Author Topic: PP700sa regulator fix (Read 20929 times))

nervoustrigger · « **Reply #40 on:** January 14, 2019, 03:09:46 AM »

Very nice, Wes, you got right to it! I'll keep my fingers crossed.

nervoustrigger · « **Reply #41 on:** January 14, 2019, 10:36:16 AM »

Oh by the way, there was still some evidence of creep right after I reassembled. Not as pronounced as before, but the first shot was landing low at 25 yards. After a couple hundred pellets, it was gone. Looks like there was a slight break in needed, I just don’t know why that is because the seat was lapped. Maybe I didn’t quite carry that step far enough.

WesBob · « **Reply #42 on:** January 15, 2019, 01:56:14 AM »

Sorry, have had a leak and trouble finding the proper oring to replace the little one that goes on the end of the threaded piece that goes into the pressure tube from the reg. Also putting the belleville in singly seems to leave me without any adjustability at higher pressure, so I switched back. Not sure what the problem was, maybe just the fact it's best not to try adjusting with very much pressure in the gun. I'm thinking now that was the problem, me being to much of a hurry and not degassing between adjustment. Anyway I've got it shooting fairly consistently in the 490's all across the pressure spectrum, but can't tell about creep very well with the leak.
Looking forward to getting it sealed up!

PlacidBlueDog · « **Reply #43 on:** January 15, 2019, 05:26:53 AM »

I'm very interested in getting the reg working on my own .25 conversion. Unregged mine doesn't hit the sweet spot until under 150bar but I don't really want more power so that's just where I've been filling it. I will try to tinker with it over the next couple days. Here's what a string from 200 bar looks like for me currently using JSB 25.95

nervoustrigger · « **Reply #44 on:** January 15, 2019, 12:25:30 PM »

Hmm, yeah I don’t know what to tell you about having difficulty adjusting the setpoint unless maybe it was near the top end of the range and the stack was squeezed almost completely flat. As you said, the reduced transfer port may require a fairly high setpoint so that would make sense.

That reminds me, I don’t really know the optimum amount to thread in that little screw that goes through the white disc. That affects how far the Bellevilles must compress before the valve seat closes. With so little travel available in the Bellevilles, I suspect it’s pretty important. Since air only needs a tiny gap to refill the plenum, I’ve been threading it almost all the way down.

Regarding the small O-ring on the stem of the regulator that threads into the air tube, I was able to use a dash size in place of the metric OEM O-ring. Going from memory, it was probably a -008 or -009. I may have jotted it in my notes. I’ll check this evening.

nervoustrigger · « **Reply #45 on:** January 15, 2019, 08:57:51 PM »

Wes, according to my notes, here's what I used on both sides of the regulator:

Code: [Select]

Regulator (to air tube): -007 90 durometer (original was metric)
Regulator (to receiver): -013 70 durometer (original was metric)

The OEM O-rings are pretty soft and didn't extrude so don't pay much attention to the 90 durometer. That's simply what I had on hand. I wouldn't hesitate to use a softer one.

WesBob · « **Reply #46 on:** January 16, 2019, 10:51:55 PM »

Thanks Jason! I found out I was trying to fix the wrong oring lol. It was the two orings on the other side that were the trouble. I had assumed it was the little one because it is the one that sees threads but I was wrong.
I spent too many hours on that gun and it was my last in 22 and was sold so I sent it out after finally getting rid of the leak. Seemed to be doing better for creep, still a little but definitely better. Dropped to the 480s after several hours on the first shot from 490s, so not perfect yet. The regulator was working well. Sorry for aborting. I wanted to get this one working perfect for the customer but the leak took up too much time.
The amount to turn in the screw in the seal is a good question. Between that and setting the belleville washers and the leak I must have taken this apart at least a dozen times lol.

nervoustrigger · « **Reply #47 on:** January 22, 2019, 06:50:46 AM »

Another quick update from the weekend...

The previous weekend, I put a couple hundred pellets through it and it seemed to be working well. So on Saturday I wanted to get back out and check to see if the changes were holding up...check for evidence of creeping in particular in case the Superglue decided to give way like the earlier epoxy job.

After sitting idle for 1 week, here were the first 5 shots at 25 yards:

Woohoo! That blew my socks off. As I was taking those 5 shots, I had no idea how they were landing. The little 4x crossbow scope on it isn't strong enough to let me see the holes in the paper. So when I walked up and saw all 5 shots produced a group that's about 0.38" CTC, I couldn't believe it. Wadcutters being lobbed 25 yards at 560fps.

Alright that's pretty sweet so I thought, hey let me see if I can ding the spinner target at 43 yards. It had a fresh coat of paint so the hits showed up nicely:

They're off center but look at the consistency of those 5 shots! That was even more surprising than the 25 yard target.

That sort of thing keeps poking me to go back to a big honkin' scope again but it looks so proportioned with the 4x.

