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 Post subject: Re: My new baby! PP700SA
PostPosted: Sat Nov 03, 2018 5:31 pm 
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Joined: Sat Nov 05, 2016 10:52 am
Posts: 2783
Location: Caronport, Saskatchewan
Hobbyman2007 wrote:
I’d be willing to bet the “ regulator “ is creeping. I’ve just removed / bridged mine and am in the process of tuning for a bell curve . I was getting really big swings in velocity , had it set at just over 400 fps and would jump all over the map . If I can’t get this sorted out in the next hour . Huma will be getting my money for the V2 reg .
Glad to hear you got some birds! Have you thought of putting the reg back in and just tuning to the other side of the bell curve? Sounds like you had the gun set to the side of the curve that is starting to drop from more pressure than hammer spring. If you tuned it opposite so it had a little more hammer than pressure then you'd be on the other side of the velocity curve where it just starts to drop in velocity. That way when the reg creeps you have quite a bit of room for pressure increase before the velocity will start dropping.
Hope that makes sense. This also ensures that when you start running out of air you don't suddenly have the problem of the gun velocity climbing over 500fps and becoming illegal.
Might be easier to tune than without a regulator at all.
Cheers,
Wes

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sat Nov 03, 2018 5:51 pm 
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Posts: 359
Location: Canada
I pushed a pellet through the barrel and found a few very tight spots located under the threaded section near the muzzle. At the last tight spot the pellet is pretty much flush with the end of the barrel.This could be the problem.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sat Nov 03, 2018 6:18 pm 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 639
Location: Dowling ,ontario
I think I have the fix and it’s quite simple . No pics needed as I think this is as simple as it’s going to get . Step 1 , degas the gun . Step 2 remove air cylinder . Step 3 unscrew the threaded adapter from the action to access the regulator stem . Step 4 unscrew the small stainless screw and remove the white disc . Step 5 apply a small amount of super glue or your favorite adhesive to the flat side of the disc . Step 6 place disc with glue side down ,install screw and tighten to centre the disc. Step 7 , back the screw off about 1/2 turn from just touching the taper in the disc ( this is to allow the regulator piston to stroke) Step 8 reassemble and shoot
I took the regulator apart and found the small white disc was floating on the screw. Now how on earth is that supposed to work sealing both the tapper for the screw and the flat onto the seat? Once aired up and tuned the hammer spring to get 450 fps with the JSB kings I got over 40 shots on regulation with less than 15 fps ES. Much better than the 70 fps ES from before on just about every shot .

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sat Nov 03, 2018 9:27 pm 
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Location: Caronport, Saskatchewan
Very interesting! I just had one of the leakers apart and was working with this very area. I ended up putting a big oring in the metal area where the white seal is and that fixed the leak. I'd changed the other orings and couldn't find a solution til then. Putting it back together it was shooting within 5fps but I never shot a whole string or let it sit to see if it's creeping or not yet.
Thanks for sharing your trick! I'll do that next if I haven't cured this one.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sun Nov 04, 2018 6:26 am 
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Location: Canada
Interesting Hobbyman.
Give us a update on this after you have used it for a few hundred shots. Please.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sun Nov 04, 2018 3:59 pm 
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Location: Dowling ,ontario
Well not as good as I had originally hoped . Most shots from 220 bar down are “regulated “ but then every once in a while I get a jump of 20 to 30 FPS higher. Then I get a good jump once off regulated pressure .im going to keep shooting it as is and hope it just needs to break in some more.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sun Nov 04, 2018 11:02 pm 
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Location: Caronport, Saskatchewan
Hmm, I've got one with a problem. The first leaker I fixed worked well right away, but this next one, I got the leaking stopped but the reg is acting crazy like yours was. I glued down the white piece like you mentioned, and now it shoots much more consistent, but it still acts wacky in that at 3000psi its shooting in the 300's and at 2000psi its shooting at 500fps, so it's like the reg isn't working at all. Guess I'll be taking it apart again. Was hoping I had it fixed.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Sun Nov 04, 2018 11:05 pm 
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Most of these guns I tested seemed very consistent though they do tend to creep and have a bad first shot. Otherwise they have been very good at regulating as far as I've seen, besides a couple I have here, and now yours.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 1:14 pm 
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Location: Dowling ,ontario
wesb2007 wrote:
Most of these guns I tested seemed very consistent though they do tend to creep and have a bad first shot. Otherwise they have been very good at regulating as far as I've seen, besides a couple I have here, and now yours.

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Don’t get me wrong , this is a great pistol , even with its flaws it still out hunted the shotgun wielding hunter shot with me . I’m a pathological tinkerer and this pistol is definitely one of my favourites . I truly believe the regulator can work as its design is borrowed from a Steyr target rifle . It’s just a matter of finding out what it needs to get it there.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 3:08 pm 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 359
Location: Canada
I'm like you hobbyman this is a cool pistol to tinker with.
Soon I'm sure someone will figure this regulator creep out.
Thats what makes these forums so interesting.

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 3:16 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
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Location: Rocky Mtn Hse Alberta
The only way any regulator can creep is if the feed seat system leaks. If the low side leaks it will empty the reservoir.
The white seat disk iirc is also the reg body seal and is captured tightly by the tightening of the reg body. Gluing it in place imo is acedemic to it's function. Fluctuating velocities may indicate a sticky unresponsive sensing piston .
Might need a way to get a reg output gauge installed, hmm mmmm
Walter

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 5:01 pm 
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sounds like the reg needs to be lubed... :wink:

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 7:47 pm 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 639
Location: Dowling ,ontario
Voltar1 wrote:
The only way any regulator can creep is if the feed seat system leaks. If the low side leaks it will empty the reservoir.
The white seat disk iirc is also the reg body seal and is captured tightly by the tightening of the reg body. Gluing it in place imo is acedemic to it's function. Fluctuating velocities may indicate a sticky unresponsive sensing piston .
Might need a way to get a reg output gauge installed, hmm mmmm
Walter



Maybe I’m confused on how the Reg is supposed to be working . I was under the impression that as the Belleville’s collapsed from the incoming high pressure , the piston and screw pulled the opening shut in the disc closing off the air passage until the trigger was pulled .

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 8:33 pm 
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Location: Rocky Mtn Hse Alberta
You got it right hobby!

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 Post subject: Re: My new baby! PP700SA
PostPosted: Mon Nov 05, 2018 9:29 pm 
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Joined: Thu Mar 01, 2018 8:01 pm
Posts: 234
Location: Klowntown BC
Quote:
sounds like the reg needs to be lubed... :wink:

the winky face makes me suspect...
i'm trying to keep up & soak up all this (new to me) PCP info...
is that sound advice?


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