regulator piston problem and thoughts

[SWE HooK]

got hold on a couple non funktioning almost complete automags that needed some love and care that got build together as a minimag pistol.

but heres my question... had some isues with fluxing velocity over crono and checked the regulator piston oring surface and found that it is somewhat irregular in surface like streaks frome lathe machining and checked at my working mag and found out that it too had slight irregular surface where velocity piston is seated but it works for that valve but caught my attention when two valves got the same type of streeking ore if this is a normal thing that other had stumbled upon also?

so is it just me that thought it should be smoth surface for the regulator piston oring ore is this a common thing and nothing to worry about?

[SWE HooK]

lots of views but no answer

[Tunaman]

lots of views but no answer

are you talking about the inside of the valve half where the reg piston oring rides? Or on the piston itself? If so, in all my years of teching these mags I have never run across one that didnt seal there...or needed attention there. You can always polish it if that would make you feel better.

[bowcycle]

If something is scoring the piston, that's a problem. The o-ring is what makes the seal and the springpack is what will have a bigger impact on velocity consistency, but if there's enough junk in there that the piston is getting messed up, then you definitely need to clean out the reg back and re-grease everything.

[SWE HooK]

are you talking about the inside of the valve half where the reg piston oring rides? Or on the piston itself? If so, in all my years of teching these mags I have never run across one that didnt seal there...or needed attention there. You can always polish it if that would make you feel better.

yes its on the inside the regulator where the reg pistin oring rides.
its not that it aint seling its not leaking but as mentiond i got some sporadic fluctuation over crono and got picky in mu serch for an explanation and found on two valves with different numbers with smal rifeling from the lathe process from manufacturing.

my next theory is that my regulator on airtank is the problem by leaving fluctuation in air pressure and therfore upsetting the regulator in the automag valves.

[SWE HooK]

If something is scoring the piston, that's a problem. The o-ring is what makes the seal and the springpack is what will have a bigger impact on velocity consistency, but if there's enough junk in there that the piston is getting messed up, then you definitely need to clean out the reg back and re-grease everything.

its probably just me that is over picky on details this time... had got the regulator piston out a couple of times and cleand and greased it up so its clean and nothin to scoring the piston but there seem to be some rifeling from the manufacturing process in the surface that is sealing agaist the oring on the piston on two different valves that i in my search for a explanation to my problem with fluxing speed on crono had made sort of a tiny feather in to an ostrich and that my find is irrelevant to the problem but not to make a asumption i asked if ther is more that got the same "findings" in ther regulators.

[Tunaman]

its probably just me that is over picky on details this time... had got the regulator piston out a couple of times and cleand and greased it up so its clean and nothin to scoring the piston but there seem to be some rifeling from the manufacturing process in the surface that is sealing agaist the oring on the piston on two different valves that i in my search for a explanation to my problem with fluxing speed on crono had made sort of a tiny feather in to an ostrich and that my find is irrelevant to the problem but not to make a asumption i asked if ther is more that got the same "findings" in ther regulators.

I would be more inclined to replace the regulator seat...and then dont take it apart until something breaks. Everytime you unscrew the halves they do not wind up in the same place on the reg seat...causing fluctuations in velocity.

[SWE HooK]

I would be more inclined to replace the regulator seat...and then dont take it apart until something breaks. Everytime you unscrew the halves they do not wind up in the same place on the reg seat...causing fluctuations in velocity.

that part i know not to take the halves apart when ther is a new regulator seat in, im just tinkering with regulator piston back at the velocity adjustment as ther where the place i asumed might be the problem and as stated ther might be problem with my botle to that might causing the problem.
its just annoying not finding the problem and im start with wild speculating and finding a nonproblem and get stuck with that whilst ther might be a simpler explanation.

[athomas]

Did you ever find the exact problem? I have seen dirt in the piston area cause velocity fluctuations before. The regulator is also one of the more likely culprits, especially when they get old and hardened, and get disturbed when the valve is taken apart. The bottle regulator can cause minor issues, but is less likely to be the culprit due to the big swing in pressure that would be required in order to cause enough of a difference in the mag regulator. A bottle regulator is more likely to have flow issues causing drop off during rapid fire situations than fluctuations in velocity. Another major source of velocity fluctuations is bad paint. This can be more exaggerated with some barrels than with others depending on the paint to barrel mismatch.

[SWE HooK]

Did you ever find the exact problem? I have seen dirt in the piston area cause velocity fluctuations before. The regulator is also one of the more likely culprits, especially iwhen they get old and hardened, and get disturbed when the valve is taken apart. The bottle regulator can cause minor issues, but is less likely to be the culprit due to the big swing in pressure that would be required in order to cause enough of a difference in the mag regulator. A bottle regulator is more likely to have flow issues causing drop off during rapid fire situations than fluctuations in velocity. Another major source of velocity fluctuations is bad paint. This can be more exaggerated with some barrels than with others depending on the paint to barrel mismatch.

no as to this point im still not find the problem with fuxing speed and as you say ther might be problems with quality on the balls im using and this season my field had problems that balls where smaler then last year so my big .690 barrel is like throwing a golfball down a tunnel and that might also be part of the problem ore the hole problem right there.

as for the last cuple of months im using my magpistol "horny as its named" that is sweet as suggar to shoot and its got a coolant hose as maggasine so its a 17 shots handload "stock class" thingy.
way fun to be light and nimble not to tote around with exesive amount with pods and heavy loader as my rotor..

[Sandman]

I've never seen or heard of "machine" marks at all in any regulator batch or series of serial numbers produced by AGD. What you are most likely seeing is the reflection of the threads on the super polished surface.
Those surfaces were specifically burnished to a high polish. Any machine marks you are seeing is either a trick of the polish or someone after the fact has run a tool down there and ruined the finish.

[SWE HooK]

I've never seen or heard of "machine" marks at all in any regulator batch or series of serial numbers produced by AGD. What you are most likely seeing is the reflection of the threads on the super polished surface.
Those surfaces were specifically burnished to a high polish. Any machine marks you are seeing is either a trick of the polish or someone after the fact has run a tool down there and ruined the finish.

might be as sandman says someone made a bobo and ruined the surface.
other than that is im start to belive the oil im lubed with sems to be to dry compared to "autolube" and making the regulator piston sticking slightly.

[dano_____]

Just curious, when you say velocity fluctuations, how good is the paint youre shooting as far as roundness and size goes? Also are your detents in good shape or are they old? Finally what body and bolt are you using?

[SWE HooK]

Just curious, when you say velocity fluctuations, how good is the paint youre shooting as far as roundness and size goes? Also are your detents in good shape or are they old? Finally what body and bolt are you using?

im shooting toro paint should say that it is good quality paint.
size is around 685-687 in a 690 straight barrel 14", detents im using a wire detent that is i good shape but fairly old.
using both LVL 7 and LVL 10 bolts with same fluctuation over crono.
to this season i might try another oil in this marker.

as mentioned in erlier post for the last season im used another marker (autolube oiled) named it "horny" set up as pistol.

[SWE HooK]

as of today im not yet find an good answer to my problem more then that most of the problem seems to come from that modern paint gets smaller and smaller and the barral to paint match dont get near the standard what is good and acceptable.