it does not have a sear? You would have to keep the air out of the chamber until it was time to fire the gun. When the gun was fired, the first action would be to open the on-off and charge the front chamber. Once the chamber pressure exeeded the bolt spring return force, the bolt would move forward and dump the air to fire the ball. The on-off could then be closed so that the bolt could return once the chamber was empty. This would work except there is a charge time associated with the valve. It isn't much but it would delay the firing of the ball by that amount of time.

[the electrician]

ah, but perhaps the question was what the actual distance the the on/off pin must travel.

Meaning if it was disconnected from the sear, what is the minimum distance to go from fully sealed to open enough. Don't know how you would actually get that value though. I'm sure it's very small.

with a standard o-ring, it will have to move atleast .0312" just to get out of the o-ring, then I'm sure it will need more to get out of the way enough to get enough flow to fill the chamber as fast as it can. I'll bet another .062 minimum. so I'll guess at .093"
that's just a guess.

[trevorjk]

wooo old thread :-D

hrm, i had no luck with my little mod thing i was doing cuase the ULT is just way to unstable (always going berzerk) and i couldnt get good measurements... maybe ill get board enough again to try it again