WesBob · « **Reply #48 on:** January 22, 2019, 07:03:33 AM »

That's awesome! Looks like you've definitely fixed the creep, and have a great barrel/crown job as well!
Fun!

anti-squirrel · « **Reply #49 on:** January 22, 2019, 10:52:49 AM »

Jason, I searched a good while for a scope for mine and ended up with a Simmons 4x scope with a very thin set of crosshairs. Linky:

Fantastic shooting, by the way. I know the other SPA barrels need touching up, but the PP700 barrels seems to be great right out of the box for most.

nervoustrigger · « **Reply #50 on:** January 22, 2019, 11:34:25 AM »

Thanks Wes, I sure hope some more folks will be able to get theirs working reliably. For pesting duty, it was frustrating that I couldn’t trust the first shot so I had to restrict it to 10 yards where the creep had no meaningful effect on POI. Finally this opens up some new opportunity to extend its useful range.

Peter, thanks for your scope recommendation. I’ll look into it. The reticle on the current one is really thick so it’s hard to aim precisely. The only reason I was able to do that well on paper at 25 yards is because I was using the grid to align my aim. Unfortunately the chipmunks and house sparrows here don’t have grid lines. I’m sure there was a bit of luck involved too because normally I can’t do that well without a shoulder stock regardless of how much magnification.

FWIW, I had given the barrel some attention a while back. Cleaned up the factory crown and used JB bore paste and bore brite to smooth the bore of surface fretting. Granted I don’t know how much, if any, of an improvement it made because of how many other variables have changed in the interim.

WesBob · « **Reply #51 on:** January 22, 2019, 11:48:55 AM »

Thanks Jason, so no shoulder stock yet? It was supposed to be 5-7 days I thought. Seems like more than that now. Looking forward to you and the others getting your stocks, see how you like them. On the Canadian airgun forum, some guys have a thread, started by ~~Hobbyman2007~~ (oops, actually Leadslinger with contributions from Tazz) , on tightening up the slop on the stock and putting a rubber stopper on the side to protect the gun when folding it.
Cheers,
Wes

Hobbyman2007 · « **Reply #52 on:** January 22, 2019, 06:00:03 PM »

I don’t have a stock on either of my pistols . I am working on a brace on the bottom of the pistol grip ,similar to a slingshot . My intent is to share the weight from the front of the pistol to my forearm . Maybe that will also help with the shakes I suffer from .

WesBob · « **Reply #53 on:** January 22, 2019, 06:08:50 PM »

Cool idea! Sorry for naming you as the starter of the stock thread. I see it was Leadslinger.

I'm looking forward to getting into another creepy gun to see if the steps Jason took will cure the creep in these pistols!

Hobbyman2007 · « **Reply #54 on:** January 22, 2019, 06:47:05 PM »

Not even an issue Wes with mentioning my name , I don’t want anyone thinking I’m taking credit for their handy work . Either way I’m hoping this Reg fix is actually a fix . The .22 cal I have is accurate from fist to last shot . No Reg creep that I can see . Now the sights on the other hand , I find the front post to be a little thick . I’ve got a real simple solution for it . I’ll start another thread for that one .

WesBob · « **Reply #55 on:** January 22, 2019, 08:09:55 PM »

Sounds good!

nervoustrigger · « **Reply #56 on:** January 23, 2019, 02:06:15 AM »

Quote from: WesBob on January 22, 2019, 11:48:55 AM

...so no shoulder stock yet?

Yeah I was beginning to get concerned but it was waiting for me this evening when I got home from work. I'm impressed. Its sturdier than I expected. For those who haven't handled one, the front section that attaches to the gun is a die cast part and the back section is a rigid glass-filled nylon part. It hinges and latches together nicely. There's a tiny bit of play but nothing like the telescoping AR stocks I've seen, and it looks like I can add a couple of layers of UHMW tape and firm it right up.

My only complaint is that I shoot lefty and that puts my nose right at the hinge. Oh it's not what you think...it's not in the way. It's that pungent Harbor Freight lubricant they used on it

Haha, it's no problem at arm's length but at a quarter of an inch, I knew straight away that had to be replaced with some Superlube oil.

Overall I'm really happy with it. Lightweight, compact, sturdy, good comb height for use with the scope, and inexpensive.

WesBob · « **Reply #57 on:** January 23, 2019, 06:46:01 AM »

Glad to hear it arrived safely Jason, smell and all. ;

nervoustrigger · « **Reply #58 on:** January 26, 2019, 10:34:49 AM »

Nice start to the Saturday. I stepped out into the cold this morning to try the folding stock. Stood on the back porch and took some offhand shots at the spoon spinners at 25 yards. Literal spoons...shopmade target:

I'm not much of an offhand shot so I tried the soup spoon first. Ding! Another one...ding! Then a teaspoon...ding!

A guy has to know to stop when he's ahead.

Previously I was practicing the taco hold with it in pistol form and was lucky to hit the larger spoons 1 out of 3. I'm pretty sure precision pistol shooting was destined to be like teaching a pig to dance. So yeah the stock is just what I needed.

WesBob · « **Reply #59 on:** January 26, 2019, 11:45:33 AM »

That's great!

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PP700sa regulator fix

Author Topic: PP700sa regulator fix (Read 20929 times))